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net: use jiffies_to_msecs to replace EXPIRES_IN_MS in inet/sctp_diag
[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 };
48
49 static DEFINE_MUTEX(inet_diag_table_mutex);
50
51 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
52 {
53 if (!inet_diag_table[proto])
54 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
55 NETLINK_SOCK_DIAG, AF_INET, proto);
56
57 mutex_lock(&inet_diag_table_mutex);
58 if (!inet_diag_table[proto])
59 return ERR_PTR(-ENOENT);
60
61 return inet_diag_table[proto];
62 }
63
64 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
65 {
66 mutex_unlock(&inet_diag_table_mutex);
67 }
68
69 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
70 {
71 r->idiag_family = sk->sk_family;
72
73 r->id.idiag_sport = htons(sk->sk_num);
74 r->id.idiag_dport = sk->sk_dport;
75 r->id.idiag_if = sk->sk_bound_dev_if;
76 sock_diag_save_cookie(sk, r->id.idiag_cookie);
77
78 #if IS_ENABLED(CONFIG_IPV6)
79 if (sk->sk_family == AF_INET6) {
80 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
81 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
82 } else
83 #endif
84 {
85 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
86 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
87
88 r->id.idiag_src[0] = sk->sk_rcv_saddr;
89 r->id.idiag_dst[0] = sk->sk_daddr;
90 }
91 }
92 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
93
94 static size_t inet_sk_attr_size(void)
95 {
96 return nla_total_size(sizeof(struct tcp_info))
97 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
98 + nla_total_size(1) /* INET_DIAG_TOS */
99 + nla_total_size(1) /* INET_DIAG_TCLASS */
100 + nla_total_size(sizeof(struct inet_diag_meminfo))
101 + nla_total_size(sizeof(struct inet_diag_msg))
102 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
103 + nla_total_size(TCP_CA_NAME_MAX)
104 + nla_total_size(sizeof(struct tcpvegas_info))
105 + 64;
106 }
107
108 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
109 struct inet_diag_msg *r, int ext,
110 struct user_namespace *user_ns)
111 {
112 const struct inet_sock *inet = inet_sk(sk);
113
114 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
115 goto errout;
116
117 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
118 * hence this needs to be included regardless of socket family.
119 */
120 if (ext & (1 << (INET_DIAG_TOS - 1)))
121 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
122 goto errout;
123
124 #if IS_ENABLED(CONFIG_IPV6)
125 if (r->idiag_family == AF_INET6) {
126 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
127 if (nla_put_u8(skb, INET_DIAG_TCLASS,
128 inet6_sk(sk)->tclass) < 0)
129 goto errout;
130
131 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
132 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
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 return 0;
141 errout:
142 return 1;
143 }
144 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
145
146 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
147 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
148 struct user_namespace *user_ns,
149 u32 portid, u32 seq, u16 nlmsg_flags,
150 const struct nlmsghdr *unlh)
151 {
152 const struct tcp_congestion_ops *ca_ops;
153 const struct inet_diag_handler *handler;
154 int ext = req->idiag_ext;
155 struct inet_diag_msg *r;
156 struct nlmsghdr *nlh;
157 struct nlattr *attr;
158 void *info = NULL;
159
160 handler = inet_diag_table[req->sdiag_protocol];
161 BUG_ON(!handler);
162
163 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
164 nlmsg_flags);
165 if (!nlh)
166 return -EMSGSIZE;
167
168 r = nlmsg_data(nlh);
169 BUG_ON(!sk_fullsock(sk));
170
171 inet_diag_msg_common_fill(r, sk);
172 r->idiag_state = sk->sk_state;
173 r->idiag_timer = 0;
174 r->idiag_retrans = 0;
175
176 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns))
177 goto errout;
178
179 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
180 struct inet_diag_meminfo minfo = {
181 .idiag_rmem = sk_rmem_alloc_get(sk),
182 .idiag_wmem = sk->sk_wmem_queued,
183 .idiag_fmem = sk->sk_forward_alloc,
184 .idiag_tmem = sk_wmem_alloc_get(sk),
185 };
186
187 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
188 goto errout;
189 }
190
191 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
192 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
193 goto errout;
194
195 if (!icsk) {
196 handler->idiag_get_info(sk, r, NULL);
197 goto out;
198 }
199
200 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
201 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
202 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
203 r->idiag_timer = 1;
204 r->idiag_retrans = icsk->icsk_retransmits;
205 r->idiag_expires =
206 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
207 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
208 r->idiag_timer = 4;
209 r->idiag_retrans = icsk->icsk_probes_out;
210 r->idiag_expires =
211 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
212 } else if (timer_pending(&sk->sk_timer)) {
213 r->idiag_timer = 2;
214 r->idiag_retrans = icsk->icsk_probes_out;
215 r->idiag_expires =
216 jiffies_to_msecs(sk->sk_timer.expires - jiffies);
217 } else {
218 r->idiag_timer = 0;
219 r->idiag_expires = 0;
220 }
221
222 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
223 attr = nla_reserve(skb, INET_DIAG_INFO,
224 handler->idiag_info_size);
225 if (!attr)
226 goto errout;
227
228 info = nla_data(attr);
229 }
230
231 if (ext & (1 << (INET_DIAG_CONG - 1))) {
232 int err = 0;
233
234 rcu_read_lock();
235 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
236 if (ca_ops)
237 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
238 rcu_read_unlock();
239 if (err < 0)
240 goto errout;
241 }
242
243 handler->idiag_get_info(sk, r, info);
244
245 if (sk->sk_state < TCP_TIME_WAIT) {
246 union tcp_cc_info info;
247 size_t sz = 0;
248 int attr;
249
250 rcu_read_lock();
251 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
252 if (ca_ops && ca_ops->get_info)
253 sz = ca_ops->get_info(sk, ext, &attr, &info);
254 rcu_read_unlock();
255 if (sz && nla_put(skb, attr, sz, &info) < 0)
256 goto errout;
257 }
258
259 out:
260 nlmsg_end(skb, nlh);
261 return 0;
262
263 errout:
264 nlmsg_cancel(skb, nlh);
265 return -EMSGSIZE;
266 }
267 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
268
269 static int inet_csk_diag_fill(struct sock *sk,
270 struct sk_buff *skb,
271 const struct inet_diag_req_v2 *req,
272 struct user_namespace *user_ns,
273 u32 portid, u32 seq, u16 nlmsg_flags,
274 const struct nlmsghdr *unlh)
275 {
276 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
277 user_ns, portid, seq, nlmsg_flags, unlh);
278 }
279
280 static int inet_twsk_diag_fill(struct sock *sk,
281 struct sk_buff *skb,
282 u32 portid, u32 seq, u16 nlmsg_flags,
283 const struct nlmsghdr *unlh)
284 {
285 struct inet_timewait_sock *tw = inet_twsk(sk);
286 struct inet_diag_msg *r;
287 struct nlmsghdr *nlh;
288 long tmo;
289
290 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
291 nlmsg_flags);
292 if (!nlh)
293 return -EMSGSIZE;
294
295 r = nlmsg_data(nlh);
296 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
297
298 tmo = tw->tw_timer.expires - jiffies;
299 if (tmo < 0)
300 tmo = 0;
301
302 inet_diag_msg_common_fill(r, sk);
303 r->idiag_retrans = 0;
304
305 r->idiag_state = tw->tw_substate;
306 r->idiag_timer = 3;
307 r->idiag_expires = jiffies_to_msecs(tmo);
308 r->idiag_rqueue = 0;
309 r->idiag_wqueue = 0;
310 r->idiag_uid = 0;
311 r->idiag_inode = 0;
312
313 nlmsg_end(skb, nlh);
314 return 0;
315 }
316
317 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
318 u32 portid, u32 seq, u16 nlmsg_flags,
319 const struct nlmsghdr *unlh)
320 {
321 struct inet_diag_msg *r;
322 struct nlmsghdr *nlh;
323 long tmo;
324
325 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
326 nlmsg_flags);
327 if (!nlh)
328 return -EMSGSIZE;
329
330 r = nlmsg_data(nlh);
331 inet_diag_msg_common_fill(r, sk);
332 r->idiag_state = TCP_SYN_RECV;
333 r->idiag_timer = 1;
334 r->idiag_retrans = inet_reqsk(sk)->num_retrans;
335
336 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
337 offsetof(struct sock, sk_cookie));
338
339 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
340 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
341 r->idiag_rqueue = 0;
342 r->idiag_wqueue = 0;
343 r->idiag_uid = 0;
344 r->idiag_inode = 0;
345
346 nlmsg_end(skb, nlh);
347 return 0;
348 }
349
350 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
351 const struct inet_diag_req_v2 *r,
352 struct user_namespace *user_ns,
353 u32 portid, u32 seq, u16 nlmsg_flags,
354 const struct nlmsghdr *unlh)
355 {
356 if (sk->sk_state == TCP_TIME_WAIT)
357 return inet_twsk_diag_fill(sk, skb, portid, seq,
358 nlmsg_flags, unlh);
359
360 if (sk->sk_state == TCP_NEW_SYN_RECV)
361 return inet_req_diag_fill(sk, skb, portid, seq,
362 nlmsg_flags, unlh);
363
364 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
365 nlmsg_flags, unlh);
366 }
367
368 struct sock *inet_diag_find_one_icsk(struct net *net,
369 struct inet_hashinfo *hashinfo,
370 const struct inet_diag_req_v2 *req)
371 {
372 struct sock *sk;
373
374 rcu_read_lock();
375 if (req->sdiag_family == AF_INET)
376 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
377 req->id.idiag_dport, req->id.idiag_src[0],
378 req->id.idiag_sport, req->id.idiag_if);
379 #if IS_ENABLED(CONFIG_IPV6)
380 else if (req->sdiag_family == AF_INET6) {
381 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
382 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
383 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
384 req->id.idiag_dport, req->id.idiag_src[3],
385 req->id.idiag_sport, req->id.idiag_if);
386 else
387 sk = inet6_lookup(net, hashinfo, NULL, 0,
388 (struct in6_addr *)req->id.idiag_dst,
389 req->id.idiag_dport,
390 (struct in6_addr *)req->id.idiag_src,
391 req->id.idiag_sport,
392 req->id.idiag_if);
393 }
394 #endif
395 else {
396 rcu_read_unlock();
397 return ERR_PTR(-EINVAL);
398 }
399 rcu_read_unlock();
400 if (!sk)
401 return ERR_PTR(-ENOENT);
402
403 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
404 sock_gen_put(sk);
405 return ERR_PTR(-ENOENT);
406 }
407
408 return sk;
409 }
410 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
411
412 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
413 struct sk_buff *in_skb,
414 const struct nlmsghdr *nlh,
415 const struct inet_diag_req_v2 *req)
416 {
417 struct net *net = sock_net(in_skb->sk);
418 struct sk_buff *rep;
419 struct sock *sk;
420 int err;
421
422 sk = inet_diag_find_one_icsk(net, hashinfo, req);
423 if (IS_ERR(sk))
424 return PTR_ERR(sk);
425
426 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
427 if (!rep) {
428 err = -ENOMEM;
429 goto out;
430 }
431
432 err = sk_diag_fill(sk, rep, req,
433 sk_user_ns(NETLINK_CB(in_skb).sk),
434 NETLINK_CB(in_skb).portid,
435 nlh->nlmsg_seq, 0, nlh);
436 if (err < 0) {
437 WARN_ON(err == -EMSGSIZE);
438 nlmsg_free(rep);
439 goto out;
440 }
441 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
442 MSG_DONTWAIT);
443 if (err > 0)
444 err = 0;
445
446 out:
447 if (sk)
448 sock_gen_put(sk);
449
450 return err;
451 }
452 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
453
454 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
455 const struct nlmsghdr *nlh,
456 const struct inet_diag_req_v2 *req)
457 {
458 const struct inet_diag_handler *handler;
459 int err;
460
461 handler = inet_diag_lock_handler(req->sdiag_protocol);
462 if (IS_ERR(handler))
463 err = PTR_ERR(handler);
464 else if (cmd == SOCK_DIAG_BY_FAMILY)
465 err = handler->dump_one(in_skb, nlh, req);
466 else if (cmd == SOCK_DESTROY && handler->destroy)
467 err = handler->destroy(in_skb, req);
468 else
469 err = -EOPNOTSUPP;
470 inet_diag_unlock_handler(handler);
471
472 return err;
473 }
474
475 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
476 {
477 int words = bits >> 5;
478
479 bits &= 0x1f;
480
481 if (words) {
482 if (memcmp(a1, a2, words << 2))
483 return 0;
484 }
485 if (bits) {
486 __be32 w1, w2;
487 __be32 mask;
488
489 w1 = a1[words];
490 w2 = a2[words];
491
492 mask = htonl((0xffffffff) << (32 - bits));
493
494 if ((w1 ^ w2) & mask)
495 return 0;
496 }
497
498 return 1;
499 }
500
501 static int inet_diag_bc_run(const struct nlattr *_bc,
502 const struct inet_diag_entry *entry)
503 {
504 const void *bc = nla_data(_bc);
505 int len = nla_len(_bc);
506
507 while (len > 0) {
508 int yes = 1;
509 const struct inet_diag_bc_op *op = bc;
510
511 switch (op->code) {
512 case INET_DIAG_BC_NOP:
513 break;
514 case INET_DIAG_BC_JMP:
515 yes = 0;
516 break;
517 case INET_DIAG_BC_S_GE:
518 yes = entry->sport >= op[1].no;
519 break;
520 case INET_DIAG_BC_S_LE:
521 yes = entry->sport <= op[1].no;
522 break;
523 case INET_DIAG_BC_D_GE:
524 yes = entry->dport >= op[1].no;
525 break;
526 case INET_DIAG_BC_D_LE:
527 yes = entry->dport <= op[1].no;
528 break;
529 case INET_DIAG_BC_AUTO:
530 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
531 break;
532 case INET_DIAG_BC_S_COND:
533 case INET_DIAG_BC_D_COND: {
534 const struct inet_diag_hostcond *cond;
535 const __be32 *addr;
536
537 cond = (const struct inet_diag_hostcond *)(op + 1);
538 if (cond->port != -1 &&
539 cond->port != (op->code == INET_DIAG_BC_S_COND ?
540 entry->sport : entry->dport)) {
541 yes = 0;
542 break;
543 }
544
545 if (op->code == INET_DIAG_BC_S_COND)
546 addr = entry->saddr;
547 else
548 addr = entry->daddr;
549
550 if (cond->family != AF_UNSPEC &&
551 cond->family != entry->family) {
552 if (entry->family == AF_INET6 &&
553 cond->family == AF_INET) {
554 if (addr[0] == 0 && addr[1] == 0 &&
555 addr[2] == htonl(0xffff) &&
556 bitstring_match(addr + 3,
557 cond->addr,
558 cond->prefix_len))
559 break;
560 }
561 yes = 0;
562 break;
563 }
564
565 if (cond->prefix_len == 0)
566 break;
567 if (bitstring_match(addr, cond->addr,
568 cond->prefix_len))
569 break;
570 yes = 0;
571 break;
572 }
573 }
574
575 if (yes) {
576 len -= op->yes;
577 bc += op->yes;
578 } else {
579 len -= op->no;
580 bc += op->no;
581 }
582 }
583 return len == 0;
584 }
585
586 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
587 */
588 static void entry_fill_addrs(struct inet_diag_entry *entry,
589 const struct sock *sk)
590 {
591 #if IS_ENABLED(CONFIG_IPV6)
592 if (sk->sk_family == AF_INET6) {
593 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
594 entry->daddr = sk->sk_v6_daddr.s6_addr32;
595 } else
596 #endif
597 {
598 entry->saddr = &sk->sk_rcv_saddr;
599 entry->daddr = &sk->sk_daddr;
600 }
601 }
602
603 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
604 {
605 struct inet_sock *inet = inet_sk(sk);
606 struct inet_diag_entry entry;
607
608 if (!bc)
609 return 1;
610
611 entry.family = sk->sk_family;
612 entry_fill_addrs(&entry, sk);
613 entry.sport = inet->inet_num;
614 entry.dport = ntohs(inet->inet_dport);
615 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
616
617 return inet_diag_bc_run(bc, &entry);
618 }
619 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
620
621 static int valid_cc(const void *bc, int len, int cc)
622 {
623 while (len >= 0) {
624 const struct inet_diag_bc_op *op = bc;
625
626 if (cc > len)
627 return 0;
628 if (cc == len)
629 return 1;
630 if (op->yes < 4 || op->yes & 3)
631 return 0;
632 len -= op->yes;
633 bc += op->yes;
634 }
635 return 0;
636 }
637
638 /* Validate an inet_diag_hostcond. */
639 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
640 int *min_len)
641 {
642 struct inet_diag_hostcond *cond;
643 int addr_len;
644
645 /* Check hostcond space. */
646 *min_len += sizeof(struct inet_diag_hostcond);
647 if (len < *min_len)
648 return false;
649 cond = (struct inet_diag_hostcond *)(op + 1);
650
651 /* Check address family and address length. */
652 switch (cond->family) {
653 case AF_UNSPEC:
654 addr_len = 0;
655 break;
656 case AF_INET:
657 addr_len = sizeof(struct in_addr);
658 break;
659 case AF_INET6:
660 addr_len = sizeof(struct in6_addr);
661 break;
662 default:
663 return false;
664 }
665 *min_len += addr_len;
666 if (len < *min_len)
667 return false;
668
669 /* Check prefix length (in bits) vs address length (in bytes). */
670 if (cond->prefix_len > 8 * addr_len)
671 return false;
672
673 return true;
674 }
675
676 /* Validate a port comparison operator. */
677 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
678 int len, int *min_len)
679 {
680 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
681 *min_len += sizeof(struct inet_diag_bc_op);
682 if (len < *min_len)
683 return false;
684 return true;
685 }
686
687 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
688 {
689 const void *bc = bytecode;
690 int len = bytecode_len;
691
692 while (len > 0) {
693 int min_len = sizeof(struct inet_diag_bc_op);
694 const struct inet_diag_bc_op *op = bc;
695
696 switch (op->code) {
697 case INET_DIAG_BC_S_COND:
698 case INET_DIAG_BC_D_COND:
699 if (!valid_hostcond(bc, len, &min_len))
700 return -EINVAL;
701 break;
702 case INET_DIAG_BC_S_GE:
703 case INET_DIAG_BC_S_LE:
704 case INET_DIAG_BC_D_GE:
705 case INET_DIAG_BC_D_LE:
706 if (!valid_port_comparison(bc, len, &min_len))
707 return -EINVAL;
708 break;
709 case INET_DIAG_BC_AUTO:
710 case INET_DIAG_BC_JMP:
711 case INET_DIAG_BC_NOP:
712 break;
713 default:
714 return -EINVAL;
715 }
716
717 if (op->code != INET_DIAG_BC_NOP) {
718 if (op->no < min_len || op->no > len + 4 || op->no & 3)
719 return -EINVAL;
720 if (op->no < len &&
721 !valid_cc(bytecode, bytecode_len, len - op->no))
722 return -EINVAL;
723 }
724
725 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
726 return -EINVAL;
727 bc += op->yes;
728 len -= op->yes;
729 }
730 return len == 0 ? 0 : -EINVAL;
731 }
732
733 static int inet_csk_diag_dump(struct sock *sk,
734 struct sk_buff *skb,
735 struct netlink_callback *cb,
736 const struct inet_diag_req_v2 *r,
737 const struct nlattr *bc)
738 {
739 if (!inet_diag_bc_sk(bc, sk))
740 return 0;
741
742 return inet_csk_diag_fill(sk, skb, r,
743 sk_user_ns(NETLINK_CB(cb->skb).sk),
744 NETLINK_CB(cb->skb).portid,
745 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
746 }
747
748 static void twsk_build_assert(void)
749 {
750 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
751 offsetof(struct sock, sk_family));
752
753 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
754 offsetof(struct inet_sock, inet_num));
755
756 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
757 offsetof(struct inet_sock, inet_dport));
758
759 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
760 offsetof(struct inet_sock, inet_rcv_saddr));
761
762 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
763 offsetof(struct inet_sock, inet_daddr));
764
765 #if IS_ENABLED(CONFIG_IPV6)
766 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
767 offsetof(struct sock, sk_v6_rcv_saddr));
768
769 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
770 offsetof(struct sock, sk_v6_daddr));
771 #endif
772 }
773
774 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
775 struct netlink_callback *cb,
776 const struct inet_diag_req_v2 *r, struct nlattr *bc)
777 {
778 struct net *net = sock_net(skb->sk);
779 int i, num, s_i, s_num;
780 u32 idiag_states = r->idiag_states;
781
782 if (idiag_states & TCPF_SYN_RECV)
783 idiag_states |= TCPF_NEW_SYN_RECV;
784 s_i = cb->args[1];
785 s_num = num = cb->args[2];
786
787 if (cb->args[0] == 0) {
788 if (!(idiag_states & TCPF_LISTEN))
789 goto skip_listen_ht;
790
791 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
792 struct inet_listen_hashbucket *ilb;
793 struct sock *sk;
794
795 num = 0;
796 ilb = &hashinfo->listening_hash[i];
797 spin_lock_bh(&ilb->lock);
798 sk_for_each(sk, &ilb->head) {
799 struct inet_sock *inet = inet_sk(sk);
800
801 if (!net_eq(sock_net(sk), net))
802 continue;
803
804 if (num < s_num) {
805 num++;
806 continue;
807 }
808
809 if (r->sdiag_family != AF_UNSPEC &&
810 sk->sk_family != r->sdiag_family)
811 goto next_listen;
812
813 if (r->id.idiag_sport != inet->inet_sport &&
814 r->id.idiag_sport)
815 goto next_listen;
816
817 if (r->id.idiag_dport ||
818 cb->args[3] > 0)
819 goto next_listen;
820
821 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
822 spin_unlock_bh(&ilb->lock);
823 goto done;
824 }
825
826 next_listen:
827 cb->args[3] = 0;
828 cb->args[4] = 0;
829 ++num;
830 }
831 spin_unlock_bh(&ilb->lock);
832
833 s_num = 0;
834 cb->args[3] = 0;
835 cb->args[4] = 0;
836 }
837 skip_listen_ht:
838 cb->args[0] = 1;
839 s_i = num = s_num = 0;
840 }
841
842 if (!(idiag_states & ~TCPF_LISTEN))
843 goto out;
844
845 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
846 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
847 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
848 struct hlist_nulls_node *node;
849 struct sock *sk;
850
851 num = 0;
852
853 if (hlist_nulls_empty(&head->chain))
854 continue;
855
856 if (i > s_i)
857 s_num = 0;
858
859 spin_lock_bh(lock);
860 sk_nulls_for_each(sk, node, &head->chain) {
861 int state, res;
862
863 if (!net_eq(sock_net(sk), net))
864 continue;
865 if (num < s_num)
866 goto next_normal;
867 state = (sk->sk_state == TCP_TIME_WAIT) ?
868 inet_twsk(sk)->tw_substate : sk->sk_state;
869 if (!(idiag_states & (1 << state)))
870 goto next_normal;
871 if (r->sdiag_family != AF_UNSPEC &&
872 sk->sk_family != r->sdiag_family)
873 goto next_normal;
874 if (r->id.idiag_sport != htons(sk->sk_num) &&
875 r->id.idiag_sport)
876 goto next_normal;
877 if (r->id.idiag_dport != sk->sk_dport &&
878 r->id.idiag_dport)
879 goto next_normal;
880 twsk_build_assert();
881
882 if (!inet_diag_bc_sk(bc, sk))
883 goto next_normal;
884
885 res = sk_diag_fill(sk, skb, r,
886 sk_user_ns(NETLINK_CB(cb->skb).sk),
887 NETLINK_CB(cb->skb).portid,
888 cb->nlh->nlmsg_seq, NLM_F_MULTI,
889 cb->nlh);
890 if (res < 0) {
891 spin_unlock_bh(lock);
892 goto done;
893 }
894 next_normal:
895 ++num;
896 }
897
898 spin_unlock_bh(lock);
899 cond_resched();
900 }
901
902 done:
903 cb->args[1] = i;
904 cb->args[2] = num;
905 out:
906 ;
907 }
908 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
909
910 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
911 const struct inet_diag_req_v2 *r,
912 struct nlattr *bc)
913 {
914 const struct inet_diag_handler *handler;
915 int err = 0;
916
917 handler = inet_diag_lock_handler(r->sdiag_protocol);
918 if (!IS_ERR(handler))
919 handler->dump(skb, cb, r, bc);
920 else
921 err = PTR_ERR(handler);
922 inet_diag_unlock_handler(handler);
923
924 return err ? : skb->len;
925 }
926
927 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
928 {
929 int hdrlen = sizeof(struct inet_diag_req_v2);
930 struct nlattr *bc = NULL;
931
932 if (nlmsg_attrlen(cb->nlh, hdrlen))
933 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
934
935 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
936 }
937
938 static int inet_diag_type2proto(int type)
939 {
940 switch (type) {
941 case TCPDIAG_GETSOCK:
942 return IPPROTO_TCP;
943 case DCCPDIAG_GETSOCK:
944 return IPPROTO_DCCP;
945 default:
946 return 0;
947 }
948 }
949
950 static int inet_diag_dump_compat(struct sk_buff *skb,
951 struct netlink_callback *cb)
952 {
953 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
954 int hdrlen = sizeof(struct inet_diag_req);
955 struct inet_diag_req_v2 req;
956 struct nlattr *bc = NULL;
957
958 req.sdiag_family = AF_UNSPEC; /* compatibility */
959 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
960 req.idiag_ext = rc->idiag_ext;
961 req.idiag_states = rc->idiag_states;
962 req.id = rc->id;
963
964 if (nlmsg_attrlen(cb->nlh, hdrlen))
965 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
966
967 return __inet_diag_dump(skb, cb, &req, bc);
968 }
969
970 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
971 const struct nlmsghdr *nlh)
972 {
973 struct inet_diag_req *rc = nlmsg_data(nlh);
974 struct inet_diag_req_v2 req;
975
976 req.sdiag_family = rc->idiag_family;
977 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
978 req.idiag_ext = rc->idiag_ext;
979 req.idiag_states = rc->idiag_states;
980 req.id = rc->id;
981
982 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
983 }
984
985 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
986 {
987 int hdrlen = sizeof(struct inet_diag_req);
988 struct net *net = sock_net(skb->sk);
989
990 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
991 nlmsg_len(nlh) < hdrlen)
992 return -EINVAL;
993
994 if (nlh->nlmsg_flags & NLM_F_DUMP) {
995 if (nlmsg_attrlen(nlh, hdrlen)) {
996 struct nlattr *attr;
997
998 attr = nlmsg_find_attr(nlh, hdrlen,
999 INET_DIAG_REQ_BYTECODE);
1000 if (!attr ||
1001 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1002 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1003 return -EINVAL;
1004 }
1005 {
1006 struct netlink_dump_control c = {
1007 .dump = inet_diag_dump_compat,
1008 };
1009 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1010 }
1011 }
1012
1013 return inet_diag_get_exact_compat(skb, nlh);
1014 }
1015
1016 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1017 {
1018 int hdrlen = sizeof(struct inet_diag_req_v2);
1019 struct net *net = sock_net(skb->sk);
1020
1021 if (nlmsg_len(h) < hdrlen)
1022 return -EINVAL;
1023
1024 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1025 h->nlmsg_flags & NLM_F_DUMP) {
1026 if (nlmsg_attrlen(h, hdrlen)) {
1027 struct nlattr *attr;
1028
1029 attr = nlmsg_find_attr(h, hdrlen,
1030 INET_DIAG_REQ_BYTECODE);
1031 if (!attr ||
1032 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1033 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1034 return -EINVAL;
1035 }
1036 {
1037 struct netlink_dump_control c = {
1038 .dump = inet_diag_dump,
1039 };
1040 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1041 }
1042 }
1043
1044 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1045 }
1046
1047 static
1048 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1049 {
1050 const struct inet_diag_handler *handler;
1051 struct nlmsghdr *nlh;
1052 struct nlattr *attr;
1053 struct inet_diag_msg *r;
1054 void *info = NULL;
1055 int err = 0;
1056
1057 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1058 if (!nlh)
1059 return -ENOMEM;
1060
1061 r = nlmsg_data(nlh);
1062 memset(r, 0, sizeof(*r));
1063 inet_diag_msg_common_fill(r, sk);
1064 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1065 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1066 r->idiag_state = sk->sk_state;
1067
1068 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1069 nlmsg_cancel(skb, nlh);
1070 return err;
1071 }
1072
1073 handler = inet_diag_lock_handler(sk->sk_protocol);
1074 if (IS_ERR(handler)) {
1075 inet_diag_unlock_handler(handler);
1076 nlmsg_cancel(skb, nlh);
1077 return PTR_ERR(handler);
1078 }
1079
1080 attr = handler->idiag_info_size
1081 ? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size)
1082 : NULL;
1083 if (attr)
1084 info = nla_data(attr);
1085
1086 handler->idiag_get_info(sk, r, info);
1087 inet_diag_unlock_handler(handler);
1088
1089 nlmsg_end(skb, nlh);
1090 return 0;
1091 }
1092
1093 static const struct sock_diag_handler inet_diag_handler = {
1094 .family = AF_INET,
1095 .dump = inet_diag_handler_cmd,
1096 .get_info = inet_diag_handler_get_info,
1097 .destroy = inet_diag_handler_cmd,
1098 };
1099
1100 static const struct sock_diag_handler inet6_diag_handler = {
1101 .family = AF_INET6,
1102 .dump = inet_diag_handler_cmd,
1103 .get_info = inet_diag_handler_get_info,
1104 .destroy = inet_diag_handler_cmd,
1105 };
1106
1107 int inet_diag_register(const struct inet_diag_handler *h)
1108 {
1109 const __u16 type = h->idiag_type;
1110 int err = -EINVAL;
1111
1112 if (type >= IPPROTO_MAX)
1113 goto out;
1114
1115 mutex_lock(&inet_diag_table_mutex);
1116 err = -EEXIST;
1117 if (!inet_diag_table[type]) {
1118 inet_diag_table[type] = h;
1119 err = 0;
1120 }
1121 mutex_unlock(&inet_diag_table_mutex);
1122 out:
1123 return err;
1124 }
1125 EXPORT_SYMBOL_GPL(inet_diag_register);
1126
1127 void inet_diag_unregister(const struct inet_diag_handler *h)
1128 {
1129 const __u16 type = h->idiag_type;
1130
1131 if (type >= IPPROTO_MAX)
1132 return;
1133
1134 mutex_lock(&inet_diag_table_mutex);
1135 inet_diag_table[type] = NULL;
1136 mutex_unlock(&inet_diag_table_mutex);
1137 }
1138 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1139
1140 static int __init inet_diag_init(void)
1141 {
1142 const int inet_diag_table_size = (IPPROTO_MAX *
1143 sizeof(struct inet_diag_handler *));
1144 int err = -ENOMEM;
1145
1146 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1147 if (!inet_diag_table)
1148 goto out;
1149
1150 err = sock_diag_register(&inet_diag_handler);
1151 if (err)
1152 goto out_free_nl;
1153
1154 err = sock_diag_register(&inet6_diag_handler);
1155 if (err)
1156 goto out_free_inet;
1157
1158 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1159 out:
1160 return err;
1161
1162 out_free_inet:
1163 sock_diag_unregister(&inet_diag_handler);
1164 out_free_nl:
1165 kfree(inet_diag_table);
1166 goto out;
1167 }
1168
1169 static void __exit inet_diag_exit(void)
1170 {
1171 sock_diag_unregister(&inet6_diag_handler);
1172 sock_diag_unregister(&inet_diag_handler);
1173 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1174 kfree(inet_diag_table);
1175 }
1176
1177 module_init(inet_diag_init);
1178 module_exit(inet_diag_exit);
1179 MODULE_LICENSE("GPL");
1180 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1181 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
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