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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec...
[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 u32 ifindex;
48 u32 mark;
49 };
50
51 static DEFINE_MUTEX(inet_diag_table_mutex);
52
53 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
54 {
55 if (!inet_diag_table[proto])
56 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
57 NETLINK_SOCK_DIAG, AF_INET, proto);
58
59 mutex_lock(&inet_diag_table_mutex);
60 if (!inet_diag_table[proto])
61 return ERR_PTR(-ENOENT);
62
63 return inet_diag_table[proto];
64 }
65
66 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
67 {
68 mutex_unlock(&inet_diag_table_mutex);
69 }
70
71 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
72 {
73 r->idiag_family = sk->sk_family;
74
75 r->id.idiag_sport = htons(sk->sk_num);
76 r->id.idiag_dport = sk->sk_dport;
77 r->id.idiag_if = sk->sk_bound_dev_if;
78 sock_diag_save_cookie(sk, r->id.idiag_cookie);
79
80 #if IS_ENABLED(CONFIG_IPV6)
81 if (sk->sk_family == AF_INET6) {
82 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
83 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
84 } else
85 #endif
86 {
87 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
88 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
89
90 r->id.idiag_src[0] = sk->sk_rcv_saddr;
91 r->id.idiag_dst[0] = sk->sk_daddr;
92 }
93 }
94 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
95
96 static size_t inet_sk_attr_size(void)
97 {
98 return nla_total_size(sizeof(struct tcp_info))
99 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
100 + nla_total_size(1) /* INET_DIAG_TOS */
101 + nla_total_size(1) /* INET_DIAG_TCLASS */
102 + nla_total_size(sizeof(struct inet_diag_meminfo))
103 + nla_total_size(sizeof(struct inet_diag_msg))
104 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
105 + nla_total_size(TCP_CA_NAME_MAX)
106 + nla_total_size(sizeof(struct tcpvegas_info))
107 + 64;
108 }
109
110 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
111 struct inet_diag_msg *r, int ext,
112 struct user_namespace *user_ns)
113 {
114 const struct inet_sock *inet = inet_sk(sk);
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 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
129 if (nla_put_u8(skb, INET_DIAG_TCLASS,
130 inet6_sk(sk)->tclass) < 0)
131 goto errout;
132
133 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
134 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
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 return 0;
143 errout:
144 return 1;
145 }
146 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
147
148 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
149 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
150 struct user_namespace *user_ns,
151 u32 portid, u32 seq, u16 nlmsg_flags,
152 const struct nlmsghdr *unlh)
153 {
154 const struct tcp_congestion_ops *ca_ops;
155 const struct inet_diag_handler *handler;
156 int ext = req->idiag_ext;
157 struct inet_diag_msg *r;
158 struct nlmsghdr *nlh;
159 struct nlattr *attr;
160 void *info = NULL;
161
162 handler = inet_diag_table[req->sdiag_protocol];
163 BUG_ON(!handler);
164
165 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
166 nlmsg_flags);
167 if (!nlh)
168 return -EMSGSIZE;
169
170 r = nlmsg_data(nlh);
171 BUG_ON(!sk_fullsock(sk));
172
173 inet_diag_msg_common_fill(r, sk);
174 r->idiag_state = sk->sk_state;
175 r->idiag_timer = 0;
176 r->idiag_retrans = 0;
177
178 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns))
179 goto errout;
180
181 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
182 struct inet_diag_meminfo minfo = {
183 .idiag_rmem = sk_rmem_alloc_get(sk),
184 .idiag_wmem = sk->sk_wmem_queued,
185 .idiag_fmem = sk->sk_forward_alloc,
186 .idiag_tmem = sk_wmem_alloc_get(sk),
187 };
188
189 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
190 goto errout;
191 }
192
193 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
194 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
195 goto errout;
196
197 if (!icsk) {
198 handler->idiag_get_info(sk, r, NULL);
199 goto out;
200 }
201
202 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
203 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
204 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
205 r->idiag_timer = 1;
206 r->idiag_retrans = icsk->icsk_retransmits;
207 r->idiag_expires =
208 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
209 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
210 r->idiag_timer = 4;
211 r->idiag_retrans = icsk->icsk_probes_out;
212 r->idiag_expires =
213 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
214 } else if (timer_pending(&sk->sk_timer)) {
215 r->idiag_timer = 2;
216 r->idiag_retrans = icsk->icsk_probes_out;
217 r->idiag_expires =
218 jiffies_to_msecs(sk->sk_timer.expires - jiffies);
219 } else {
220 r->idiag_timer = 0;
221 r->idiag_expires = 0;
222 }
223
224 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
225 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
226 handler->idiag_info_size,
227 INET_DIAG_PAD);
228 if (!attr)
229 goto errout;
230
231 info = nla_data(attr);
232 }
233
234 if (ext & (1 << (INET_DIAG_CONG - 1))) {
235 int err = 0;
236
237 rcu_read_lock();
238 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
239 if (ca_ops)
240 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
241 rcu_read_unlock();
242 if (err < 0)
243 goto errout;
244 }
245
246 handler->idiag_get_info(sk, r, info);
247
248 if (sk->sk_state < TCP_TIME_WAIT) {
249 union tcp_cc_info info;
250 size_t sz = 0;
251 int attr;
252
253 rcu_read_lock();
254 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
255 if (ca_ops && ca_ops->get_info)
256 sz = ca_ops->get_info(sk, ext, &attr, &info);
257 rcu_read_unlock();
258 if (sz && nla_put(skb, attr, sz, &info) < 0)
259 goto errout;
260 }
261
262 out:
263 nlmsg_end(skb, nlh);
264 return 0;
265
266 errout:
267 nlmsg_cancel(skb, nlh);
268 return -EMSGSIZE;
269 }
270 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
271
272 static int inet_csk_diag_fill(struct sock *sk,
273 struct sk_buff *skb,
274 const struct inet_diag_req_v2 *req,
275 struct user_namespace *user_ns,
276 u32 portid, u32 seq, u16 nlmsg_flags,
277 const struct nlmsghdr *unlh)
278 {
279 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
280 user_ns, portid, seq, nlmsg_flags, unlh);
281 }
282
283 static int inet_twsk_diag_fill(struct sock *sk,
284 struct sk_buff *skb,
285 u32 portid, u32 seq, u16 nlmsg_flags,
286 const struct nlmsghdr *unlh)
287 {
288 struct inet_timewait_sock *tw = inet_twsk(sk);
289 struct inet_diag_msg *r;
290 struct nlmsghdr *nlh;
291 long tmo;
292
293 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
294 nlmsg_flags);
295 if (!nlh)
296 return -EMSGSIZE;
297
298 r = nlmsg_data(nlh);
299 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
300
301 tmo = tw->tw_timer.expires - jiffies;
302 if (tmo < 0)
303 tmo = 0;
304
305 inet_diag_msg_common_fill(r, sk);
306 r->idiag_retrans = 0;
307
308 r->idiag_state = tw->tw_substate;
309 r->idiag_timer = 3;
310 r->idiag_expires = jiffies_to_msecs(tmo);
311 r->idiag_rqueue = 0;
312 r->idiag_wqueue = 0;
313 r->idiag_uid = 0;
314 r->idiag_inode = 0;
315
316 nlmsg_end(skb, nlh);
317 return 0;
318 }
319
320 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
321 u32 portid, u32 seq, u16 nlmsg_flags,
322 const struct nlmsghdr *unlh)
323 {
324 struct inet_diag_msg *r;
325 struct nlmsghdr *nlh;
326 long tmo;
327
328 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
329 nlmsg_flags);
330 if (!nlh)
331 return -EMSGSIZE;
332
333 r = nlmsg_data(nlh);
334 inet_diag_msg_common_fill(r, sk);
335 r->idiag_state = TCP_SYN_RECV;
336 r->idiag_timer = 1;
337 r->idiag_retrans = inet_reqsk(sk)->num_retrans;
338
339 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
340 offsetof(struct sock, sk_cookie));
341
342 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
343 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
344 r->idiag_rqueue = 0;
345 r->idiag_wqueue = 0;
346 r->idiag_uid = 0;
347 r->idiag_inode = 0;
348
349 nlmsg_end(skb, nlh);
350 return 0;
351 }
352
353 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
354 const struct inet_diag_req_v2 *r,
355 struct user_namespace *user_ns,
356 u32 portid, u32 seq, u16 nlmsg_flags,
357 const struct nlmsghdr *unlh)
358 {
359 if (sk->sk_state == TCP_TIME_WAIT)
360 return inet_twsk_diag_fill(sk, skb, portid, seq,
361 nlmsg_flags, unlh);
362
363 if (sk->sk_state == TCP_NEW_SYN_RECV)
364 return inet_req_diag_fill(sk, skb, portid, seq,
365 nlmsg_flags, unlh);
366
367 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
368 nlmsg_flags, unlh);
369 }
370
371 struct sock *inet_diag_find_one_icsk(struct net *net,
372 struct inet_hashinfo *hashinfo,
373 const struct inet_diag_req_v2 *req)
374 {
375 struct sock *sk;
376
377 rcu_read_lock();
378 if (req->sdiag_family == AF_INET)
379 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
380 req->id.idiag_dport, req->id.idiag_src[0],
381 req->id.idiag_sport, req->id.idiag_if);
382 #if IS_ENABLED(CONFIG_IPV6)
383 else if (req->sdiag_family == AF_INET6) {
384 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
385 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
386 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
387 req->id.idiag_dport, req->id.idiag_src[3],
388 req->id.idiag_sport, req->id.idiag_if);
389 else
390 sk = inet6_lookup(net, hashinfo, NULL, 0,
391 (struct in6_addr *)req->id.idiag_dst,
392 req->id.idiag_dport,
393 (struct in6_addr *)req->id.idiag_src,
394 req->id.idiag_sport,
395 req->id.idiag_if);
396 }
397 #endif
398 else {
399 rcu_read_unlock();
400 return ERR_PTR(-EINVAL);
401 }
402 rcu_read_unlock();
403 if (!sk)
404 return ERR_PTR(-ENOENT);
405
406 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
407 sock_gen_put(sk);
408 return ERR_PTR(-ENOENT);
409 }
410
411 return sk;
412 }
413 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
414
415 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
416 struct sk_buff *in_skb,
417 const struct nlmsghdr *nlh,
418 const struct inet_diag_req_v2 *req)
419 {
420 struct net *net = sock_net(in_skb->sk);
421 struct sk_buff *rep;
422 struct sock *sk;
423 int err;
424
425 sk = inet_diag_find_one_icsk(net, hashinfo, req);
426 if (IS_ERR(sk))
427 return PTR_ERR(sk);
428
429 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
430 if (!rep) {
431 err = -ENOMEM;
432 goto out;
433 }
434
435 err = sk_diag_fill(sk, rep, req,
436 sk_user_ns(NETLINK_CB(in_skb).sk),
437 NETLINK_CB(in_skb).portid,
438 nlh->nlmsg_seq, 0, nlh);
439 if (err < 0) {
440 WARN_ON(err == -EMSGSIZE);
441 nlmsg_free(rep);
442 goto out;
443 }
444 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
445 MSG_DONTWAIT);
446 if (err > 0)
447 err = 0;
448
449 out:
450 if (sk)
451 sock_gen_put(sk);
452
453 return err;
454 }
455 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
456
457 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
458 const struct nlmsghdr *nlh,
459 const struct inet_diag_req_v2 *req)
460 {
461 const struct inet_diag_handler *handler;
462 int err;
463
464 handler = inet_diag_lock_handler(req->sdiag_protocol);
465 if (IS_ERR(handler))
466 err = PTR_ERR(handler);
467 else if (cmd == SOCK_DIAG_BY_FAMILY)
468 err = handler->dump_one(in_skb, nlh, req);
469 else if (cmd == SOCK_DESTROY && handler->destroy)
470 err = handler->destroy(in_skb, req);
471 else
472 err = -EOPNOTSUPP;
473 inet_diag_unlock_handler(handler);
474
475 return err;
476 }
477
478 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
479 {
480 int words = bits >> 5;
481
482 bits &= 0x1f;
483
484 if (words) {
485 if (memcmp(a1, a2, words << 2))
486 return 0;
487 }
488 if (bits) {
489 __be32 w1, w2;
490 __be32 mask;
491
492 w1 = a1[words];
493 w2 = a2[words];
494
495 mask = htonl((0xffffffff) << (32 - bits));
496
497 if ((w1 ^ w2) & mask)
498 return 0;
499 }
500
501 return 1;
502 }
503
504 static int inet_diag_bc_run(const struct nlattr *_bc,
505 const struct inet_diag_entry *entry)
506 {
507 const void *bc = nla_data(_bc);
508 int len = nla_len(_bc);
509
510 while (len > 0) {
511 int yes = 1;
512 const struct inet_diag_bc_op *op = bc;
513
514 switch (op->code) {
515 case INET_DIAG_BC_NOP:
516 break;
517 case INET_DIAG_BC_JMP:
518 yes = 0;
519 break;
520 case INET_DIAG_BC_S_GE:
521 yes = entry->sport >= op[1].no;
522 break;
523 case INET_DIAG_BC_S_LE:
524 yes = entry->sport <= op[1].no;
525 break;
526 case INET_DIAG_BC_D_GE:
527 yes = entry->dport >= op[1].no;
528 break;
529 case INET_DIAG_BC_D_LE:
530 yes = entry->dport <= op[1].no;
531 break;
532 case INET_DIAG_BC_AUTO:
533 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
534 break;
535 case INET_DIAG_BC_S_COND:
536 case INET_DIAG_BC_D_COND: {
537 const struct inet_diag_hostcond *cond;
538 const __be32 *addr;
539
540 cond = (const struct inet_diag_hostcond *)(op + 1);
541 if (cond->port != -1 &&
542 cond->port != (op->code == INET_DIAG_BC_S_COND ?
543 entry->sport : entry->dport)) {
544 yes = 0;
545 break;
546 }
547
548 if (op->code == INET_DIAG_BC_S_COND)
549 addr = entry->saddr;
550 else
551 addr = entry->daddr;
552
553 if (cond->family != AF_UNSPEC &&
554 cond->family != entry->family) {
555 if (entry->family == AF_INET6 &&
556 cond->family == AF_INET) {
557 if (addr[0] == 0 && addr[1] == 0 &&
558 addr[2] == htonl(0xffff) &&
559 bitstring_match(addr + 3,
560 cond->addr,
561 cond->prefix_len))
562 break;
563 }
564 yes = 0;
565 break;
566 }
567
568 if (cond->prefix_len == 0)
569 break;
570 if (bitstring_match(addr, cond->addr,
571 cond->prefix_len))
572 break;
573 yes = 0;
574 break;
575 }
576 case INET_DIAG_BC_DEV_COND: {
577 u32 ifindex;
578
579 ifindex = *((const u32 *)(op + 1));
580 if (ifindex != entry->ifindex)
581 yes = 0;
582 break;
583 }
584 case INET_DIAG_BC_MARK_COND: {
585 struct inet_diag_markcond *cond;
586
587 cond = (struct inet_diag_markcond *)(op + 1);
588 if ((entry->mark & cond->mask) != cond->mark)
589 yes = 0;
590 break;
591 }
592 }
593
594 if (yes) {
595 len -= op->yes;
596 bc += op->yes;
597 } else {
598 len -= op->no;
599 bc += op->no;
600 }
601 }
602 return len == 0;
603 }
604
605 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
606 */
607 static void entry_fill_addrs(struct inet_diag_entry *entry,
608 const struct sock *sk)
609 {
610 #if IS_ENABLED(CONFIG_IPV6)
611 if (sk->sk_family == AF_INET6) {
612 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
613 entry->daddr = sk->sk_v6_daddr.s6_addr32;
614 } else
615 #endif
616 {
617 entry->saddr = &sk->sk_rcv_saddr;
618 entry->daddr = &sk->sk_daddr;
619 }
620 }
621
622 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
623 {
624 struct inet_sock *inet = inet_sk(sk);
625 struct inet_diag_entry entry;
626
627 if (!bc)
628 return 1;
629
630 entry.family = sk->sk_family;
631 entry_fill_addrs(&entry, sk);
632 entry.sport = inet->inet_num;
633 entry.dport = ntohs(inet->inet_dport);
634 entry.ifindex = sk->sk_bound_dev_if;
635 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
636 if (sk_fullsock(sk))
637 entry.mark = sk->sk_mark;
638 else if (sk->sk_state == TCP_NEW_SYN_RECV)
639 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
640 else
641 entry.mark = 0;
642
643 return inet_diag_bc_run(bc, &entry);
644 }
645 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
646
647 static int valid_cc(const void *bc, int len, int cc)
648 {
649 while (len >= 0) {
650 const struct inet_diag_bc_op *op = bc;
651
652 if (cc > len)
653 return 0;
654 if (cc == len)
655 return 1;
656 if (op->yes < 4 || op->yes & 3)
657 return 0;
658 len -= op->yes;
659 bc += op->yes;
660 }
661 return 0;
662 }
663
664 /* data is u32 ifindex */
665 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
666 int *min_len)
667 {
668 /* Check ifindex space. */
669 *min_len += sizeof(u32);
670 if (len < *min_len)
671 return false;
672
673 return true;
674 }
675 /* Validate an inet_diag_hostcond. */
676 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
677 int *min_len)
678 {
679 struct inet_diag_hostcond *cond;
680 int addr_len;
681
682 /* Check hostcond space. */
683 *min_len += sizeof(struct inet_diag_hostcond);
684 if (len < *min_len)
685 return false;
686 cond = (struct inet_diag_hostcond *)(op + 1);
687
688 /* Check address family and address length. */
689 switch (cond->family) {
690 case AF_UNSPEC:
691 addr_len = 0;
692 break;
693 case AF_INET:
694 addr_len = sizeof(struct in_addr);
695 break;
696 case AF_INET6:
697 addr_len = sizeof(struct in6_addr);
698 break;
699 default:
700 return false;
701 }
702 *min_len += addr_len;
703 if (len < *min_len)
704 return false;
705
706 /* Check prefix length (in bits) vs address length (in bytes). */
707 if (cond->prefix_len > 8 * addr_len)
708 return false;
709
710 return true;
711 }
712
713 /* Validate a port comparison operator. */
714 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
715 int len, int *min_len)
716 {
717 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
718 *min_len += sizeof(struct inet_diag_bc_op);
719 if (len < *min_len)
720 return false;
721 return true;
722 }
723
724 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
725 int *min_len)
726 {
727 *min_len += sizeof(struct inet_diag_markcond);
728 return len >= *min_len;
729 }
730
731 static int inet_diag_bc_audit(const struct nlattr *attr,
732 const struct sk_buff *skb)
733 {
734 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
735 const void *bytecode, *bc;
736 int bytecode_len, len;
737
738 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
739 return -EINVAL;
740
741 bytecode = bc = nla_data(attr);
742 len = bytecode_len = nla_len(attr);
743
744 while (len > 0) {
745 int min_len = sizeof(struct inet_diag_bc_op);
746 const struct inet_diag_bc_op *op = bc;
747
748 switch (op->code) {
749 case INET_DIAG_BC_S_COND:
750 case INET_DIAG_BC_D_COND:
751 if (!valid_hostcond(bc, len, &min_len))
752 return -EINVAL;
753 break;
754 case INET_DIAG_BC_DEV_COND:
755 if (!valid_devcond(bc, len, &min_len))
756 return -EINVAL;
757 break;
758 case INET_DIAG_BC_S_GE:
759 case INET_DIAG_BC_S_LE:
760 case INET_DIAG_BC_D_GE:
761 case INET_DIAG_BC_D_LE:
762 if (!valid_port_comparison(bc, len, &min_len))
763 return -EINVAL;
764 break;
765 case INET_DIAG_BC_MARK_COND:
766 if (!net_admin)
767 return -EPERM;
768 if (!valid_markcond(bc, len, &min_len))
769 return -EINVAL;
770 break;
771 case INET_DIAG_BC_AUTO:
772 case INET_DIAG_BC_JMP:
773 case INET_DIAG_BC_NOP:
774 break;
775 default:
776 return -EINVAL;
777 }
778
779 if (op->code != INET_DIAG_BC_NOP) {
780 if (op->no < min_len || op->no > len + 4 || op->no & 3)
781 return -EINVAL;
782 if (op->no < len &&
783 !valid_cc(bytecode, bytecode_len, len - op->no))
784 return -EINVAL;
785 }
786
787 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
788 return -EINVAL;
789 bc += op->yes;
790 len -= op->yes;
791 }
792 return len == 0 ? 0 : -EINVAL;
793 }
794
795 static int inet_csk_diag_dump(struct sock *sk,
796 struct sk_buff *skb,
797 struct netlink_callback *cb,
798 const struct inet_diag_req_v2 *r,
799 const struct nlattr *bc)
800 {
801 if (!inet_diag_bc_sk(bc, sk))
802 return 0;
803
804 return inet_csk_diag_fill(sk, skb, r,
805 sk_user_ns(NETLINK_CB(cb->skb).sk),
806 NETLINK_CB(cb->skb).portid,
807 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
808 }
809
810 static void twsk_build_assert(void)
811 {
812 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
813 offsetof(struct sock, sk_family));
814
815 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
816 offsetof(struct inet_sock, inet_num));
817
818 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
819 offsetof(struct inet_sock, inet_dport));
820
821 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
822 offsetof(struct inet_sock, inet_rcv_saddr));
823
824 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
825 offsetof(struct inet_sock, inet_daddr));
826
827 #if IS_ENABLED(CONFIG_IPV6)
828 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
829 offsetof(struct sock, sk_v6_rcv_saddr));
830
831 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
832 offsetof(struct sock, sk_v6_daddr));
833 #endif
834 }
835
836 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
837 struct netlink_callback *cb,
838 const struct inet_diag_req_v2 *r, struct nlattr *bc)
839 {
840 struct net *net = sock_net(skb->sk);
841 int i, num, s_i, s_num;
842 u32 idiag_states = r->idiag_states;
843
844 if (idiag_states & TCPF_SYN_RECV)
845 idiag_states |= TCPF_NEW_SYN_RECV;
846 s_i = cb->args[1];
847 s_num = num = cb->args[2];
848
849 if (cb->args[0] == 0) {
850 if (!(idiag_states & TCPF_LISTEN))
851 goto skip_listen_ht;
852
853 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
854 struct inet_listen_hashbucket *ilb;
855 struct sock *sk;
856
857 num = 0;
858 ilb = &hashinfo->listening_hash[i];
859 spin_lock_bh(&ilb->lock);
860 sk_for_each(sk, &ilb->head) {
861 struct inet_sock *inet = inet_sk(sk);
862
863 if (!net_eq(sock_net(sk), net))
864 continue;
865
866 if (num < s_num) {
867 num++;
868 continue;
869 }
870
871 if (r->sdiag_family != AF_UNSPEC &&
872 sk->sk_family != r->sdiag_family)
873 goto next_listen;
874
875 if (r->id.idiag_sport != inet->inet_sport &&
876 r->id.idiag_sport)
877 goto next_listen;
878
879 if (r->id.idiag_dport ||
880 cb->args[3] > 0)
881 goto next_listen;
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 next_listen:
889 cb->args[3] = 0;
890 cb->args[4] = 0;
891 ++num;
892 }
893 spin_unlock_bh(&ilb->lock);
894
895 s_num = 0;
896 cb->args[3] = 0;
897 cb->args[4] = 0;
898 }
899 skip_listen_ht:
900 cb->args[0] = 1;
901 s_i = num = s_num = 0;
902 }
903
904 if (!(idiag_states & ~TCPF_LISTEN))
905 goto out;
906
907 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
908 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
909 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
910 struct hlist_nulls_node *node;
911 struct sock *sk;
912
913 num = 0;
914
915 if (hlist_nulls_empty(&head->chain))
916 continue;
917
918 if (i > s_i)
919 s_num = 0;
920
921 spin_lock_bh(lock);
922 sk_nulls_for_each(sk, node, &head->chain) {
923 int state, res;
924
925 if (!net_eq(sock_net(sk), net))
926 continue;
927 if (num < s_num)
928 goto next_normal;
929 state = (sk->sk_state == TCP_TIME_WAIT) ?
930 inet_twsk(sk)->tw_substate : sk->sk_state;
931 if (!(idiag_states & (1 << state)))
932 goto next_normal;
933 if (r->sdiag_family != AF_UNSPEC &&
934 sk->sk_family != r->sdiag_family)
935 goto next_normal;
936 if (r->id.idiag_sport != htons(sk->sk_num) &&
937 r->id.idiag_sport)
938 goto next_normal;
939 if (r->id.idiag_dport != sk->sk_dport &&
940 r->id.idiag_dport)
941 goto next_normal;
942 twsk_build_assert();
943
944 if (!inet_diag_bc_sk(bc, sk))
945 goto next_normal;
946
947 res = sk_diag_fill(sk, skb, r,
948 sk_user_ns(NETLINK_CB(cb->skb).sk),
949 NETLINK_CB(cb->skb).portid,
950 cb->nlh->nlmsg_seq, NLM_F_MULTI,
951 cb->nlh);
952 if (res < 0) {
953 spin_unlock_bh(lock);
954 goto done;
955 }
956 next_normal:
957 ++num;
958 }
959
960 spin_unlock_bh(lock);
961 cond_resched();
962 }
963
964 done:
965 cb->args[1] = i;
966 cb->args[2] = num;
967 out:
968 ;
969 }
970 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
971
972 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
973 const struct inet_diag_req_v2 *r,
974 struct nlattr *bc)
975 {
976 const struct inet_diag_handler *handler;
977 int err = 0;
978
979 handler = inet_diag_lock_handler(r->sdiag_protocol);
980 if (!IS_ERR(handler))
981 handler->dump(skb, cb, r, bc);
982 else
983 err = PTR_ERR(handler);
984 inet_diag_unlock_handler(handler);
985
986 return err ? : skb->len;
987 }
988
989 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
990 {
991 int hdrlen = sizeof(struct inet_diag_req_v2);
992 struct nlattr *bc = NULL;
993
994 if (nlmsg_attrlen(cb->nlh, hdrlen))
995 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
996
997 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
998 }
999
1000 static int inet_diag_type2proto(int type)
1001 {
1002 switch (type) {
1003 case TCPDIAG_GETSOCK:
1004 return IPPROTO_TCP;
1005 case DCCPDIAG_GETSOCK:
1006 return IPPROTO_DCCP;
1007 default:
1008 return 0;
1009 }
1010 }
1011
1012 static int inet_diag_dump_compat(struct sk_buff *skb,
1013 struct netlink_callback *cb)
1014 {
1015 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1016 int hdrlen = sizeof(struct inet_diag_req);
1017 struct inet_diag_req_v2 req;
1018 struct nlattr *bc = NULL;
1019
1020 req.sdiag_family = AF_UNSPEC; /* compatibility */
1021 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1022 req.idiag_ext = rc->idiag_ext;
1023 req.idiag_states = rc->idiag_states;
1024 req.id = rc->id;
1025
1026 if (nlmsg_attrlen(cb->nlh, hdrlen))
1027 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1028
1029 return __inet_diag_dump(skb, cb, &req, bc);
1030 }
1031
1032 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1033 const struct nlmsghdr *nlh)
1034 {
1035 struct inet_diag_req *rc = nlmsg_data(nlh);
1036 struct inet_diag_req_v2 req;
1037
1038 req.sdiag_family = rc->idiag_family;
1039 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1040 req.idiag_ext = rc->idiag_ext;
1041 req.idiag_states = rc->idiag_states;
1042 req.id = rc->id;
1043
1044 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1045 }
1046
1047 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1048 {
1049 int hdrlen = sizeof(struct inet_diag_req);
1050 struct net *net = sock_net(skb->sk);
1051
1052 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1053 nlmsg_len(nlh) < hdrlen)
1054 return -EINVAL;
1055
1056 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1057 if (nlmsg_attrlen(nlh, hdrlen)) {
1058 struct nlattr *attr;
1059 int err;
1060
1061 attr = nlmsg_find_attr(nlh, hdrlen,
1062 INET_DIAG_REQ_BYTECODE);
1063 err = inet_diag_bc_audit(attr, skb);
1064 if (err)
1065 return err;
1066 }
1067 {
1068 struct netlink_dump_control c = {
1069 .dump = inet_diag_dump_compat,
1070 };
1071 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1072 }
1073 }
1074
1075 return inet_diag_get_exact_compat(skb, nlh);
1076 }
1077
1078 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1079 {
1080 int hdrlen = sizeof(struct inet_diag_req_v2);
1081 struct net *net = sock_net(skb->sk);
1082
1083 if (nlmsg_len(h) < hdrlen)
1084 return -EINVAL;
1085
1086 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1087 h->nlmsg_flags & NLM_F_DUMP) {
1088 if (nlmsg_attrlen(h, hdrlen)) {
1089 struct nlattr *attr;
1090 int err;
1091
1092 attr = nlmsg_find_attr(h, hdrlen,
1093 INET_DIAG_REQ_BYTECODE);
1094 err = inet_diag_bc_audit(attr, skb);
1095 if (err)
1096 return err;
1097 }
1098 {
1099 struct netlink_dump_control c = {
1100 .dump = inet_diag_dump,
1101 };
1102 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1103 }
1104 }
1105
1106 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1107 }
1108
1109 static
1110 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1111 {
1112 const struct inet_diag_handler *handler;
1113 struct nlmsghdr *nlh;
1114 struct nlattr *attr;
1115 struct inet_diag_msg *r;
1116 void *info = NULL;
1117 int err = 0;
1118
1119 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1120 if (!nlh)
1121 return -ENOMEM;
1122
1123 r = nlmsg_data(nlh);
1124 memset(r, 0, sizeof(*r));
1125 inet_diag_msg_common_fill(r, sk);
1126 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1127 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1128 r->idiag_state = sk->sk_state;
1129
1130 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1131 nlmsg_cancel(skb, nlh);
1132 return err;
1133 }
1134
1135 handler = inet_diag_lock_handler(sk->sk_protocol);
1136 if (IS_ERR(handler)) {
1137 inet_diag_unlock_handler(handler);
1138 nlmsg_cancel(skb, nlh);
1139 return PTR_ERR(handler);
1140 }
1141
1142 attr = handler->idiag_info_size
1143 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1144 handler->idiag_info_size,
1145 INET_DIAG_PAD)
1146 : NULL;
1147 if (attr)
1148 info = nla_data(attr);
1149
1150 handler->idiag_get_info(sk, r, info);
1151 inet_diag_unlock_handler(handler);
1152
1153 nlmsg_end(skb, nlh);
1154 return 0;
1155 }
1156
1157 static const struct sock_diag_handler inet_diag_handler = {
1158 .family = AF_INET,
1159 .dump = inet_diag_handler_cmd,
1160 .get_info = inet_diag_handler_get_info,
1161 .destroy = inet_diag_handler_cmd,
1162 };
1163
1164 static const struct sock_diag_handler inet6_diag_handler = {
1165 .family = AF_INET6,
1166 .dump = inet_diag_handler_cmd,
1167 .get_info = inet_diag_handler_get_info,
1168 .destroy = inet_diag_handler_cmd,
1169 };
1170
1171 int inet_diag_register(const struct inet_diag_handler *h)
1172 {
1173 const __u16 type = h->idiag_type;
1174 int err = -EINVAL;
1175
1176 if (type >= IPPROTO_MAX)
1177 goto out;
1178
1179 mutex_lock(&inet_diag_table_mutex);
1180 err = -EEXIST;
1181 if (!inet_diag_table[type]) {
1182 inet_diag_table[type] = h;
1183 err = 0;
1184 }
1185 mutex_unlock(&inet_diag_table_mutex);
1186 out:
1187 return err;
1188 }
1189 EXPORT_SYMBOL_GPL(inet_diag_register);
1190
1191 void inet_diag_unregister(const struct inet_diag_handler *h)
1192 {
1193 const __u16 type = h->idiag_type;
1194
1195 if (type >= IPPROTO_MAX)
1196 return;
1197
1198 mutex_lock(&inet_diag_table_mutex);
1199 inet_diag_table[type] = NULL;
1200 mutex_unlock(&inet_diag_table_mutex);
1201 }
1202 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1203
1204 static int __init inet_diag_init(void)
1205 {
1206 const int inet_diag_table_size = (IPPROTO_MAX *
1207 sizeof(struct inet_diag_handler *));
1208 int err = -ENOMEM;
1209
1210 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1211 if (!inet_diag_table)
1212 goto out;
1213
1214 err = sock_diag_register(&inet_diag_handler);
1215 if (err)
1216 goto out_free_nl;
1217
1218 err = sock_diag_register(&inet6_diag_handler);
1219 if (err)
1220 goto out_free_inet;
1221
1222 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1223 out:
1224 return err;
1225
1226 out_free_inet:
1227 sock_diag_unregister(&inet_diag_handler);
1228 out_free_nl:
1229 kfree(inet_diag_table);
1230 goto out;
1231 }
1232
1233 static void __exit inet_diag_exit(void)
1234 {
1235 sock_diag_unregister(&inet6_diag_handler);
1236 sock_diag_unregister(&inet_diag_handler);
1237 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1238 kfree(inet_diag_table);
1239 }
1240
1241 module_init(inet_diag_init);
1242 module_exit(inet_diag_exit);
1243 MODULE_LICENSE("GPL");
1244 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1245 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
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