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Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf
[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_64bit(skb, INET_DIAG_INFO,
224 handler->idiag_info_size,
225 INET_DIAG_PAD);
226 if (!attr)
227 goto errout;
228
229 info = nla_data(attr);
230 }
231
232 if (ext & (1 << (INET_DIAG_CONG - 1))) {
233 int err = 0;
234
235 rcu_read_lock();
236 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
237 if (ca_ops)
238 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
239 rcu_read_unlock();
240 if (err < 0)
241 goto errout;
242 }
243
244 handler->idiag_get_info(sk, r, info);
245
246 if (sk->sk_state < TCP_TIME_WAIT) {
247 union tcp_cc_info info;
248 size_t sz = 0;
249 int attr;
250
251 rcu_read_lock();
252 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
253 if (ca_ops && ca_ops->get_info)
254 sz = ca_ops->get_info(sk, ext, &attr, &info);
255 rcu_read_unlock();
256 if (sz && nla_put(skb, attr, sz, &info) < 0)
257 goto errout;
258 }
259
260 out:
261 nlmsg_end(skb, nlh);
262 return 0;
263
264 errout:
265 nlmsg_cancel(skb, nlh);
266 return -EMSGSIZE;
267 }
268 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
269
270 static int inet_csk_diag_fill(struct sock *sk,
271 struct sk_buff *skb,
272 const struct inet_diag_req_v2 *req,
273 struct user_namespace *user_ns,
274 u32 portid, u32 seq, u16 nlmsg_flags,
275 const struct nlmsghdr *unlh)
276 {
277 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
278 user_ns, portid, seq, nlmsg_flags, unlh);
279 }
280
281 static int inet_twsk_diag_fill(struct sock *sk,
282 struct sk_buff *skb,
283 u32 portid, u32 seq, u16 nlmsg_flags,
284 const struct nlmsghdr *unlh)
285 {
286 struct inet_timewait_sock *tw = inet_twsk(sk);
287 struct inet_diag_msg *r;
288 struct nlmsghdr *nlh;
289 long tmo;
290
291 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
292 nlmsg_flags);
293 if (!nlh)
294 return -EMSGSIZE;
295
296 r = nlmsg_data(nlh);
297 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
298
299 tmo = tw->tw_timer.expires - jiffies;
300 if (tmo < 0)
301 tmo = 0;
302
303 inet_diag_msg_common_fill(r, sk);
304 r->idiag_retrans = 0;
305
306 r->idiag_state = tw->tw_substate;
307 r->idiag_timer = 3;
308 r->idiag_expires = jiffies_to_msecs(tmo);
309 r->idiag_rqueue = 0;
310 r->idiag_wqueue = 0;
311 r->idiag_uid = 0;
312 r->idiag_inode = 0;
313
314 nlmsg_end(skb, nlh);
315 return 0;
316 }
317
318 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
319 u32 portid, u32 seq, u16 nlmsg_flags,
320 const struct nlmsghdr *unlh)
321 {
322 struct inet_diag_msg *r;
323 struct nlmsghdr *nlh;
324 long tmo;
325
326 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
327 nlmsg_flags);
328 if (!nlh)
329 return -EMSGSIZE;
330
331 r = nlmsg_data(nlh);
332 inet_diag_msg_common_fill(r, sk);
333 r->idiag_state = TCP_SYN_RECV;
334 r->idiag_timer = 1;
335 r->idiag_retrans = inet_reqsk(sk)->num_retrans;
336
337 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
338 offsetof(struct sock, sk_cookie));
339
340 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
341 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
342 r->idiag_rqueue = 0;
343 r->idiag_wqueue = 0;
344 r->idiag_uid = 0;
345 r->idiag_inode = 0;
346
347 nlmsg_end(skb, nlh);
348 return 0;
349 }
350
351 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
352 const struct inet_diag_req_v2 *r,
353 struct user_namespace *user_ns,
354 u32 portid, u32 seq, u16 nlmsg_flags,
355 const struct nlmsghdr *unlh)
356 {
357 if (sk->sk_state == TCP_TIME_WAIT)
358 return inet_twsk_diag_fill(sk, skb, portid, seq,
359 nlmsg_flags, unlh);
360
361 if (sk->sk_state == TCP_NEW_SYN_RECV)
362 return inet_req_diag_fill(sk, skb, portid, seq,
363 nlmsg_flags, unlh);
364
365 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
366 nlmsg_flags, unlh);
367 }
368
369 struct sock *inet_diag_find_one_icsk(struct net *net,
370 struct inet_hashinfo *hashinfo,
371 const struct inet_diag_req_v2 *req)
372 {
373 struct sock *sk;
374
375 rcu_read_lock();
376 if (req->sdiag_family == AF_INET)
377 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
378 req->id.idiag_dport, req->id.idiag_src[0],
379 req->id.idiag_sport, req->id.idiag_if);
380 #if IS_ENABLED(CONFIG_IPV6)
381 else if (req->sdiag_family == AF_INET6) {
382 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
383 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
384 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
385 req->id.idiag_dport, req->id.idiag_src[3],
386 req->id.idiag_sport, req->id.idiag_if);
387 else
388 sk = inet6_lookup(net, hashinfo, NULL, 0,
389 (struct in6_addr *)req->id.idiag_dst,
390 req->id.idiag_dport,
391 (struct in6_addr *)req->id.idiag_src,
392 req->id.idiag_sport,
393 req->id.idiag_if);
394 }
395 #endif
396 else {
397 rcu_read_unlock();
398 return ERR_PTR(-EINVAL);
399 }
400 rcu_read_unlock();
401 if (!sk)
402 return ERR_PTR(-ENOENT);
403
404 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
405 sock_gen_put(sk);
406 return ERR_PTR(-ENOENT);
407 }
408
409 return sk;
410 }
411 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
412
413 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
414 struct sk_buff *in_skb,
415 const struct nlmsghdr *nlh,
416 const struct inet_diag_req_v2 *req)
417 {
418 struct net *net = sock_net(in_skb->sk);
419 struct sk_buff *rep;
420 struct sock *sk;
421 int err;
422
423 sk = inet_diag_find_one_icsk(net, hashinfo, req);
424 if (IS_ERR(sk))
425 return PTR_ERR(sk);
426
427 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
428 if (!rep) {
429 err = -ENOMEM;
430 goto out;
431 }
432
433 err = sk_diag_fill(sk, rep, req,
434 sk_user_ns(NETLINK_CB(in_skb).sk),
435 NETLINK_CB(in_skb).portid,
436 nlh->nlmsg_seq, 0, nlh);
437 if (err < 0) {
438 WARN_ON(err == -EMSGSIZE);
439 nlmsg_free(rep);
440 goto out;
441 }
442 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
443 MSG_DONTWAIT);
444 if (err > 0)
445 err = 0;
446
447 out:
448 if (sk)
449 sock_gen_put(sk);
450
451 return err;
452 }
453 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
454
455 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
456 const struct nlmsghdr *nlh,
457 const struct inet_diag_req_v2 *req)
458 {
459 const struct inet_diag_handler *handler;
460 int err;
461
462 handler = inet_diag_lock_handler(req->sdiag_protocol);
463 if (IS_ERR(handler))
464 err = PTR_ERR(handler);
465 else if (cmd == SOCK_DIAG_BY_FAMILY)
466 err = handler->dump_one(in_skb, nlh, req);
467 else if (cmd == SOCK_DESTROY && handler->destroy)
468 err = handler->destroy(in_skb, req);
469 else
470 err = -EOPNOTSUPP;
471 inet_diag_unlock_handler(handler);
472
473 return err;
474 }
475
476 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
477 {
478 int words = bits >> 5;
479
480 bits &= 0x1f;
481
482 if (words) {
483 if (memcmp(a1, a2, words << 2))
484 return 0;
485 }
486 if (bits) {
487 __be32 w1, w2;
488 __be32 mask;
489
490 w1 = a1[words];
491 w2 = a2[words];
492
493 mask = htonl((0xffffffff) << (32 - bits));
494
495 if ((w1 ^ w2) & mask)
496 return 0;
497 }
498
499 return 1;
500 }
501
502 static int inet_diag_bc_run(const struct nlattr *_bc,
503 const struct inet_diag_entry *entry)
504 {
505 const void *bc = nla_data(_bc);
506 int len = nla_len(_bc);
507
508 while (len > 0) {
509 int yes = 1;
510 const struct inet_diag_bc_op *op = bc;
511
512 switch (op->code) {
513 case INET_DIAG_BC_NOP:
514 break;
515 case INET_DIAG_BC_JMP:
516 yes = 0;
517 break;
518 case INET_DIAG_BC_S_GE:
519 yes = entry->sport >= op[1].no;
520 break;
521 case INET_DIAG_BC_S_LE:
522 yes = entry->sport <= op[1].no;
523 break;
524 case INET_DIAG_BC_D_GE:
525 yes = entry->dport >= op[1].no;
526 break;
527 case INET_DIAG_BC_D_LE:
528 yes = entry->dport <= op[1].no;
529 break;
530 case INET_DIAG_BC_AUTO:
531 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
532 break;
533 case INET_DIAG_BC_S_COND:
534 case INET_DIAG_BC_D_COND: {
535 const struct inet_diag_hostcond *cond;
536 const __be32 *addr;
537
538 cond = (const struct inet_diag_hostcond *)(op + 1);
539 if (cond->port != -1 &&
540 cond->port != (op->code == INET_DIAG_BC_S_COND ?
541 entry->sport : entry->dport)) {
542 yes = 0;
543 break;
544 }
545
546 if (op->code == INET_DIAG_BC_S_COND)
547 addr = entry->saddr;
548 else
549 addr = entry->daddr;
550
551 if (cond->family != AF_UNSPEC &&
552 cond->family != entry->family) {
553 if (entry->family == AF_INET6 &&
554 cond->family == AF_INET) {
555 if (addr[0] == 0 && addr[1] == 0 &&
556 addr[2] == htonl(0xffff) &&
557 bitstring_match(addr + 3,
558 cond->addr,
559 cond->prefix_len))
560 break;
561 }
562 yes = 0;
563 break;
564 }
565
566 if (cond->prefix_len == 0)
567 break;
568 if (bitstring_match(addr, cond->addr,
569 cond->prefix_len))
570 break;
571 yes = 0;
572 break;
573 }
574 }
575
576 if (yes) {
577 len -= op->yes;
578 bc += op->yes;
579 } else {
580 len -= op->no;
581 bc += op->no;
582 }
583 }
584 return len == 0;
585 }
586
587 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
588 */
589 static void entry_fill_addrs(struct inet_diag_entry *entry,
590 const struct sock *sk)
591 {
592 #if IS_ENABLED(CONFIG_IPV6)
593 if (sk->sk_family == AF_INET6) {
594 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
595 entry->daddr = sk->sk_v6_daddr.s6_addr32;
596 } else
597 #endif
598 {
599 entry->saddr = &sk->sk_rcv_saddr;
600 entry->daddr = &sk->sk_daddr;
601 }
602 }
603
604 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
605 {
606 struct inet_sock *inet = inet_sk(sk);
607 struct inet_diag_entry entry;
608
609 if (!bc)
610 return 1;
611
612 entry.family = sk->sk_family;
613 entry_fill_addrs(&entry, sk);
614 entry.sport = inet->inet_num;
615 entry.dport = ntohs(inet->inet_dport);
616 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
617
618 return inet_diag_bc_run(bc, &entry);
619 }
620 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
621
622 static int valid_cc(const void *bc, int len, int cc)
623 {
624 while (len >= 0) {
625 const struct inet_diag_bc_op *op = bc;
626
627 if (cc > len)
628 return 0;
629 if (cc == len)
630 return 1;
631 if (op->yes < 4 || op->yes & 3)
632 return 0;
633 len -= op->yes;
634 bc += op->yes;
635 }
636 return 0;
637 }
638
639 /* Validate an inet_diag_hostcond. */
640 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
641 int *min_len)
642 {
643 struct inet_diag_hostcond *cond;
644 int addr_len;
645
646 /* Check hostcond space. */
647 *min_len += sizeof(struct inet_diag_hostcond);
648 if (len < *min_len)
649 return false;
650 cond = (struct inet_diag_hostcond *)(op + 1);
651
652 /* Check address family and address length. */
653 switch (cond->family) {
654 case AF_UNSPEC:
655 addr_len = 0;
656 break;
657 case AF_INET:
658 addr_len = sizeof(struct in_addr);
659 break;
660 case AF_INET6:
661 addr_len = sizeof(struct in6_addr);
662 break;
663 default:
664 return false;
665 }
666 *min_len += addr_len;
667 if (len < *min_len)
668 return false;
669
670 /* Check prefix length (in bits) vs address length (in bytes). */
671 if (cond->prefix_len > 8 * addr_len)
672 return false;
673
674 return true;
675 }
676
677 /* Validate a port comparison operator. */
678 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
679 int len, int *min_len)
680 {
681 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
682 *min_len += sizeof(struct inet_diag_bc_op);
683 if (len < *min_len)
684 return false;
685 return true;
686 }
687
688 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
689 {
690 const void *bc = bytecode;
691 int len = bytecode_len;
692
693 while (len > 0) {
694 int min_len = sizeof(struct inet_diag_bc_op);
695 const struct inet_diag_bc_op *op = bc;
696
697 switch (op->code) {
698 case INET_DIAG_BC_S_COND:
699 case INET_DIAG_BC_D_COND:
700 if (!valid_hostcond(bc, len, &min_len))
701 return -EINVAL;
702 break;
703 case INET_DIAG_BC_S_GE:
704 case INET_DIAG_BC_S_LE:
705 case INET_DIAG_BC_D_GE:
706 case INET_DIAG_BC_D_LE:
707 if (!valid_port_comparison(bc, len, &min_len))
708 return -EINVAL;
709 break;
710 case INET_DIAG_BC_AUTO:
711 case INET_DIAG_BC_JMP:
712 case INET_DIAG_BC_NOP:
713 break;
714 default:
715 return -EINVAL;
716 }
717
718 if (op->code != INET_DIAG_BC_NOP) {
719 if (op->no < min_len || op->no > len + 4 || op->no & 3)
720 return -EINVAL;
721 if (op->no < len &&
722 !valid_cc(bytecode, bytecode_len, len - op->no))
723 return -EINVAL;
724 }
725
726 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
727 return -EINVAL;
728 bc += op->yes;
729 len -= op->yes;
730 }
731 return len == 0 ? 0 : -EINVAL;
732 }
733
734 static int inet_csk_diag_dump(struct sock *sk,
735 struct sk_buff *skb,
736 struct netlink_callback *cb,
737 const struct inet_diag_req_v2 *r,
738 const struct nlattr *bc)
739 {
740 if (!inet_diag_bc_sk(bc, sk))
741 return 0;
742
743 return inet_csk_diag_fill(sk, skb, r,
744 sk_user_ns(NETLINK_CB(cb->skb).sk),
745 NETLINK_CB(cb->skb).portid,
746 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
747 }
748
749 static void twsk_build_assert(void)
750 {
751 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
752 offsetof(struct sock, sk_family));
753
754 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
755 offsetof(struct inet_sock, inet_num));
756
757 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
758 offsetof(struct inet_sock, inet_dport));
759
760 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
761 offsetof(struct inet_sock, inet_rcv_saddr));
762
763 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
764 offsetof(struct inet_sock, inet_daddr));
765
766 #if IS_ENABLED(CONFIG_IPV6)
767 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
768 offsetof(struct sock, sk_v6_rcv_saddr));
769
770 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
771 offsetof(struct sock, sk_v6_daddr));
772 #endif
773 }
774
775 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
776 struct netlink_callback *cb,
777 const struct inet_diag_req_v2 *r, struct nlattr *bc)
778 {
779 struct net *net = sock_net(skb->sk);
780 int i, num, s_i, s_num;
781 u32 idiag_states = r->idiag_states;
782
783 if (idiag_states & TCPF_SYN_RECV)
784 idiag_states |= TCPF_NEW_SYN_RECV;
785 s_i = cb->args[1];
786 s_num = num = cb->args[2];
787
788 if (cb->args[0] == 0) {
789 if (!(idiag_states & TCPF_LISTEN))
790 goto skip_listen_ht;
791
792 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
793 struct inet_listen_hashbucket *ilb;
794 struct sock *sk;
795
796 num = 0;
797 ilb = &hashinfo->listening_hash[i];
798 spin_lock_bh(&ilb->lock);
799 sk_for_each(sk, &ilb->head) {
800 struct inet_sock *inet = inet_sk(sk);
801
802 if (!net_eq(sock_net(sk), net))
803 continue;
804
805 if (num < s_num) {
806 num++;
807 continue;
808 }
809
810 if (r->sdiag_family != AF_UNSPEC &&
811 sk->sk_family != r->sdiag_family)
812 goto next_listen;
813
814 if (r->id.idiag_sport != inet->inet_sport &&
815 r->id.idiag_sport)
816 goto next_listen;
817
818 if (r->id.idiag_dport ||
819 cb->args[3] > 0)
820 goto next_listen;
821
822 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
823 spin_unlock_bh(&ilb->lock);
824 goto done;
825 }
826
827 next_listen:
828 cb->args[3] = 0;
829 cb->args[4] = 0;
830 ++num;
831 }
832 spin_unlock_bh(&ilb->lock);
833
834 s_num = 0;
835 cb->args[3] = 0;
836 cb->args[4] = 0;
837 }
838 skip_listen_ht:
839 cb->args[0] = 1;
840 s_i = num = s_num = 0;
841 }
842
843 if (!(idiag_states & ~TCPF_LISTEN))
844 goto out;
845
846 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
847 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
848 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
849 struct hlist_nulls_node *node;
850 struct sock *sk;
851
852 num = 0;
853
854 if (hlist_nulls_empty(&head->chain))
855 continue;
856
857 if (i > s_i)
858 s_num = 0;
859
860 spin_lock_bh(lock);
861 sk_nulls_for_each(sk, node, &head->chain) {
862 int state, res;
863
864 if (!net_eq(sock_net(sk), net))
865 continue;
866 if (num < s_num)
867 goto next_normal;
868 state = (sk->sk_state == TCP_TIME_WAIT) ?
869 inet_twsk(sk)->tw_substate : sk->sk_state;
870 if (!(idiag_states & (1 << state)))
871 goto next_normal;
872 if (r->sdiag_family != AF_UNSPEC &&
873 sk->sk_family != r->sdiag_family)
874 goto next_normal;
875 if (r->id.idiag_sport != htons(sk->sk_num) &&
876 r->id.idiag_sport)
877 goto next_normal;
878 if (r->id.idiag_dport != sk->sk_dport &&
879 r->id.idiag_dport)
880 goto next_normal;
881 twsk_build_assert();
882
883 if (!inet_diag_bc_sk(bc, sk))
884 goto next_normal;
885
886 res = sk_diag_fill(sk, skb, r,
887 sk_user_ns(NETLINK_CB(cb->skb).sk),
888 NETLINK_CB(cb->skb).portid,
889 cb->nlh->nlmsg_seq, NLM_F_MULTI,
890 cb->nlh);
891 if (res < 0) {
892 spin_unlock_bh(lock);
893 goto done;
894 }
895 next_normal:
896 ++num;
897 }
898
899 spin_unlock_bh(lock);
900 cond_resched();
901 }
902
903 done:
904 cb->args[1] = i;
905 cb->args[2] = num;
906 out:
907 ;
908 }
909 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
910
911 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
912 const struct inet_diag_req_v2 *r,
913 struct nlattr *bc)
914 {
915 const struct inet_diag_handler *handler;
916 int err = 0;
917
918 handler = inet_diag_lock_handler(r->sdiag_protocol);
919 if (!IS_ERR(handler))
920 handler->dump(skb, cb, r, bc);
921 else
922 err = PTR_ERR(handler);
923 inet_diag_unlock_handler(handler);
924
925 return err ? : skb->len;
926 }
927
928 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
929 {
930 int hdrlen = sizeof(struct inet_diag_req_v2);
931 struct nlattr *bc = NULL;
932
933 if (nlmsg_attrlen(cb->nlh, hdrlen))
934 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
935
936 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
937 }
938
939 static int inet_diag_type2proto(int type)
940 {
941 switch (type) {
942 case TCPDIAG_GETSOCK:
943 return IPPROTO_TCP;
944 case DCCPDIAG_GETSOCK:
945 return IPPROTO_DCCP;
946 default:
947 return 0;
948 }
949 }
950
951 static int inet_diag_dump_compat(struct sk_buff *skb,
952 struct netlink_callback *cb)
953 {
954 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
955 int hdrlen = sizeof(struct inet_diag_req);
956 struct inet_diag_req_v2 req;
957 struct nlattr *bc = NULL;
958
959 req.sdiag_family = AF_UNSPEC; /* compatibility */
960 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
961 req.idiag_ext = rc->idiag_ext;
962 req.idiag_states = rc->idiag_states;
963 req.id = rc->id;
964
965 if (nlmsg_attrlen(cb->nlh, hdrlen))
966 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
967
968 return __inet_diag_dump(skb, cb, &req, bc);
969 }
970
971 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
972 const struct nlmsghdr *nlh)
973 {
974 struct inet_diag_req *rc = nlmsg_data(nlh);
975 struct inet_diag_req_v2 req;
976
977 req.sdiag_family = rc->idiag_family;
978 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
979 req.idiag_ext = rc->idiag_ext;
980 req.idiag_states = rc->idiag_states;
981 req.id = rc->id;
982
983 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
984 }
985
986 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
987 {
988 int hdrlen = sizeof(struct inet_diag_req);
989 struct net *net = sock_net(skb->sk);
990
991 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
992 nlmsg_len(nlh) < hdrlen)
993 return -EINVAL;
994
995 if (nlh->nlmsg_flags & NLM_F_DUMP) {
996 if (nlmsg_attrlen(nlh, hdrlen)) {
997 struct nlattr *attr;
998
999 attr = nlmsg_find_attr(nlh, hdrlen,
1000 INET_DIAG_REQ_BYTECODE);
1001 if (!attr ||
1002 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1003 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1004 return -EINVAL;
1005 }
1006 {
1007 struct netlink_dump_control c = {
1008 .dump = inet_diag_dump_compat,
1009 };
1010 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1011 }
1012 }
1013
1014 return inet_diag_get_exact_compat(skb, nlh);
1015 }
1016
1017 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1018 {
1019 int hdrlen = sizeof(struct inet_diag_req_v2);
1020 struct net *net = sock_net(skb->sk);
1021
1022 if (nlmsg_len(h) < hdrlen)
1023 return -EINVAL;
1024
1025 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1026 h->nlmsg_flags & NLM_F_DUMP) {
1027 if (nlmsg_attrlen(h, hdrlen)) {
1028 struct nlattr *attr;
1029
1030 attr = nlmsg_find_attr(h, hdrlen,
1031 INET_DIAG_REQ_BYTECODE);
1032 if (!attr ||
1033 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1034 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1035 return -EINVAL;
1036 }
1037 {
1038 struct netlink_dump_control c = {
1039 .dump = inet_diag_dump,
1040 };
1041 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1042 }
1043 }
1044
1045 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1046 }
1047
1048 static
1049 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1050 {
1051 const struct inet_diag_handler *handler;
1052 struct nlmsghdr *nlh;
1053 struct nlattr *attr;
1054 struct inet_diag_msg *r;
1055 void *info = NULL;
1056 int err = 0;
1057
1058 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1059 if (!nlh)
1060 return -ENOMEM;
1061
1062 r = nlmsg_data(nlh);
1063 memset(r, 0, sizeof(*r));
1064 inet_diag_msg_common_fill(r, sk);
1065 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1066 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1067 r->idiag_state = sk->sk_state;
1068
1069 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1070 nlmsg_cancel(skb, nlh);
1071 return err;
1072 }
1073
1074 handler = inet_diag_lock_handler(sk->sk_protocol);
1075 if (IS_ERR(handler)) {
1076 inet_diag_unlock_handler(handler);
1077 nlmsg_cancel(skb, nlh);
1078 return PTR_ERR(handler);
1079 }
1080
1081 attr = handler->idiag_info_size
1082 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1083 handler->idiag_info_size,
1084 INET_DIAG_PAD)
1085 : NULL;
1086 if (attr)
1087 info = nla_data(attr);
1088
1089 handler->idiag_get_info(sk, r, info);
1090 inet_diag_unlock_handler(handler);
1091
1092 nlmsg_end(skb, nlh);
1093 return 0;
1094 }
1095
1096 static const struct sock_diag_handler inet_diag_handler = {
1097 .family = AF_INET,
1098 .dump = inet_diag_handler_cmd,
1099 .get_info = inet_diag_handler_get_info,
1100 .destroy = inet_diag_handler_cmd,
1101 };
1102
1103 static const struct sock_diag_handler inet6_diag_handler = {
1104 .family = AF_INET6,
1105 .dump = inet_diag_handler_cmd,
1106 .get_info = inet_diag_handler_get_info,
1107 .destroy = inet_diag_handler_cmd,
1108 };
1109
1110 int inet_diag_register(const struct inet_diag_handler *h)
1111 {
1112 const __u16 type = h->idiag_type;
1113 int err = -EINVAL;
1114
1115 if (type >= IPPROTO_MAX)
1116 goto out;
1117
1118 mutex_lock(&inet_diag_table_mutex);
1119 err = -EEXIST;
1120 if (!inet_diag_table[type]) {
1121 inet_diag_table[type] = h;
1122 err = 0;
1123 }
1124 mutex_unlock(&inet_diag_table_mutex);
1125 out:
1126 return err;
1127 }
1128 EXPORT_SYMBOL_GPL(inet_diag_register);
1129
1130 void inet_diag_unregister(const struct inet_diag_handler *h)
1131 {
1132 const __u16 type = h->idiag_type;
1133
1134 if (type >= IPPROTO_MAX)
1135 return;
1136
1137 mutex_lock(&inet_diag_table_mutex);
1138 inet_diag_table[type] = NULL;
1139 mutex_unlock(&inet_diag_table_mutex);
1140 }
1141 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1142
1143 static int __init inet_diag_init(void)
1144 {
1145 const int inet_diag_table_size = (IPPROTO_MAX *
1146 sizeof(struct inet_diag_handler *));
1147 int err = -ENOMEM;
1148
1149 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1150 if (!inet_diag_table)
1151 goto out;
1152
1153 err = sock_diag_register(&inet_diag_handler);
1154 if (err)
1155 goto out_free_nl;
1156
1157 err = sock_diag_register(&inet6_diag_handler);
1158 if (err)
1159 goto out_free_inet;
1160
1161 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1162 out:
1163 return err;
1164
1165 out_free_inet:
1166 sock_diag_unregister(&inet_diag_handler);
1167 out_free_nl:
1168 kfree(inet_diag_table);
1169 goto out;
1170 }
1171
1172 static void __exit inet_diag_exit(void)
1173 {
1174 sock_diag_unregister(&inet6_diag_handler);
1175 sock_diag_unregister(&inet_diag_handler);
1176 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1177 kfree(inet_diag_table);
1178 }
1179
1180 module_init(inet_diag_init);
1181 module_exit(inet_diag_exit);
1182 MODULE_LICENSE("GPL");
1183 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1184 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
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