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fb: adv7393: off by one in probe function
[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 };
49
50 static DEFINE_MUTEX(inet_diag_table_mutex);
51
52 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
53 {
54 if (!inet_diag_table[proto])
55 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
56 NETLINK_SOCK_DIAG, AF_INET, proto);
57
58 mutex_lock(&inet_diag_table_mutex);
59 if (!inet_diag_table[proto])
60 return ERR_PTR(-ENOENT);
61
62 return inet_diag_table[proto];
63 }
64
65 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
66 {
67 mutex_unlock(&inet_diag_table_mutex);
68 }
69
70 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
71 {
72 r->idiag_family = sk->sk_family;
73
74 r->id.idiag_sport = htons(sk->sk_num);
75 r->id.idiag_dport = sk->sk_dport;
76 r->id.idiag_if = sk->sk_bound_dev_if;
77 sock_diag_save_cookie(sk, r->id.idiag_cookie);
78
79 #if IS_ENABLED(CONFIG_IPV6)
80 if (sk->sk_family == AF_INET6) {
81 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
82 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
83 } else
84 #endif
85 {
86 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
87 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
88
89 r->id.idiag_src[0] = sk->sk_rcv_saddr;
90 r->id.idiag_dst[0] = sk->sk_daddr;
91 }
92 }
93 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
94
95 static size_t inet_sk_attr_size(void)
96 {
97 return nla_total_size(sizeof(struct tcp_info))
98 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
99 + nla_total_size(1) /* INET_DIAG_TOS */
100 + nla_total_size(1) /* INET_DIAG_TCLASS */
101 + nla_total_size(sizeof(struct inet_diag_meminfo))
102 + nla_total_size(sizeof(struct inet_diag_msg))
103 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
104 + nla_total_size(TCP_CA_NAME_MAX)
105 + nla_total_size(sizeof(struct tcpvegas_info))
106 + 64;
107 }
108
109 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
110 struct inet_diag_msg *r, int ext,
111 struct user_namespace *user_ns)
112 {
113 const struct inet_sock *inet = inet_sk(sk);
114
115 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
116 goto errout;
117
118 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
119 * hence this needs to be included regardless of socket family.
120 */
121 if (ext & (1 << (INET_DIAG_TOS - 1)))
122 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
123 goto errout;
124
125 #if IS_ENABLED(CONFIG_IPV6)
126 if (r->idiag_family == AF_INET6) {
127 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
128 if (nla_put_u8(skb, INET_DIAG_TCLASS,
129 inet6_sk(sk)->tclass) < 0)
130 goto errout;
131
132 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
133 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
134 goto errout;
135 }
136 #endif
137
138 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
139 r->idiag_inode = sock_i_ino(sk);
140
141 return 0;
142 errout:
143 return 1;
144 }
145 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
146
147 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
148 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
149 struct user_namespace *user_ns,
150 u32 portid, u32 seq, u16 nlmsg_flags,
151 const struct nlmsghdr *unlh)
152 {
153 const struct tcp_congestion_ops *ca_ops;
154 const struct inet_diag_handler *handler;
155 int ext = req->idiag_ext;
156 struct inet_diag_msg *r;
157 struct nlmsghdr *nlh;
158 struct nlattr *attr;
159 void *info = NULL;
160
161 handler = inet_diag_table[req->sdiag_protocol];
162 BUG_ON(!handler);
163
164 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
165 nlmsg_flags);
166 if (!nlh)
167 return -EMSGSIZE;
168
169 r = nlmsg_data(nlh);
170 BUG_ON(!sk_fullsock(sk));
171
172 inet_diag_msg_common_fill(r, sk);
173 r->idiag_state = sk->sk_state;
174 r->idiag_timer = 0;
175 r->idiag_retrans = 0;
176
177 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns))
178 goto errout;
179
180 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
181 struct inet_diag_meminfo minfo = {
182 .idiag_rmem = sk_rmem_alloc_get(sk),
183 .idiag_wmem = sk->sk_wmem_queued,
184 .idiag_fmem = sk->sk_forward_alloc,
185 .idiag_tmem = sk_wmem_alloc_get(sk),
186 };
187
188 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
189 goto errout;
190 }
191
192 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
193 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
194 goto errout;
195
196 if (!icsk) {
197 handler->idiag_get_info(sk, r, NULL);
198 goto out;
199 }
200
201 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
202 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
203 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
204 r->idiag_timer = 1;
205 r->idiag_retrans = icsk->icsk_retransmits;
206 r->idiag_expires =
207 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
208 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
209 r->idiag_timer = 4;
210 r->idiag_retrans = icsk->icsk_probes_out;
211 r->idiag_expires =
212 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
213 } else if (timer_pending(&sk->sk_timer)) {
214 r->idiag_timer = 2;
215 r->idiag_retrans = icsk->icsk_probes_out;
216 r->idiag_expires =
217 jiffies_to_msecs(sk->sk_timer.expires - jiffies);
218 } else {
219 r->idiag_timer = 0;
220 r->idiag_expires = 0;
221 }
222
223 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
224 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
225 handler->idiag_info_size,
226 INET_DIAG_PAD);
227 if (!attr)
228 goto errout;
229
230 info = nla_data(attr);
231 }
232
233 if (ext & (1 << (INET_DIAG_CONG - 1))) {
234 int err = 0;
235
236 rcu_read_lock();
237 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
238 if (ca_ops)
239 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
240 rcu_read_unlock();
241 if (err < 0)
242 goto errout;
243 }
244
245 handler->idiag_get_info(sk, r, info);
246
247 if (sk->sk_state < TCP_TIME_WAIT) {
248 union tcp_cc_info info;
249 size_t sz = 0;
250 int attr;
251
252 rcu_read_lock();
253 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
254 if (ca_ops && ca_ops->get_info)
255 sz = ca_ops->get_info(sk, ext, &attr, &info);
256 rcu_read_unlock();
257 if (sz && nla_put(skb, attr, sz, &info) < 0)
258 goto errout;
259 }
260
261 out:
262 nlmsg_end(skb, nlh);
263 return 0;
264
265 errout:
266 nlmsg_cancel(skb, nlh);
267 return -EMSGSIZE;
268 }
269 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
270
271 static int inet_csk_diag_fill(struct sock *sk,
272 struct sk_buff *skb,
273 const struct inet_diag_req_v2 *req,
274 struct user_namespace *user_ns,
275 u32 portid, u32 seq, u16 nlmsg_flags,
276 const struct nlmsghdr *unlh)
277 {
278 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
279 user_ns, portid, seq, nlmsg_flags, unlh);
280 }
281
282 static int inet_twsk_diag_fill(struct sock *sk,
283 struct sk_buff *skb,
284 u32 portid, u32 seq, u16 nlmsg_flags,
285 const struct nlmsghdr *unlh)
286 {
287 struct inet_timewait_sock *tw = inet_twsk(sk);
288 struct inet_diag_msg *r;
289 struct nlmsghdr *nlh;
290 long tmo;
291
292 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
293 nlmsg_flags);
294 if (!nlh)
295 return -EMSGSIZE;
296
297 r = nlmsg_data(nlh);
298 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
299
300 tmo = tw->tw_timer.expires - jiffies;
301 if (tmo < 0)
302 tmo = 0;
303
304 inet_diag_msg_common_fill(r, sk);
305 r->idiag_retrans = 0;
306
307 r->idiag_state = tw->tw_substate;
308 r->idiag_timer = 3;
309 r->idiag_expires = jiffies_to_msecs(tmo);
310 r->idiag_rqueue = 0;
311 r->idiag_wqueue = 0;
312 r->idiag_uid = 0;
313 r->idiag_inode = 0;
314
315 nlmsg_end(skb, nlh);
316 return 0;
317 }
318
319 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
320 u32 portid, u32 seq, u16 nlmsg_flags,
321 const struct nlmsghdr *unlh)
322 {
323 struct inet_diag_msg *r;
324 struct nlmsghdr *nlh;
325 long tmo;
326
327 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
328 nlmsg_flags);
329 if (!nlh)
330 return -EMSGSIZE;
331
332 r = nlmsg_data(nlh);
333 inet_diag_msg_common_fill(r, sk);
334 r->idiag_state = TCP_SYN_RECV;
335 r->idiag_timer = 1;
336 r->idiag_retrans = inet_reqsk(sk)->num_retrans;
337
338 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
339 offsetof(struct sock, sk_cookie));
340
341 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
342 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
343 r->idiag_rqueue = 0;
344 r->idiag_wqueue = 0;
345 r->idiag_uid = 0;
346 r->idiag_inode = 0;
347
348 nlmsg_end(skb, nlh);
349 return 0;
350 }
351
352 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
353 const struct inet_diag_req_v2 *r,
354 struct user_namespace *user_ns,
355 u32 portid, u32 seq, u16 nlmsg_flags,
356 const struct nlmsghdr *unlh)
357 {
358 if (sk->sk_state == TCP_TIME_WAIT)
359 return inet_twsk_diag_fill(sk, skb, portid, seq,
360 nlmsg_flags, unlh);
361
362 if (sk->sk_state == TCP_NEW_SYN_RECV)
363 return inet_req_diag_fill(sk, skb, portid, seq,
364 nlmsg_flags, unlh);
365
366 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
367 nlmsg_flags, unlh);
368 }
369
370 struct sock *inet_diag_find_one_icsk(struct net *net,
371 struct inet_hashinfo *hashinfo,
372 const struct inet_diag_req_v2 *req)
373 {
374 struct sock *sk;
375
376 rcu_read_lock();
377 if (req->sdiag_family == AF_INET)
378 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
379 req->id.idiag_dport, req->id.idiag_src[0],
380 req->id.idiag_sport, req->id.idiag_if);
381 #if IS_ENABLED(CONFIG_IPV6)
382 else if (req->sdiag_family == AF_INET6) {
383 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
384 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
385 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
386 req->id.idiag_dport, req->id.idiag_src[3],
387 req->id.idiag_sport, req->id.idiag_if);
388 else
389 sk = inet6_lookup(net, hashinfo, NULL, 0,
390 (struct in6_addr *)req->id.idiag_dst,
391 req->id.idiag_dport,
392 (struct in6_addr *)req->id.idiag_src,
393 req->id.idiag_sport,
394 req->id.idiag_if);
395 }
396 #endif
397 else {
398 rcu_read_unlock();
399 return ERR_PTR(-EINVAL);
400 }
401 rcu_read_unlock();
402 if (!sk)
403 return ERR_PTR(-ENOENT);
404
405 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
406 sock_gen_put(sk);
407 return ERR_PTR(-ENOENT);
408 }
409
410 return sk;
411 }
412 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
413
414 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
415 struct sk_buff *in_skb,
416 const struct nlmsghdr *nlh,
417 const struct inet_diag_req_v2 *req)
418 {
419 struct net *net = sock_net(in_skb->sk);
420 struct sk_buff *rep;
421 struct sock *sk;
422 int err;
423
424 sk = inet_diag_find_one_icsk(net, hashinfo, req);
425 if (IS_ERR(sk))
426 return PTR_ERR(sk);
427
428 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
429 if (!rep) {
430 err = -ENOMEM;
431 goto out;
432 }
433
434 err = sk_diag_fill(sk, rep, req,
435 sk_user_ns(NETLINK_CB(in_skb).sk),
436 NETLINK_CB(in_skb).portid,
437 nlh->nlmsg_seq, 0, nlh);
438 if (err < 0) {
439 WARN_ON(err == -EMSGSIZE);
440 nlmsg_free(rep);
441 goto out;
442 }
443 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
444 MSG_DONTWAIT);
445 if (err > 0)
446 err = 0;
447
448 out:
449 if (sk)
450 sock_gen_put(sk);
451
452 return err;
453 }
454 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
455
456 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
457 const struct nlmsghdr *nlh,
458 const struct inet_diag_req_v2 *req)
459 {
460 const struct inet_diag_handler *handler;
461 int err;
462
463 handler = inet_diag_lock_handler(req->sdiag_protocol);
464 if (IS_ERR(handler))
465 err = PTR_ERR(handler);
466 else if (cmd == SOCK_DIAG_BY_FAMILY)
467 err = handler->dump_one(in_skb, nlh, req);
468 else if (cmd == SOCK_DESTROY && handler->destroy)
469 err = handler->destroy(in_skb, req);
470 else
471 err = -EOPNOTSUPP;
472 inet_diag_unlock_handler(handler);
473
474 return err;
475 }
476
477 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
478 {
479 int words = bits >> 5;
480
481 bits &= 0x1f;
482
483 if (words) {
484 if (memcmp(a1, a2, words << 2))
485 return 0;
486 }
487 if (bits) {
488 __be32 w1, w2;
489 __be32 mask;
490
491 w1 = a1[words];
492 w2 = a2[words];
493
494 mask = htonl((0xffffffff) << (32 - bits));
495
496 if ((w1 ^ w2) & mask)
497 return 0;
498 }
499
500 return 1;
501 }
502
503 static int inet_diag_bc_run(const struct nlattr *_bc,
504 const struct inet_diag_entry *entry)
505 {
506 const void *bc = nla_data(_bc);
507 int len = nla_len(_bc);
508
509 while (len > 0) {
510 int yes = 1;
511 const struct inet_diag_bc_op *op = bc;
512
513 switch (op->code) {
514 case INET_DIAG_BC_NOP:
515 break;
516 case INET_DIAG_BC_JMP:
517 yes = 0;
518 break;
519 case INET_DIAG_BC_S_GE:
520 yes = entry->sport >= op[1].no;
521 break;
522 case INET_DIAG_BC_S_LE:
523 yes = entry->sport <= op[1].no;
524 break;
525 case INET_DIAG_BC_D_GE:
526 yes = entry->dport >= op[1].no;
527 break;
528 case INET_DIAG_BC_D_LE:
529 yes = entry->dport <= op[1].no;
530 break;
531 case INET_DIAG_BC_AUTO:
532 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
533 break;
534 case INET_DIAG_BC_S_COND:
535 case INET_DIAG_BC_D_COND: {
536 const struct inet_diag_hostcond *cond;
537 const __be32 *addr;
538
539 cond = (const struct inet_diag_hostcond *)(op + 1);
540 if (cond->port != -1 &&
541 cond->port != (op->code == INET_DIAG_BC_S_COND ?
542 entry->sport : entry->dport)) {
543 yes = 0;
544 break;
545 }
546
547 if (op->code == INET_DIAG_BC_S_COND)
548 addr = entry->saddr;
549 else
550 addr = entry->daddr;
551
552 if (cond->family != AF_UNSPEC &&
553 cond->family != entry->family) {
554 if (entry->family == AF_INET6 &&
555 cond->family == AF_INET) {
556 if (addr[0] == 0 && addr[1] == 0 &&
557 addr[2] == htonl(0xffff) &&
558 bitstring_match(addr + 3,
559 cond->addr,
560 cond->prefix_len))
561 break;
562 }
563 yes = 0;
564 break;
565 }
566
567 if (cond->prefix_len == 0)
568 break;
569 if (bitstring_match(addr, cond->addr,
570 cond->prefix_len))
571 break;
572 yes = 0;
573 break;
574 }
575 case INET_DIAG_BC_DEV_COND: {
576 u32 ifindex;
577
578 ifindex = *((const u32 *)(op + 1));
579 if (ifindex != entry->ifindex)
580 yes = 0;
581 break;
582 }
583 }
584
585 if (yes) {
586 len -= op->yes;
587 bc += op->yes;
588 } else {
589 len -= op->no;
590 bc += op->no;
591 }
592 }
593 return len == 0;
594 }
595
596 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
597 */
598 static void entry_fill_addrs(struct inet_diag_entry *entry,
599 const struct sock *sk)
600 {
601 #if IS_ENABLED(CONFIG_IPV6)
602 if (sk->sk_family == AF_INET6) {
603 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
604 entry->daddr = sk->sk_v6_daddr.s6_addr32;
605 } else
606 #endif
607 {
608 entry->saddr = &sk->sk_rcv_saddr;
609 entry->daddr = &sk->sk_daddr;
610 }
611 }
612
613 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
614 {
615 struct inet_sock *inet = inet_sk(sk);
616 struct inet_diag_entry entry;
617
618 if (!bc)
619 return 1;
620
621 entry.family = sk->sk_family;
622 entry_fill_addrs(&entry, sk);
623 entry.sport = inet->inet_num;
624 entry.dport = ntohs(inet->inet_dport);
625 entry.ifindex = sk->sk_bound_dev_if;
626 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
627
628 return inet_diag_bc_run(bc, &entry);
629 }
630 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
631
632 static int valid_cc(const void *bc, int len, int cc)
633 {
634 while (len >= 0) {
635 const struct inet_diag_bc_op *op = bc;
636
637 if (cc > len)
638 return 0;
639 if (cc == len)
640 return 1;
641 if (op->yes < 4 || op->yes & 3)
642 return 0;
643 len -= op->yes;
644 bc += op->yes;
645 }
646 return 0;
647 }
648
649 /* data is u32 ifindex */
650 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
651 int *min_len)
652 {
653 /* Check ifindex space. */
654 *min_len += sizeof(u32);
655 if (len < *min_len)
656 return false;
657
658 return true;
659 }
660 /* Validate an inet_diag_hostcond. */
661 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
662 int *min_len)
663 {
664 struct inet_diag_hostcond *cond;
665 int addr_len;
666
667 /* Check hostcond space. */
668 *min_len += sizeof(struct inet_diag_hostcond);
669 if (len < *min_len)
670 return false;
671 cond = (struct inet_diag_hostcond *)(op + 1);
672
673 /* Check address family and address length. */
674 switch (cond->family) {
675 case AF_UNSPEC:
676 addr_len = 0;
677 break;
678 case AF_INET:
679 addr_len = sizeof(struct in_addr);
680 break;
681 case AF_INET6:
682 addr_len = sizeof(struct in6_addr);
683 break;
684 default:
685 return false;
686 }
687 *min_len += addr_len;
688 if (len < *min_len)
689 return false;
690
691 /* Check prefix length (in bits) vs address length (in bytes). */
692 if (cond->prefix_len > 8 * addr_len)
693 return false;
694
695 return true;
696 }
697
698 /* Validate a port comparison operator. */
699 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
700 int len, int *min_len)
701 {
702 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
703 *min_len += sizeof(struct inet_diag_bc_op);
704 if (len < *min_len)
705 return false;
706 return true;
707 }
708
709 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
710 {
711 const void *bc = bytecode;
712 int len = bytecode_len;
713
714 while (len > 0) {
715 int min_len = sizeof(struct inet_diag_bc_op);
716 const struct inet_diag_bc_op *op = bc;
717
718 switch (op->code) {
719 case INET_DIAG_BC_S_COND:
720 case INET_DIAG_BC_D_COND:
721 if (!valid_hostcond(bc, len, &min_len))
722 return -EINVAL;
723 break;
724 case INET_DIAG_BC_DEV_COND:
725 if (!valid_devcond(bc, len, &min_len))
726 return -EINVAL;
727 break;
728 case INET_DIAG_BC_S_GE:
729 case INET_DIAG_BC_S_LE:
730 case INET_DIAG_BC_D_GE:
731 case INET_DIAG_BC_D_LE:
732 if (!valid_port_comparison(bc, len, &min_len))
733 return -EINVAL;
734 break;
735 case INET_DIAG_BC_AUTO:
736 case INET_DIAG_BC_JMP:
737 case INET_DIAG_BC_NOP:
738 break;
739 default:
740 return -EINVAL;
741 }
742
743 if (op->code != INET_DIAG_BC_NOP) {
744 if (op->no < min_len || op->no > len + 4 || op->no & 3)
745 return -EINVAL;
746 if (op->no < len &&
747 !valid_cc(bytecode, bytecode_len, len - op->no))
748 return -EINVAL;
749 }
750
751 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
752 return -EINVAL;
753 bc += op->yes;
754 len -= op->yes;
755 }
756 return len == 0 ? 0 : -EINVAL;
757 }
758
759 static int inet_csk_diag_dump(struct sock *sk,
760 struct sk_buff *skb,
761 struct netlink_callback *cb,
762 const struct inet_diag_req_v2 *r,
763 const struct nlattr *bc)
764 {
765 if (!inet_diag_bc_sk(bc, sk))
766 return 0;
767
768 return inet_csk_diag_fill(sk, skb, r,
769 sk_user_ns(NETLINK_CB(cb->skb).sk),
770 NETLINK_CB(cb->skb).portid,
771 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
772 }
773
774 static void twsk_build_assert(void)
775 {
776 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
777 offsetof(struct sock, sk_family));
778
779 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
780 offsetof(struct inet_sock, inet_num));
781
782 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
783 offsetof(struct inet_sock, inet_dport));
784
785 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
786 offsetof(struct inet_sock, inet_rcv_saddr));
787
788 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
789 offsetof(struct inet_sock, inet_daddr));
790
791 #if IS_ENABLED(CONFIG_IPV6)
792 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
793 offsetof(struct sock, sk_v6_rcv_saddr));
794
795 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
796 offsetof(struct sock, sk_v6_daddr));
797 #endif
798 }
799
800 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
801 struct netlink_callback *cb,
802 const struct inet_diag_req_v2 *r, struct nlattr *bc)
803 {
804 struct net *net = sock_net(skb->sk);
805 int i, num, s_i, s_num;
806 u32 idiag_states = r->idiag_states;
807
808 if (idiag_states & TCPF_SYN_RECV)
809 idiag_states |= TCPF_NEW_SYN_RECV;
810 s_i = cb->args[1];
811 s_num = num = cb->args[2];
812
813 if (cb->args[0] == 0) {
814 if (!(idiag_states & TCPF_LISTEN))
815 goto skip_listen_ht;
816
817 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
818 struct inet_listen_hashbucket *ilb;
819 struct sock *sk;
820
821 num = 0;
822 ilb = &hashinfo->listening_hash[i];
823 spin_lock_bh(&ilb->lock);
824 sk_for_each(sk, &ilb->head) {
825 struct inet_sock *inet = inet_sk(sk);
826
827 if (!net_eq(sock_net(sk), net))
828 continue;
829
830 if (num < s_num) {
831 num++;
832 continue;
833 }
834
835 if (r->sdiag_family != AF_UNSPEC &&
836 sk->sk_family != r->sdiag_family)
837 goto next_listen;
838
839 if (r->id.idiag_sport != inet->inet_sport &&
840 r->id.idiag_sport)
841 goto next_listen;
842
843 if (r->id.idiag_dport ||
844 cb->args[3] > 0)
845 goto next_listen;
846
847 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
848 spin_unlock_bh(&ilb->lock);
849 goto done;
850 }
851
852 next_listen:
853 cb->args[3] = 0;
854 cb->args[4] = 0;
855 ++num;
856 }
857 spin_unlock_bh(&ilb->lock);
858
859 s_num = 0;
860 cb->args[3] = 0;
861 cb->args[4] = 0;
862 }
863 skip_listen_ht:
864 cb->args[0] = 1;
865 s_i = num = s_num = 0;
866 }
867
868 if (!(idiag_states & ~TCPF_LISTEN))
869 goto out;
870
871 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
872 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
873 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
874 struct hlist_nulls_node *node;
875 struct sock *sk;
876
877 num = 0;
878
879 if (hlist_nulls_empty(&head->chain))
880 continue;
881
882 if (i > s_i)
883 s_num = 0;
884
885 spin_lock_bh(lock);
886 sk_nulls_for_each(sk, node, &head->chain) {
887 int state, res;
888
889 if (!net_eq(sock_net(sk), net))
890 continue;
891 if (num < s_num)
892 goto next_normal;
893 state = (sk->sk_state == TCP_TIME_WAIT) ?
894 inet_twsk(sk)->tw_substate : sk->sk_state;
895 if (!(idiag_states & (1 << state)))
896 goto next_normal;
897 if (r->sdiag_family != AF_UNSPEC &&
898 sk->sk_family != r->sdiag_family)
899 goto next_normal;
900 if (r->id.idiag_sport != htons(sk->sk_num) &&
901 r->id.idiag_sport)
902 goto next_normal;
903 if (r->id.idiag_dport != sk->sk_dport &&
904 r->id.idiag_dport)
905 goto next_normal;
906 twsk_build_assert();
907
908 if (!inet_diag_bc_sk(bc, sk))
909 goto next_normal;
910
911 res = sk_diag_fill(sk, skb, r,
912 sk_user_ns(NETLINK_CB(cb->skb).sk),
913 NETLINK_CB(cb->skb).portid,
914 cb->nlh->nlmsg_seq, NLM_F_MULTI,
915 cb->nlh);
916 if (res < 0) {
917 spin_unlock_bh(lock);
918 goto done;
919 }
920 next_normal:
921 ++num;
922 }
923
924 spin_unlock_bh(lock);
925 cond_resched();
926 }
927
928 done:
929 cb->args[1] = i;
930 cb->args[2] = num;
931 out:
932 ;
933 }
934 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
935
936 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
937 const struct inet_diag_req_v2 *r,
938 struct nlattr *bc)
939 {
940 const struct inet_diag_handler *handler;
941 int err = 0;
942
943 handler = inet_diag_lock_handler(r->sdiag_protocol);
944 if (!IS_ERR(handler))
945 handler->dump(skb, cb, r, bc);
946 else
947 err = PTR_ERR(handler);
948 inet_diag_unlock_handler(handler);
949
950 return err ? : skb->len;
951 }
952
953 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
954 {
955 int hdrlen = sizeof(struct inet_diag_req_v2);
956 struct nlattr *bc = NULL;
957
958 if (nlmsg_attrlen(cb->nlh, hdrlen))
959 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
960
961 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
962 }
963
964 static int inet_diag_type2proto(int type)
965 {
966 switch (type) {
967 case TCPDIAG_GETSOCK:
968 return IPPROTO_TCP;
969 case DCCPDIAG_GETSOCK:
970 return IPPROTO_DCCP;
971 default:
972 return 0;
973 }
974 }
975
976 static int inet_diag_dump_compat(struct sk_buff *skb,
977 struct netlink_callback *cb)
978 {
979 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
980 int hdrlen = sizeof(struct inet_diag_req);
981 struct inet_diag_req_v2 req;
982 struct nlattr *bc = NULL;
983
984 req.sdiag_family = AF_UNSPEC; /* compatibility */
985 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
986 req.idiag_ext = rc->idiag_ext;
987 req.idiag_states = rc->idiag_states;
988 req.id = rc->id;
989
990 if (nlmsg_attrlen(cb->nlh, hdrlen))
991 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
992
993 return __inet_diag_dump(skb, cb, &req, bc);
994 }
995
996 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
997 const struct nlmsghdr *nlh)
998 {
999 struct inet_diag_req *rc = nlmsg_data(nlh);
1000 struct inet_diag_req_v2 req;
1001
1002 req.sdiag_family = rc->idiag_family;
1003 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1004 req.idiag_ext = rc->idiag_ext;
1005 req.idiag_states = rc->idiag_states;
1006 req.id = rc->id;
1007
1008 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1009 }
1010
1011 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1012 {
1013 int hdrlen = sizeof(struct inet_diag_req);
1014 struct net *net = sock_net(skb->sk);
1015
1016 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1017 nlmsg_len(nlh) < hdrlen)
1018 return -EINVAL;
1019
1020 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1021 if (nlmsg_attrlen(nlh, hdrlen)) {
1022 struct nlattr *attr;
1023
1024 attr = nlmsg_find_attr(nlh, hdrlen,
1025 INET_DIAG_REQ_BYTECODE);
1026 if (!attr ||
1027 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1028 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1029 return -EINVAL;
1030 }
1031 {
1032 struct netlink_dump_control c = {
1033 .dump = inet_diag_dump_compat,
1034 };
1035 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1036 }
1037 }
1038
1039 return inet_diag_get_exact_compat(skb, nlh);
1040 }
1041
1042 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1043 {
1044 int hdrlen = sizeof(struct inet_diag_req_v2);
1045 struct net *net = sock_net(skb->sk);
1046
1047 if (nlmsg_len(h) < hdrlen)
1048 return -EINVAL;
1049
1050 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1051 h->nlmsg_flags & NLM_F_DUMP) {
1052 if (nlmsg_attrlen(h, hdrlen)) {
1053 struct nlattr *attr;
1054
1055 attr = nlmsg_find_attr(h, hdrlen,
1056 INET_DIAG_REQ_BYTECODE);
1057 if (!attr ||
1058 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1059 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1060 return -EINVAL;
1061 }
1062 {
1063 struct netlink_dump_control c = {
1064 .dump = inet_diag_dump,
1065 };
1066 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1067 }
1068 }
1069
1070 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1071 }
1072
1073 static
1074 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1075 {
1076 const struct inet_diag_handler *handler;
1077 struct nlmsghdr *nlh;
1078 struct nlattr *attr;
1079 struct inet_diag_msg *r;
1080 void *info = NULL;
1081 int err = 0;
1082
1083 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1084 if (!nlh)
1085 return -ENOMEM;
1086
1087 r = nlmsg_data(nlh);
1088 memset(r, 0, sizeof(*r));
1089 inet_diag_msg_common_fill(r, sk);
1090 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1091 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1092 r->idiag_state = sk->sk_state;
1093
1094 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1095 nlmsg_cancel(skb, nlh);
1096 return err;
1097 }
1098
1099 handler = inet_diag_lock_handler(sk->sk_protocol);
1100 if (IS_ERR(handler)) {
1101 inet_diag_unlock_handler(handler);
1102 nlmsg_cancel(skb, nlh);
1103 return PTR_ERR(handler);
1104 }
1105
1106 attr = handler->idiag_info_size
1107 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1108 handler->idiag_info_size,
1109 INET_DIAG_PAD)
1110 : NULL;
1111 if (attr)
1112 info = nla_data(attr);
1113
1114 handler->idiag_get_info(sk, r, info);
1115 inet_diag_unlock_handler(handler);
1116
1117 nlmsg_end(skb, nlh);
1118 return 0;
1119 }
1120
1121 static const struct sock_diag_handler inet_diag_handler = {
1122 .family = AF_INET,
1123 .dump = inet_diag_handler_cmd,
1124 .get_info = inet_diag_handler_get_info,
1125 .destroy = inet_diag_handler_cmd,
1126 };
1127
1128 static const struct sock_diag_handler inet6_diag_handler = {
1129 .family = AF_INET6,
1130 .dump = inet_diag_handler_cmd,
1131 .get_info = inet_diag_handler_get_info,
1132 .destroy = inet_diag_handler_cmd,
1133 };
1134
1135 int inet_diag_register(const struct inet_diag_handler *h)
1136 {
1137 const __u16 type = h->idiag_type;
1138 int err = -EINVAL;
1139
1140 if (type >= IPPROTO_MAX)
1141 goto out;
1142
1143 mutex_lock(&inet_diag_table_mutex);
1144 err = -EEXIST;
1145 if (!inet_diag_table[type]) {
1146 inet_diag_table[type] = h;
1147 err = 0;
1148 }
1149 mutex_unlock(&inet_diag_table_mutex);
1150 out:
1151 return err;
1152 }
1153 EXPORT_SYMBOL_GPL(inet_diag_register);
1154
1155 void inet_diag_unregister(const struct inet_diag_handler *h)
1156 {
1157 const __u16 type = h->idiag_type;
1158
1159 if (type >= IPPROTO_MAX)
1160 return;
1161
1162 mutex_lock(&inet_diag_table_mutex);
1163 inet_diag_table[type] = NULL;
1164 mutex_unlock(&inet_diag_table_mutex);
1165 }
1166 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1167
1168 static int __init inet_diag_init(void)
1169 {
1170 const int inet_diag_table_size = (IPPROTO_MAX *
1171 sizeof(struct inet_diag_handler *));
1172 int err = -ENOMEM;
1173
1174 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1175 if (!inet_diag_table)
1176 goto out;
1177
1178 err = sock_diag_register(&inet_diag_handler);
1179 if (err)
1180 goto out_free_nl;
1181
1182 err = sock_diag_register(&inet6_diag_handler);
1183 if (err)
1184 goto out_free_inet;
1185
1186 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1187 out:
1188 return err;
1189
1190 out_free_inet:
1191 sock_diag_unregister(&inet_diag_handler);
1192 out_free_nl:
1193 kfree(inet_diag_table);
1194 goto out;
1195 }
1196
1197 static void __exit inet_diag_exit(void)
1198 {
1199 sock_diag_unregister(&inet6_diag_handler);
1200 sock_diag_unregister(&inet_diag_handler);
1201 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1202 kfree(inet_diag_table);
1203 }
1204
1205 module_init(inet_diag_init);
1206 module_exit(inet_diag_exit);
1207 MODULE_LICENSE("GPL");
1208 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1209 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
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