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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / net / ipv4 / inet_diag.c
blob5fdb02f5598ebd47d303d5a2df2f1cef4ea5073d
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 static 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
93 static size_t inet_sk_attr_size(void)
94 {
95 return nla_total_size(sizeof(struct tcp_info))
96 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
97 + nla_total_size(1) /* INET_DIAG_TOS */
98 + nla_total_size(1) /* INET_DIAG_TCLASS */
99 + nla_total_size(sizeof(struct inet_diag_meminfo))
100 + nla_total_size(sizeof(struct inet_diag_msg))
101 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
102 + nla_total_size(TCP_CA_NAME_MAX)
103 + nla_total_size(sizeof(struct tcpvegas_info))
104 + 64;
105 }
106
107 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
108 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
109 struct user_namespace *user_ns,
110 u32 portid, u32 seq, u16 nlmsg_flags,
111 const struct nlmsghdr *unlh)
112 {
113 const struct inet_sock *inet = inet_sk(sk);
114 const struct tcp_congestion_ops *ca_ops;
115 const struct inet_diag_handler *handler;
116 int ext = req->idiag_ext;
117 struct inet_diag_msg *r;
118 struct nlmsghdr *nlh;
119 struct nlattr *attr;
120 void *info = NULL;
121
122 handler = inet_diag_table[req->sdiag_protocol];
123 BUG_ON(!handler);
124
125 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
126 nlmsg_flags);
127 if (!nlh)
128 return -EMSGSIZE;
129
130 r = nlmsg_data(nlh);
131 BUG_ON(!sk_fullsock(sk));
132
133 inet_diag_msg_common_fill(r, sk);
134 r->idiag_state = sk->sk_state;
135 r->idiag_timer = 0;
136 r->idiag_retrans = 0;
137
138 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
139 goto errout;
140
141 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
142 * hence this needs to be included regardless of socket family.
143 */
144 if (ext & (1 << (INET_DIAG_TOS - 1)))
145 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
146 goto errout;
147
148 #if IS_ENABLED(CONFIG_IPV6)
149 if (r->idiag_family == AF_INET6) {
150 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
151 if (nla_put_u8(skb, INET_DIAG_TCLASS,
152 inet6_sk(sk)->tclass) < 0)
153 goto errout;
154
155 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
156 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
157 goto errout;
158 }
159 #endif
160
161 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
162 r->idiag_inode = sock_i_ino(sk);
163
164 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
165 struct inet_diag_meminfo minfo = {
166 .idiag_rmem = sk_rmem_alloc_get(sk),
167 .idiag_wmem = sk->sk_wmem_queued,
168 .idiag_fmem = sk->sk_forward_alloc,
169 .idiag_tmem = sk_wmem_alloc_get(sk),
170 };
171
172 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
173 goto errout;
174 }
175
176 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
177 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
178 goto errout;
179
180 if (!icsk) {
181 handler->idiag_get_info(sk, r, NULL);
182 goto out;
183 }
184
185 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
186
187 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
188 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
189 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
190 r->idiag_timer = 1;
191 r->idiag_retrans = icsk->icsk_retransmits;
192 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
193 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
194 r->idiag_timer = 4;
195 r->idiag_retrans = icsk->icsk_probes_out;
196 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
197 } else if (timer_pending(&sk->sk_timer)) {
198 r->idiag_timer = 2;
199 r->idiag_retrans = icsk->icsk_probes_out;
200 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
201 } else {
202 r->idiag_timer = 0;
203 r->idiag_expires = 0;
204 }
205 #undef EXPIRES_IN_MS
206
207 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
208 attr = nla_reserve(skb, INET_DIAG_INFO,
209 handler->idiag_info_size);
210 if (!attr)
211 goto errout;
212
213 info = nla_data(attr);
214 }
215
216 if (ext & (1 << (INET_DIAG_CONG - 1))) {
217 int err = 0;
218
219 rcu_read_lock();
220 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
221 if (ca_ops)
222 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
223 rcu_read_unlock();
224 if (err < 0)
225 goto errout;
226 }
227
228 handler->idiag_get_info(sk, r, info);
229
230 if (sk->sk_state < TCP_TIME_WAIT) {
231 union tcp_cc_info info;
232 size_t sz = 0;
233 int attr;
234
235 rcu_read_lock();
236 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
237 if (ca_ops && ca_ops->get_info)
238 sz = ca_ops->get_info(sk, ext, &attr, &info);
239 rcu_read_unlock();
240 if (sz && nla_put(skb, attr, sz, &info) < 0)
241 goto errout;
242 }
243
244 out:
245 nlmsg_end(skb, nlh);
246 return 0;
247
248 errout:
249 nlmsg_cancel(skb, nlh);
250 return -EMSGSIZE;
251 }
252 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
253
254 static int inet_csk_diag_fill(struct sock *sk,
255 struct sk_buff *skb,
256 const struct inet_diag_req_v2 *req,
257 struct user_namespace *user_ns,
258 u32 portid, u32 seq, u16 nlmsg_flags,
259 const struct nlmsghdr *unlh)
260 {
261 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
262 user_ns, portid, seq, nlmsg_flags, unlh);
263 }
264
265 static int inet_twsk_diag_fill(struct sock *sk,
266 struct sk_buff *skb,
267 u32 portid, u32 seq, u16 nlmsg_flags,
268 const struct nlmsghdr *unlh)
269 {
270 struct inet_timewait_sock *tw = inet_twsk(sk);
271 struct inet_diag_msg *r;
272 struct nlmsghdr *nlh;
273 long tmo;
274
275 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
276 nlmsg_flags);
277 if (!nlh)
278 return -EMSGSIZE;
279
280 r = nlmsg_data(nlh);
281 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
282
283 tmo = tw->tw_timer.expires - jiffies;
284 if (tmo < 0)
285 tmo = 0;
286
287 inet_diag_msg_common_fill(r, sk);
288 r->idiag_retrans = 0;
289
290 r->idiag_state = tw->tw_substate;
291 r->idiag_timer = 3;
292 r->idiag_expires = jiffies_to_msecs(tmo);
293 r->idiag_rqueue = 0;
294 r->idiag_wqueue = 0;
295 r->idiag_uid = 0;
296 r->idiag_inode = 0;
297
298 nlmsg_end(skb, nlh);
299 return 0;
300 }
301
302 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
303 u32 portid, u32 seq, u16 nlmsg_flags,
304 const struct nlmsghdr *unlh)
305 {
306 struct inet_diag_msg *r;
307 struct nlmsghdr *nlh;
308 long tmo;
309
310 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
311 nlmsg_flags);
312 if (!nlh)
313 return -EMSGSIZE;
314
315 r = nlmsg_data(nlh);
316 inet_diag_msg_common_fill(r, sk);
317 r->idiag_state = TCP_SYN_RECV;
318 r->idiag_timer = 1;
319 r->idiag_retrans = inet_reqsk(sk)->num_retrans;
320
321 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
322 offsetof(struct sock, sk_cookie));
323
324 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
325 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
326 r->idiag_rqueue = 0;
327 r->idiag_wqueue = 0;
328 r->idiag_uid = 0;
329 r->idiag_inode = 0;
330
331 nlmsg_end(skb, nlh);
332 return 0;
333 }
334
335 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
336 const struct inet_diag_req_v2 *r,
337 struct user_namespace *user_ns,
338 u32 portid, u32 seq, u16 nlmsg_flags,
339 const struct nlmsghdr *unlh)
340 {
341 if (sk->sk_state == TCP_TIME_WAIT)
342 return inet_twsk_diag_fill(sk, skb, portid, seq,
343 nlmsg_flags, unlh);
344
345 if (sk->sk_state == TCP_NEW_SYN_RECV)
346 return inet_req_diag_fill(sk, skb, portid, seq,
347 nlmsg_flags, unlh);
348
349 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
350 nlmsg_flags, unlh);
351 }
352
353 struct sock *inet_diag_find_one_icsk(struct net *net,
354 struct inet_hashinfo *hashinfo,
355 const struct inet_diag_req_v2 *req)
356 {
357 struct sock *sk;
358
359 if (req->sdiag_family == AF_INET)
360 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
361 req->id.idiag_dport, req->id.idiag_src[0],
362 req->id.idiag_sport, req->id.idiag_if);
363 #if IS_ENABLED(CONFIG_IPV6)
364 else if (req->sdiag_family == AF_INET6) {
365 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
366 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
367 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
368 req->id.idiag_dport, req->id.idiag_src[3],
369 req->id.idiag_sport, req->id.idiag_if);
370 else
371 sk = inet6_lookup(net, hashinfo, NULL, 0,
372 (struct in6_addr *)req->id.idiag_dst,
373 req->id.idiag_dport,
374 (struct in6_addr *)req->id.idiag_src,
375 req->id.idiag_sport,
376 req->id.idiag_if);
377 }
378 #endif
379 else
380 return ERR_PTR(-EINVAL);
381
382 if (!sk)
383 return ERR_PTR(-ENOENT);
384
385 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
386 sock_gen_put(sk);
387 return ERR_PTR(-ENOENT);
388 }
389
390 return sk;
391 }
392 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
393
394 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
395 struct sk_buff *in_skb,
396 const struct nlmsghdr *nlh,
397 const struct inet_diag_req_v2 *req)
398 {
399 struct net *net = sock_net(in_skb->sk);
400 struct sk_buff *rep;
401 struct sock *sk;
402 int err;
403
404 sk = inet_diag_find_one_icsk(net, hashinfo, req);
405 if (IS_ERR(sk))
406 return PTR_ERR(sk);
407
408 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
409 if (!rep) {
410 err = -ENOMEM;
411 goto out;
412 }
413
414 err = sk_diag_fill(sk, rep, req,
415 sk_user_ns(NETLINK_CB(in_skb).sk),
416 NETLINK_CB(in_skb).portid,
417 nlh->nlmsg_seq, 0, nlh);
418 if (err < 0) {
419 WARN_ON(err == -EMSGSIZE);
420 nlmsg_free(rep);
421 goto out;
422 }
423 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
424 MSG_DONTWAIT);
425 if (err > 0)
426 err = 0;
427
428 out:
429 if (sk)
430 sock_gen_put(sk);
431
432 return err;
433 }
434 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
435
436 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
437 const struct nlmsghdr *nlh,
438 const struct inet_diag_req_v2 *req)
439 {
440 const struct inet_diag_handler *handler;
441 int err;
442
443 handler = inet_diag_lock_handler(req->sdiag_protocol);
444 if (IS_ERR(handler))
445 err = PTR_ERR(handler);
446 else if (cmd == SOCK_DIAG_BY_FAMILY)
447 err = handler->dump_one(in_skb, nlh, req);
448 else if (cmd == SOCK_DESTROY && handler->destroy)
449 err = handler->destroy(in_skb, req);
450 else
451 err = -EOPNOTSUPP;
452 inet_diag_unlock_handler(handler);
453
454 return err;
455 }
456
457 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
458 {
459 int words = bits >> 5;
460
461 bits &= 0x1f;
462
463 if (words) {
464 if (memcmp(a1, a2, words << 2))
465 return 0;
466 }
467 if (bits) {
468 __be32 w1, w2;
469 __be32 mask;
470
471 w1 = a1[words];
472 w2 = a2[words];
473
474 mask = htonl((0xffffffff) << (32 - bits));
475
476 if ((w1 ^ w2) & mask)
477 return 0;
478 }
479
480 return 1;
481 }
482
483 static int inet_diag_bc_run(const struct nlattr *_bc,
484 const struct inet_diag_entry *entry)
485 {
486 const void *bc = nla_data(_bc);
487 int len = nla_len(_bc);
488
489 while (len > 0) {
490 int yes = 1;
491 const struct inet_diag_bc_op *op = bc;
492
493 switch (op->code) {
494 case INET_DIAG_BC_NOP:
495 break;
496 case INET_DIAG_BC_JMP:
497 yes = 0;
498 break;
499 case INET_DIAG_BC_S_GE:
500 yes = entry->sport >= op[1].no;
501 break;
502 case INET_DIAG_BC_S_LE:
503 yes = entry->sport <= op[1].no;
504 break;
505 case INET_DIAG_BC_D_GE:
506 yes = entry->dport >= op[1].no;
507 break;
508 case INET_DIAG_BC_D_LE:
509 yes = entry->dport <= op[1].no;
510 break;
511 case INET_DIAG_BC_AUTO:
512 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
513 break;
514 case INET_DIAG_BC_S_COND:
515 case INET_DIAG_BC_D_COND: {
516 const struct inet_diag_hostcond *cond;
517 const __be32 *addr;
518
519 cond = (const struct inet_diag_hostcond *)(op + 1);
520 if (cond->port != -1 &&
521 cond->port != (op->code == INET_DIAG_BC_S_COND ?
522 entry->sport : entry->dport)) {
523 yes = 0;
524 break;
525 }
526
527 if (op->code == INET_DIAG_BC_S_COND)
528 addr = entry->saddr;
529 else
530 addr = entry->daddr;
531
532 if (cond->family != AF_UNSPEC &&
533 cond->family != entry->family) {
534 if (entry->family == AF_INET6 &&
535 cond->family == AF_INET) {
536 if (addr[0] == 0 && addr[1] == 0 &&
537 addr[2] == htonl(0xffff) &&
538 bitstring_match(addr + 3,
539 cond->addr,
540 cond->prefix_len))
541 break;
542 }
543 yes = 0;
544 break;
545 }
546
547 if (cond->prefix_len == 0)
548 break;
549 if (bitstring_match(addr, cond->addr,
550 cond->prefix_len))
551 break;
552 yes = 0;
553 break;
554 }
555 }
556
557 if (yes) {
558 len -= op->yes;
559 bc += op->yes;
560 } else {
561 len -= op->no;
562 bc += op->no;
563 }
564 }
565 return len == 0;
566 }
567
568 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
569 */
570 static void entry_fill_addrs(struct inet_diag_entry *entry,
571 const struct sock *sk)
572 {
573 #if IS_ENABLED(CONFIG_IPV6)
574 if (sk->sk_family == AF_INET6) {
575 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
576 entry->daddr = sk->sk_v6_daddr.s6_addr32;
577 } else
578 #endif
579 {
580 entry->saddr = &sk->sk_rcv_saddr;
581 entry->daddr = &sk->sk_daddr;
582 }
583 }
584
585 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
586 {
587 struct inet_sock *inet = inet_sk(sk);
588 struct inet_diag_entry entry;
589
590 if (!bc)
591 return 1;
592
593 entry.family = sk->sk_family;
594 entry_fill_addrs(&entry, sk);
595 entry.sport = inet->inet_num;
596 entry.dport = ntohs(inet->inet_dport);
597 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
598
599 return inet_diag_bc_run(bc, &entry);
600 }
601 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
602
603 static int valid_cc(const void *bc, int len, int cc)
604 {
605 while (len >= 0) {
606 const struct inet_diag_bc_op *op = bc;
607
608 if (cc > len)
609 return 0;
610 if (cc == len)
611 return 1;
612 if (op->yes < 4 || op->yes & 3)
613 return 0;
614 len -= op->yes;
615 bc += op->yes;
616 }
617 return 0;
618 }
619
620 /* Validate an inet_diag_hostcond. */
621 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
622 int *min_len)
623 {
624 struct inet_diag_hostcond *cond;
625 int addr_len;
626
627 /* Check hostcond space. */
628 *min_len += sizeof(struct inet_diag_hostcond);
629 if (len < *min_len)
630 return false;
631 cond = (struct inet_diag_hostcond *)(op + 1);
632
633 /* Check address family and address length. */
634 switch (cond->family) {
635 case AF_UNSPEC:
636 addr_len = 0;
637 break;
638 case AF_INET:
639 addr_len = sizeof(struct in_addr);
640 break;
641 case AF_INET6:
642 addr_len = sizeof(struct in6_addr);
643 break;
644 default:
645 return false;
646 }
647 *min_len += addr_len;
648 if (len < *min_len)
649 return false;
650
651 /* Check prefix length (in bits) vs address length (in bytes). */
652 if (cond->prefix_len > 8 * addr_len)
653 return false;
654
655 return true;
656 }
657
658 /* Validate a port comparison operator. */
659 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
660 int len, int *min_len)
661 {
662 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
663 *min_len += sizeof(struct inet_diag_bc_op);
664 if (len < *min_len)
665 return false;
666 return true;
667 }
668
669 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
670 {
671 const void *bc = bytecode;
672 int len = bytecode_len;
673
674 while (len > 0) {
675 int min_len = sizeof(struct inet_diag_bc_op);
676 const struct inet_diag_bc_op *op = bc;
677
678 switch (op->code) {
679 case INET_DIAG_BC_S_COND:
680 case INET_DIAG_BC_D_COND:
681 if (!valid_hostcond(bc, len, &min_len))
682 return -EINVAL;
683 break;
684 case INET_DIAG_BC_S_GE:
685 case INET_DIAG_BC_S_LE:
686 case INET_DIAG_BC_D_GE:
687 case INET_DIAG_BC_D_LE:
688 if (!valid_port_comparison(bc, len, &min_len))
689 return -EINVAL;
690 break;
691 case INET_DIAG_BC_AUTO:
692 case INET_DIAG_BC_JMP:
693 case INET_DIAG_BC_NOP:
694 break;
695 default:
696 return -EINVAL;
697 }
698
699 if (op->code != INET_DIAG_BC_NOP) {
700 if (op->no < min_len || op->no > len + 4 || op->no & 3)
701 return -EINVAL;
702 if (op->no < len &&
703 !valid_cc(bytecode, bytecode_len, len - op->no))
704 return -EINVAL;
705 }
706
707 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
708 return -EINVAL;
709 bc += op->yes;
710 len -= op->yes;
711 }
712 return len == 0 ? 0 : -EINVAL;
713 }
714
715 static int inet_csk_diag_dump(struct sock *sk,
716 struct sk_buff *skb,
717 struct netlink_callback *cb,
718 const struct inet_diag_req_v2 *r,
719 const struct nlattr *bc)
720 {
721 if (!inet_diag_bc_sk(bc, sk))
722 return 0;
723
724 return inet_csk_diag_fill(sk, skb, r,
725 sk_user_ns(NETLINK_CB(cb->skb).sk),
726 NETLINK_CB(cb->skb).portid,
727 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
728 }
729
730 static void twsk_build_assert(void)
731 {
732 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
733 offsetof(struct sock, sk_family));
734
735 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
736 offsetof(struct inet_sock, inet_num));
737
738 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
739 offsetof(struct inet_sock, inet_dport));
740
741 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
742 offsetof(struct inet_sock, inet_rcv_saddr));
743
744 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
745 offsetof(struct inet_sock, inet_daddr));
746
747 #if IS_ENABLED(CONFIG_IPV6)
748 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
749 offsetof(struct sock, sk_v6_rcv_saddr));
750
751 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
752 offsetof(struct sock, sk_v6_daddr));
753 #endif
754 }
755
756 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
757 struct netlink_callback *cb,
758 const struct inet_diag_req_v2 *r, struct nlattr *bc)
759 {
760 struct net *net = sock_net(skb->sk);
761 int i, num, s_i, s_num;
762 u32 idiag_states = r->idiag_states;
763
764 if (idiag_states & TCPF_SYN_RECV)
765 idiag_states |= TCPF_NEW_SYN_RECV;
766 s_i = cb->args[1];
767 s_num = num = cb->args[2];
768
769 if (cb->args[0] == 0) {
770 if (!(idiag_states & TCPF_LISTEN))
771 goto skip_listen_ht;
772
773 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
774 struct inet_listen_hashbucket *ilb;
775 struct hlist_nulls_node *node;
776 struct sock *sk;
777
778 num = 0;
779 ilb = &hashinfo->listening_hash[i];
780 spin_lock_bh(&ilb->lock);
781 sk_nulls_for_each(sk, node, &ilb->head) {
782 struct inet_sock *inet = inet_sk(sk);
783
784 if (!net_eq(sock_net(sk), net))
785 continue;
786
787 if (num < s_num) {
788 num++;
789 continue;
790 }
791
792 if (r->sdiag_family != AF_UNSPEC &&
793 sk->sk_family != r->sdiag_family)
794 goto next_listen;
795
796 if (r->id.idiag_sport != inet->inet_sport &&
797 r->id.idiag_sport)
798 goto next_listen;
799
800 if (r->id.idiag_dport ||
801 cb->args[3] > 0)
802 goto next_listen;
803
804 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
805 spin_unlock_bh(&ilb->lock);
806 goto done;
807 }
808
809 next_listen:
810 cb->args[3] = 0;
811 cb->args[4] = 0;
812 ++num;
813 }
814 spin_unlock_bh(&ilb->lock);
815
816 s_num = 0;
817 cb->args[3] = 0;
818 cb->args[4] = 0;
819 }
820 skip_listen_ht:
821 cb->args[0] = 1;
822 s_i = num = s_num = 0;
823 }
824
825 if (!(idiag_states & ~TCPF_LISTEN))
826 goto out;
827
828 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
829 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
830 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
831 struct hlist_nulls_node *node;
832 struct sock *sk;
833
834 num = 0;
835
836 if (hlist_nulls_empty(&head->chain))
837 continue;
838
839 if (i > s_i)
840 s_num = 0;
841
842 spin_lock_bh(lock);
843 sk_nulls_for_each(sk, node, &head->chain) {
844 int state, res;
845
846 if (!net_eq(sock_net(sk), net))
847 continue;
848 if (num < s_num)
849 goto next_normal;
850 state = (sk->sk_state == TCP_TIME_WAIT) ?
851 inet_twsk(sk)->tw_substate : sk->sk_state;
852 if (!(idiag_states & (1 << state)))
853 goto next_normal;
854 if (r->sdiag_family != AF_UNSPEC &&
855 sk->sk_family != r->sdiag_family)
856 goto next_normal;
857 if (r->id.idiag_sport != htons(sk->sk_num) &&
858 r->id.idiag_sport)
859 goto next_normal;
860 if (r->id.idiag_dport != sk->sk_dport &&
861 r->id.idiag_dport)
862 goto next_normal;
863 twsk_build_assert();
864
865 if (!inet_diag_bc_sk(bc, sk))
866 goto next_normal;
867
868 res = sk_diag_fill(sk, skb, r,
869 sk_user_ns(NETLINK_CB(cb->skb).sk),
870 NETLINK_CB(cb->skb).portid,
871 cb->nlh->nlmsg_seq, NLM_F_MULTI,
872 cb->nlh);
873 if (res < 0) {
874 spin_unlock_bh(lock);
875 goto done;
876 }
877 next_normal:
878 ++num;
879 }
880
881 spin_unlock_bh(lock);
882 cond_resched();
883 }
884
885 done:
886 cb->args[1] = i;
887 cb->args[2] = num;
888 out:
889 ;
890 }
891 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
892
893 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
894 const struct inet_diag_req_v2 *r,
895 struct nlattr *bc)
896 {
897 const struct inet_diag_handler *handler;
898 int err = 0;
899
900 handler = inet_diag_lock_handler(r->sdiag_protocol);
901 if (!IS_ERR(handler))
902 handler->dump(skb, cb, r, bc);
903 else
904 err = PTR_ERR(handler);
905 inet_diag_unlock_handler(handler);
906
907 return err ? : skb->len;
908 }
909
910 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
911 {
912 int hdrlen = sizeof(struct inet_diag_req_v2);
913 struct nlattr *bc = NULL;
914
915 if (nlmsg_attrlen(cb->nlh, hdrlen))
916 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
917
918 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
919 }
920
921 static int inet_diag_type2proto(int type)
922 {
923 switch (type) {
924 case TCPDIAG_GETSOCK:
925 return IPPROTO_TCP;
926 case DCCPDIAG_GETSOCK:
927 return IPPROTO_DCCP;
928 default:
929 return 0;
930 }
931 }
932
933 static int inet_diag_dump_compat(struct sk_buff *skb,
934 struct netlink_callback *cb)
935 {
936 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
937 int hdrlen = sizeof(struct inet_diag_req);
938 struct inet_diag_req_v2 req;
939 struct nlattr *bc = NULL;
940
941 req.sdiag_family = AF_UNSPEC; /* compatibility */
942 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
943 req.idiag_ext = rc->idiag_ext;
944 req.idiag_states = rc->idiag_states;
945 req.id = rc->id;
946
947 if (nlmsg_attrlen(cb->nlh, hdrlen))
948 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
949
950 return __inet_diag_dump(skb, cb, &req, bc);
951 }
952
953 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
954 const struct nlmsghdr *nlh)
955 {
956 struct inet_diag_req *rc = nlmsg_data(nlh);
957 struct inet_diag_req_v2 req;
958
959 req.sdiag_family = rc->idiag_family;
960 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
961 req.idiag_ext = rc->idiag_ext;
962 req.idiag_states = rc->idiag_states;
963 req.id = rc->id;
964
965 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
966 }
967
968 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
969 {
970 int hdrlen = sizeof(struct inet_diag_req);
971 struct net *net = sock_net(skb->sk);
972
973 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
974 nlmsg_len(nlh) < hdrlen)
975 return -EINVAL;
976
977 if (nlh->nlmsg_flags & NLM_F_DUMP) {
978 if (nlmsg_attrlen(nlh, hdrlen)) {
979 struct nlattr *attr;
980
981 attr = nlmsg_find_attr(nlh, hdrlen,
982 INET_DIAG_REQ_BYTECODE);
983 if (!attr ||
984 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
985 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
986 return -EINVAL;
987 }
988 {
989 struct netlink_dump_control c = {
990 .dump = inet_diag_dump_compat,
991 };
992 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
993 }
994 }
995
996 return inet_diag_get_exact_compat(skb, nlh);
997 }
998
999 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1000 {
1001 int hdrlen = sizeof(struct inet_diag_req_v2);
1002 struct net *net = sock_net(skb->sk);
1003
1004 if (nlmsg_len(h) < hdrlen)
1005 return -EINVAL;
1006
1007 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1008 h->nlmsg_flags & NLM_F_DUMP) {
1009 if (nlmsg_attrlen(h, hdrlen)) {
1010 struct nlattr *attr;
1011
1012 attr = nlmsg_find_attr(h, hdrlen,
1013 INET_DIAG_REQ_BYTECODE);
1014 if (!attr ||
1015 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1016 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1017 return -EINVAL;
1018 }
1019 {
1020 struct netlink_dump_control c = {
1021 .dump = inet_diag_dump,
1022 };
1023 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1024 }
1025 }
1026
1027 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1028 }
1029
1030 static
1031 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1032 {
1033 const struct inet_diag_handler *handler;
1034 struct nlmsghdr *nlh;
1035 struct nlattr *attr;
1036 struct inet_diag_msg *r;
1037 void *info = NULL;
1038 int err = 0;
1039
1040 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1041 if (!nlh)
1042 return -ENOMEM;
1043
1044 r = nlmsg_data(nlh);
1045 memset(r, 0, sizeof(*r));
1046 inet_diag_msg_common_fill(r, sk);
1047 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1048 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1049 r->idiag_state = sk->sk_state;
1050
1051 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1052 nlmsg_cancel(skb, nlh);
1053 return err;
1054 }
1055
1056 handler = inet_diag_lock_handler(sk->sk_protocol);
1057 if (IS_ERR(handler)) {
1058 inet_diag_unlock_handler(handler);
1059 nlmsg_cancel(skb, nlh);
1060 return PTR_ERR(handler);
1061 }
1062
1063 attr = handler->idiag_info_size
1064 ? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size)
1065 : NULL;
1066 if (attr)
1067 info = nla_data(attr);
1068
1069 handler->idiag_get_info(sk, r, info);
1070 inet_diag_unlock_handler(handler);
1071
1072 nlmsg_end(skb, nlh);
1073 return 0;
1074 }
1075
1076 static const struct sock_diag_handler inet_diag_handler = {
1077 .family = AF_INET,
1078 .dump = inet_diag_handler_cmd,
1079 .get_info = inet_diag_handler_get_info,
1080 .destroy = inet_diag_handler_cmd,
1081 };
1082
1083 static const struct sock_diag_handler inet6_diag_handler = {
1084 .family = AF_INET6,
1085 .dump = inet_diag_handler_cmd,
1086 .get_info = inet_diag_handler_get_info,
1087 .destroy = inet_diag_handler_cmd,
1088 };
1089
1090 int inet_diag_register(const struct inet_diag_handler *h)
1091 {
1092 const __u16 type = h->idiag_type;
1093 int err = -EINVAL;
1094
1095 if (type >= IPPROTO_MAX)
1096 goto out;
1097
1098 mutex_lock(&inet_diag_table_mutex);
1099 err = -EEXIST;
1100 if (!inet_diag_table[type]) {
1101 inet_diag_table[type] = h;
1102 err = 0;
1103 }
1104 mutex_unlock(&inet_diag_table_mutex);
1105 out:
1106 return err;
1107 }
1108 EXPORT_SYMBOL_GPL(inet_diag_register);
1109
1110 void inet_diag_unregister(const struct inet_diag_handler *h)
1111 {
1112 const __u16 type = h->idiag_type;
1113
1114 if (type >= IPPROTO_MAX)
1115 return;
1116
1117 mutex_lock(&inet_diag_table_mutex);
1118 inet_diag_table[type] = NULL;
1119 mutex_unlock(&inet_diag_table_mutex);
1120 }
1121 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1122
1123 static int __init inet_diag_init(void)
1124 {
1125 const int inet_diag_table_size = (IPPROTO_MAX *
1126 sizeof(struct inet_diag_handler *));
1127 int err = -ENOMEM;
1128
1129 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1130 if (!inet_diag_table)
1131 goto out;
1132
1133 err = sock_diag_register(&inet_diag_handler);
1134 if (err)
1135 goto out_free_nl;
1136
1137 err = sock_diag_register(&inet6_diag_handler);
1138 if (err)
1139 goto out_free_inet;
1140
1141 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1142 out:
1143 return err;
1144
1145 out_free_inet:
1146 sock_diag_unregister(&inet_diag_handler);
1147 out_free_nl:
1148 kfree(inet_diag_table);
1149 goto out;
1150 }
1151
1152 static void __exit inet_diag_exit(void)
1153 {
1154 sock_diag_unregister(&inet6_diag_handler);
1155 sock_diag_unregister(&inet_diag_handler);
1156 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1157 kfree(inet_diag_table);
1158 }
1159
1160 module_init(inet_diag_init);
1161 module_exit(inet_diag_exit);
1162 MODULE_LICENSE("GPL");
1163 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1164 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux with added FPC-III support