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Merge remote-tracking branch 'keys/keys-next'
[deliverable/linux.git] / net / ipv4 / inet_diag.c
1 /*
2 * inet_diag.c Module for monitoring INET transport protocols sockets.
3 *
4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/fcntl.h>
16 #include <linux/random.h>
17 #include <linux/slab.h>
18 #include <linux/cache.h>
19 #include <linux/init.h>
20 #include <linux/time.h>
21
22 #include <net/icmp.h>
23 #include <net/tcp.h>
24 #include <net/ipv6.h>
25 #include <net/inet_common.h>
26 #include <net/inet_connection_sock.h>
27 #include <net/inet_hashtables.h>
28 #include <net/inet_timewait_sock.h>
29 #include <net/inet6_hashtables.h>
30 #include <net/netlink.h>
31
32 #include <linux/inet.h>
33 #include <linux/stddef.h>
34
35 #include <linux/inet_diag.h>
36 #include <linux/sock_diag.h>
37
38 static const struct inet_diag_handler **inet_diag_table;
39
40 struct inet_diag_entry {
41 const __be32 *saddr;
42 const __be32 *daddr;
43 u16 sport;
44 u16 dport;
45 u16 family;
46 u16 userlocks;
47 u32 ifindex;
48 u32 mark;
49 };
50
51 static DEFINE_MUTEX(inet_diag_table_mutex);
52
53 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
54 {
55 if (!inet_diag_table[proto])
56 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
57 NETLINK_SOCK_DIAG, AF_INET, proto);
58
59 mutex_lock(&inet_diag_table_mutex);
60 if (!inet_diag_table[proto])
61 return ERR_PTR(-ENOENT);
62
63 return inet_diag_table[proto];
64 }
65
66 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
67 {
68 mutex_unlock(&inet_diag_table_mutex);
69 }
70
71 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
72 {
73 r->idiag_family = sk->sk_family;
74
75 r->id.idiag_sport = htons(sk->sk_num);
76 r->id.idiag_dport = sk->sk_dport;
77 r->id.idiag_if = sk->sk_bound_dev_if;
78 sock_diag_save_cookie(sk, r->id.idiag_cookie);
79
80 #if IS_ENABLED(CONFIG_IPV6)
81 if (sk->sk_family == AF_INET6) {
82 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
83 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
84 } else
85 #endif
86 {
87 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
88 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
89
90 r->id.idiag_src[0] = sk->sk_rcv_saddr;
91 r->id.idiag_dst[0] = sk->sk_daddr;
92 }
93 }
94 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
95
96 static size_t inet_sk_attr_size(void)
97 {
98 return nla_total_size(sizeof(struct tcp_info))
99 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
100 + nla_total_size(1) /* INET_DIAG_TOS */
101 + nla_total_size(1) /* INET_DIAG_TCLASS */
102 + nla_total_size(4) /* INET_DIAG_MARK */
103 + nla_total_size(sizeof(struct inet_diag_meminfo))
104 + nla_total_size(sizeof(struct inet_diag_msg))
105 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
106 + nla_total_size(TCP_CA_NAME_MAX)
107 + nla_total_size(sizeof(struct tcpvegas_info))
108 + 64;
109 }
110
111 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
112 struct inet_diag_msg *r, int ext,
113 struct user_namespace *user_ns,
114 bool net_admin)
115 {
116 const struct inet_sock *inet = inet_sk(sk);
117
118 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
119 goto errout;
120
121 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
122 * hence this needs to be included regardless of socket family.
123 */
124 if (ext & (1 << (INET_DIAG_TOS - 1)))
125 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
126 goto errout;
127
128 #if IS_ENABLED(CONFIG_IPV6)
129 if (r->idiag_family == AF_INET6) {
130 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
131 if (nla_put_u8(skb, INET_DIAG_TCLASS,
132 inet6_sk(sk)->tclass) < 0)
133 goto errout;
134
135 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
136 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
137 goto errout;
138 }
139 #endif
140
141 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
142 goto errout;
143
144 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
145 r->idiag_inode = sock_i_ino(sk);
146
147 return 0;
148 errout:
149 return 1;
150 }
151 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
152
153 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
154 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
155 struct user_namespace *user_ns,
156 u32 portid, u32 seq, u16 nlmsg_flags,
157 const struct nlmsghdr *unlh,
158 bool net_admin)
159 {
160 const struct tcp_congestion_ops *ca_ops;
161 const struct inet_diag_handler *handler;
162 int ext = req->idiag_ext;
163 struct inet_diag_msg *r;
164 struct nlmsghdr *nlh;
165 struct nlattr *attr;
166 void *info = NULL;
167
168 handler = inet_diag_table[req->sdiag_protocol];
169 BUG_ON(!handler);
170
171 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
172 nlmsg_flags);
173 if (!nlh)
174 return -EMSGSIZE;
175
176 r = nlmsg_data(nlh);
177 BUG_ON(!sk_fullsock(sk));
178
179 inet_diag_msg_common_fill(r, sk);
180 r->idiag_state = sk->sk_state;
181 r->idiag_timer = 0;
182 r->idiag_retrans = 0;
183
184 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
185 goto errout;
186
187 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
188 struct inet_diag_meminfo minfo = {
189 .idiag_rmem = sk_rmem_alloc_get(sk),
190 .idiag_wmem = sk->sk_wmem_queued,
191 .idiag_fmem = sk->sk_forward_alloc,
192 .idiag_tmem = sk_wmem_alloc_get(sk),
193 };
194
195 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
196 goto errout;
197 }
198
199 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
200 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
201 goto errout;
202
203 if (!icsk) {
204 handler->idiag_get_info(sk, r, NULL);
205 goto out;
206 }
207
208 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
209 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
210 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
211 r->idiag_timer = 1;
212 r->idiag_retrans = icsk->icsk_retransmits;
213 r->idiag_expires =
214 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
215 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
216 r->idiag_timer = 4;
217 r->idiag_retrans = icsk->icsk_probes_out;
218 r->idiag_expires =
219 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
220 } else if (timer_pending(&sk->sk_timer)) {
221 r->idiag_timer = 2;
222 r->idiag_retrans = icsk->icsk_probes_out;
223 r->idiag_expires =
224 jiffies_to_msecs(sk->sk_timer.expires - jiffies);
225 } else {
226 r->idiag_timer = 0;
227 r->idiag_expires = 0;
228 }
229
230 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
231 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
232 handler->idiag_info_size,
233 INET_DIAG_PAD);
234 if (!attr)
235 goto errout;
236
237 info = nla_data(attr);
238 }
239
240 if (ext & (1 << (INET_DIAG_CONG - 1))) {
241 int err = 0;
242
243 rcu_read_lock();
244 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
245 if (ca_ops)
246 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
247 rcu_read_unlock();
248 if (err < 0)
249 goto errout;
250 }
251
252 handler->idiag_get_info(sk, r, info);
253
254 if (sk->sk_state < TCP_TIME_WAIT) {
255 union tcp_cc_info info;
256 size_t sz = 0;
257 int attr;
258
259 rcu_read_lock();
260 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
261 if (ca_ops && ca_ops->get_info)
262 sz = ca_ops->get_info(sk, ext, &attr, &info);
263 rcu_read_unlock();
264 if (sz && nla_put(skb, attr, sz, &info) < 0)
265 goto errout;
266 }
267
268 out:
269 nlmsg_end(skb, nlh);
270 return 0;
271
272 errout:
273 nlmsg_cancel(skb, nlh);
274 return -EMSGSIZE;
275 }
276 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
277
278 static int inet_csk_diag_fill(struct sock *sk,
279 struct sk_buff *skb,
280 const struct inet_diag_req_v2 *req,
281 struct user_namespace *user_ns,
282 u32 portid, u32 seq, u16 nlmsg_flags,
283 const struct nlmsghdr *unlh,
284 bool net_admin)
285 {
286 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
287 portid, seq, nlmsg_flags, unlh, net_admin);
288 }
289
290 static int inet_twsk_diag_fill(struct sock *sk,
291 struct sk_buff *skb,
292 u32 portid, u32 seq, u16 nlmsg_flags,
293 const struct nlmsghdr *unlh)
294 {
295 struct inet_timewait_sock *tw = inet_twsk(sk);
296 struct inet_diag_msg *r;
297 struct nlmsghdr *nlh;
298 long tmo;
299
300 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
301 nlmsg_flags);
302 if (!nlh)
303 return -EMSGSIZE;
304
305 r = nlmsg_data(nlh);
306 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
307
308 tmo = tw->tw_timer.expires - jiffies;
309 if (tmo < 0)
310 tmo = 0;
311
312 inet_diag_msg_common_fill(r, sk);
313 r->idiag_retrans = 0;
314
315 r->idiag_state = tw->tw_substate;
316 r->idiag_timer = 3;
317 r->idiag_expires = jiffies_to_msecs(tmo);
318 r->idiag_rqueue = 0;
319 r->idiag_wqueue = 0;
320 r->idiag_uid = 0;
321 r->idiag_inode = 0;
322
323 nlmsg_end(skb, nlh);
324 return 0;
325 }
326
327 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
328 u32 portid, u32 seq, u16 nlmsg_flags,
329 const struct nlmsghdr *unlh, bool net_admin)
330 {
331 struct request_sock *reqsk = inet_reqsk(sk);
332 struct inet_diag_msg *r;
333 struct nlmsghdr *nlh;
334 long tmo;
335
336 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
337 nlmsg_flags);
338 if (!nlh)
339 return -EMSGSIZE;
340
341 r = nlmsg_data(nlh);
342 inet_diag_msg_common_fill(r, sk);
343 r->idiag_state = TCP_SYN_RECV;
344 r->idiag_timer = 1;
345 r->idiag_retrans = reqsk->num_retrans;
346
347 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
348 offsetof(struct sock, sk_cookie));
349
350 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
351 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
352 r->idiag_rqueue = 0;
353 r->idiag_wqueue = 0;
354 r->idiag_uid = 0;
355 r->idiag_inode = 0;
356
357 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
358 inet_rsk(reqsk)->ir_mark))
359 return -EMSGSIZE;
360
361 nlmsg_end(skb, nlh);
362 return 0;
363 }
364
365 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
366 const struct inet_diag_req_v2 *r,
367 struct user_namespace *user_ns,
368 u32 portid, u32 seq, u16 nlmsg_flags,
369 const struct nlmsghdr *unlh, bool net_admin)
370 {
371 if (sk->sk_state == TCP_TIME_WAIT)
372 return inet_twsk_diag_fill(sk, skb, portid, seq,
373 nlmsg_flags, unlh);
374
375 if (sk->sk_state == TCP_NEW_SYN_RECV)
376 return inet_req_diag_fill(sk, skb, portid, seq,
377 nlmsg_flags, unlh, net_admin);
378
379 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
380 nlmsg_flags, unlh, net_admin);
381 }
382
383 struct sock *inet_diag_find_one_icsk(struct net *net,
384 struct inet_hashinfo *hashinfo,
385 const struct inet_diag_req_v2 *req)
386 {
387 struct sock *sk;
388
389 rcu_read_lock();
390 if (req->sdiag_family == AF_INET)
391 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
392 req->id.idiag_dport, req->id.idiag_src[0],
393 req->id.idiag_sport, req->id.idiag_if);
394 #if IS_ENABLED(CONFIG_IPV6)
395 else if (req->sdiag_family == AF_INET6) {
396 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
397 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
398 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
399 req->id.idiag_dport, req->id.idiag_src[3],
400 req->id.idiag_sport, req->id.idiag_if);
401 else
402 sk = inet6_lookup(net, hashinfo, NULL, 0,
403 (struct in6_addr *)req->id.idiag_dst,
404 req->id.idiag_dport,
405 (struct in6_addr *)req->id.idiag_src,
406 req->id.idiag_sport,
407 req->id.idiag_if);
408 }
409 #endif
410 else {
411 rcu_read_unlock();
412 return ERR_PTR(-EINVAL);
413 }
414 rcu_read_unlock();
415 if (!sk)
416 return ERR_PTR(-ENOENT);
417
418 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
419 sock_gen_put(sk);
420 return ERR_PTR(-ENOENT);
421 }
422
423 return sk;
424 }
425 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
426
427 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
428 struct sk_buff *in_skb,
429 const struct nlmsghdr *nlh,
430 const struct inet_diag_req_v2 *req)
431 {
432 struct net *net = sock_net(in_skb->sk);
433 struct sk_buff *rep;
434 struct sock *sk;
435 int err;
436
437 sk = inet_diag_find_one_icsk(net, hashinfo, req);
438 if (IS_ERR(sk))
439 return PTR_ERR(sk);
440
441 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
442 if (!rep) {
443 err = -ENOMEM;
444 goto out;
445 }
446
447 err = sk_diag_fill(sk, rep, req,
448 sk_user_ns(NETLINK_CB(in_skb).sk),
449 NETLINK_CB(in_skb).portid,
450 nlh->nlmsg_seq, 0, nlh,
451 netlink_net_capable(in_skb, CAP_NET_ADMIN));
452 if (err < 0) {
453 WARN_ON(err == -EMSGSIZE);
454 nlmsg_free(rep);
455 goto out;
456 }
457 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
458 MSG_DONTWAIT);
459 if (err > 0)
460 err = 0;
461
462 out:
463 if (sk)
464 sock_gen_put(sk);
465
466 return err;
467 }
468 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
469
470 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
471 const struct nlmsghdr *nlh,
472 const struct inet_diag_req_v2 *req)
473 {
474 const struct inet_diag_handler *handler;
475 int err;
476
477 handler = inet_diag_lock_handler(req->sdiag_protocol);
478 if (IS_ERR(handler))
479 err = PTR_ERR(handler);
480 else if (cmd == SOCK_DIAG_BY_FAMILY)
481 err = handler->dump_one(in_skb, nlh, req);
482 else if (cmd == SOCK_DESTROY && handler->destroy)
483 err = handler->destroy(in_skb, req);
484 else
485 err = -EOPNOTSUPP;
486 inet_diag_unlock_handler(handler);
487
488 return err;
489 }
490
491 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
492 {
493 int words = bits >> 5;
494
495 bits &= 0x1f;
496
497 if (words) {
498 if (memcmp(a1, a2, words << 2))
499 return 0;
500 }
501 if (bits) {
502 __be32 w1, w2;
503 __be32 mask;
504
505 w1 = a1[words];
506 w2 = a2[words];
507
508 mask = htonl((0xffffffff) << (32 - bits));
509
510 if ((w1 ^ w2) & mask)
511 return 0;
512 }
513
514 return 1;
515 }
516
517 static int inet_diag_bc_run(const struct nlattr *_bc,
518 const struct inet_diag_entry *entry)
519 {
520 const void *bc = nla_data(_bc);
521 int len = nla_len(_bc);
522
523 while (len > 0) {
524 int yes = 1;
525 const struct inet_diag_bc_op *op = bc;
526
527 switch (op->code) {
528 case INET_DIAG_BC_NOP:
529 break;
530 case INET_DIAG_BC_JMP:
531 yes = 0;
532 break;
533 case INET_DIAG_BC_S_GE:
534 yes = entry->sport >= op[1].no;
535 break;
536 case INET_DIAG_BC_S_LE:
537 yes = entry->sport <= op[1].no;
538 break;
539 case INET_DIAG_BC_D_GE:
540 yes = entry->dport >= op[1].no;
541 break;
542 case INET_DIAG_BC_D_LE:
543 yes = entry->dport <= op[1].no;
544 break;
545 case INET_DIAG_BC_AUTO:
546 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
547 break;
548 case INET_DIAG_BC_S_COND:
549 case INET_DIAG_BC_D_COND: {
550 const struct inet_diag_hostcond *cond;
551 const __be32 *addr;
552
553 cond = (const struct inet_diag_hostcond *)(op + 1);
554 if (cond->port != -1 &&
555 cond->port != (op->code == INET_DIAG_BC_S_COND ?
556 entry->sport : entry->dport)) {
557 yes = 0;
558 break;
559 }
560
561 if (op->code == INET_DIAG_BC_S_COND)
562 addr = entry->saddr;
563 else
564 addr = entry->daddr;
565
566 if (cond->family != AF_UNSPEC &&
567 cond->family != entry->family) {
568 if (entry->family == AF_INET6 &&
569 cond->family == AF_INET) {
570 if (addr[0] == 0 && addr[1] == 0 &&
571 addr[2] == htonl(0xffff) &&
572 bitstring_match(addr + 3,
573 cond->addr,
574 cond->prefix_len))
575 break;
576 }
577 yes = 0;
578 break;
579 }
580
581 if (cond->prefix_len == 0)
582 break;
583 if (bitstring_match(addr, cond->addr,
584 cond->prefix_len))
585 break;
586 yes = 0;
587 break;
588 }
589 case INET_DIAG_BC_DEV_COND: {
590 u32 ifindex;
591
592 ifindex = *((const u32 *)(op + 1));
593 if (ifindex != entry->ifindex)
594 yes = 0;
595 break;
596 }
597 case INET_DIAG_BC_MARK_COND: {
598 struct inet_diag_markcond *cond;
599
600 cond = (struct inet_diag_markcond *)(op + 1);
601 if ((entry->mark & cond->mask) != cond->mark)
602 yes = 0;
603 break;
604 }
605 }
606
607 if (yes) {
608 len -= op->yes;
609 bc += op->yes;
610 } else {
611 len -= op->no;
612 bc += op->no;
613 }
614 }
615 return len == 0;
616 }
617
618 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
619 */
620 static void entry_fill_addrs(struct inet_diag_entry *entry,
621 const struct sock *sk)
622 {
623 #if IS_ENABLED(CONFIG_IPV6)
624 if (sk->sk_family == AF_INET6) {
625 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
626 entry->daddr = sk->sk_v6_daddr.s6_addr32;
627 } else
628 #endif
629 {
630 entry->saddr = &sk->sk_rcv_saddr;
631 entry->daddr = &sk->sk_daddr;
632 }
633 }
634
635 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
636 {
637 struct inet_sock *inet = inet_sk(sk);
638 struct inet_diag_entry entry;
639
640 if (!bc)
641 return 1;
642
643 entry.family = sk->sk_family;
644 entry_fill_addrs(&entry, sk);
645 entry.sport = inet->inet_num;
646 entry.dport = ntohs(inet->inet_dport);
647 entry.ifindex = sk->sk_bound_dev_if;
648 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
649 if (sk_fullsock(sk))
650 entry.mark = sk->sk_mark;
651 else if (sk->sk_state == TCP_NEW_SYN_RECV)
652 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
653 else
654 entry.mark = 0;
655
656 return inet_diag_bc_run(bc, &entry);
657 }
658 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
659
660 static int valid_cc(const void *bc, int len, int cc)
661 {
662 while (len >= 0) {
663 const struct inet_diag_bc_op *op = bc;
664
665 if (cc > len)
666 return 0;
667 if (cc == len)
668 return 1;
669 if (op->yes < 4 || op->yes & 3)
670 return 0;
671 len -= op->yes;
672 bc += op->yes;
673 }
674 return 0;
675 }
676
677 /* data is u32 ifindex */
678 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
679 int *min_len)
680 {
681 /* Check ifindex space. */
682 *min_len += sizeof(u32);
683 if (len < *min_len)
684 return false;
685
686 return true;
687 }
688 /* Validate an inet_diag_hostcond. */
689 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
690 int *min_len)
691 {
692 struct inet_diag_hostcond *cond;
693 int addr_len;
694
695 /* Check hostcond space. */
696 *min_len += sizeof(struct inet_diag_hostcond);
697 if (len < *min_len)
698 return false;
699 cond = (struct inet_diag_hostcond *)(op + 1);
700
701 /* Check address family and address length. */
702 switch (cond->family) {
703 case AF_UNSPEC:
704 addr_len = 0;
705 break;
706 case AF_INET:
707 addr_len = sizeof(struct in_addr);
708 break;
709 case AF_INET6:
710 addr_len = sizeof(struct in6_addr);
711 break;
712 default:
713 return false;
714 }
715 *min_len += addr_len;
716 if (len < *min_len)
717 return false;
718
719 /* Check prefix length (in bits) vs address length (in bytes). */
720 if (cond->prefix_len > 8 * addr_len)
721 return false;
722
723 return true;
724 }
725
726 /* Validate a port comparison operator. */
727 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
728 int len, int *min_len)
729 {
730 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
731 *min_len += sizeof(struct inet_diag_bc_op);
732 if (len < *min_len)
733 return false;
734 return true;
735 }
736
737 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
738 int *min_len)
739 {
740 *min_len += sizeof(struct inet_diag_markcond);
741 return len >= *min_len;
742 }
743
744 static int inet_diag_bc_audit(const struct nlattr *attr,
745 const struct sk_buff *skb)
746 {
747 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
748 const void *bytecode, *bc;
749 int bytecode_len, len;
750
751 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
752 return -EINVAL;
753
754 bytecode = bc = nla_data(attr);
755 len = bytecode_len = nla_len(attr);
756
757 while (len > 0) {
758 int min_len = sizeof(struct inet_diag_bc_op);
759 const struct inet_diag_bc_op *op = bc;
760
761 switch (op->code) {
762 case INET_DIAG_BC_S_COND:
763 case INET_DIAG_BC_D_COND:
764 if (!valid_hostcond(bc, len, &min_len))
765 return -EINVAL;
766 break;
767 case INET_DIAG_BC_DEV_COND:
768 if (!valid_devcond(bc, len, &min_len))
769 return -EINVAL;
770 break;
771 case INET_DIAG_BC_S_GE:
772 case INET_DIAG_BC_S_LE:
773 case INET_DIAG_BC_D_GE:
774 case INET_DIAG_BC_D_LE:
775 if (!valid_port_comparison(bc, len, &min_len))
776 return -EINVAL;
777 break;
778 case INET_DIAG_BC_MARK_COND:
779 if (!net_admin)
780 return -EPERM;
781 if (!valid_markcond(bc, len, &min_len))
782 return -EINVAL;
783 break;
784 case INET_DIAG_BC_AUTO:
785 case INET_DIAG_BC_JMP:
786 case INET_DIAG_BC_NOP:
787 break;
788 default:
789 return -EINVAL;
790 }
791
792 if (op->code != INET_DIAG_BC_NOP) {
793 if (op->no < min_len || op->no > len + 4 || op->no & 3)
794 return -EINVAL;
795 if (op->no < len &&
796 !valid_cc(bytecode, bytecode_len, len - op->no))
797 return -EINVAL;
798 }
799
800 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
801 return -EINVAL;
802 bc += op->yes;
803 len -= op->yes;
804 }
805 return len == 0 ? 0 : -EINVAL;
806 }
807
808 static int inet_csk_diag_dump(struct sock *sk,
809 struct sk_buff *skb,
810 struct netlink_callback *cb,
811 const struct inet_diag_req_v2 *r,
812 const struct nlattr *bc,
813 bool net_admin)
814 {
815 if (!inet_diag_bc_sk(bc, sk))
816 return 0;
817
818 return inet_csk_diag_fill(sk, skb, r,
819 sk_user_ns(NETLINK_CB(cb->skb).sk),
820 NETLINK_CB(cb->skb).portid,
821 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
822 net_admin);
823 }
824
825 static void twsk_build_assert(void)
826 {
827 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
828 offsetof(struct sock, sk_family));
829
830 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
831 offsetof(struct inet_sock, inet_num));
832
833 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
834 offsetof(struct inet_sock, inet_dport));
835
836 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
837 offsetof(struct inet_sock, inet_rcv_saddr));
838
839 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
840 offsetof(struct inet_sock, inet_daddr));
841
842 #if IS_ENABLED(CONFIG_IPV6)
843 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
844 offsetof(struct sock, sk_v6_rcv_saddr));
845
846 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
847 offsetof(struct sock, sk_v6_daddr));
848 #endif
849 }
850
851 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
852 struct netlink_callback *cb,
853 const struct inet_diag_req_v2 *r, struct nlattr *bc)
854 {
855 struct net *net = sock_net(skb->sk);
856 int i, num, s_i, s_num;
857 u32 idiag_states = r->idiag_states;
858 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
859
860 if (idiag_states & TCPF_SYN_RECV)
861 idiag_states |= TCPF_NEW_SYN_RECV;
862 s_i = cb->args[1];
863 s_num = num = cb->args[2];
864
865 if (cb->args[0] == 0) {
866 if (!(idiag_states & TCPF_LISTEN))
867 goto skip_listen_ht;
868
869 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
870 struct inet_listen_hashbucket *ilb;
871 struct sock *sk;
872
873 num = 0;
874 ilb = &hashinfo->listening_hash[i];
875 spin_lock_bh(&ilb->lock);
876 sk_for_each(sk, &ilb->head) {
877 struct inet_sock *inet = inet_sk(sk);
878
879 if (!net_eq(sock_net(sk), net))
880 continue;
881
882 if (num < s_num) {
883 num++;
884 continue;
885 }
886
887 if (r->sdiag_family != AF_UNSPEC &&
888 sk->sk_family != r->sdiag_family)
889 goto next_listen;
890
891 if (r->id.idiag_sport != inet->inet_sport &&
892 r->id.idiag_sport)
893 goto next_listen;
894
895 if (r->id.idiag_dport ||
896 cb->args[3] > 0)
897 goto next_listen;
898
899 if (inet_csk_diag_dump(sk, skb, cb, r,
900 bc, net_admin) < 0) {
901 spin_unlock_bh(&ilb->lock);
902 goto done;
903 }
904
905 next_listen:
906 cb->args[3] = 0;
907 cb->args[4] = 0;
908 ++num;
909 }
910 spin_unlock_bh(&ilb->lock);
911
912 s_num = 0;
913 cb->args[3] = 0;
914 cb->args[4] = 0;
915 }
916 skip_listen_ht:
917 cb->args[0] = 1;
918 s_i = num = s_num = 0;
919 }
920
921 if (!(idiag_states & ~TCPF_LISTEN))
922 goto out;
923
924 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
925 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
926 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
927 struct hlist_nulls_node *node;
928 struct sock *sk;
929
930 num = 0;
931
932 if (hlist_nulls_empty(&head->chain))
933 continue;
934
935 if (i > s_i)
936 s_num = 0;
937
938 spin_lock_bh(lock);
939 sk_nulls_for_each(sk, node, &head->chain) {
940 int state, res;
941
942 if (!net_eq(sock_net(sk), net))
943 continue;
944 if (num < s_num)
945 goto next_normal;
946 state = (sk->sk_state == TCP_TIME_WAIT) ?
947 inet_twsk(sk)->tw_substate : sk->sk_state;
948 if (!(idiag_states & (1 << state)))
949 goto next_normal;
950 if (r->sdiag_family != AF_UNSPEC &&
951 sk->sk_family != r->sdiag_family)
952 goto next_normal;
953 if (r->id.idiag_sport != htons(sk->sk_num) &&
954 r->id.idiag_sport)
955 goto next_normal;
956 if (r->id.idiag_dport != sk->sk_dport &&
957 r->id.idiag_dport)
958 goto next_normal;
959 twsk_build_assert();
960
961 if (!inet_diag_bc_sk(bc, sk))
962 goto next_normal;
963
964 res = sk_diag_fill(sk, skb, r,
965 sk_user_ns(NETLINK_CB(cb->skb).sk),
966 NETLINK_CB(cb->skb).portid,
967 cb->nlh->nlmsg_seq, NLM_F_MULTI,
968 cb->nlh, net_admin);
969 if (res < 0) {
970 spin_unlock_bh(lock);
971 goto done;
972 }
973 next_normal:
974 ++num;
975 }
976
977 spin_unlock_bh(lock);
978 cond_resched();
979 }
980
981 done:
982 cb->args[1] = i;
983 cb->args[2] = num;
984 out:
985 ;
986 }
987 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
988
989 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
990 const struct inet_diag_req_v2 *r,
991 struct nlattr *bc)
992 {
993 const struct inet_diag_handler *handler;
994 int err = 0;
995
996 handler = inet_diag_lock_handler(r->sdiag_protocol);
997 if (!IS_ERR(handler))
998 handler->dump(skb, cb, r, bc);
999 else
1000 err = PTR_ERR(handler);
1001 inet_diag_unlock_handler(handler);
1002
1003 return err ? : skb->len;
1004 }
1005
1006 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1007 {
1008 int hdrlen = sizeof(struct inet_diag_req_v2);
1009 struct nlattr *bc = NULL;
1010
1011 if (nlmsg_attrlen(cb->nlh, hdrlen))
1012 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1013
1014 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1015 }
1016
1017 static int inet_diag_type2proto(int type)
1018 {
1019 switch (type) {
1020 case TCPDIAG_GETSOCK:
1021 return IPPROTO_TCP;
1022 case DCCPDIAG_GETSOCK:
1023 return IPPROTO_DCCP;
1024 default:
1025 return 0;
1026 }
1027 }
1028
1029 static int inet_diag_dump_compat(struct sk_buff *skb,
1030 struct netlink_callback *cb)
1031 {
1032 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1033 int hdrlen = sizeof(struct inet_diag_req);
1034 struct inet_diag_req_v2 req;
1035 struct nlattr *bc = NULL;
1036
1037 req.sdiag_family = AF_UNSPEC; /* compatibility */
1038 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1039 req.idiag_ext = rc->idiag_ext;
1040 req.idiag_states = rc->idiag_states;
1041 req.id = rc->id;
1042
1043 if (nlmsg_attrlen(cb->nlh, hdrlen))
1044 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1045
1046 return __inet_diag_dump(skb, cb, &req, bc);
1047 }
1048
1049 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1050 const struct nlmsghdr *nlh)
1051 {
1052 struct inet_diag_req *rc = nlmsg_data(nlh);
1053 struct inet_diag_req_v2 req;
1054
1055 req.sdiag_family = rc->idiag_family;
1056 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1057 req.idiag_ext = rc->idiag_ext;
1058 req.idiag_states = rc->idiag_states;
1059 req.id = rc->id;
1060
1061 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1062 }
1063
1064 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1065 {
1066 int hdrlen = sizeof(struct inet_diag_req);
1067 struct net *net = sock_net(skb->sk);
1068
1069 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1070 nlmsg_len(nlh) < hdrlen)
1071 return -EINVAL;
1072
1073 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1074 if (nlmsg_attrlen(nlh, hdrlen)) {
1075 struct nlattr *attr;
1076 int err;
1077
1078 attr = nlmsg_find_attr(nlh, hdrlen,
1079 INET_DIAG_REQ_BYTECODE);
1080 err = inet_diag_bc_audit(attr, skb);
1081 if (err)
1082 return err;
1083 }
1084 {
1085 struct netlink_dump_control c = {
1086 .dump = inet_diag_dump_compat,
1087 };
1088 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1089 }
1090 }
1091
1092 return inet_diag_get_exact_compat(skb, nlh);
1093 }
1094
1095 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1096 {
1097 int hdrlen = sizeof(struct inet_diag_req_v2);
1098 struct net *net = sock_net(skb->sk);
1099
1100 if (nlmsg_len(h) < hdrlen)
1101 return -EINVAL;
1102
1103 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1104 h->nlmsg_flags & NLM_F_DUMP) {
1105 if (nlmsg_attrlen(h, hdrlen)) {
1106 struct nlattr *attr;
1107 int err;
1108
1109 attr = nlmsg_find_attr(h, hdrlen,
1110 INET_DIAG_REQ_BYTECODE);
1111 err = inet_diag_bc_audit(attr, skb);
1112 if (err)
1113 return err;
1114 }
1115 {
1116 struct netlink_dump_control c = {
1117 .dump = inet_diag_dump,
1118 };
1119 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1120 }
1121 }
1122
1123 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1124 }
1125
1126 static
1127 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1128 {
1129 const struct inet_diag_handler *handler;
1130 struct nlmsghdr *nlh;
1131 struct nlattr *attr;
1132 struct inet_diag_msg *r;
1133 void *info = NULL;
1134 int err = 0;
1135
1136 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1137 if (!nlh)
1138 return -ENOMEM;
1139
1140 r = nlmsg_data(nlh);
1141 memset(r, 0, sizeof(*r));
1142 inet_diag_msg_common_fill(r, sk);
1143 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1144 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1145 r->idiag_state = sk->sk_state;
1146
1147 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1148 nlmsg_cancel(skb, nlh);
1149 return err;
1150 }
1151
1152 handler = inet_diag_lock_handler(sk->sk_protocol);
1153 if (IS_ERR(handler)) {
1154 inet_diag_unlock_handler(handler);
1155 nlmsg_cancel(skb, nlh);
1156 return PTR_ERR(handler);
1157 }
1158
1159 attr = handler->idiag_info_size
1160 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1161 handler->idiag_info_size,
1162 INET_DIAG_PAD)
1163 : NULL;
1164 if (attr)
1165 info = nla_data(attr);
1166
1167 handler->idiag_get_info(sk, r, info);
1168 inet_diag_unlock_handler(handler);
1169
1170 nlmsg_end(skb, nlh);
1171 return 0;
1172 }
1173
1174 static const struct sock_diag_handler inet_diag_handler = {
1175 .family = AF_INET,
1176 .dump = inet_diag_handler_cmd,
1177 .get_info = inet_diag_handler_get_info,
1178 .destroy = inet_diag_handler_cmd,
1179 };
1180
1181 static const struct sock_diag_handler inet6_diag_handler = {
1182 .family = AF_INET6,
1183 .dump = inet_diag_handler_cmd,
1184 .get_info = inet_diag_handler_get_info,
1185 .destroy = inet_diag_handler_cmd,
1186 };
1187
1188 int inet_diag_register(const struct inet_diag_handler *h)
1189 {
1190 const __u16 type = h->idiag_type;
1191 int err = -EINVAL;
1192
1193 if (type >= IPPROTO_MAX)
1194 goto out;
1195
1196 mutex_lock(&inet_diag_table_mutex);
1197 err = -EEXIST;
1198 if (!inet_diag_table[type]) {
1199 inet_diag_table[type] = h;
1200 err = 0;
1201 }
1202 mutex_unlock(&inet_diag_table_mutex);
1203 out:
1204 return err;
1205 }
1206 EXPORT_SYMBOL_GPL(inet_diag_register);
1207
1208 void inet_diag_unregister(const struct inet_diag_handler *h)
1209 {
1210 const __u16 type = h->idiag_type;
1211
1212 if (type >= IPPROTO_MAX)
1213 return;
1214
1215 mutex_lock(&inet_diag_table_mutex);
1216 inet_diag_table[type] = NULL;
1217 mutex_unlock(&inet_diag_table_mutex);
1218 }
1219 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1220
1221 static int __init inet_diag_init(void)
1222 {
1223 const int inet_diag_table_size = (IPPROTO_MAX *
1224 sizeof(struct inet_diag_handler *));
1225 int err = -ENOMEM;
1226
1227 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1228 if (!inet_diag_table)
1229 goto out;
1230
1231 err = sock_diag_register(&inet_diag_handler);
1232 if (err)
1233 goto out_free_nl;
1234
1235 err = sock_diag_register(&inet6_diag_handler);
1236 if (err)
1237 goto out_free_inet;
1238
1239 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1240 out:
1241 return err;
1242
1243 out_free_inet:
1244 sock_diag_unregister(&inet_diag_handler);
1245 out_free_nl:
1246 kfree(inet_diag_table);
1247 goto out;
1248 }
1249
1250 static void __exit inet_diag_exit(void)
1251 {
1252 sock_diag_unregister(&inet6_diag_handler);
1253 sock_diag_unregister(&inet_diag_handler);
1254 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1255 kfree(inet_diag_table);
1256 }
1257
1258 module_init(inet_diag_init);
1259 module_exit(inet_diag_exit);
1260 MODULE_LICENSE("GPL");
1261 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1262 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
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