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[deliverable/linux.git] / net / ipv4 / inet_diag.c
1 /*
2 * inet_diag.c Module for monitoring INET transport protocols sockets.
3 *
4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/fcntl.h>
16 #include <linux/random.h>
17 #include <linux/slab.h>
18 #include <linux/cache.h>
19 #include <linux/init.h>
20 #include <linux/time.h>
21
22 #include <net/icmp.h>
23 #include <net/tcp.h>
24 #include <net/ipv6.h>
25 #include <net/inet_common.h>
26 #include <net/inet_connection_sock.h>
27 #include <net/inet_hashtables.h>
28 #include <net/inet_timewait_sock.h>
29 #include <net/inet6_hashtables.h>
30 #include <net/netlink.h>
31
32 #include <linux/inet.h>
33 #include <linux/stddef.h>
34
35 #include <linux/inet_diag.h>
36 #include <linux/sock_diag.h>
37
38 static const struct inet_diag_handler **inet_diag_table;
39
40 struct inet_diag_entry {
41 const __be32 *saddr;
42 const __be32 *daddr;
43 u16 sport;
44 u16 dport;
45 u16 family;
46 u16 userlocks;
47 };
48
49 static DEFINE_MUTEX(inet_diag_table_mutex);
50
51 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
52 {
53 if (!inet_diag_table[proto])
54 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
55 NETLINK_SOCK_DIAG, AF_INET, proto);
56
57 mutex_lock(&inet_diag_table_mutex);
58 if (!inet_diag_table[proto])
59 return ERR_PTR(-ENOENT);
60
61 return inet_diag_table[proto];
62 }
63
64 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
65 {
66 mutex_unlock(&inet_diag_table_mutex);
67 }
68
69 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 rcu_read_lock();
360 if (req->sdiag_family == AF_INET)
361 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
362 req->id.idiag_dport, req->id.idiag_src[0],
363 req->id.idiag_sport, req->id.idiag_if);
364 #if IS_ENABLED(CONFIG_IPV6)
365 else if (req->sdiag_family == AF_INET6) {
366 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
367 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
368 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
369 req->id.idiag_dport, req->id.idiag_src[3],
370 req->id.idiag_sport, req->id.idiag_if);
371 else
372 sk = inet6_lookup(net, hashinfo, NULL, 0,
373 (struct in6_addr *)req->id.idiag_dst,
374 req->id.idiag_dport,
375 (struct in6_addr *)req->id.idiag_src,
376 req->id.idiag_sport,
377 req->id.idiag_if);
378 }
379 #endif
380 else {
381 rcu_read_unlock();
382 return ERR_PTR(-EINVAL);
383 }
384 rcu_read_unlock();
385 if (!sk)
386 return ERR_PTR(-ENOENT);
387
388 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
389 sock_gen_put(sk);
390 return ERR_PTR(-ENOENT);
391 }
392
393 return sk;
394 }
395 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
396
397 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
398 struct sk_buff *in_skb,
399 const struct nlmsghdr *nlh,
400 const struct inet_diag_req_v2 *req)
401 {
402 struct net *net = sock_net(in_skb->sk);
403 struct sk_buff *rep;
404 struct sock *sk;
405 int err;
406
407 sk = inet_diag_find_one_icsk(net, hashinfo, req);
408 if (IS_ERR(sk))
409 return PTR_ERR(sk);
410
411 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
412 if (!rep) {
413 err = -ENOMEM;
414 goto out;
415 }
416
417 err = sk_diag_fill(sk, rep, req,
418 sk_user_ns(NETLINK_CB(in_skb).sk),
419 NETLINK_CB(in_skb).portid,
420 nlh->nlmsg_seq, 0, nlh);
421 if (err < 0) {
422 WARN_ON(err == -EMSGSIZE);
423 nlmsg_free(rep);
424 goto out;
425 }
426 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
427 MSG_DONTWAIT);
428 if (err > 0)
429 err = 0;
430
431 out:
432 if (sk)
433 sock_gen_put(sk);
434
435 return err;
436 }
437 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
438
439 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
440 const struct nlmsghdr *nlh,
441 const struct inet_diag_req_v2 *req)
442 {
443 const struct inet_diag_handler *handler;
444 int err;
445
446 handler = inet_diag_lock_handler(req->sdiag_protocol);
447 if (IS_ERR(handler))
448 err = PTR_ERR(handler);
449 else if (cmd == SOCK_DIAG_BY_FAMILY)
450 err = handler->dump_one(in_skb, nlh, req);
451 else if (cmd == SOCK_DESTROY && handler->destroy)
452 err = handler->destroy(in_skb, req);
453 else
454 err = -EOPNOTSUPP;
455 inet_diag_unlock_handler(handler);
456
457 return err;
458 }
459
460 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
461 {
462 int words = bits >> 5;
463
464 bits &= 0x1f;
465
466 if (words) {
467 if (memcmp(a1, a2, words << 2))
468 return 0;
469 }
470 if (bits) {
471 __be32 w1, w2;
472 __be32 mask;
473
474 w1 = a1[words];
475 w2 = a2[words];
476
477 mask = htonl((0xffffffff) << (32 - bits));
478
479 if ((w1 ^ w2) & mask)
480 return 0;
481 }
482
483 return 1;
484 }
485
486 static int inet_diag_bc_run(const struct nlattr *_bc,
487 const struct inet_diag_entry *entry)
488 {
489 const void *bc = nla_data(_bc);
490 int len = nla_len(_bc);
491
492 while (len > 0) {
493 int yes = 1;
494 const struct inet_diag_bc_op *op = bc;
495
496 switch (op->code) {
497 case INET_DIAG_BC_NOP:
498 break;
499 case INET_DIAG_BC_JMP:
500 yes = 0;
501 break;
502 case INET_DIAG_BC_S_GE:
503 yes = entry->sport >= op[1].no;
504 break;
505 case INET_DIAG_BC_S_LE:
506 yes = entry->sport <= op[1].no;
507 break;
508 case INET_DIAG_BC_D_GE:
509 yes = entry->dport >= op[1].no;
510 break;
511 case INET_DIAG_BC_D_LE:
512 yes = entry->dport <= op[1].no;
513 break;
514 case INET_DIAG_BC_AUTO:
515 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
516 break;
517 case INET_DIAG_BC_S_COND:
518 case INET_DIAG_BC_D_COND: {
519 const struct inet_diag_hostcond *cond;
520 const __be32 *addr;
521
522 cond = (const struct inet_diag_hostcond *)(op + 1);
523 if (cond->port != -1 &&
524 cond->port != (op->code == INET_DIAG_BC_S_COND ?
525 entry->sport : entry->dport)) {
526 yes = 0;
527 break;
528 }
529
530 if (op->code == INET_DIAG_BC_S_COND)
531 addr = entry->saddr;
532 else
533 addr = entry->daddr;
534
535 if (cond->family != AF_UNSPEC &&
536 cond->family != entry->family) {
537 if (entry->family == AF_INET6 &&
538 cond->family == AF_INET) {
539 if (addr[0] == 0 && addr[1] == 0 &&
540 addr[2] == htonl(0xffff) &&
541 bitstring_match(addr + 3,
542 cond->addr,
543 cond->prefix_len))
544 break;
545 }
546 yes = 0;
547 break;
548 }
549
550 if (cond->prefix_len == 0)
551 break;
552 if (bitstring_match(addr, cond->addr,
553 cond->prefix_len))
554 break;
555 yes = 0;
556 break;
557 }
558 }
559
560 if (yes) {
561 len -= op->yes;
562 bc += op->yes;
563 } else {
564 len -= op->no;
565 bc += op->no;
566 }
567 }
568 return len == 0;
569 }
570
571 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
572 */
573 static void entry_fill_addrs(struct inet_diag_entry *entry,
574 const struct sock *sk)
575 {
576 #if IS_ENABLED(CONFIG_IPV6)
577 if (sk->sk_family == AF_INET6) {
578 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
579 entry->daddr = sk->sk_v6_daddr.s6_addr32;
580 } else
581 #endif
582 {
583 entry->saddr = &sk->sk_rcv_saddr;
584 entry->daddr = &sk->sk_daddr;
585 }
586 }
587
588 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
589 {
590 struct inet_sock *inet = inet_sk(sk);
591 struct inet_diag_entry entry;
592
593 if (!bc)
594 return 1;
595
596 entry.family = sk->sk_family;
597 entry_fill_addrs(&entry, sk);
598 entry.sport = inet->inet_num;
599 entry.dport = ntohs(inet->inet_dport);
600 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
601
602 return inet_diag_bc_run(bc, &entry);
603 }
604 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
605
606 static int valid_cc(const void *bc, int len, int cc)
607 {
608 while (len >= 0) {
609 const struct inet_diag_bc_op *op = bc;
610
611 if (cc > len)
612 return 0;
613 if (cc == len)
614 return 1;
615 if (op->yes < 4 || op->yes & 3)
616 return 0;
617 len -= op->yes;
618 bc += op->yes;
619 }
620 return 0;
621 }
622
623 /* Validate an inet_diag_hostcond. */
624 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
625 int *min_len)
626 {
627 struct inet_diag_hostcond *cond;
628 int addr_len;
629
630 /* Check hostcond space. */
631 *min_len += sizeof(struct inet_diag_hostcond);
632 if (len < *min_len)
633 return false;
634 cond = (struct inet_diag_hostcond *)(op + 1);
635
636 /* Check address family and address length. */
637 switch (cond->family) {
638 case AF_UNSPEC:
639 addr_len = 0;
640 break;
641 case AF_INET:
642 addr_len = sizeof(struct in_addr);
643 break;
644 case AF_INET6:
645 addr_len = sizeof(struct in6_addr);
646 break;
647 default:
648 return false;
649 }
650 *min_len += addr_len;
651 if (len < *min_len)
652 return false;
653
654 /* Check prefix length (in bits) vs address length (in bytes). */
655 if (cond->prefix_len > 8 * addr_len)
656 return false;
657
658 return true;
659 }
660
661 /* Validate a port comparison operator. */
662 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
663 int len, int *min_len)
664 {
665 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
666 *min_len += sizeof(struct inet_diag_bc_op);
667 if (len < *min_len)
668 return false;
669 return true;
670 }
671
672 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
673 {
674 const void *bc = bytecode;
675 int len = bytecode_len;
676
677 while (len > 0) {
678 int min_len = sizeof(struct inet_diag_bc_op);
679 const struct inet_diag_bc_op *op = bc;
680
681 switch (op->code) {
682 case INET_DIAG_BC_S_COND:
683 case INET_DIAG_BC_D_COND:
684 if (!valid_hostcond(bc, len, &min_len))
685 return -EINVAL;
686 break;
687 case INET_DIAG_BC_S_GE:
688 case INET_DIAG_BC_S_LE:
689 case INET_DIAG_BC_D_GE:
690 case INET_DIAG_BC_D_LE:
691 if (!valid_port_comparison(bc, len, &min_len))
692 return -EINVAL;
693 break;
694 case INET_DIAG_BC_AUTO:
695 case INET_DIAG_BC_JMP:
696 case INET_DIAG_BC_NOP:
697 break;
698 default:
699 return -EINVAL;
700 }
701
702 if (op->code != INET_DIAG_BC_NOP) {
703 if (op->no < min_len || op->no > len + 4 || op->no & 3)
704 return -EINVAL;
705 if (op->no < len &&
706 !valid_cc(bytecode, bytecode_len, len - op->no))
707 return -EINVAL;
708 }
709
710 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
711 return -EINVAL;
712 bc += op->yes;
713 len -= op->yes;
714 }
715 return len == 0 ? 0 : -EINVAL;
716 }
717
718 static int inet_csk_diag_dump(struct sock *sk,
719 struct sk_buff *skb,
720 struct netlink_callback *cb,
721 const struct inet_diag_req_v2 *r,
722 const struct nlattr *bc)
723 {
724 if (!inet_diag_bc_sk(bc, sk))
725 return 0;
726
727 return inet_csk_diag_fill(sk, skb, r,
728 sk_user_ns(NETLINK_CB(cb->skb).sk),
729 NETLINK_CB(cb->skb).portid,
730 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
731 }
732
733 static void twsk_build_assert(void)
734 {
735 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
736 offsetof(struct sock, sk_family));
737
738 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
739 offsetof(struct inet_sock, inet_num));
740
741 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
742 offsetof(struct inet_sock, inet_dport));
743
744 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
745 offsetof(struct inet_sock, inet_rcv_saddr));
746
747 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
748 offsetof(struct inet_sock, inet_daddr));
749
750 #if IS_ENABLED(CONFIG_IPV6)
751 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
752 offsetof(struct sock, sk_v6_rcv_saddr));
753
754 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
755 offsetof(struct sock, sk_v6_daddr));
756 #endif
757 }
758
759 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
760 struct netlink_callback *cb,
761 const struct inet_diag_req_v2 *r, struct nlattr *bc)
762 {
763 struct net *net = sock_net(skb->sk);
764 int i, num, s_i, s_num;
765 u32 idiag_states = r->idiag_states;
766
767 if (idiag_states & TCPF_SYN_RECV)
768 idiag_states |= TCPF_NEW_SYN_RECV;
769 s_i = cb->args[1];
770 s_num = num = cb->args[2];
771
772 if (cb->args[0] == 0) {
773 if (!(idiag_states & TCPF_LISTEN))
774 goto skip_listen_ht;
775
776 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
777 struct inet_listen_hashbucket *ilb;
778 struct sock *sk;
779
780 num = 0;
781 ilb = &hashinfo->listening_hash[i];
782 spin_lock_bh(&ilb->lock);
783 sk_for_each(sk, &ilb->head) {
784 struct inet_sock *inet = inet_sk(sk);
785
786 if (!net_eq(sock_net(sk), net))
787 continue;
788
789 if (num < s_num) {
790 num++;
791 continue;
792 }
793
794 if (r->sdiag_family != AF_UNSPEC &&
795 sk->sk_family != r->sdiag_family)
796 goto next_listen;
797
798 if (r->id.idiag_sport != inet->inet_sport &&
799 r->id.idiag_sport)
800 goto next_listen;
801
802 if (r->id.idiag_dport ||
803 cb->args[3] > 0)
804 goto next_listen;
805
806 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
807 spin_unlock_bh(&ilb->lock);
808 goto done;
809 }
810
811 next_listen:
812 cb->args[3] = 0;
813 cb->args[4] = 0;
814 ++num;
815 }
816 spin_unlock_bh(&ilb->lock);
817
818 s_num = 0;
819 cb->args[3] = 0;
820 cb->args[4] = 0;
821 }
822 skip_listen_ht:
823 cb->args[0] = 1;
824 s_i = num = s_num = 0;
825 }
826
827 if (!(idiag_states & ~TCPF_LISTEN))
828 goto out;
829
830 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
831 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
832 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
833 struct hlist_nulls_node *node;
834 struct sock *sk;
835
836 num = 0;
837
838 if (hlist_nulls_empty(&head->chain))
839 continue;
840
841 if (i > s_i)
842 s_num = 0;
843
844 spin_lock_bh(lock);
845 sk_nulls_for_each(sk, node, &head->chain) {
846 int state, res;
847
848 if (!net_eq(sock_net(sk), net))
849 continue;
850 if (num < s_num)
851 goto next_normal;
852 state = (sk->sk_state == TCP_TIME_WAIT) ?
853 inet_twsk(sk)->tw_substate : sk->sk_state;
854 if (!(idiag_states & (1 << state)))
855 goto next_normal;
856 if (r->sdiag_family != AF_UNSPEC &&
857 sk->sk_family != r->sdiag_family)
858 goto next_normal;
859 if (r->id.idiag_sport != htons(sk->sk_num) &&
860 r->id.idiag_sport)
861 goto next_normal;
862 if (r->id.idiag_dport != sk->sk_dport &&
863 r->id.idiag_dport)
864 goto next_normal;
865 twsk_build_assert();
866
867 if (!inet_diag_bc_sk(bc, sk))
868 goto next_normal;
869
870 res = sk_diag_fill(sk, skb, r,
871 sk_user_ns(NETLINK_CB(cb->skb).sk),
872 NETLINK_CB(cb->skb).portid,
873 cb->nlh->nlmsg_seq, NLM_F_MULTI,
874 cb->nlh);
875 if (res < 0) {
876 spin_unlock_bh(lock);
877 goto done;
878 }
879 next_normal:
880 ++num;
881 }
882
883 spin_unlock_bh(lock);
884 cond_resched();
885 }
886
887 done:
888 cb->args[1] = i;
889 cb->args[2] = num;
890 out:
891 ;
892 }
893 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
894
895 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
896 const struct inet_diag_req_v2 *r,
897 struct nlattr *bc)
898 {
899 const struct inet_diag_handler *handler;
900 int err = 0;
901
902 handler = inet_diag_lock_handler(r->sdiag_protocol);
903 if (!IS_ERR(handler))
904 handler->dump(skb, cb, r, bc);
905 else
906 err = PTR_ERR(handler);
907 inet_diag_unlock_handler(handler);
908
909 return err ? : skb->len;
910 }
911
912 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
913 {
914 int hdrlen = sizeof(struct inet_diag_req_v2);
915 struct nlattr *bc = NULL;
916
917 if (nlmsg_attrlen(cb->nlh, hdrlen))
918 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
919
920 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
921 }
922
923 static int inet_diag_type2proto(int type)
924 {
925 switch (type) {
926 case TCPDIAG_GETSOCK:
927 return IPPROTO_TCP;
928 case DCCPDIAG_GETSOCK:
929 return IPPROTO_DCCP;
930 default:
931 return 0;
932 }
933 }
934
935 static int inet_diag_dump_compat(struct sk_buff *skb,
936 struct netlink_callback *cb)
937 {
938 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
939 int hdrlen = sizeof(struct inet_diag_req);
940 struct inet_diag_req_v2 req;
941 struct nlattr *bc = NULL;
942
943 req.sdiag_family = AF_UNSPEC; /* compatibility */
944 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
945 req.idiag_ext = rc->idiag_ext;
946 req.idiag_states = rc->idiag_states;
947 req.id = rc->id;
948
949 if (nlmsg_attrlen(cb->nlh, hdrlen))
950 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
951
952 return __inet_diag_dump(skb, cb, &req, bc);
953 }
954
955 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
956 const struct nlmsghdr *nlh)
957 {
958 struct inet_diag_req *rc = nlmsg_data(nlh);
959 struct inet_diag_req_v2 req;
960
961 req.sdiag_family = rc->idiag_family;
962 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
963 req.idiag_ext = rc->idiag_ext;
964 req.idiag_states = rc->idiag_states;
965 req.id = rc->id;
966
967 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
968 }
969
970 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
971 {
972 int hdrlen = sizeof(struct inet_diag_req);
973 struct net *net = sock_net(skb->sk);
974
975 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
976 nlmsg_len(nlh) < hdrlen)
977 return -EINVAL;
978
979 if (nlh->nlmsg_flags & NLM_F_DUMP) {
980 if (nlmsg_attrlen(nlh, hdrlen)) {
981 struct nlattr *attr;
982
983 attr = nlmsg_find_attr(nlh, hdrlen,
984 INET_DIAG_REQ_BYTECODE);
985 if (!attr ||
986 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
987 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
988 return -EINVAL;
989 }
990 {
991 struct netlink_dump_control c = {
992 .dump = inet_diag_dump_compat,
993 };
994 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
995 }
996 }
997
998 return inet_diag_get_exact_compat(skb, nlh);
999 }
1000
1001 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1002 {
1003 int hdrlen = sizeof(struct inet_diag_req_v2);
1004 struct net *net = sock_net(skb->sk);
1005
1006 if (nlmsg_len(h) < hdrlen)
1007 return -EINVAL;
1008
1009 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1010 h->nlmsg_flags & NLM_F_DUMP) {
1011 if (nlmsg_attrlen(h, hdrlen)) {
1012 struct nlattr *attr;
1013
1014 attr = nlmsg_find_attr(h, hdrlen,
1015 INET_DIAG_REQ_BYTECODE);
1016 if (!attr ||
1017 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1018 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1019 return -EINVAL;
1020 }
1021 {
1022 struct netlink_dump_control c = {
1023 .dump = inet_diag_dump,
1024 };
1025 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1026 }
1027 }
1028
1029 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1030 }
1031
1032 static
1033 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1034 {
1035 const struct inet_diag_handler *handler;
1036 struct nlmsghdr *nlh;
1037 struct nlattr *attr;
1038 struct inet_diag_msg *r;
1039 void *info = NULL;
1040 int err = 0;
1041
1042 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1043 if (!nlh)
1044 return -ENOMEM;
1045
1046 r = nlmsg_data(nlh);
1047 memset(r, 0, sizeof(*r));
1048 inet_diag_msg_common_fill(r, sk);
1049 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1050 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1051 r->idiag_state = sk->sk_state;
1052
1053 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1054 nlmsg_cancel(skb, nlh);
1055 return err;
1056 }
1057
1058 handler = inet_diag_lock_handler(sk->sk_protocol);
1059 if (IS_ERR(handler)) {
1060 inet_diag_unlock_handler(handler);
1061 nlmsg_cancel(skb, nlh);
1062 return PTR_ERR(handler);
1063 }
1064
1065 attr = handler->idiag_info_size
1066 ? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size)
1067 : NULL;
1068 if (attr)
1069 info = nla_data(attr);
1070
1071 handler->idiag_get_info(sk, r, info);
1072 inet_diag_unlock_handler(handler);
1073
1074 nlmsg_end(skb, nlh);
1075 return 0;
1076 }
1077
1078 static const struct sock_diag_handler inet_diag_handler = {
1079 .family = AF_INET,
1080 .dump = inet_diag_handler_cmd,
1081 .get_info = inet_diag_handler_get_info,
1082 .destroy = inet_diag_handler_cmd,
1083 };
1084
1085 static const struct sock_diag_handler inet6_diag_handler = {
1086 .family = AF_INET6,
1087 .dump = inet_diag_handler_cmd,
1088 .get_info = inet_diag_handler_get_info,
1089 .destroy = inet_diag_handler_cmd,
1090 };
1091
1092 int inet_diag_register(const struct inet_diag_handler *h)
1093 {
1094 const __u16 type = h->idiag_type;
1095 int err = -EINVAL;
1096
1097 if (type >= IPPROTO_MAX)
1098 goto out;
1099
1100 mutex_lock(&inet_diag_table_mutex);
1101 err = -EEXIST;
1102 if (!inet_diag_table[type]) {
1103 inet_diag_table[type] = h;
1104 err = 0;
1105 }
1106 mutex_unlock(&inet_diag_table_mutex);
1107 out:
1108 return err;
1109 }
1110 EXPORT_SYMBOL_GPL(inet_diag_register);
1111
1112 void inet_diag_unregister(const struct inet_diag_handler *h)
1113 {
1114 const __u16 type = h->idiag_type;
1115
1116 if (type >= IPPROTO_MAX)
1117 return;
1118
1119 mutex_lock(&inet_diag_table_mutex);
1120 inet_diag_table[type] = NULL;
1121 mutex_unlock(&inet_diag_table_mutex);
1122 }
1123 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1124
1125 static int __init inet_diag_init(void)
1126 {
1127 const int inet_diag_table_size = (IPPROTO_MAX *
1128 sizeof(struct inet_diag_handler *));
1129 int err = -ENOMEM;
1130
1131 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1132 if (!inet_diag_table)
1133 goto out;
1134
1135 err = sock_diag_register(&inet_diag_handler);
1136 if (err)
1137 goto out_free_nl;
1138
1139 err = sock_diag_register(&inet6_diag_handler);
1140 if (err)
1141 goto out_free_inet;
1142
1143 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1144 out:
1145 return err;
1146
1147 out_free_inet:
1148 sock_diag_unregister(&inet_diag_handler);
1149 out_free_nl:
1150 kfree(inet_diag_table);
1151 goto out;
1152 }
1153
1154 static void __exit inet_diag_exit(void)
1155 {
1156 sock_diag_unregister(&inet6_diag_handler);
1157 sock_diag_unregister(&inet_diag_handler);
1158 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1159 kfree(inet_diag_table);
1160 }
1161
1162 module_init(inet_diag_init);
1163 module_exit(inet_diag_exit);
1164 MODULE_LICENSE("GPL");
1165 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1166 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
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