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Merge branch 'x86/ras' into x86/core, to fix conflicts
[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 #endif
156
157 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
158 r->idiag_inode = sock_i_ino(sk);
159
160 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
161 struct inet_diag_meminfo minfo = {
162 .idiag_rmem = sk_rmem_alloc_get(sk),
163 .idiag_wmem = sk->sk_wmem_queued,
164 .idiag_fmem = sk->sk_forward_alloc,
165 .idiag_tmem = sk_wmem_alloc_get(sk),
166 };
167
168 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
169 goto errout;
170 }
171
172 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
173 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
174 goto errout;
175
176 if (!icsk) {
177 handler->idiag_get_info(sk, r, NULL);
178 goto out;
179 }
180
181 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
182
183 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
184 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
185 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
186 r->idiag_timer = 1;
187 r->idiag_retrans = icsk->icsk_retransmits;
188 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
189 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
190 r->idiag_timer = 4;
191 r->idiag_retrans = icsk->icsk_probes_out;
192 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
193 } else if (timer_pending(&sk->sk_timer)) {
194 r->idiag_timer = 2;
195 r->idiag_retrans = icsk->icsk_probes_out;
196 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
197 } else {
198 r->idiag_timer = 0;
199 r->idiag_expires = 0;
200 }
201 #undef EXPIRES_IN_MS
202
203 if (ext & (1 << (INET_DIAG_INFO - 1))) {
204 attr = nla_reserve(skb, INET_DIAG_INFO,
205 sizeof(struct tcp_info));
206 if (!attr)
207 goto errout;
208
209 info = nla_data(attr);
210 }
211
212 if (ext & (1 << (INET_DIAG_CONG - 1))) {
213 int err = 0;
214
215 rcu_read_lock();
216 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
217 if (ca_ops)
218 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
219 rcu_read_unlock();
220 if (err < 0)
221 goto errout;
222 }
223
224 handler->idiag_get_info(sk, r, info);
225
226 if (sk->sk_state < TCP_TIME_WAIT) {
227 union tcp_cc_info info;
228 size_t sz = 0;
229 int attr;
230
231 rcu_read_lock();
232 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
233 if (ca_ops && ca_ops->get_info)
234 sz = ca_ops->get_info(sk, ext, &attr, &info);
235 rcu_read_unlock();
236 if (sz && nla_put(skb, attr, sz, &info) < 0)
237 goto errout;
238 }
239
240 out:
241 nlmsg_end(skb, nlh);
242 return 0;
243
244 errout:
245 nlmsg_cancel(skb, nlh);
246 return -EMSGSIZE;
247 }
248 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
249
250 static int inet_csk_diag_fill(struct sock *sk,
251 struct sk_buff *skb,
252 const struct inet_diag_req_v2 *req,
253 struct user_namespace *user_ns,
254 u32 portid, u32 seq, u16 nlmsg_flags,
255 const struct nlmsghdr *unlh)
256 {
257 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
258 user_ns, portid, seq, nlmsg_flags, unlh);
259 }
260
261 static int inet_twsk_diag_fill(struct sock *sk,
262 struct sk_buff *skb,
263 u32 portid, u32 seq, u16 nlmsg_flags,
264 const struct nlmsghdr *unlh)
265 {
266 struct inet_timewait_sock *tw = inet_twsk(sk);
267 struct inet_diag_msg *r;
268 struct nlmsghdr *nlh;
269 long tmo;
270
271 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
272 nlmsg_flags);
273 if (!nlh)
274 return -EMSGSIZE;
275
276 r = nlmsg_data(nlh);
277 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
278
279 tmo = tw->tw_timer.expires - jiffies;
280 if (tmo < 0)
281 tmo = 0;
282
283 inet_diag_msg_common_fill(r, sk);
284 r->idiag_retrans = 0;
285
286 r->idiag_state = tw->tw_substate;
287 r->idiag_timer = 3;
288 r->idiag_expires = jiffies_to_msecs(tmo);
289 r->idiag_rqueue = 0;
290 r->idiag_wqueue = 0;
291 r->idiag_uid = 0;
292 r->idiag_inode = 0;
293
294 nlmsg_end(skb, nlh);
295 return 0;
296 }
297
298 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
299 u32 portid, u32 seq, u16 nlmsg_flags,
300 const struct nlmsghdr *unlh)
301 {
302 struct inet_diag_msg *r;
303 struct nlmsghdr *nlh;
304 long tmo;
305
306 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
307 nlmsg_flags);
308 if (!nlh)
309 return -EMSGSIZE;
310
311 r = nlmsg_data(nlh);
312 inet_diag_msg_common_fill(r, sk);
313 r->idiag_state = TCP_SYN_RECV;
314 r->idiag_timer = 1;
315 r->idiag_retrans = inet_reqsk(sk)->num_retrans;
316
317 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
318 offsetof(struct sock, sk_cookie));
319
320 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
321 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
322 r->idiag_rqueue = 0;
323 r->idiag_wqueue = 0;
324 r->idiag_uid = 0;
325 r->idiag_inode = 0;
326
327 nlmsg_end(skb, nlh);
328 return 0;
329 }
330
331 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
332 const struct inet_diag_req_v2 *r,
333 struct user_namespace *user_ns,
334 u32 portid, u32 seq, u16 nlmsg_flags,
335 const struct nlmsghdr *unlh)
336 {
337 if (sk->sk_state == TCP_TIME_WAIT)
338 return inet_twsk_diag_fill(sk, skb, portid, seq,
339 nlmsg_flags, unlh);
340
341 if (sk->sk_state == TCP_NEW_SYN_RECV)
342 return inet_req_diag_fill(sk, skb, portid, seq,
343 nlmsg_flags, unlh);
344
345 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
346 nlmsg_flags, unlh);
347 }
348
349 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
350 struct sk_buff *in_skb,
351 const struct nlmsghdr *nlh,
352 const struct inet_diag_req_v2 *req)
353 {
354 struct net *net = sock_net(in_skb->sk);
355 struct sk_buff *rep;
356 struct sock *sk;
357 int err;
358
359 err = -EINVAL;
360 if (req->sdiag_family == AF_INET)
361 sk = inet_lookup(net, hashinfo, 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 sk = inet6_lookup(net, hashinfo,
367 (struct in6_addr *)req->id.idiag_dst,
368 req->id.idiag_dport,
369 (struct in6_addr *)req->id.idiag_src,
370 req->id.idiag_sport,
371 req->id.idiag_if);
372 #endif
373 else
374 goto out_nosk;
375
376 err = -ENOENT;
377 if (!sk)
378 goto out_nosk;
379
380 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
381 if (err)
382 goto out;
383
384 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
385 if (!rep) {
386 err = -ENOMEM;
387 goto out;
388 }
389
390 err = sk_diag_fill(sk, rep, req,
391 sk_user_ns(NETLINK_CB(in_skb).sk),
392 NETLINK_CB(in_skb).portid,
393 nlh->nlmsg_seq, 0, nlh);
394 if (err < 0) {
395 WARN_ON(err == -EMSGSIZE);
396 nlmsg_free(rep);
397 goto out;
398 }
399 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
400 MSG_DONTWAIT);
401 if (err > 0)
402 err = 0;
403
404 out:
405 if (sk)
406 sock_gen_put(sk);
407
408 out_nosk:
409 return err;
410 }
411 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
412
413 static int inet_diag_get_exact(struct sk_buff *in_skb,
414 const struct nlmsghdr *nlh,
415 const struct inet_diag_req_v2 *req)
416 {
417 const struct inet_diag_handler *handler;
418 int err;
419
420 handler = inet_diag_lock_handler(req->sdiag_protocol);
421 if (IS_ERR(handler))
422 err = PTR_ERR(handler);
423 else
424 err = handler->dump_one(in_skb, nlh, req);
425 inet_diag_unlock_handler(handler);
426
427 return err;
428 }
429
430 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
431 {
432 int words = bits >> 5;
433
434 bits &= 0x1f;
435
436 if (words) {
437 if (memcmp(a1, a2, words << 2))
438 return 0;
439 }
440 if (bits) {
441 __be32 w1, w2;
442 __be32 mask;
443
444 w1 = a1[words];
445 w2 = a2[words];
446
447 mask = htonl((0xffffffff) << (32 - bits));
448
449 if ((w1 ^ w2) & mask)
450 return 0;
451 }
452
453 return 1;
454 }
455
456 static int inet_diag_bc_run(const struct nlattr *_bc,
457 const struct inet_diag_entry *entry)
458 {
459 const void *bc = nla_data(_bc);
460 int len = nla_len(_bc);
461
462 while (len > 0) {
463 int yes = 1;
464 const struct inet_diag_bc_op *op = bc;
465
466 switch (op->code) {
467 case INET_DIAG_BC_NOP:
468 break;
469 case INET_DIAG_BC_JMP:
470 yes = 0;
471 break;
472 case INET_DIAG_BC_S_GE:
473 yes = entry->sport >= op[1].no;
474 break;
475 case INET_DIAG_BC_S_LE:
476 yes = entry->sport <= op[1].no;
477 break;
478 case INET_DIAG_BC_D_GE:
479 yes = entry->dport >= op[1].no;
480 break;
481 case INET_DIAG_BC_D_LE:
482 yes = entry->dport <= op[1].no;
483 break;
484 case INET_DIAG_BC_AUTO:
485 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
486 break;
487 case INET_DIAG_BC_S_COND:
488 case INET_DIAG_BC_D_COND: {
489 const struct inet_diag_hostcond *cond;
490 const __be32 *addr;
491
492 cond = (const struct inet_diag_hostcond *)(op + 1);
493 if (cond->port != -1 &&
494 cond->port != (op->code == INET_DIAG_BC_S_COND ?
495 entry->sport : entry->dport)) {
496 yes = 0;
497 break;
498 }
499
500 if (op->code == INET_DIAG_BC_S_COND)
501 addr = entry->saddr;
502 else
503 addr = entry->daddr;
504
505 if (cond->family != AF_UNSPEC &&
506 cond->family != entry->family) {
507 if (entry->family == AF_INET6 &&
508 cond->family == AF_INET) {
509 if (addr[0] == 0 && addr[1] == 0 &&
510 addr[2] == htonl(0xffff) &&
511 bitstring_match(addr + 3,
512 cond->addr,
513 cond->prefix_len))
514 break;
515 }
516 yes = 0;
517 break;
518 }
519
520 if (cond->prefix_len == 0)
521 break;
522 if (bitstring_match(addr, cond->addr,
523 cond->prefix_len))
524 break;
525 yes = 0;
526 break;
527 }
528 }
529
530 if (yes) {
531 len -= op->yes;
532 bc += op->yes;
533 } else {
534 len -= op->no;
535 bc += op->no;
536 }
537 }
538 return len == 0;
539 }
540
541 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
542 */
543 static void entry_fill_addrs(struct inet_diag_entry *entry,
544 const struct sock *sk)
545 {
546 #if IS_ENABLED(CONFIG_IPV6)
547 if (sk->sk_family == AF_INET6) {
548 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
549 entry->daddr = sk->sk_v6_daddr.s6_addr32;
550 } else
551 #endif
552 {
553 entry->saddr = &sk->sk_rcv_saddr;
554 entry->daddr = &sk->sk_daddr;
555 }
556 }
557
558 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
559 {
560 struct inet_sock *inet = inet_sk(sk);
561 struct inet_diag_entry entry;
562
563 if (!bc)
564 return 1;
565
566 entry.family = sk->sk_family;
567 entry_fill_addrs(&entry, sk);
568 entry.sport = inet->inet_num;
569 entry.dport = ntohs(inet->inet_dport);
570 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
571
572 return inet_diag_bc_run(bc, &entry);
573 }
574 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
575
576 static int valid_cc(const void *bc, int len, int cc)
577 {
578 while (len >= 0) {
579 const struct inet_diag_bc_op *op = bc;
580
581 if (cc > len)
582 return 0;
583 if (cc == len)
584 return 1;
585 if (op->yes < 4 || op->yes & 3)
586 return 0;
587 len -= op->yes;
588 bc += op->yes;
589 }
590 return 0;
591 }
592
593 /* Validate an inet_diag_hostcond. */
594 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
595 int *min_len)
596 {
597 struct inet_diag_hostcond *cond;
598 int addr_len;
599
600 /* Check hostcond space. */
601 *min_len += sizeof(struct inet_diag_hostcond);
602 if (len < *min_len)
603 return false;
604 cond = (struct inet_diag_hostcond *)(op + 1);
605
606 /* Check address family and address length. */
607 switch (cond->family) {
608 case AF_UNSPEC:
609 addr_len = 0;
610 break;
611 case AF_INET:
612 addr_len = sizeof(struct in_addr);
613 break;
614 case AF_INET6:
615 addr_len = sizeof(struct in6_addr);
616 break;
617 default:
618 return false;
619 }
620 *min_len += addr_len;
621 if (len < *min_len)
622 return false;
623
624 /* Check prefix length (in bits) vs address length (in bytes). */
625 if (cond->prefix_len > 8 * addr_len)
626 return false;
627
628 return true;
629 }
630
631 /* Validate a port comparison operator. */
632 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
633 int len, int *min_len)
634 {
635 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
636 *min_len += sizeof(struct inet_diag_bc_op);
637 if (len < *min_len)
638 return false;
639 return true;
640 }
641
642 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
643 {
644 const void *bc = bytecode;
645 int len = bytecode_len;
646
647 while (len > 0) {
648 int min_len = sizeof(struct inet_diag_bc_op);
649 const struct inet_diag_bc_op *op = bc;
650
651 switch (op->code) {
652 case INET_DIAG_BC_S_COND:
653 case INET_DIAG_BC_D_COND:
654 if (!valid_hostcond(bc, len, &min_len))
655 return -EINVAL;
656 break;
657 case INET_DIAG_BC_S_GE:
658 case INET_DIAG_BC_S_LE:
659 case INET_DIAG_BC_D_GE:
660 case INET_DIAG_BC_D_LE:
661 if (!valid_port_comparison(bc, len, &min_len))
662 return -EINVAL;
663 break;
664 case INET_DIAG_BC_AUTO:
665 case INET_DIAG_BC_JMP:
666 case INET_DIAG_BC_NOP:
667 break;
668 default:
669 return -EINVAL;
670 }
671
672 if (op->code != INET_DIAG_BC_NOP) {
673 if (op->no < min_len || op->no > len + 4 || op->no & 3)
674 return -EINVAL;
675 if (op->no < len &&
676 !valid_cc(bytecode, bytecode_len, len - op->no))
677 return -EINVAL;
678 }
679
680 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
681 return -EINVAL;
682 bc += op->yes;
683 len -= op->yes;
684 }
685 return len == 0 ? 0 : -EINVAL;
686 }
687
688 static int inet_csk_diag_dump(struct sock *sk,
689 struct sk_buff *skb,
690 struct netlink_callback *cb,
691 const struct inet_diag_req_v2 *r,
692 const struct nlattr *bc)
693 {
694 if (!inet_diag_bc_sk(bc, sk))
695 return 0;
696
697 return inet_csk_diag_fill(sk, skb, r,
698 sk_user_ns(NETLINK_CB(cb->skb).sk),
699 NETLINK_CB(cb->skb).portid,
700 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
701 }
702
703 static void twsk_build_assert(void)
704 {
705 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
706 offsetof(struct sock, sk_family));
707
708 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
709 offsetof(struct inet_sock, inet_num));
710
711 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
712 offsetof(struct inet_sock, inet_dport));
713
714 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
715 offsetof(struct inet_sock, inet_rcv_saddr));
716
717 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
718 offsetof(struct inet_sock, inet_daddr));
719
720 #if IS_ENABLED(CONFIG_IPV6)
721 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
722 offsetof(struct sock, sk_v6_rcv_saddr));
723
724 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
725 offsetof(struct sock, sk_v6_daddr));
726 #endif
727 }
728
729 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
730 struct netlink_callback *cb,
731 const struct inet_diag_req_v2 *r,
732 const struct nlattr *bc)
733 {
734 struct inet_connection_sock *icsk = inet_csk(sk);
735 struct inet_sock *inet = inet_sk(sk);
736 struct inet_diag_entry entry;
737 int j, s_j, reqnum, s_reqnum;
738 struct listen_sock *lopt;
739 int err = 0;
740
741 s_j = cb->args[3];
742 s_reqnum = cb->args[4];
743
744 if (s_j > 0)
745 s_j--;
746
747 entry.family = sk->sk_family;
748
749 spin_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
750
751 lopt = icsk->icsk_accept_queue.listen_opt;
752 if (!lopt || !listen_sock_qlen(lopt))
753 goto out;
754
755 if (bc) {
756 entry.sport = inet->inet_num;
757 entry.userlocks = sk->sk_userlocks;
758 }
759
760 for (j = s_j; j < lopt->nr_table_entries; j++) {
761 struct request_sock *req, *head = lopt->syn_table[j];
762
763 reqnum = 0;
764 for (req = head; req; reqnum++, req = req->dl_next) {
765 struct inet_request_sock *ireq = inet_rsk(req);
766
767 if (reqnum < s_reqnum)
768 continue;
769 if (r->id.idiag_dport != ireq->ir_rmt_port &&
770 r->id.idiag_dport)
771 continue;
772
773 if (bc) {
774 /* Note: entry.sport and entry.userlocks are already set */
775 entry_fill_addrs(&entry, req_to_sk(req));
776 entry.dport = ntohs(ireq->ir_rmt_port);
777
778 if (!inet_diag_bc_run(bc, &entry))
779 continue;
780 }
781
782 err = inet_req_diag_fill(req_to_sk(req), skb,
783 NETLINK_CB(cb->skb).portid,
784 cb->nlh->nlmsg_seq,
785 NLM_F_MULTI, cb->nlh);
786 if (err < 0) {
787 cb->args[3] = j + 1;
788 cb->args[4] = reqnum;
789 goto out;
790 }
791 }
792
793 s_reqnum = 0;
794 }
795
796 out:
797 spin_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
798
799 return err;
800 }
801
802 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
803 struct netlink_callback *cb,
804 const struct inet_diag_req_v2 *r, struct nlattr *bc)
805 {
806 struct net *net = sock_net(skb->sk);
807 int i, num, s_i, s_num;
808
809 s_i = cb->args[1];
810 s_num = num = cb->args[2];
811
812 if (cb->args[0] == 0) {
813 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
814 goto skip_listen_ht;
815
816 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
817 struct inet_listen_hashbucket *ilb;
818 struct hlist_nulls_node *node;
819 struct sock *sk;
820
821 num = 0;
822 ilb = &hashinfo->listening_hash[i];
823 spin_lock_bh(&ilb->lock);
824 sk_nulls_for_each(sk, node, &ilb->head) {
825 struct inet_sock *inet = inet_sk(sk);
826
827 if (!net_eq(sock_net(sk), net))
828 continue;
829
830 if (num < s_num) {
831 num++;
832 continue;
833 }
834
835 if (r->sdiag_family != AF_UNSPEC &&
836 sk->sk_family != r->sdiag_family)
837 goto next_listen;
838
839 if (r->id.idiag_sport != inet->inet_sport &&
840 r->id.idiag_sport)
841 goto next_listen;
842
843 if (!(r->idiag_states & TCPF_LISTEN) ||
844 r->id.idiag_dport ||
845 cb->args[3] > 0)
846 goto syn_recv;
847
848 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
849 spin_unlock_bh(&ilb->lock);
850 goto done;
851 }
852
853 syn_recv:
854 if (!(r->idiag_states & TCPF_SYN_RECV))
855 goto next_listen;
856
857 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
858 spin_unlock_bh(&ilb->lock);
859 goto done;
860 }
861
862 next_listen:
863 cb->args[3] = 0;
864 cb->args[4] = 0;
865 ++num;
866 }
867 spin_unlock_bh(&ilb->lock);
868
869 s_num = 0;
870 cb->args[3] = 0;
871 cb->args[4] = 0;
872 }
873 skip_listen_ht:
874 cb->args[0] = 1;
875 s_i = num = s_num = 0;
876 }
877
878 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
879 goto out;
880
881 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
882 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
883 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
884 struct hlist_nulls_node *node;
885 struct sock *sk;
886
887 num = 0;
888
889 if (hlist_nulls_empty(&head->chain))
890 continue;
891
892 if (i > s_i)
893 s_num = 0;
894
895 spin_lock_bh(lock);
896 sk_nulls_for_each(sk, node, &head->chain) {
897 int state, res;
898
899 if (!net_eq(sock_net(sk), net))
900 continue;
901 if (num < s_num)
902 goto next_normal;
903 state = (sk->sk_state == TCP_TIME_WAIT) ?
904 inet_twsk(sk)->tw_substate : sk->sk_state;
905 if (!(r->idiag_states & (1 << state)))
906 goto next_normal;
907 if (r->sdiag_family != AF_UNSPEC &&
908 sk->sk_family != r->sdiag_family)
909 goto next_normal;
910 if (r->id.idiag_sport != htons(sk->sk_num) &&
911 r->id.idiag_sport)
912 goto next_normal;
913 if (r->id.idiag_dport != sk->sk_dport &&
914 r->id.idiag_dport)
915 goto next_normal;
916 twsk_build_assert();
917
918 if (!inet_diag_bc_sk(bc, sk))
919 goto next_normal;
920
921 res = sk_diag_fill(sk, skb, r,
922 sk_user_ns(NETLINK_CB(cb->skb).sk),
923 NETLINK_CB(cb->skb).portid,
924 cb->nlh->nlmsg_seq, NLM_F_MULTI,
925 cb->nlh);
926 if (res < 0) {
927 spin_unlock_bh(lock);
928 goto done;
929 }
930 next_normal:
931 ++num;
932 }
933
934 spin_unlock_bh(lock);
935 }
936
937 done:
938 cb->args[1] = i;
939 cb->args[2] = num;
940 out:
941 ;
942 }
943 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
944
945 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
946 const struct inet_diag_req_v2 *r,
947 struct nlattr *bc)
948 {
949 const struct inet_diag_handler *handler;
950 int err = 0;
951
952 handler = inet_diag_lock_handler(r->sdiag_protocol);
953 if (!IS_ERR(handler))
954 handler->dump(skb, cb, r, bc);
955 else
956 err = PTR_ERR(handler);
957 inet_diag_unlock_handler(handler);
958
959 return err ? : skb->len;
960 }
961
962 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
963 {
964 int hdrlen = sizeof(struct inet_diag_req_v2);
965 struct nlattr *bc = NULL;
966
967 if (nlmsg_attrlen(cb->nlh, hdrlen))
968 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
969
970 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
971 }
972
973 static int inet_diag_type2proto(int type)
974 {
975 switch (type) {
976 case TCPDIAG_GETSOCK:
977 return IPPROTO_TCP;
978 case DCCPDIAG_GETSOCK:
979 return IPPROTO_DCCP;
980 default:
981 return 0;
982 }
983 }
984
985 static int inet_diag_dump_compat(struct sk_buff *skb,
986 struct netlink_callback *cb)
987 {
988 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
989 int hdrlen = sizeof(struct inet_diag_req);
990 struct inet_diag_req_v2 req;
991 struct nlattr *bc = NULL;
992
993 req.sdiag_family = AF_UNSPEC; /* compatibility */
994 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
995 req.idiag_ext = rc->idiag_ext;
996 req.idiag_states = rc->idiag_states;
997 req.id = rc->id;
998
999 if (nlmsg_attrlen(cb->nlh, hdrlen))
1000 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1001
1002 return __inet_diag_dump(skb, cb, &req, bc);
1003 }
1004
1005 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1006 const struct nlmsghdr *nlh)
1007 {
1008 struct inet_diag_req *rc = nlmsg_data(nlh);
1009 struct inet_diag_req_v2 req;
1010
1011 req.sdiag_family = rc->idiag_family;
1012 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1013 req.idiag_ext = rc->idiag_ext;
1014 req.idiag_states = rc->idiag_states;
1015 req.id = rc->id;
1016
1017 return inet_diag_get_exact(in_skb, nlh, &req);
1018 }
1019
1020 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1021 {
1022 int hdrlen = sizeof(struct inet_diag_req);
1023 struct net *net = sock_net(skb->sk);
1024
1025 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1026 nlmsg_len(nlh) < hdrlen)
1027 return -EINVAL;
1028
1029 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1030 if (nlmsg_attrlen(nlh, hdrlen)) {
1031 struct nlattr *attr;
1032
1033 attr = nlmsg_find_attr(nlh, hdrlen,
1034 INET_DIAG_REQ_BYTECODE);
1035 if (!attr ||
1036 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1037 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1038 return -EINVAL;
1039 }
1040 {
1041 struct netlink_dump_control c = {
1042 .dump = inet_diag_dump_compat,
1043 };
1044 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1045 }
1046 }
1047
1048 return inet_diag_get_exact_compat(skb, nlh);
1049 }
1050
1051 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1052 {
1053 int hdrlen = sizeof(struct inet_diag_req_v2);
1054 struct net *net = sock_net(skb->sk);
1055
1056 if (nlmsg_len(h) < hdrlen)
1057 return -EINVAL;
1058
1059 if (h->nlmsg_flags & NLM_F_DUMP) {
1060 if (nlmsg_attrlen(h, hdrlen)) {
1061 struct nlattr *attr;
1062
1063 attr = nlmsg_find_attr(h, hdrlen,
1064 INET_DIAG_REQ_BYTECODE);
1065 if (!attr ||
1066 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1067 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1068 return -EINVAL;
1069 }
1070 {
1071 struct netlink_dump_control c = {
1072 .dump = inet_diag_dump,
1073 };
1074 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1075 }
1076 }
1077
1078 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1079 }
1080
1081 static const struct sock_diag_handler inet_diag_handler = {
1082 .family = AF_INET,
1083 .dump = inet_diag_handler_dump,
1084 };
1085
1086 static const struct sock_diag_handler inet6_diag_handler = {
1087 .family = AF_INET6,
1088 .dump = inet_diag_handler_dump,
1089 };
1090
1091 int inet_diag_register(const struct inet_diag_handler *h)
1092 {
1093 const __u16 type = h->idiag_type;
1094 int err = -EINVAL;
1095
1096 if (type >= IPPROTO_MAX)
1097 goto out;
1098
1099 mutex_lock(&inet_diag_table_mutex);
1100 err = -EEXIST;
1101 if (!inet_diag_table[type]) {
1102 inet_diag_table[type] = h;
1103 err = 0;
1104 }
1105 mutex_unlock(&inet_diag_table_mutex);
1106 out:
1107 return err;
1108 }
1109 EXPORT_SYMBOL_GPL(inet_diag_register);
1110
1111 void inet_diag_unregister(const struct inet_diag_handler *h)
1112 {
1113 const __u16 type = h->idiag_type;
1114
1115 if (type >= IPPROTO_MAX)
1116 return;
1117
1118 mutex_lock(&inet_diag_table_mutex);
1119 inet_diag_table[type] = NULL;
1120 mutex_unlock(&inet_diag_table_mutex);
1121 }
1122 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1123
1124 static int __init inet_diag_init(void)
1125 {
1126 const int inet_diag_table_size = (IPPROTO_MAX *
1127 sizeof(struct inet_diag_handler *));
1128 int err = -ENOMEM;
1129
1130 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1131 if (!inet_diag_table)
1132 goto out;
1133
1134 err = sock_diag_register(&inet_diag_handler);
1135 if (err)
1136 goto out_free_nl;
1137
1138 err = sock_diag_register(&inet6_diag_handler);
1139 if (err)
1140 goto out_free_inet;
1141
1142 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1143 out:
1144 return err;
1145
1146 out_free_inet:
1147 sock_diag_unregister(&inet_diag_handler);
1148 out_free_nl:
1149 kfree(inet_diag_table);
1150 goto out;
1151 }
1152
1153 static void __exit inet_diag_exit(void)
1154 {
1155 sock_diag_unregister(&inet6_diag_handler);
1156 sock_diag_unregister(&inet_diag_handler);
1157 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1158 kfree(inet_diag_table);
1159 }
1160
1161 module_init(inet_diag_init);
1162 module_exit(inet_diag_exit);
1163 MODULE_LICENSE("GPL");
1164 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1165 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
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