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net: constify sock_diag_check_cookie()
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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
38static const struct inet_diag_handler **inet_diag_table;
39
40struct inet_diag_entry {
41 __be32 *saddr;
42 __be32 *daddr;
43 u16 sport;
44 u16 dport;
45 u16 family;
46 u16 userlocks;
47#if IS_ENABLED(CONFIG_IPV6)
48 struct in6_addr saddr_storage; /* for IPv4-mapped-IPv6 addresses */
49 struct in6_addr daddr_storage; /* for IPv4-mapped-IPv6 addresses */
50#endif
51};
52
53static DEFINE_MUTEX(inet_diag_table_mutex);
54
55static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
56{
57 if (!inet_diag_table[proto])
58 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
59 NETLINK_SOCK_DIAG, AF_INET, proto);
60
61 mutex_lock(&inet_diag_table_mutex);
62 if (!inet_diag_table[proto])
63 return ERR_PTR(-ENOENT);
64
65 return inet_diag_table[proto];
66}
67
68static inline void inet_diag_unlock_handler(
69 const struct inet_diag_handler *handler)
70{
71 mutex_unlock(&inet_diag_table_mutex);
72}
73
74int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
75 struct sk_buff *skb, struct inet_diag_req_v2 *req,
76 struct user_namespace *user_ns,
77 u32 portid, u32 seq, u16 nlmsg_flags,
78 const struct nlmsghdr *unlh)
79{
80 const struct inet_sock *inet = inet_sk(sk);
81 struct inet_diag_msg *r;
82 struct nlmsghdr *nlh;
83 struct nlattr *attr;
84 void *info = NULL;
85 const struct inet_diag_handler *handler;
86 int ext = req->idiag_ext;
87
88 handler = inet_diag_table[req->sdiag_protocol];
89 BUG_ON(handler == NULL);
90
91 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
92 nlmsg_flags);
93 if (!nlh)
94 return -EMSGSIZE;
95
96 r = nlmsg_data(nlh);
97 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
98
99 r->idiag_family = sk->sk_family;
100 r->idiag_state = sk->sk_state;
101 r->idiag_timer = 0;
102 r->idiag_retrans = 0;
103
104 r->id.idiag_if = sk->sk_bound_dev_if;
105 sock_diag_save_cookie(sk, r->id.idiag_cookie);
106
107 r->id.idiag_sport = inet->inet_sport;
108 r->id.idiag_dport = inet->inet_dport;
109
110 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
111 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
112
113 r->id.idiag_src[0] = inet->inet_rcv_saddr;
114 r->id.idiag_dst[0] = inet->inet_daddr;
115
116 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
117 goto errout;
118
119 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
120 * hence this needs to be included regardless of socket family.
121 */
122 if (ext & (1 << (INET_DIAG_TOS - 1)))
123 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
124 goto errout;
125
126#if IS_ENABLED(CONFIG_IPV6)
127 if (r->idiag_family == AF_INET6) {
128
129 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
130 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
131
132 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
133 if (nla_put_u8(skb, INET_DIAG_TCLASS,
134 inet6_sk(sk)->tclass) < 0)
135 goto errout;
136 }
137#endif
138
139 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
140 r->idiag_inode = sock_i_ino(sk);
141
142 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
143 struct inet_diag_meminfo minfo = {
144 .idiag_rmem = sk_rmem_alloc_get(sk),
145 .idiag_wmem = sk->sk_wmem_queued,
146 .idiag_fmem = sk->sk_forward_alloc,
147 .idiag_tmem = sk_wmem_alloc_get(sk),
148 };
149
150 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
151 goto errout;
152 }
153
154 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
155 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
156 goto errout;
157
158 if (icsk == NULL) {
159 handler->idiag_get_info(sk, r, NULL);
160 goto out;
161 }
162
163#define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
164
165 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
166 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
167 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
168 r->idiag_timer = 1;
169 r->idiag_retrans = icsk->icsk_retransmits;
170 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
171 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
172 r->idiag_timer = 4;
173 r->idiag_retrans = icsk->icsk_probes_out;
174 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
175 } else if (timer_pending(&sk->sk_timer)) {
176 r->idiag_timer = 2;
177 r->idiag_retrans = icsk->icsk_probes_out;
178 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
179 } else {
180 r->idiag_timer = 0;
181 r->idiag_expires = 0;
182 }
183#undef EXPIRES_IN_MS
184
185 if (ext & (1 << (INET_DIAG_INFO - 1))) {
186 attr = nla_reserve(skb, INET_DIAG_INFO,
187 sizeof(struct tcp_info));
188 if (!attr)
189 goto errout;
190
191 info = nla_data(attr);
192 }
193
194 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
195 if (nla_put_string(skb, INET_DIAG_CONG,
196 icsk->icsk_ca_ops->name) < 0)
197 goto errout;
198
199 handler->idiag_get_info(sk, r, info);
200
201 if (sk->sk_state < TCP_TIME_WAIT &&
202 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
203 icsk->icsk_ca_ops->get_info(sk, ext, skb);
204
205out:
206 nlmsg_end(skb, nlh);
207 return 0;
208
209errout:
210 nlmsg_cancel(skb, nlh);
211 return -EMSGSIZE;
212}
213EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
214
215static int inet_csk_diag_fill(struct sock *sk,
216 struct sk_buff *skb, struct inet_diag_req_v2 *req,
217 struct user_namespace *user_ns,
218 u32 portid, u32 seq, u16 nlmsg_flags,
219 const struct nlmsghdr *unlh)
220{
221 return inet_sk_diag_fill(sk, inet_csk(sk),
222 skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
223}
224
225static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
226 struct sk_buff *skb, struct inet_diag_req_v2 *req,
227 u32 portid, u32 seq, u16 nlmsg_flags,
228 const struct nlmsghdr *unlh)
229{
230 s32 tmo;
231 struct inet_diag_msg *r;
232 struct nlmsghdr *nlh;
233
234 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
235 nlmsg_flags);
236 if (!nlh)
237 return -EMSGSIZE;
238
239 r = nlmsg_data(nlh);
240 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
241
242 tmo = tw->tw_ttd - inet_tw_time_stamp();
243 if (tmo < 0)
244 tmo = 0;
245
246 r->idiag_family = tw->tw_family;
247 r->idiag_retrans = 0;
248
249 r->id.idiag_if = tw->tw_bound_dev_if;
250 sock_diag_save_cookie(tw, r->id.idiag_cookie);
251
252 r->id.idiag_sport = tw->tw_sport;
253 r->id.idiag_dport = tw->tw_dport;
254
255 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
256 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
257
258 r->id.idiag_src[0] = tw->tw_rcv_saddr;
259 r->id.idiag_dst[0] = tw->tw_daddr;
260
261 r->idiag_state = tw->tw_substate;
262 r->idiag_timer = 3;
263 r->idiag_expires = jiffies_to_msecs(tmo);
264 r->idiag_rqueue = 0;
265 r->idiag_wqueue = 0;
266 r->idiag_uid = 0;
267 r->idiag_inode = 0;
268#if IS_ENABLED(CONFIG_IPV6)
269 if (tw->tw_family == AF_INET6) {
270 *(struct in6_addr *)r->id.idiag_src = tw->tw_v6_rcv_saddr;
271 *(struct in6_addr *)r->id.idiag_dst = tw->tw_v6_daddr;
272 }
273#endif
274
275 nlmsg_end(skb, nlh);
276 return 0;
277}
278
279static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
280 struct inet_diag_req_v2 *r,
281 struct user_namespace *user_ns,
282 u32 portid, u32 seq, u16 nlmsg_flags,
283 const struct nlmsghdr *unlh)
284{
285 if (sk->sk_state == TCP_TIME_WAIT)
286 return inet_twsk_diag_fill(inet_twsk(sk), skb, r, portid, seq,
287 nlmsg_flags, unlh);
288
289 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
290 nlmsg_flags, unlh);
291}
292
293int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
294 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
295{
296 int err;
297 struct sock *sk;
298 struct sk_buff *rep;
299 struct net *net = sock_net(in_skb->sk);
300
301 err = -EINVAL;
302 if (req->sdiag_family == AF_INET) {
303 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
304 req->id.idiag_dport, req->id.idiag_src[0],
305 req->id.idiag_sport, req->id.idiag_if);
306 }
307#if IS_ENABLED(CONFIG_IPV6)
308 else if (req->sdiag_family == AF_INET6) {
309 sk = inet6_lookup(net, hashinfo,
310 (struct in6_addr *)req->id.idiag_dst,
311 req->id.idiag_dport,
312 (struct in6_addr *)req->id.idiag_src,
313 req->id.idiag_sport,
314 req->id.idiag_if);
315 }
316#endif
317 else {
318 goto out_nosk;
319 }
320
321 err = -ENOENT;
322 if (sk == NULL)
323 goto out_nosk;
324
325 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
326 if (err)
327 goto out;
328
329 rep = nlmsg_new(sizeof(struct inet_diag_msg) +
330 sizeof(struct inet_diag_meminfo) +
331 sizeof(struct tcp_info) + 64, GFP_KERNEL);
332 if (!rep) {
333 err = -ENOMEM;
334 goto out;
335 }
336
337 err = sk_diag_fill(sk, rep, req,
338 sk_user_ns(NETLINK_CB(in_skb).sk),
339 NETLINK_CB(in_skb).portid,
340 nlh->nlmsg_seq, 0, nlh);
341 if (err < 0) {
342 WARN_ON(err == -EMSGSIZE);
343 nlmsg_free(rep);
344 goto out;
345 }
346 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
347 MSG_DONTWAIT);
348 if (err > 0)
349 err = 0;
350
351out:
352 if (sk)
353 sock_gen_put(sk);
354
355out_nosk:
356 return err;
357}
358EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
359
360static int inet_diag_get_exact(struct sk_buff *in_skb,
361 const struct nlmsghdr *nlh,
362 struct inet_diag_req_v2 *req)
363{
364 const struct inet_diag_handler *handler;
365 int err;
366
367 handler = inet_diag_lock_handler(req->sdiag_protocol);
368 if (IS_ERR(handler))
369 err = PTR_ERR(handler);
370 else
371 err = handler->dump_one(in_skb, nlh, req);
372 inet_diag_unlock_handler(handler);
373
374 return err;
375}
376
377static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
378{
379 int words = bits >> 5;
380
381 bits &= 0x1f;
382
383 if (words) {
384 if (memcmp(a1, a2, words << 2))
385 return 0;
386 }
387 if (bits) {
388 __be32 w1, w2;
389 __be32 mask;
390
391 w1 = a1[words];
392 w2 = a2[words];
393
394 mask = htonl((0xffffffff) << (32 - bits));
395
396 if ((w1 ^ w2) & mask)
397 return 0;
398 }
399
400 return 1;
401}
402
403
404static int inet_diag_bc_run(const struct nlattr *_bc,
405 const struct inet_diag_entry *entry)
406{
407 const void *bc = nla_data(_bc);
408 int len = nla_len(_bc);
409
410 while (len > 0) {
411 int yes = 1;
412 const struct inet_diag_bc_op *op = bc;
413
414 switch (op->code) {
415 case INET_DIAG_BC_NOP:
416 break;
417 case INET_DIAG_BC_JMP:
418 yes = 0;
419 break;
420 case INET_DIAG_BC_S_GE:
421 yes = entry->sport >= op[1].no;
422 break;
423 case INET_DIAG_BC_S_LE:
424 yes = entry->sport <= op[1].no;
425 break;
426 case INET_DIAG_BC_D_GE:
427 yes = entry->dport >= op[1].no;
428 break;
429 case INET_DIAG_BC_D_LE:
430 yes = entry->dport <= op[1].no;
431 break;
432 case INET_DIAG_BC_AUTO:
433 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
434 break;
435 case INET_DIAG_BC_S_COND:
436 case INET_DIAG_BC_D_COND: {
437 struct inet_diag_hostcond *cond;
438 __be32 *addr;
439
440 cond = (struct inet_diag_hostcond *)(op + 1);
441 if (cond->port != -1 &&
442 cond->port != (op->code == INET_DIAG_BC_S_COND ?
443 entry->sport : entry->dport)) {
444 yes = 0;
445 break;
446 }
447
448 if (op->code == INET_DIAG_BC_S_COND)
449 addr = entry->saddr;
450 else
451 addr = entry->daddr;
452
453 if (cond->family != AF_UNSPEC &&
454 cond->family != entry->family) {
455 if (entry->family == AF_INET6 &&
456 cond->family == AF_INET) {
457 if (addr[0] == 0 && addr[1] == 0 &&
458 addr[2] == htonl(0xffff) &&
459 bitstring_match(addr + 3,
460 cond->addr,
461 cond->prefix_len))
462 break;
463 }
464 yes = 0;
465 break;
466 }
467
468 if (cond->prefix_len == 0)
469 break;
470 if (bitstring_match(addr, cond->addr,
471 cond->prefix_len))
472 break;
473 yes = 0;
474 break;
475 }
476 }
477
478 if (yes) {
479 len -= op->yes;
480 bc += op->yes;
481 } else {
482 len -= op->no;
483 bc += op->no;
484 }
485 }
486 return len == 0;
487}
488
489int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
490{
491 struct inet_diag_entry entry;
492 struct inet_sock *inet = inet_sk(sk);
493
494 if (bc == NULL)
495 return 1;
496
497 entry.family = sk->sk_family;
498#if IS_ENABLED(CONFIG_IPV6)
499 if (entry.family == AF_INET6) {
500
501 entry.saddr = sk->sk_v6_rcv_saddr.s6_addr32;
502 entry.daddr = sk->sk_v6_daddr.s6_addr32;
503 } else
504#endif
505 {
506 entry.saddr = &inet->inet_rcv_saddr;
507 entry.daddr = &inet->inet_daddr;
508 }
509 entry.sport = inet->inet_num;
510 entry.dport = ntohs(inet->inet_dport);
511 entry.userlocks = (sk->sk_state != TCP_TIME_WAIT) ? sk->sk_userlocks : 0;
512
513 return inet_diag_bc_run(bc, &entry);
514}
515EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
516
517static int valid_cc(const void *bc, int len, int cc)
518{
519 while (len >= 0) {
520 const struct inet_diag_bc_op *op = bc;
521
522 if (cc > len)
523 return 0;
524 if (cc == len)
525 return 1;
526 if (op->yes < 4 || op->yes & 3)
527 return 0;
528 len -= op->yes;
529 bc += op->yes;
530 }
531 return 0;
532}
533
534/* Validate an inet_diag_hostcond. */
535static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
536 int *min_len)
537{
538 int addr_len;
539 struct inet_diag_hostcond *cond;
540
541 /* Check hostcond space. */
542 *min_len += sizeof(struct inet_diag_hostcond);
543 if (len < *min_len)
544 return false;
545 cond = (struct inet_diag_hostcond *)(op + 1);
546
547 /* Check address family and address length. */
548 switch (cond->family) {
549 case AF_UNSPEC:
550 addr_len = 0;
551 break;
552 case AF_INET:
553 addr_len = sizeof(struct in_addr);
554 break;
555 case AF_INET6:
556 addr_len = sizeof(struct in6_addr);
557 break;
558 default:
559 return false;
560 }
561 *min_len += addr_len;
562 if (len < *min_len)
563 return false;
564
565 /* Check prefix length (in bits) vs address length (in bytes). */
566 if (cond->prefix_len > 8 * addr_len)
567 return false;
568
569 return true;
570}
571
572/* Validate a port comparison operator. */
573static inline bool valid_port_comparison(const struct inet_diag_bc_op *op,
574 int len, int *min_len)
575{
576 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
577 *min_len += sizeof(struct inet_diag_bc_op);
578 if (len < *min_len)
579 return false;
580 return true;
581}
582
583static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
584{
585 const void *bc = bytecode;
586 int len = bytecode_len;
587
588 while (len > 0) {
589 const struct inet_diag_bc_op *op = bc;
590 int min_len = sizeof(struct inet_diag_bc_op);
591
592//printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
593 switch (op->code) {
594 case INET_DIAG_BC_S_COND:
595 case INET_DIAG_BC_D_COND:
596 if (!valid_hostcond(bc, len, &min_len))
597 return -EINVAL;
598 break;
599 case INET_DIAG_BC_S_GE:
600 case INET_DIAG_BC_S_LE:
601 case INET_DIAG_BC_D_GE:
602 case INET_DIAG_BC_D_LE:
603 if (!valid_port_comparison(bc, len, &min_len))
604 return -EINVAL;
605 break;
606 case INET_DIAG_BC_AUTO:
607 case INET_DIAG_BC_JMP:
608 case INET_DIAG_BC_NOP:
609 break;
610 default:
611 return -EINVAL;
612 }
613
614 if (op->code != INET_DIAG_BC_NOP) {
615 if (op->no < min_len || op->no > len + 4 || op->no & 3)
616 return -EINVAL;
617 if (op->no < len &&
618 !valid_cc(bytecode, bytecode_len, len - op->no))
619 return -EINVAL;
620 }
621
622 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
623 return -EINVAL;
624 bc += op->yes;
625 len -= op->yes;
626 }
627 return len == 0 ? 0 : -EINVAL;
628}
629
630static int inet_csk_diag_dump(struct sock *sk,
631 struct sk_buff *skb,
632 struct netlink_callback *cb,
633 struct inet_diag_req_v2 *r,
634 const struct nlattr *bc)
635{
636 if (!inet_diag_bc_sk(bc, sk))
637 return 0;
638
639 return inet_csk_diag_fill(sk, skb, r,
640 sk_user_ns(NETLINK_CB(cb->skb).sk),
641 NETLINK_CB(cb->skb).portid,
642 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
643}
644
645static void twsk_build_assert(void)
646{
647 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
648 offsetof(struct sock, sk_family));
649
650 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
651 offsetof(struct inet_sock, inet_num));
652
653 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
654 offsetof(struct inet_sock, inet_dport));
655
656 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
657 offsetof(struct inet_sock, inet_rcv_saddr));
658
659 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
660 offsetof(struct inet_sock, inet_daddr));
661
662#if IS_ENABLED(CONFIG_IPV6)
663 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
664 offsetof(struct sock, sk_v6_rcv_saddr));
665
666 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
667 offsetof(struct sock, sk_v6_daddr));
668#endif
669}
670
671static int inet_twsk_diag_dump(struct sock *sk,
672 struct sk_buff *skb,
673 struct netlink_callback *cb,
674 struct inet_diag_req_v2 *r,
675 const struct nlattr *bc)
676{
677 twsk_build_assert();
678
679 if (!inet_diag_bc_sk(bc, sk))
680 return 0;
681
682 return inet_twsk_diag_fill(inet_twsk(sk), skb, r,
683 NETLINK_CB(cb->skb).portid,
684 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
685}
686
687/* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
688 * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
689 */
690static inline void inet_diag_req_addrs(const struct sock *sk,
691 const struct request_sock *req,
692 struct inet_diag_entry *entry)
693{
694 struct inet_request_sock *ireq = inet_rsk(req);
695
696#if IS_ENABLED(CONFIG_IPV6)
697 if (sk->sk_family == AF_INET6) {
698 if (req->rsk_ops->family == AF_INET6) {
699 entry->saddr = ireq->ir_v6_loc_addr.s6_addr32;
700 entry->daddr = ireq->ir_v6_rmt_addr.s6_addr32;
701 } else if (req->rsk_ops->family == AF_INET) {
702 ipv6_addr_set_v4mapped(ireq->ir_loc_addr,
703 &entry->saddr_storage);
704 ipv6_addr_set_v4mapped(ireq->ir_rmt_addr,
705 &entry->daddr_storage);
706 entry->saddr = entry->saddr_storage.s6_addr32;
707 entry->daddr = entry->daddr_storage.s6_addr32;
708 }
709 } else
710#endif
711 {
712 entry->saddr = &ireq->ir_loc_addr;
713 entry->daddr = &ireq->ir_rmt_addr;
714 }
715}
716
717static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
718 struct request_sock *req,
719 struct user_namespace *user_ns,
720 u32 portid, u32 seq,
721 const struct nlmsghdr *unlh)
722{
723 const struct inet_request_sock *ireq = inet_rsk(req);
724 struct inet_sock *inet = inet_sk(sk);
725 struct inet_diag_msg *r;
726 struct nlmsghdr *nlh;
727 long tmo;
728
729 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
730 NLM_F_MULTI);
731 if (!nlh)
732 return -EMSGSIZE;
733
734 r = nlmsg_data(nlh);
735 r->idiag_family = sk->sk_family;
736 r->idiag_state = TCP_SYN_RECV;
737 r->idiag_timer = 1;
738 r->idiag_retrans = req->num_retrans;
739
740 r->id.idiag_if = sk->sk_bound_dev_if;
741 sock_diag_save_cookie(req, r->id.idiag_cookie);
742
743 tmo = req->expires - jiffies;
744 if (tmo < 0)
745 tmo = 0;
746
747 r->id.idiag_sport = inet->inet_sport;
748 r->id.idiag_dport = ireq->ir_rmt_port;
749
750 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
751 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
752
753 r->id.idiag_src[0] = ireq->ir_loc_addr;
754 r->id.idiag_dst[0] = ireq->ir_rmt_addr;
755
756 r->idiag_expires = jiffies_to_msecs(tmo);
757 r->idiag_rqueue = 0;
758 r->idiag_wqueue = 0;
759 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
760 r->idiag_inode = 0;
761#if IS_ENABLED(CONFIG_IPV6)
762 if (r->idiag_family == AF_INET6) {
763 struct inet_diag_entry entry;
764 inet_diag_req_addrs(sk, req, &entry);
765 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
766 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
767 }
768#endif
769
770 nlmsg_end(skb, nlh);
771 return 0;
772}
773
774static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
775 struct netlink_callback *cb,
776 struct inet_diag_req_v2 *r,
777 const struct nlattr *bc)
778{
779 struct inet_diag_entry entry;
780 struct inet_connection_sock *icsk = inet_csk(sk);
781 struct listen_sock *lopt;
782 struct inet_sock *inet = inet_sk(sk);
783 int j, s_j;
784 int reqnum, s_reqnum;
785 int err = 0;
786
787 s_j = cb->args[3];
788 s_reqnum = cb->args[4];
789
790 if (s_j > 0)
791 s_j--;
792
793 entry.family = sk->sk_family;
794
795 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
796
797 lopt = icsk->icsk_accept_queue.listen_opt;
798 if (!lopt || !lopt->qlen)
799 goto out;
800
801 if (bc != NULL) {
802 entry.sport = inet->inet_num;
803 entry.userlocks = sk->sk_userlocks;
804 }
805
806 for (j = s_j; j < lopt->nr_table_entries; j++) {
807 struct request_sock *req, *head = lopt->syn_table[j];
808
809 reqnum = 0;
810 for (req = head; req; reqnum++, req = req->dl_next) {
811 struct inet_request_sock *ireq = inet_rsk(req);
812
813 if (reqnum < s_reqnum)
814 continue;
815 if (r->id.idiag_dport != ireq->ir_rmt_port &&
816 r->id.idiag_dport)
817 continue;
818
819 if (bc) {
820 inet_diag_req_addrs(sk, req, &entry);
821 entry.dport = ntohs(ireq->ir_rmt_port);
822
823 if (!inet_diag_bc_run(bc, &entry))
824 continue;
825 }
826
827 err = inet_diag_fill_req(skb, sk, req,
828 sk_user_ns(NETLINK_CB(cb->skb).sk),
829 NETLINK_CB(cb->skb).portid,
830 cb->nlh->nlmsg_seq, cb->nlh);
831 if (err < 0) {
832 cb->args[3] = j + 1;
833 cb->args[4] = reqnum;
834 goto out;
835 }
836 }
837
838 s_reqnum = 0;
839 }
840
841out:
842 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
843
844 return err;
845}
846
847void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
848 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
849{
850 int i, num;
851 int s_i, s_num;
852 struct net *net = sock_net(skb->sk);
853
854 s_i = cb->args[1];
855 s_num = num = cb->args[2];
856
857 if (cb->args[0] == 0) {
858 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
859 goto skip_listen_ht;
860
861 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
862 struct sock *sk;
863 struct hlist_nulls_node *node;
864 struct inet_listen_hashbucket *ilb;
865
866 num = 0;
867 ilb = &hashinfo->listening_hash[i];
868 spin_lock_bh(&ilb->lock);
869 sk_nulls_for_each(sk, node, &ilb->head) {
870 struct inet_sock *inet = inet_sk(sk);
871
872 if (!net_eq(sock_net(sk), net))
873 continue;
874
875 if (num < s_num) {
876 num++;
877 continue;
878 }
879
880 if (r->sdiag_family != AF_UNSPEC &&
881 sk->sk_family != r->sdiag_family)
882 goto next_listen;
883
884 if (r->id.idiag_sport != inet->inet_sport &&
885 r->id.idiag_sport)
886 goto next_listen;
887
888 if (!(r->idiag_states & TCPF_LISTEN) ||
889 r->id.idiag_dport ||
890 cb->args[3] > 0)
891 goto syn_recv;
892
893 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
894 spin_unlock_bh(&ilb->lock);
895 goto done;
896 }
897
898syn_recv:
899 if (!(r->idiag_states & TCPF_SYN_RECV))
900 goto next_listen;
901
902 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
903 spin_unlock_bh(&ilb->lock);
904 goto done;
905 }
906
907next_listen:
908 cb->args[3] = 0;
909 cb->args[4] = 0;
910 ++num;
911 }
912 spin_unlock_bh(&ilb->lock);
913
914 s_num = 0;
915 cb->args[3] = 0;
916 cb->args[4] = 0;
917 }
918skip_listen_ht:
919 cb->args[0] = 1;
920 s_i = num = s_num = 0;
921 }
922
923 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
924 goto out;
925
926 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
927 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
928 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
929 struct sock *sk;
930 struct hlist_nulls_node *node;
931
932 num = 0;
933
934 if (hlist_nulls_empty(&head->chain))
935 continue;
936
937 if (i > s_i)
938 s_num = 0;
939
940 spin_lock_bh(lock);
941 sk_nulls_for_each(sk, node, &head->chain) {
942 int res;
943 int state;
944
945 if (!net_eq(sock_net(sk), net))
946 continue;
947 if (num < s_num)
948 goto next_normal;
949 state = (sk->sk_state == TCP_TIME_WAIT) ?
950 inet_twsk(sk)->tw_substate : sk->sk_state;
951 if (!(r->idiag_states & (1 << state)))
952 goto next_normal;
953 if (r->sdiag_family != AF_UNSPEC &&
954 sk->sk_family != r->sdiag_family)
955 goto next_normal;
956 if (r->id.idiag_sport != htons(sk->sk_num) &&
957 r->id.idiag_sport)
958 goto next_normal;
959 if (r->id.idiag_dport != sk->sk_dport &&
960 r->id.idiag_dport)
961 goto next_normal;
962 if (sk->sk_state == TCP_TIME_WAIT)
963 res = inet_twsk_diag_dump(sk, skb, cb, r, bc);
964 else
965 res = inet_csk_diag_dump(sk, skb, cb, r, bc);
966 if (res < 0) {
967 spin_unlock_bh(lock);
968 goto done;
969 }
970next_normal:
971 ++num;
972 }
973
974 spin_unlock_bh(lock);
975 }
976
977done:
978 cb->args[1] = i;
979 cb->args[2] = num;
980out:
981 ;
982}
983EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
984
985static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
986 struct inet_diag_req_v2 *r, struct nlattr *bc)
987{
988 const struct inet_diag_handler *handler;
989 int err = 0;
990
991 handler = inet_diag_lock_handler(r->sdiag_protocol);
992 if (!IS_ERR(handler))
993 handler->dump(skb, cb, r, bc);
994 else
995 err = PTR_ERR(handler);
996 inet_diag_unlock_handler(handler);
997
998 return err ? : skb->len;
999}
1000
1001static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1002{
1003 struct nlattr *bc = NULL;
1004 int hdrlen = sizeof(struct inet_diag_req_v2);
1005
1006 if (nlmsg_attrlen(cb->nlh, hdrlen))
1007 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1008
1009 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1010}
1011
1012static inline int inet_diag_type2proto(int type)
1013{
1014 switch (type) {
1015 case TCPDIAG_GETSOCK:
1016 return IPPROTO_TCP;
1017 case DCCPDIAG_GETSOCK:
1018 return IPPROTO_DCCP;
1019 default:
1020 return 0;
1021 }
1022}
1023
1024static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
1025{
1026 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1027 struct inet_diag_req_v2 req;
1028 struct nlattr *bc = NULL;
1029 int hdrlen = sizeof(struct inet_diag_req);
1030
1031 req.sdiag_family = AF_UNSPEC; /* compatibility */
1032 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1033 req.idiag_ext = rc->idiag_ext;
1034 req.idiag_states = rc->idiag_states;
1035 req.id = rc->id;
1036
1037 if (nlmsg_attrlen(cb->nlh, hdrlen))
1038 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1039
1040 return __inet_diag_dump(skb, cb, &req, bc);
1041}
1042
1043static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1044 const struct nlmsghdr *nlh)
1045{
1046 struct inet_diag_req *rc = nlmsg_data(nlh);
1047 struct inet_diag_req_v2 req;
1048
1049 req.sdiag_family = rc->idiag_family;
1050 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1051 req.idiag_ext = rc->idiag_ext;
1052 req.idiag_states = rc->idiag_states;
1053 req.id = rc->id;
1054
1055 return inet_diag_get_exact(in_skb, nlh, &req);
1056}
1057
1058static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1059{
1060 int hdrlen = sizeof(struct inet_diag_req);
1061 struct net *net = sock_net(skb->sk);
1062
1063 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1064 nlmsg_len(nlh) < hdrlen)
1065 return -EINVAL;
1066
1067 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1068 if (nlmsg_attrlen(nlh, hdrlen)) {
1069 struct nlattr *attr;
1070
1071 attr = nlmsg_find_attr(nlh, hdrlen,
1072 INET_DIAG_REQ_BYTECODE);
1073 if (attr == NULL ||
1074 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1075 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1076 return -EINVAL;
1077 }
1078 {
1079 struct netlink_dump_control c = {
1080 .dump = inet_diag_dump_compat,
1081 };
1082 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1083 }
1084 }
1085
1086 return inet_diag_get_exact_compat(skb, nlh);
1087}
1088
1089static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1090{
1091 int hdrlen = sizeof(struct inet_diag_req_v2);
1092 struct net *net = sock_net(skb->sk);
1093
1094 if (nlmsg_len(h) < hdrlen)
1095 return -EINVAL;
1096
1097 if (h->nlmsg_flags & NLM_F_DUMP) {
1098 if (nlmsg_attrlen(h, hdrlen)) {
1099 struct nlattr *attr;
1100 attr = nlmsg_find_attr(h, hdrlen,
1101 INET_DIAG_REQ_BYTECODE);
1102 if (attr == NULL ||
1103 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1104 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1105 return -EINVAL;
1106 }
1107 {
1108 struct netlink_dump_control c = {
1109 .dump = inet_diag_dump,
1110 };
1111 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1112 }
1113 }
1114
1115 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1116}
1117
1118static const struct sock_diag_handler inet_diag_handler = {
1119 .family = AF_INET,
1120 .dump = inet_diag_handler_dump,
1121};
1122
1123static const struct sock_diag_handler inet6_diag_handler = {
1124 .family = AF_INET6,
1125 .dump = inet_diag_handler_dump,
1126};
1127
1128int inet_diag_register(const struct inet_diag_handler *h)
1129{
1130 const __u16 type = h->idiag_type;
1131 int err = -EINVAL;
1132
1133 if (type >= IPPROTO_MAX)
1134 goto out;
1135
1136 mutex_lock(&inet_diag_table_mutex);
1137 err = -EEXIST;
1138 if (inet_diag_table[type] == NULL) {
1139 inet_diag_table[type] = h;
1140 err = 0;
1141 }
1142 mutex_unlock(&inet_diag_table_mutex);
1143out:
1144 return err;
1145}
1146EXPORT_SYMBOL_GPL(inet_diag_register);
1147
1148void inet_diag_unregister(const struct inet_diag_handler *h)
1149{
1150 const __u16 type = h->idiag_type;
1151
1152 if (type >= IPPROTO_MAX)
1153 return;
1154
1155 mutex_lock(&inet_diag_table_mutex);
1156 inet_diag_table[type] = NULL;
1157 mutex_unlock(&inet_diag_table_mutex);
1158}
1159EXPORT_SYMBOL_GPL(inet_diag_unregister);
1160
1161static int __init inet_diag_init(void)
1162{
1163 const int inet_diag_table_size = (IPPROTO_MAX *
1164 sizeof(struct inet_diag_handler *));
1165 int err = -ENOMEM;
1166
1167 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1168 if (!inet_diag_table)
1169 goto out;
1170
1171 err = sock_diag_register(&inet_diag_handler);
1172 if (err)
1173 goto out_free_nl;
1174
1175 err = sock_diag_register(&inet6_diag_handler);
1176 if (err)
1177 goto out_free_inet;
1178
1179 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1180out:
1181 return err;
1182
1183out_free_inet:
1184 sock_diag_unregister(&inet_diag_handler);
1185out_free_nl:
1186 kfree(inet_diag_table);
1187 goto out;
1188}
1189
1190static void __exit inet_diag_exit(void)
1191{
1192 sock_diag_unregister(&inet6_diag_handler);
1193 sock_diag_unregister(&inet_diag_handler);
1194 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1195 kfree(inet_diag_table);
1196}
1197
1198module_init(inet_diag_init);
1199module_exit(inet_diag_exit);
1200MODULE_LICENSE("GPL");
1201MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1202MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
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