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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 return nlmsg_end(skb, nlh);
207
208errout:
209 nlmsg_cancel(skb, nlh);
210 return -EMSGSIZE;
211}
212EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
213
214static int inet_csk_diag_fill(struct sock *sk,
215 struct sk_buff *skb, struct inet_diag_req_v2 *req,
216 struct user_namespace *user_ns,
217 u32 portid, u32 seq, u16 nlmsg_flags,
218 const struct nlmsghdr *unlh)
219{
220 return inet_sk_diag_fill(sk, inet_csk(sk),
221 skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
222}
223
224static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
225 struct sk_buff *skb, struct inet_diag_req_v2 *req,
226 u32 portid, u32 seq, u16 nlmsg_flags,
227 const struct nlmsghdr *unlh)
228{
229 s32 tmo;
230 struct inet_diag_msg *r;
231 struct nlmsghdr *nlh;
232
233 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
234 nlmsg_flags);
235 if (!nlh)
236 return -EMSGSIZE;
237
238 r = nlmsg_data(nlh);
239 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
240
241 tmo = tw->tw_ttd - inet_tw_time_stamp();
242 if (tmo < 0)
243 tmo = 0;
244
245 r->idiag_family = tw->tw_family;
246 r->idiag_retrans = 0;
247
248 r->id.idiag_if = tw->tw_bound_dev_if;
249 sock_diag_save_cookie(tw, r->id.idiag_cookie);
250
251 r->id.idiag_sport = tw->tw_sport;
252 r->id.idiag_dport = tw->tw_dport;
253
254 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
255 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
256
257 r->id.idiag_src[0] = tw->tw_rcv_saddr;
258 r->id.idiag_dst[0] = tw->tw_daddr;
259
260 r->idiag_state = tw->tw_substate;
261 r->idiag_timer = 3;
262 r->idiag_expires = jiffies_to_msecs(tmo);
263 r->idiag_rqueue = 0;
264 r->idiag_wqueue = 0;
265 r->idiag_uid = 0;
266 r->idiag_inode = 0;
267#if IS_ENABLED(CONFIG_IPV6)
268 if (tw->tw_family == AF_INET6) {
269 *(struct in6_addr *)r->id.idiag_src = tw->tw_v6_rcv_saddr;
270 *(struct in6_addr *)r->id.idiag_dst = tw->tw_v6_daddr;
271 }
272#endif
273
274 return nlmsg_end(skb, nlh);
275}
276
277static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
278 struct inet_diag_req_v2 *r,
279 struct user_namespace *user_ns,
280 u32 portid, u32 seq, u16 nlmsg_flags,
281 const struct nlmsghdr *unlh)
282{
283 if (sk->sk_state == TCP_TIME_WAIT)
284 return inet_twsk_diag_fill(inet_twsk(sk), skb, r, portid, seq,
285 nlmsg_flags, unlh);
286
287 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
288 nlmsg_flags, unlh);
289}
290
291int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
292 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
293{
294 int err;
295 struct sock *sk;
296 struct sk_buff *rep;
297 struct net *net = sock_net(in_skb->sk);
298
299 err = -EINVAL;
300 if (req->sdiag_family == AF_INET) {
301 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
302 req->id.idiag_dport, req->id.idiag_src[0],
303 req->id.idiag_sport, req->id.idiag_if);
304 }
305#if IS_ENABLED(CONFIG_IPV6)
306 else if (req->sdiag_family == AF_INET6) {
307 sk = inet6_lookup(net, hashinfo,
308 (struct in6_addr *)req->id.idiag_dst,
309 req->id.idiag_dport,
310 (struct in6_addr *)req->id.idiag_src,
311 req->id.idiag_sport,
312 req->id.idiag_if);
313 }
314#endif
315 else {
316 goto out_nosk;
317 }
318
319 err = -ENOENT;
320 if (sk == NULL)
321 goto out_nosk;
322
323 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
324 if (err)
325 goto out;
326
327 rep = nlmsg_new(sizeof(struct inet_diag_msg) +
328 sizeof(struct inet_diag_meminfo) +
329 sizeof(struct tcp_info) + 64, GFP_KERNEL);
330 if (!rep) {
331 err = -ENOMEM;
332 goto out;
333 }
334
335 err = sk_diag_fill(sk, rep, req,
336 sk_user_ns(NETLINK_CB(in_skb).sk),
337 NETLINK_CB(in_skb).portid,
338 nlh->nlmsg_seq, 0, nlh);
339 if (err < 0) {
340 WARN_ON(err == -EMSGSIZE);
341 nlmsg_free(rep);
342 goto out;
343 }
344 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
345 MSG_DONTWAIT);
346 if (err > 0)
347 err = 0;
348
349out:
350 if (sk)
351 sock_gen_put(sk);
352
353out_nosk:
354 return err;
355}
356EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
357
358static int inet_diag_get_exact(struct sk_buff *in_skb,
359 const struct nlmsghdr *nlh,
360 struct inet_diag_req_v2 *req)
361{
362 const struct inet_diag_handler *handler;
363 int err;
364
365 handler = inet_diag_lock_handler(req->sdiag_protocol);
366 if (IS_ERR(handler))
367 err = PTR_ERR(handler);
368 else
369 err = handler->dump_one(in_skb, nlh, req);
370 inet_diag_unlock_handler(handler);
371
372 return err;
373}
374
375static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
376{
377 int words = bits >> 5;
378
379 bits &= 0x1f;
380
381 if (words) {
382 if (memcmp(a1, a2, words << 2))
383 return 0;
384 }
385 if (bits) {
386 __be32 w1, w2;
387 __be32 mask;
388
389 w1 = a1[words];
390 w2 = a2[words];
391
392 mask = htonl((0xffffffff) << (32 - bits));
393
394 if ((w1 ^ w2) & mask)
395 return 0;
396 }
397
398 return 1;
399}
400
401
402static int inet_diag_bc_run(const struct nlattr *_bc,
403 const struct inet_diag_entry *entry)
404{
405 const void *bc = nla_data(_bc);
406 int len = nla_len(_bc);
407
408 while (len > 0) {
409 int yes = 1;
410 const struct inet_diag_bc_op *op = bc;
411
412 switch (op->code) {
413 case INET_DIAG_BC_NOP:
414 break;
415 case INET_DIAG_BC_JMP:
416 yes = 0;
417 break;
418 case INET_DIAG_BC_S_GE:
419 yes = entry->sport >= op[1].no;
420 break;
421 case INET_DIAG_BC_S_LE:
422 yes = entry->sport <= op[1].no;
423 break;
424 case INET_DIAG_BC_D_GE:
425 yes = entry->dport >= op[1].no;
426 break;
427 case INET_DIAG_BC_D_LE:
428 yes = entry->dport <= op[1].no;
429 break;
430 case INET_DIAG_BC_AUTO:
431 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
432 break;
433 case INET_DIAG_BC_S_COND:
434 case INET_DIAG_BC_D_COND: {
435 struct inet_diag_hostcond *cond;
436 __be32 *addr;
437
438 cond = (struct inet_diag_hostcond *)(op + 1);
439 if (cond->port != -1 &&
440 cond->port != (op->code == INET_DIAG_BC_S_COND ?
441 entry->sport : entry->dport)) {
442 yes = 0;
443 break;
444 }
445
446 if (op->code == INET_DIAG_BC_S_COND)
447 addr = entry->saddr;
448 else
449 addr = entry->daddr;
450
451 if (cond->family != AF_UNSPEC &&
452 cond->family != entry->family) {
453 if (entry->family == AF_INET6 &&
454 cond->family == AF_INET) {
455 if (addr[0] == 0 && addr[1] == 0 &&
456 addr[2] == htonl(0xffff) &&
457 bitstring_match(addr + 3,
458 cond->addr,
459 cond->prefix_len))
460 break;
461 }
462 yes = 0;
463 break;
464 }
465
466 if (cond->prefix_len == 0)
467 break;
468 if (bitstring_match(addr, cond->addr,
469 cond->prefix_len))
470 break;
471 yes = 0;
472 break;
473 }
474 }
475
476 if (yes) {
477 len -= op->yes;
478 bc += op->yes;
479 } else {
480 len -= op->no;
481 bc += op->no;
482 }
483 }
484 return len == 0;
485}
486
487int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
488{
489 struct inet_diag_entry entry;
490 struct inet_sock *inet = inet_sk(sk);
491
492 if (bc == NULL)
493 return 1;
494
495 entry.family = sk->sk_family;
496#if IS_ENABLED(CONFIG_IPV6)
497 if (entry.family == AF_INET6) {
498
499 entry.saddr = sk->sk_v6_rcv_saddr.s6_addr32;
500 entry.daddr = sk->sk_v6_daddr.s6_addr32;
501 } else
502#endif
503 {
504 entry.saddr = &inet->inet_rcv_saddr;
505 entry.daddr = &inet->inet_daddr;
506 }
507 entry.sport = inet->inet_num;
508 entry.dport = ntohs(inet->inet_dport);
509 entry.userlocks = sk->sk_userlocks;
510
511 return inet_diag_bc_run(bc, &entry);
512}
513EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
514
515static int valid_cc(const void *bc, int len, int cc)
516{
517 while (len >= 0) {
518 const struct inet_diag_bc_op *op = bc;
519
520 if (cc > len)
521 return 0;
522 if (cc == len)
523 return 1;
524 if (op->yes < 4 || op->yes & 3)
525 return 0;
526 len -= op->yes;
527 bc += op->yes;
528 }
529 return 0;
530}
531
532/* Validate an inet_diag_hostcond. */
533static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
534 int *min_len)
535{
536 int addr_len;
537 struct inet_diag_hostcond *cond;
538
539 /* Check hostcond space. */
540 *min_len += sizeof(struct inet_diag_hostcond);
541 if (len < *min_len)
542 return false;
543 cond = (struct inet_diag_hostcond *)(op + 1);
544
545 /* Check address family and address length. */
546 switch (cond->family) {
547 case AF_UNSPEC:
548 addr_len = 0;
549 break;
550 case AF_INET:
551 addr_len = sizeof(struct in_addr);
552 break;
553 case AF_INET6:
554 addr_len = sizeof(struct in6_addr);
555 break;
556 default:
557 return false;
558 }
559 *min_len += addr_len;
560 if (len < *min_len)
561 return false;
562
563 /* Check prefix length (in bits) vs address length (in bytes). */
564 if (cond->prefix_len > 8 * addr_len)
565 return false;
566
567 return true;
568}
569
570/* Validate a port comparison operator. */
571static inline bool valid_port_comparison(const struct inet_diag_bc_op *op,
572 int len, int *min_len)
573{
574 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
575 *min_len += sizeof(struct inet_diag_bc_op);
576 if (len < *min_len)
577 return false;
578 return true;
579}
580
581static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
582{
583 const void *bc = bytecode;
584 int len = bytecode_len;
585
586 while (len > 0) {
587 const struct inet_diag_bc_op *op = bc;
588 int min_len = sizeof(struct inet_diag_bc_op);
589
590//printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
591 switch (op->code) {
592 case INET_DIAG_BC_S_COND:
593 case INET_DIAG_BC_D_COND:
594 if (!valid_hostcond(bc, len, &min_len))
595 return -EINVAL;
596 break;
597 case INET_DIAG_BC_S_GE:
598 case INET_DIAG_BC_S_LE:
599 case INET_DIAG_BC_D_GE:
600 case INET_DIAG_BC_D_LE:
601 if (!valid_port_comparison(bc, len, &min_len))
602 return -EINVAL;
603 break;
604 case INET_DIAG_BC_AUTO:
605 case INET_DIAG_BC_JMP:
606 case INET_DIAG_BC_NOP:
607 break;
608 default:
609 return -EINVAL;
610 }
611
612 if (op->code != INET_DIAG_BC_NOP) {
613 if (op->no < min_len || op->no > len + 4 || op->no & 3)
614 return -EINVAL;
615 if (op->no < len &&
616 !valid_cc(bytecode, bytecode_len, len - op->no))
617 return -EINVAL;
618 }
619
620 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
621 return -EINVAL;
622 bc += op->yes;
623 len -= op->yes;
624 }
625 return len == 0 ? 0 : -EINVAL;
626}
627
628static int inet_csk_diag_dump(struct sock *sk,
629 struct sk_buff *skb,
630 struct netlink_callback *cb,
631 struct inet_diag_req_v2 *r,
632 const struct nlattr *bc)
633{
634 if (!inet_diag_bc_sk(bc, sk))
635 return 0;
636
637 return inet_csk_diag_fill(sk, skb, r,
638 sk_user_ns(NETLINK_CB(cb->skb).sk),
639 NETLINK_CB(cb->skb).portid,
640 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
641}
642
643static int inet_twsk_diag_dump(struct sock *sk,
644 struct sk_buff *skb,
645 struct netlink_callback *cb,
646 struct inet_diag_req_v2 *r,
647 const struct nlattr *bc)
648{
649 struct inet_timewait_sock *tw = inet_twsk(sk);
650
651 if (bc != NULL) {
652 struct inet_diag_entry entry;
653
654 entry.family = tw->tw_family;
655#if IS_ENABLED(CONFIG_IPV6)
656 if (tw->tw_family == AF_INET6) {
657 entry.saddr = tw->tw_v6_rcv_saddr.s6_addr32;
658 entry.daddr = tw->tw_v6_daddr.s6_addr32;
659 } else
660#endif
661 {
662 entry.saddr = &tw->tw_rcv_saddr;
663 entry.daddr = &tw->tw_daddr;
664 }
665 entry.sport = tw->tw_num;
666 entry.dport = ntohs(tw->tw_dport);
667 entry.userlocks = 0;
668
669 if (!inet_diag_bc_run(bc, &entry))
670 return 0;
671 }
672
673 return inet_twsk_diag_fill(tw, skb, r,
674 NETLINK_CB(cb->skb).portid,
675 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
676}
677
678/* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
679 * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
680 */
681static inline void inet_diag_req_addrs(const struct sock *sk,
682 const struct request_sock *req,
683 struct inet_diag_entry *entry)
684{
685 struct inet_request_sock *ireq = inet_rsk(req);
686
687#if IS_ENABLED(CONFIG_IPV6)
688 if (sk->sk_family == AF_INET6) {
689 if (req->rsk_ops->family == AF_INET6) {
690 entry->saddr = ireq->ir_v6_loc_addr.s6_addr32;
691 entry->daddr = ireq->ir_v6_rmt_addr.s6_addr32;
692 } else if (req->rsk_ops->family == AF_INET) {
693 ipv6_addr_set_v4mapped(ireq->ir_loc_addr,
694 &entry->saddr_storage);
695 ipv6_addr_set_v4mapped(ireq->ir_rmt_addr,
696 &entry->daddr_storage);
697 entry->saddr = entry->saddr_storage.s6_addr32;
698 entry->daddr = entry->daddr_storage.s6_addr32;
699 }
700 } else
701#endif
702 {
703 entry->saddr = &ireq->ir_loc_addr;
704 entry->daddr = &ireq->ir_rmt_addr;
705 }
706}
707
708static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
709 struct request_sock *req,
710 struct user_namespace *user_ns,
711 u32 portid, u32 seq,
712 const struct nlmsghdr *unlh)
713{
714 const struct inet_request_sock *ireq = inet_rsk(req);
715 struct inet_sock *inet = inet_sk(sk);
716 struct inet_diag_msg *r;
717 struct nlmsghdr *nlh;
718 long tmo;
719
720 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
721 NLM_F_MULTI);
722 if (!nlh)
723 return -EMSGSIZE;
724
725 r = nlmsg_data(nlh);
726 r->idiag_family = sk->sk_family;
727 r->idiag_state = TCP_SYN_RECV;
728 r->idiag_timer = 1;
729 r->idiag_retrans = req->num_retrans;
730
731 r->id.idiag_if = sk->sk_bound_dev_if;
732 sock_diag_save_cookie(req, r->id.idiag_cookie);
733
734 tmo = req->expires - jiffies;
735 if (tmo < 0)
736 tmo = 0;
737
738 r->id.idiag_sport = inet->inet_sport;
739 r->id.idiag_dport = ireq->ir_rmt_port;
740
741 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
742 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
743
744 r->id.idiag_src[0] = ireq->ir_loc_addr;
745 r->id.idiag_dst[0] = ireq->ir_rmt_addr;
746
747 r->idiag_expires = jiffies_to_msecs(tmo);
748 r->idiag_rqueue = 0;
749 r->idiag_wqueue = 0;
750 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
751 r->idiag_inode = 0;
752#if IS_ENABLED(CONFIG_IPV6)
753 if (r->idiag_family == AF_INET6) {
754 struct inet_diag_entry entry;
755 inet_diag_req_addrs(sk, req, &entry);
756 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
757 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
758 }
759#endif
760
761 return nlmsg_end(skb, nlh);
762}
763
764static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
765 struct netlink_callback *cb,
766 struct inet_diag_req_v2 *r,
767 const struct nlattr *bc)
768{
769 struct inet_diag_entry entry;
770 struct inet_connection_sock *icsk = inet_csk(sk);
771 struct listen_sock *lopt;
772 struct inet_sock *inet = inet_sk(sk);
773 int j, s_j;
774 int reqnum, s_reqnum;
775 int err = 0;
776
777 s_j = cb->args[3];
778 s_reqnum = cb->args[4];
779
780 if (s_j > 0)
781 s_j--;
782
783 entry.family = sk->sk_family;
784
785 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
786
787 lopt = icsk->icsk_accept_queue.listen_opt;
788 if (!lopt || !lopt->qlen)
789 goto out;
790
791 if (bc != NULL) {
792 entry.sport = inet->inet_num;
793 entry.userlocks = sk->sk_userlocks;
794 }
795
796 for (j = s_j; j < lopt->nr_table_entries; j++) {
797 struct request_sock *req, *head = lopt->syn_table[j];
798
799 reqnum = 0;
800 for (req = head; req; reqnum++, req = req->dl_next) {
801 struct inet_request_sock *ireq = inet_rsk(req);
802
803 if (reqnum < s_reqnum)
804 continue;
805 if (r->id.idiag_dport != ireq->ir_rmt_port &&
806 r->id.idiag_dport)
807 continue;
808
809 if (bc) {
810 inet_diag_req_addrs(sk, req, &entry);
811 entry.dport = ntohs(ireq->ir_rmt_port);
812
813 if (!inet_diag_bc_run(bc, &entry))
814 continue;
815 }
816
817 err = inet_diag_fill_req(skb, sk, req,
818 sk_user_ns(NETLINK_CB(cb->skb).sk),
819 NETLINK_CB(cb->skb).portid,
820 cb->nlh->nlmsg_seq, cb->nlh);
821 if (err < 0) {
822 cb->args[3] = j + 1;
823 cb->args[4] = reqnum;
824 goto out;
825 }
826 }
827
828 s_reqnum = 0;
829 }
830
831out:
832 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
833
834 return err;
835}
836
837void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
838 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
839{
840 int i, num;
841 int s_i, s_num;
842 struct net *net = sock_net(skb->sk);
843
844 s_i = cb->args[1];
845 s_num = num = cb->args[2];
846
847 if (cb->args[0] == 0) {
848 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
849 goto skip_listen_ht;
850
851 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
852 struct sock *sk;
853 struct hlist_nulls_node *node;
854 struct inet_listen_hashbucket *ilb;
855
856 num = 0;
857 ilb = &hashinfo->listening_hash[i];
858 spin_lock_bh(&ilb->lock);
859 sk_nulls_for_each(sk, node, &ilb->head) {
860 struct inet_sock *inet = inet_sk(sk);
861
862 if (!net_eq(sock_net(sk), net))
863 continue;
864
865 if (num < s_num) {
866 num++;
867 continue;
868 }
869
870 if (r->sdiag_family != AF_UNSPEC &&
871 sk->sk_family != r->sdiag_family)
872 goto next_listen;
873
874 if (r->id.idiag_sport != inet->inet_sport &&
875 r->id.idiag_sport)
876 goto next_listen;
877
878 if (!(r->idiag_states & TCPF_LISTEN) ||
879 r->id.idiag_dport ||
880 cb->args[3] > 0)
881 goto syn_recv;
882
883 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
884 spin_unlock_bh(&ilb->lock);
885 goto done;
886 }
887
888syn_recv:
889 if (!(r->idiag_states & TCPF_SYN_RECV))
890 goto next_listen;
891
892 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
893 spin_unlock_bh(&ilb->lock);
894 goto done;
895 }
896
897next_listen:
898 cb->args[3] = 0;
899 cb->args[4] = 0;
900 ++num;
901 }
902 spin_unlock_bh(&ilb->lock);
903
904 s_num = 0;
905 cb->args[3] = 0;
906 cb->args[4] = 0;
907 }
908skip_listen_ht:
909 cb->args[0] = 1;
910 s_i = num = s_num = 0;
911 }
912
913 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
914 goto out;
915
916 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
917 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
918 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
919 struct sock *sk;
920 struct hlist_nulls_node *node;
921
922 num = 0;
923
924 if (hlist_nulls_empty(&head->chain))
925 continue;
926
927 if (i > s_i)
928 s_num = 0;
929
930 spin_lock_bh(lock);
931 sk_nulls_for_each(sk, node, &head->chain) {
932 int res;
933 int state;
934
935 if (!net_eq(sock_net(sk), net))
936 continue;
937 if (num < s_num)
938 goto next_normal;
939 state = (sk->sk_state == TCP_TIME_WAIT) ?
940 inet_twsk(sk)->tw_substate : sk->sk_state;
941 if (!(r->idiag_states & (1 << state)))
942 goto next_normal;
943 if (r->sdiag_family != AF_UNSPEC &&
944 sk->sk_family != r->sdiag_family)
945 goto next_normal;
946 if (r->id.idiag_sport != htons(sk->sk_num) &&
947 r->id.idiag_sport)
948 goto next_normal;
949 if (r->id.idiag_dport != sk->sk_dport &&
950 r->id.idiag_dport)
951 goto next_normal;
952 if (sk->sk_state == TCP_TIME_WAIT)
953 res = inet_twsk_diag_dump(sk, skb, cb, r, bc);
954 else
955 res = inet_csk_diag_dump(sk, skb, cb, r, bc);
956 if (res < 0) {
957 spin_unlock_bh(lock);
958 goto done;
959 }
960next_normal:
961 ++num;
962 }
963
964 spin_unlock_bh(lock);
965 }
966
967done:
968 cb->args[1] = i;
969 cb->args[2] = num;
970out:
971 ;
972}
973EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
974
975static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
976 struct inet_diag_req_v2 *r, struct nlattr *bc)
977{
978 const struct inet_diag_handler *handler;
979 int err = 0;
980
981 handler = inet_diag_lock_handler(r->sdiag_protocol);
982 if (!IS_ERR(handler))
983 handler->dump(skb, cb, r, bc);
984 else
985 err = PTR_ERR(handler);
986 inet_diag_unlock_handler(handler);
987
988 return err ? : skb->len;
989}
990
991static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
992{
993 struct nlattr *bc = NULL;
994 int hdrlen = sizeof(struct inet_diag_req_v2);
995
996 if (nlmsg_attrlen(cb->nlh, hdrlen))
997 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
998
999 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1000}
1001
1002static inline int inet_diag_type2proto(int type)
1003{
1004 switch (type) {
1005 case TCPDIAG_GETSOCK:
1006 return IPPROTO_TCP;
1007 case DCCPDIAG_GETSOCK:
1008 return IPPROTO_DCCP;
1009 default:
1010 return 0;
1011 }
1012}
1013
1014static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
1015{
1016 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1017 struct inet_diag_req_v2 req;
1018 struct nlattr *bc = NULL;
1019 int hdrlen = sizeof(struct inet_diag_req);
1020
1021 req.sdiag_family = AF_UNSPEC; /* compatibility */
1022 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1023 req.idiag_ext = rc->idiag_ext;
1024 req.idiag_states = rc->idiag_states;
1025 req.id = rc->id;
1026
1027 if (nlmsg_attrlen(cb->nlh, hdrlen))
1028 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1029
1030 return __inet_diag_dump(skb, cb, &req, bc);
1031}
1032
1033static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1034 const struct nlmsghdr *nlh)
1035{
1036 struct inet_diag_req *rc = nlmsg_data(nlh);
1037 struct inet_diag_req_v2 req;
1038
1039 req.sdiag_family = rc->idiag_family;
1040 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1041 req.idiag_ext = rc->idiag_ext;
1042 req.idiag_states = rc->idiag_states;
1043 req.id = rc->id;
1044
1045 return inet_diag_get_exact(in_skb, nlh, &req);
1046}
1047
1048static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1049{
1050 int hdrlen = sizeof(struct inet_diag_req);
1051 struct net *net = sock_net(skb->sk);
1052
1053 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1054 nlmsg_len(nlh) < hdrlen)
1055 return -EINVAL;
1056
1057 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1058 if (nlmsg_attrlen(nlh, hdrlen)) {
1059 struct nlattr *attr;
1060
1061 attr = nlmsg_find_attr(nlh, hdrlen,
1062 INET_DIAG_REQ_BYTECODE);
1063 if (attr == NULL ||
1064 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1065 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1066 return -EINVAL;
1067 }
1068 {
1069 struct netlink_dump_control c = {
1070 .dump = inet_diag_dump_compat,
1071 };
1072 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1073 }
1074 }
1075
1076 return inet_diag_get_exact_compat(skb, nlh);
1077}
1078
1079static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1080{
1081 int hdrlen = sizeof(struct inet_diag_req_v2);
1082 struct net *net = sock_net(skb->sk);
1083
1084 if (nlmsg_len(h) < hdrlen)
1085 return -EINVAL;
1086
1087 if (h->nlmsg_flags & NLM_F_DUMP) {
1088 if (nlmsg_attrlen(h, hdrlen)) {
1089 struct nlattr *attr;
1090 attr = nlmsg_find_attr(h, hdrlen,
1091 INET_DIAG_REQ_BYTECODE);
1092 if (attr == NULL ||
1093 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1094 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1095 return -EINVAL;
1096 }
1097 {
1098 struct netlink_dump_control c = {
1099 .dump = inet_diag_dump,
1100 };
1101 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1102 }
1103 }
1104
1105 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1106}
1107
1108static const struct sock_diag_handler inet_diag_handler = {
1109 .family = AF_INET,
1110 .dump = inet_diag_handler_dump,
1111};
1112
1113static const struct sock_diag_handler inet6_diag_handler = {
1114 .family = AF_INET6,
1115 .dump = inet_diag_handler_dump,
1116};
1117
1118int inet_diag_register(const struct inet_diag_handler *h)
1119{
1120 const __u16 type = h->idiag_type;
1121 int err = -EINVAL;
1122
1123 if (type >= IPPROTO_MAX)
1124 goto out;
1125
1126 mutex_lock(&inet_diag_table_mutex);
1127 err = -EEXIST;
1128 if (inet_diag_table[type] == NULL) {
1129 inet_diag_table[type] = h;
1130 err = 0;
1131 }
1132 mutex_unlock(&inet_diag_table_mutex);
1133out:
1134 return err;
1135}
1136EXPORT_SYMBOL_GPL(inet_diag_register);
1137
1138void inet_diag_unregister(const struct inet_diag_handler *h)
1139{
1140 const __u16 type = h->idiag_type;
1141
1142 if (type >= IPPROTO_MAX)
1143 return;
1144
1145 mutex_lock(&inet_diag_table_mutex);
1146 inet_diag_table[type] = NULL;
1147 mutex_unlock(&inet_diag_table_mutex);
1148}
1149EXPORT_SYMBOL_GPL(inet_diag_unregister);
1150
1151static int __init inet_diag_init(void)
1152{
1153 const int inet_diag_table_size = (IPPROTO_MAX *
1154 sizeof(struct inet_diag_handler *));
1155 int err = -ENOMEM;
1156
1157 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1158 if (!inet_diag_table)
1159 goto out;
1160
1161 err = sock_diag_register(&inet_diag_handler);
1162 if (err)
1163 goto out_free_nl;
1164
1165 err = sock_diag_register(&inet6_diag_handler);
1166 if (err)
1167 goto out_free_inet;
1168
1169 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1170out:
1171 return err;
1172
1173out_free_inet:
1174 sock_diag_unregister(&inet_diag_handler);
1175out_free_nl:
1176 kfree(inet_diag_table);
1177 goto out;
1178}
1179
1180static void __exit inet_diag_exit(void)
1181{
1182 sock_diag_unregister(&inet6_diag_handler);
1183 sock_diag_unregister(&inet_diag_handler);
1184 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1185 kfree(inet_diag_table);
1186}
1187
1188module_init(inet_diag_init);
1189module_exit(inet_diag_exit);
1190MODULE_LICENSE("GPL");
1191MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1192MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
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 const __be32 *saddr;
42 const __be32 *daddr;
43 u16 sport;
44 u16 dport;
45 u16 family;
46 u16 userlocks;
47 u32 ifindex;
48 u32 mark;
49};
50
51static DEFINE_MUTEX(inet_diag_table_mutex);
52
53static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
54{
55 if (!inet_diag_table[proto])
56 sock_load_diag_module(AF_INET, proto);
57
58 mutex_lock(&inet_diag_table_mutex);
59 if (!inet_diag_table[proto])
60 return ERR_PTR(-ENOENT);
61
62 return inet_diag_table[proto];
63}
64
65static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
66{
67 mutex_unlock(&inet_diag_table_mutex);
68}
69
70void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
71{
72 r->idiag_family = sk->sk_family;
73
74 r->id.idiag_sport = htons(sk->sk_num);
75 r->id.idiag_dport = sk->sk_dport;
76 r->id.idiag_if = sk->sk_bound_dev_if;
77 sock_diag_save_cookie(sk, r->id.idiag_cookie);
78
79#if IS_ENABLED(CONFIG_IPV6)
80 if (sk->sk_family == AF_INET6) {
81 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
82 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
83 } else
84#endif
85 {
86 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
87 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
88
89 r->id.idiag_src[0] = sk->sk_rcv_saddr;
90 r->id.idiag_dst[0] = sk->sk_daddr;
91 }
92}
93EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
94
95static size_t inet_sk_attr_size(struct sock *sk,
96 const struct inet_diag_req_v2 *req,
97 bool net_admin)
98{
99 const struct inet_diag_handler *handler;
100 size_t aux = 0;
101
102 handler = inet_diag_table[req->sdiag_protocol];
103 if (handler && handler->idiag_get_aux_size)
104 aux = handler->idiag_get_aux_size(sk, net_admin);
105
106 return nla_total_size(sizeof(struct tcp_info))
107 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
108 + nla_total_size(1) /* INET_DIAG_TOS */
109 + nla_total_size(1) /* INET_DIAG_TCLASS */
110 + nla_total_size(4) /* INET_DIAG_MARK */
111 + nla_total_size(sizeof(struct inet_diag_meminfo))
112 + nla_total_size(sizeof(struct inet_diag_msg))
113 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
114 + nla_total_size(TCP_CA_NAME_MAX)
115 + nla_total_size(sizeof(struct tcpvegas_info))
116 + aux
117 + 64;
118}
119
120int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
121 struct inet_diag_msg *r, int ext,
122 struct user_namespace *user_ns,
123 bool net_admin)
124{
125 const struct inet_sock *inet = inet_sk(sk);
126
127 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
128 goto errout;
129
130 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
131 * hence this needs to be included regardless of socket family.
132 */
133 if (ext & (1 << (INET_DIAG_TOS - 1)))
134 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
135 goto errout;
136
137#if IS_ENABLED(CONFIG_IPV6)
138 if (r->idiag_family == AF_INET6) {
139 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
140 if (nla_put_u8(skb, INET_DIAG_TCLASS,
141 inet6_sk(sk)->tclass) < 0)
142 goto errout;
143
144 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
145 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
146 goto errout;
147 }
148#endif
149
150 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
151 goto errout;
152
153 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
154 r->idiag_inode = sock_i_ino(sk);
155
156 return 0;
157errout:
158 return 1;
159}
160EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
161
162int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
163 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
164 struct user_namespace *user_ns,
165 u32 portid, u32 seq, u16 nlmsg_flags,
166 const struct nlmsghdr *unlh,
167 bool net_admin)
168{
169 const struct tcp_congestion_ops *ca_ops;
170 const struct inet_diag_handler *handler;
171 int ext = req->idiag_ext;
172 struct inet_diag_msg *r;
173 struct nlmsghdr *nlh;
174 struct nlattr *attr;
175 void *info = NULL;
176
177 handler = inet_diag_table[req->sdiag_protocol];
178 BUG_ON(!handler);
179
180 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
181 nlmsg_flags);
182 if (!nlh)
183 return -EMSGSIZE;
184
185 r = nlmsg_data(nlh);
186 BUG_ON(!sk_fullsock(sk));
187
188 inet_diag_msg_common_fill(r, sk);
189 r->idiag_state = sk->sk_state;
190 r->idiag_timer = 0;
191 r->idiag_retrans = 0;
192
193 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
194 goto errout;
195
196 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
197 struct inet_diag_meminfo minfo = {
198 .idiag_rmem = sk_rmem_alloc_get(sk),
199 .idiag_wmem = sk->sk_wmem_queued,
200 .idiag_fmem = sk->sk_forward_alloc,
201 .idiag_tmem = sk_wmem_alloc_get(sk),
202 };
203
204 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
205 goto errout;
206 }
207
208 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
209 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
210 goto errout;
211
212 /*
213 * RAW sockets might have user-defined protocols assigned,
214 * so report the one supplied on socket creation.
215 */
216 if (sk->sk_type == SOCK_RAW) {
217 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
218 goto errout;
219 }
220
221 if (!icsk) {
222 handler->idiag_get_info(sk, r, NULL);
223 goto out;
224 }
225
226 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
227 icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
228 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
229 r->idiag_timer = 1;
230 r->idiag_retrans = icsk->icsk_retransmits;
231 r->idiag_expires =
232 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
233 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
234 r->idiag_timer = 4;
235 r->idiag_retrans = icsk->icsk_probes_out;
236 r->idiag_expires =
237 jiffies_to_msecs(icsk->icsk_timeout - jiffies);
238 } else if (timer_pending(&sk->sk_timer)) {
239 r->idiag_timer = 2;
240 r->idiag_retrans = icsk->icsk_probes_out;
241 r->idiag_expires =
242 jiffies_to_msecs(sk->sk_timer.expires - jiffies);
243 } else {
244 r->idiag_timer = 0;
245 r->idiag_expires = 0;
246 }
247
248 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
249 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
250 handler->idiag_info_size,
251 INET_DIAG_PAD);
252 if (!attr)
253 goto errout;
254
255 info = nla_data(attr);
256 }
257
258 if (ext & (1 << (INET_DIAG_CONG - 1))) {
259 int err = 0;
260
261 rcu_read_lock();
262 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
263 if (ca_ops)
264 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
265 rcu_read_unlock();
266 if (err < 0)
267 goto errout;
268 }
269
270 handler->idiag_get_info(sk, r, info);
271
272 if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
273 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
274 goto errout;
275
276 if (sk->sk_state < TCP_TIME_WAIT) {
277 union tcp_cc_info info;
278 size_t sz = 0;
279 int attr;
280
281 rcu_read_lock();
282 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
283 if (ca_ops && ca_ops->get_info)
284 sz = ca_ops->get_info(sk, ext, &attr, &info);
285 rcu_read_unlock();
286 if (sz && nla_put(skb, attr, sz, &info) < 0)
287 goto errout;
288 }
289
290 if (ext & (1 << (INET_DIAG_CLASS_ID - 1))) {
291 u32 classid = 0;
292
293#ifdef CONFIG_SOCK_CGROUP_DATA
294 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
295#endif
296
297 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
298 goto errout;
299 }
300
301out:
302 nlmsg_end(skb, nlh);
303 return 0;
304
305errout:
306 nlmsg_cancel(skb, nlh);
307 return -EMSGSIZE;
308}
309EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
310
311static int inet_csk_diag_fill(struct sock *sk,
312 struct sk_buff *skb,
313 const struct inet_diag_req_v2 *req,
314 struct user_namespace *user_ns,
315 u32 portid, u32 seq, u16 nlmsg_flags,
316 const struct nlmsghdr *unlh,
317 bool net_admin)
318{
319 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
320 portid, seq, nlmsg_flags, unlh, net_admin);
321}
322
323static int inet_twsk_diag_fill(struct sock *sk,
324 struct sk_buff *skb,
325 u32 portid, u32 seq, u16 nlmsg_flags,
326 const struct nlmsghdr *unlh)
327{
328 struct inet_timewait_sock *tw = inet_twsk(sk);
329 struct inet_diag_msg *r;
330 struct nlmsghdr *nlh;
331 long tmo;
332
333 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
334 nlmsg_flags);
335 if (!nlh)
336 return -EMSGSIZE;
337
338 r = nlmsg_data(nlh);
339 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
340
341 tmo = tw->tw_timer.expires - jiffies;
342 if (tmo < 0)
343 tmo = 0;
344
345 inet_diag_msg_common_fill(r, sk);
346 r->idiag_retrans = 0;
347
348 r->idiag_state = tw->tw_substate;
349 r->idiag_timer = 3;
350 r->idiag_expires = jiffies_to_msecs(tmo);
351 r->idiag_rqueue = 0;
352 r->idiag_wqueue = 0;
353 r->idiag_uid = 0;
354 r->idiag_inode = 0;
355
356 nlmsg_end(skb, nlh);
357 return 0;
358}
359
360static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
361 u32 portid, u32 seq, u16 nlmsg_flags,
362 const struct nlmsghdr *unlh, bool net_admin)
363{
364 struct request_sock *reqsk = inet_reqsk(sk);
365 struct inet_diag_msg *r;
366 struct nlmsghdr *nlh;
367 long tmo;
368
369 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
370 nlmsg_flags);
371 if (!nlh)
372 return -EMSGSIZE;
373
374 r = nlmsg_data(nlh);
375 inet_diag_msg_common_fill(r, sk);
376 r->idiag_state = TCP_SYN_RECV;
377 r->idiag_timer = 1;
378 r->idiag_retrans = reqsk->num_retrans;
379
380 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
381 offsetof(struct sock, sk_cookie));
382
383 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
384 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
385 r->idiag_rqueue = 0;
386 r->idiag_wqueue = 0;
387 r->idiag_uid = 0;
388 r->idiag_inode = 0;
389
390 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
391 inet_rsk(reqsk)->ir_mark))
392 return -EMSGSIZE;
393
394 nlmsg_end(skb, nlh);
395 return 0;
396}
397
398static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
399 const struct inet_diag_req_v2 *r,
400 struct user_namespace *user_ns,
401 u32 portid, u32 seq, u16 nlmsg_flags,
402 const struct nlmsghdr *unlh, bool net_admin)
403{
404 if (sk->sk_state == TCP_TIME_WAIT)
405 return inet_twsk_diag_fill(sk, skb, portid, seq,
406 nlmsg_flags, unlh);
407
408 if (sk->sk_state == TCP_NEW_SYN_RECV)
409 return inet_req_diag_fill(sk, skb, portid, seq,
410 nlmsg_flags, unlh, net_admin);
411
412 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
413 nlmsg_flags, unlh, net_admin);
414}
415
416struct sock *inet_diag_find_one_icsk(struct net *net,
417 struct inet_hashinfo *hashinfo,
418 const struct inet_diag_req_v2 *req)
419{
420 struct sock *sk;
421
422 rcu_read_lock();
423 if (req->sdiag_family == AF_INET)
424 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
425 req->id.idiag_dport, req->id.idiag_src[0],
426 req->id.idiag_sport, req->id.idiag_if);
427#if IS_ENABLED(CONFIG_IPV6)
428 else if (req->sdiag_family == AF_INET6) {
429 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
430 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
431 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
432 req->id.idiag_dport, req->id.idiag_src[3],
433 req->id.idiag_sport, req->id.idiag_if);
434 else
435 sk = inet6_lookup(net, hashinfo, NULL, 0,
436 (struct in6_addr *)req->id.idiag_dst,
437 req->id.idiag_dport,
438 (struct in6_addr *)req->id.idiag_src,
439 req->id.idiag_sport,
440 req->id.idiag_if);
441 }
442#endif
443 else {
444 rcu_read_unlock();
445 return ERR_PTR(-EINVAL);
446 }
447 rcu_read_unlock();
448 if (!sk)
449 return ERR_PTR(-ENOENT);
450
451 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
452 sock_gen_put(sk);
453 return ERR_PTR(-ENOENT);
454 }
455
456 return sk;
457}
458EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
459
460int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
461 struct sk_buff *in_skb,
462 const struct nlmsghdr *nlh,
463 const struct inet_diag_req_v2 *req)
464{
465 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
466 struct net *net = sock_net(in_skb->sk);
467 struct sk_buff *rep;
468 struct sock *sk;
469 int err;
470
471 sk = inet_diag_find_one_icsk(net, hashinfo, req);
472 if (IS_ERR(sk))
473 return PTR_ERR(sk);
474
475 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
476 if (!rep) {
477 err = -ENOMEM;
478 goto out;
479 }
480
481 err = sk_diag_fill(sk, rep, req,
482 sk_user_ns(NETLINK_CB(in_skb).sk),
483 NETLINK_CB(in_skb).portid,
484 nlh->nlmsg_seq, 0, nlh, net_admin);
485 if (err < 0) {
486 WARN_ON(err == -EMSGSIZE);
487 nlmsg_free(rep);
488 goto out;
489 }
490 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
491 MSG_DONTWAIT);
492 if (err > 0)
493 err = 0;
494
495out:
496 if (sk)
497 sock_gen_put(sk);
498
499 return err;
500}
501EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
502
503static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
504 const struct nlmsghdr *nlh,
505 const struct inet_diag_req_v2 *req)
506{
507 const struct inet_diag_handler *handler;
508 int err;
509
510 handler = inet_diag_lock_handler(req->sdiag_protocol);
511 if (IS_ERR(handler))
512 err = PTR_ERR(handler);
513 else if (cmd == SOCK_DIAG_BY_FAMILY)
514 err = handler->dump_one(in_skb, nlh, req);
515 else if (cmd == SOCK_DESTROY && handler->destroy)
516 err = handler->destroy(in_skb, req);
517 else
518 err = -EOPNOTSUPP;
519 inet_diag_unlock_handler(handler);
520
521 return err;
522}
523
524static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
525{
526 int words = bits >> 5;
527
528 bits &= 0x1f;
529
530 if (words) {
531 if (memcmp(a1, a2, words << 2))
532 return 0;
533 }
534 if (bits) {
535 __be32 w1, w2;
536 __be32 mask;
537
538 w1 = a1[words];
539 w2 = a2[words];
540
541 mask = htonl((0xffffffff) << (32 - bits));
542
543 if ((w1 ^ w2) & mask)
544 return 0;
545 }
546
547 return 1;
548}
549
550static int inet_diag_bc_run(const struct nlattr *_bc,
551 const struct inet_diag_entry *entry)
552{
553 const void *bc = nla_data(_bc);
554 int len = nla_len(_bc);
555
556 while (len > 0) {
557 int yes = 1;
558 const struct inet_diag_bc_op *op = bc;
559
560 switch (op->code) {
561 case INET_DIAG_BC_NOP:
562 break;
563 case INET_DIAG_BC_JMP:
564 yes = 0;
565 break;
566 case INET_DIAG_BC_S_EQ:
567 yes = entry->sport == op[1].no;
568 break;
569 case INET_DIAG_BC_S_GE:
570 yes = entry->sport >= op[1].no;
571 break;
572 case INET_DIAG_BC_S_LE:
573 yes = entry->sport <= op[1].no;
574 break;
575 case INET_DIAG_BC_D_EQ:
576 yes = entry->dport == op[1].no;
577 break;
578 case INET_DIAG_BC_D_GE:
579 yes = entry->dport >= op[1].no;
580 break;
581 case INET_DIAG_BC_D_LE:
582 yes = entry->dport <= op[1].no;
583 break;
584 case INET_DIAG_BC_AUTO:
585 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
586 break;
587 case INET_DIAG_BC_S_COND:
588 case INET_DIAG_BC_D_COND: {
589 const struct inet_diag_hostcond *cond;
590 const __be32 *addr;
591
592 cond = (const struct inet_diag_hostcond *)(op + 1);
593 if (cond->port != -1 &&
594 cond->port != (op->code == INET_DIAG_BC_S_COND ?
595 entry->sport : entry->dport)) {
596 yes = 0;
597 break;
598 }
599
600 if (op->code == INET_DIAG_BC_S_COND)
601 addr = entry->saddr;
602 else
603 addr = entry->daddr;
604
605 if (cond->family != AF_UNSPEC &&
606 cond->family != entry->family) {
607 if (entry->family == AF_INET6 &&
608 cond->family == AF_INET) {
609 if (addr[0] == 0 && addr[1] == 0 &&
610 addr[2] == htonl(0xffff) &&
611 bitstring_match(addr + 3,
612 cond->addr,
613 cond->prefix_len))
614 break;
615 }
616 yes = 0;
617 break;
618 }
619
620 if (cond->prefix_len == 0)
621 break;
622 if (bitstring_match(addr, cond->addr,
623 cond->prefix_len))
624 break;
625 yes = 0;
626 break;
627 }
628 case INET_DIAG_BC_DEV_COND: {
629 u32 ifindex;
630
631 ifindex = *((const u32 *)(op + 1));
632 if (ifindex != entry->ifindex)
633 yes = 0;
634 break;
635 }
636 case INET_DIAG_BC_MARK_COND: {
637 struct inet_diag_markcond *cond;
638
639 cond = (struct inet_diag_markcond *)(op + 1);
640 if ((entry->mark & cond->mask) != cond->mark)
641 yes = 0;
642 break;
643 }
644 }
645
646 if (yes) {
647 len -= op->yes;
648 bc += op->yes;
649 } else {
650 len -= op->no;
651 bc += op->no;
652 }
653 }
654 return len == 0;
655}
656
657/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
658 */
659static void entry_fill_addrs(struct inet_diag_entry *entry,
660 const struct sock *sk)
661{
662#if IS_ENABLED(CONFIG_IPV6)
663 if (sk->sk_family == AF_INET6) {
664 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
665 entry->daddr = sk->sk_v6_daddr.s6_addr32;
666 } else
667#endif
668 {
669 entry->saddr = &sk->sk_rcv_saddr;
670 entry->daddr = &sk->sk_daddr;
671 }
672}
673
674int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
675{
676 struct inet_sock *inet = inet_sk(sk);
677 struct inet_diag_entry entry;
678
679 if (!bc)
680 return 1;
681
682 entry.family = sk->sk_family;
683 entry_fill_addrs(&entry, sk);
684 entry.sport = inet->inet_num;
685 entry.dport = ntohs(inet->inet_dport);
686 entry.ifindex = sk->sk_bound_dev_if;
687 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
688 if (sk_fullsock(sk))
689 entry.mark = sk->sk_mark;
690 else if (sk->sk_state == TCP_NEW_SYN_RECV)
691 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
692 else
693 entry.mark = 0;
694
695 return inet_diag_bc_run(bc, &entry);
696}
697EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
698
699static int valid_cc(const void *bc, int len, int cc)
700{
701 while (len >= 0) {
702 const struct inet_diag_bc_op *op = bc;
703
704 if (cc > len)
705 return 0;
706 if (cc == len)
707 return 1;
708 if (op->yes < 4 || op->yes & 3)
709 return 0;
710 len -= op->yes;
711 bc += op->yes;
712 }
713 return 0;
714}
715
716/* data is u32 ifindex */
717static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
718 int *min_len)
719{
720 /* Check ifindex space. */
721 *min_len += sizeof(u32);
722 if (len < *min_len)
723 return false;
724
725 return true;
726}
727/* Validate an inet_diag_hostcond. */
728static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
729 int *min_len)
730{
731 struct inet_diag_hostcond *cond;
732 int addr_len;
733
734 /* Check hostcond space. */
735 *min_len += sizeof(struct inet_diag_hostcond);
736 if (len < *min_len)
737 return false;
738 cond = (struct inet_diag_hostcond *)(op + 1);
739
740 /* Check address family and address length. */
741 switch (cond->family) {
742 case AF_UNSPEC:
743 addr_len = 0;
744 break;
745 case AF_INET:
746 addr_len = sizeof(struct in_addr);
747 break;
748 case AF_INET6:
749 addr_len = sizeof(struct in6_addr);
750 break;
751 default:
752 return false;
753 }
754 *min_len += addr_len;
755 if (len < *min_len)
756 return false;
757
758 /* Check prefix length (in bits) vs address length (in bytes). */
759 if (cond->prefix_len > 8 * addr_len)
760 return false;
761
762 return true;
763}
764
765/* Validate a port comparison operator. */
766static bool valid_port_comparison(const struct inet_diag_bc_op *op,
767 int len, int *min_len)
768{
769 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
770 *min_len += sizeof(struct inet_diag_bc_op);
771 if (len < *min_len)
772 return false;
773 return true;
774}
775
776static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
777 int *min_len)
778{
779 *min_len += sizeof(struct inet_diag_markcond);
780 return len >= *min_len;
781}
782
783static int inet_diag_bc_audit(const struct nlattr *attr,
784 const struct sk_buff *skb)
785{
786 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
787 const void *bytecode, *bc;
788 int bytecode_len, len;
789
790 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
791 return -EINVAL;
792
793 bytecode = bc = nla_data(attr);
794 len = bytecode_len = nla_len(attr);
795
796 while (len > 0) {
797 int min_len = sizeof(struct inet_diag_bc_op);
798 const struct inet_diag_bc_op *op = bc;
799
800 switch (op->code) {
801 case INET_DIAG_BC_S_COND:
802 case INET_DIAG_BC_D_COND:
803 if (!valid_hostcond(bc, len, &min_len))
804 return -EINVAL;
805 break;
806 case INET_DIAG_BC_DEV_COND:
807 if (!valid_devcond(bc, len, &min_len))
808 return -EINVAL;
809 break;
810 case INET_DIAG_BC_S_EQ:
811 case INET_DIAG_BC_S_GE:
812 case INET_DIAG_BC_S_LE:
813 case INET_DIAG_BC_D_EQ:
814 case INET_DIAG_BC_D_GE:
815 case INET_DIAG_BC_D_LE:
816 if (!valid_port_comparison(bc, len, &min_len))
817 return -EINVAL;
818 break;
819 case INET_DIAG_BC_MARK_COND:
820 if (!net_admin)
821 return -EPERM;
822 if (!valid_markcond(bc, len, &min_len))
823 return -EINVAL;
824 break;
825 case INET_DIAG_BC_AUTO:
826 case INET_DIAG_BC_JMP:
827 case INET_DIAG_BC_NOP:
828 break;
829 default:
830 return -EINVAL;
831 }
832
833 if (op->code != INET_DIAG_BC_NOP) {
834 if (op->no < min_len || op->no > len + 4 || op->no & 3)
835 return -EINVAL;
836 if (op->no < len &&
837 !valid_cc(bytecode, bytecode_len, len - op->no))
838 return -EINVAL;
839 }
840
841 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
842 return -EINVAL;
843 bc += op->yes;
844 len -= op->yes;
845 }
846 return len == 0 ? 0 : -EINVAL;
847}
848
849static int inet_csk_diag_dump(struct sock *sk,
850 struct sk_buff *skb,
851 struct netlink_callback *cb,
852 const struct inet_diag_req_v2 *r,
853 const struct nlattr *bc,
854 bool net_admin)
855{
856 if (!inet_diag_bc_sk(bc, sk))
857 return 0;
858
859 return inet_csk_diag_fill(sk, skb, r,
860 sk_user_ns(NETLINK_CB(cb->skb).sk),
861 NETLINK_CB(cb->skb).portid,
862 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
863 net_admin);
864}
865
866static void twsk_build_assert(void)
867{
868 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
869 offsetof(struct sock, sk_family));
870
871 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
872 offsetof(struct inet_sock, inet_num));
873
874 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
875 offsetof(struct inet_sock, inet_dport));
876
877 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
878 offsetof(struct inet_sock, inet_rcv_saddr));
879
880 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
881 offsetof(struct inet_sock, inet_daddr));
882
883#if IS_ENABLED(CONFIG_IPV6)
884 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
885 offsetof(struct sock, sk_v6_rcv_saddr));
886
887 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
888 offsetof(struct sock, sk_v6_daddr));
889#endif
890}
891
892void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
893 struct netlink_callback *cb,
894 const struct inet_diag_req_v2 *r, struct nlattr *bc)
895{
896 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
897 struct net *net = sock_net(skb->sk);
898 u32 idiag_states = r->idiag_states;
899 int i, num, s_i, s_num;
900 struct sock *sk;
901
902 if (idiag_states & TCPF_SYN_RECV)
903 idiag_states |= TCPF_NEW_SYN_RECV;
904 s_i = cb->args[1];
905 s_num = num = cb->args[2];
906
907 if (cb->args[0] == 0) {
908 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
909 goto skip_listen_ht;
910
911 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
912 struct inet_listen_hashbucket *ilb;
913
914 num = 0;
915 ilb = &hashinfo->listening_hash[i];
916 spin_lock(&ilb->lock);
917 sk_for_each(sk, &ilb->head) {
918 struct inet_sock *inet = inet_sk(sk);
919
920 if (!net_eq(sock_net(sk), net))
921 continue;
922
923 if (num < s_num) {
924 num++;
925 continue;
926 }
927
928 if (r->sdiag_family != AF_UNSPEC &&
929 sk->sk_family != r->sdiag_family)
930 goto next_listen;
931
932 if (r->id.idiag_sport != inet->inet_sport &&
933 r->id.idiag_sport)
934 goto next_listen;
935
936 if (inet_csk_diag_dump(sk, skb, cb, r,
937 bc, net_admin) < 0) {
938 spin_unlock(&ilb->lock);
939 goto done;
940 }
941
942next_listen:
943 ++num;
944 }
945 spin_unlock(&ilb->lock);
946
947 s_num = 0;
948 }
949skip_listen_ht:
950 cb->args[0] = 1;
951 s_i = num = s_num = 0;
952 }
953
954 if (!(idiag_states & ~TCPF_LISTEN))
955 goto out;
956
957#define SKARR_SZ 16
958 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
959 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
960 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
961 struct hlist_nulls_node *node;
962 struct sock *sk_arr[SKARR_SZ];
963 int num_arr[SKARR_SZ];
964 int idx, accum, res;
965
966 if (hlist_nulls_empty(&head->chain))
967 continue;
968
969 if (i > s_i)
970 s_num = 0;
971
972next_chunk:
973 num = 0;
974 accum = 0;
975 spin_lock_bh(lock);
976 sk_nulls_for_each(sk, node, &head->chain) {
977 int state;
978
979 if (!net_eq(sock_net(sk), net))
980 continue;
981 if (num < s_num)
982 goto next_normal;
983 state = (sk->sk_state == TCP_TIME_WAIT) ?
984 inet_twsk(sk)->tw_substate : sk->sk_state;
985 if (!(idiag_states & (1 << state)))
986 goto next_normal;
987 if (r->sdiag_family != AF_UNSPEC &&
988 sk->sk_family != r->sdiag_family)
989 goto next_normal;
990 if (r->id.idiag_sport != htons(sk->sk_num) &&
991 r->id.idiag_sport)
992 goto next_normal;
993 if (r->id.idiag_dport != sk->sk_dport &&
994 r->id.idiag_dport)
995 goto next_normal;
996 twsk_build_assert();
997
998 if (!inet_diag_bc_sk(bc, sk))
999 goto next_normal;
1000
1001 sock_hold(sk);
1002 num_arr[accum] = num;
1003 sk_arr[accum] = sk;
1004 if (++accum == SKARR_SZ)
1005 break;
1006next_normal:
1007 ++num;
1008 }
1009 spin_unlock_bh(lock);
1010 res = 0;
1011 for (idx = 0; idx < accum; idx++) {
1012 if (res >= 0) {
1013 res = sk_diag_fill(sk_arr[idx], skb, r,
1014 sk_user_ns(NETLINK_CB(cb->skb).sk),
1015 NETLINK_CB(cb->skb).portid,
1016 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1017 cb->nlh, net_admin);
1018 if (res < 0)
1019 num = num_arr[idx];
1020 }
1021 sock_gen_put(sk_arr[idx]);
1022 }
1023 if (res < 0)
1024 break;
1025 cond_resched();
1026 if (accum == SKARR_SZ) {
1027 s_num = num + 1;
1028 goto next_chunk;
1029 }
1030 }
1031
1032done:
1033 cb->args[1] = i;
1034 cb->args[2] = num;
1035out:
1036 ;
1037}
1038EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1039
1040static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1041 const struct inet_diag_req_v2 *r,
1042 struct nlattr *bc)
1043{
1044 const struct inet_diag_handler *handler;
1045 int err = 0;
1046
1047 handler = inet_diag_lock_handler(r->sdiag_protocol);
1048 if (!IS_ERR(handler))
1049 handler->dump(skb, cb, r, bc);
1050 else
1051 err = PTR_ERR(handler);
1052 inet_diag_unlock_handler(handler);
1053
1054 return err ? : skb->len;
1055}
1056
1057static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1058{
1059 int hdrlen = sizeof(struct inet_diag_req_v2);
1060 struct nlattr *bc = NULL;
1061
1062 if (nlmsg_attrlen(cb->nlh, hdrlen))
1063 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1064
1065 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1066}
1067
1068static int inet_diag_type2proto(int type)
1069{
1070 switch (type) {
1071 case TCPDIAG_GETSOCK:
1072 return IPPROTO_TCP;
1073 case DCCPDIAG_GETSOCK:
1074 return IPPROTO_DCCP;
1075 default:
1076 return 0;
1077 }
1078}
1079
1080static int inet_diag_dump_compat(struct sk_buff *skb,
1081 struct netlink_callback *cb)
1082{
1083 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1084 int hdrlen = sizeof(struct inet_diag_req);
1085 struct inet_diag_req_v2 req;
1086 struct nlattr *bc = NULL;
1087
1088 req.sdiag_family = AF_UNSPEC; /* compatibility */
1089 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1090 req.idiag_ext = rc->idiag_ext;
1091 req.idiag_states = rc->idiag_states;
1092 req.id = rc->id;
1093
1094 if (nlmsg_attrlen(cb->nlh, hdrlen))
1095 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1096
1097 return __inet_diag_dump(skb, cb, &req, bc);
1098}
1099
1100static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1101 const struct nlmsghdr *nlh)
1102{
1103 struct inet_diag_req *rc = nlmsg_data(nlh);
1104 struct inet_diag_req_v2 req;
1105
1106 req.sdiag_family = rc->idiag_family;
1107 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1108 req.idiag_ext = rc->idiag_ext;
1109 req.idiag_states = rc->idiag_states;
1110 req.id = rc->id;
1111
1112 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1113}
1114
1115static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1116{
1117 int hdrlen = sizeof(struct inet_diag_req);
1118 struct net *net = sock_net(skb->sk);
1119
1120 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1121 nlmsg_len(nlh) < hdrlen)
1122 return -EINVAL;
1123
1124 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1125 if (nlmsg_attrlen(nlh, hdrlen)) {
1126 struct nlattr *attr;
1127 int err;
1128
1129 attr = nlmsg_find_attr(nlh, hdrlen,
1130 INET_DIAG_REQ_BYTECODE);
1131 err = inet_diag_bc_audit(attr, skb);
1132 if (err)
1133 return err;
1134 }
1135 {
1136 struct netlink_dump_control c = {
1137 .dump = inet_diag_dump_compat,
1138 };
1139 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1140 }
1141 }
1142
1143 return inet_diag_get_exact_compat(skb, nlh);
1144}
1145
1146static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1147{
1148 int hdrlen = sizeof(struct inet_diag_req_v2);
1149 struct net *net = sock_net(skb->sk);
1150
1151 if (nlmsg_len(h) < hdrlen)
1152 return -EINVAL;
1153
1154 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1155 h->nlmsg_flags & NLM_F_DUMP) {
1156 if (nlmsg_attrlen(h, hdrlen)) {
1157 struct nlattr *attr;
1158 int err;
1159
1160 attr = nlmsg_find_attr(h, hdrlen,
1161 INET_DIAG_REQ_BYTECODE);
1162 err = inet_diag_bc_audit(attr, skb);
1163 if (err)
1164 return err;
1165 }
1166 {
1167 struct netlink_dump_control c = {
1168 .dump = inet_diag_dump,
1169 };
1170 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1171 }
1172 }
1173
1174 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1175}
1176
1177static
1178int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1179{
1180 const struct inet_diag_handler *handler;
1181 struct nlmsghdr *nlh;
1182 struct nlattr *attr;
1183 struct inet_diag_msg *r;
1184 void *info = NULL;
1185 int err = 0;
1186
1187 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1188 if (!nlh)
1189 return -ENOMEM;
1190
1191 r = nlmsg_data(nlh);
1192 memset(r, 0, sizeof(*r));
1193 inet_diag_msg_common_fill(r, sk);
1194 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1195 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1196 r->idiag_state = sk->sk_state;
1197
1198 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1199 nlmsg_cancel(skb, nlh);
1200 return err;
1201 }
1202
1203 handler = inet_diag_lock_handler(sk->sk_protocol);
1204 if (IS_ERR(handler)) {
1205 inet_diag_unlock_handler(handler);
1206 nlmsg_cancel(skb, nlh);
1207 return PTR_ERR(handler);
1208 }
1209
1210 attr = handler->idiag_info_size
1211 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1212 handler->idiag_info_size,
1213 INET_DIAG_PAD)
1214 : NULL;
1215 if (attr)
1216 info = nla_data(attr);
1217
1218 handler->idiag_get_info(sk, r, info);
1219 inet_diag_unlock_handler(handler);
1220
1221 nlmsg_end(skb, nlh);
1222 return 0;
1223}
1224
1225static const struct sock_diag_handler inet_diag_handler = {
1226 .family = AF_INET,
1227 .dump = inet_diag_handler_cmd,
1228 .get_info = inet_diag_handler_get_info,
1229 .destroy = inet_diag_handler_cmd,
1230};
1231
1232static const struct sock_diag_handler inet6_diag_handler = {
1233 .family = AF_INET6,
1234 .dump = inet_diag_handler_cmd,
1235 .get_info = inet_diag_handler_get_info,
1236 .destroy = inet_diag_handler_cmd,
1237};
1238
1239int inet_diag_register(const struct inet_diag_handler *h)
1240{
1241 const __u16 type = h->idiag_type;
1242 int err = -EINVAL;
1243
1244 if (type >= IPPROTO_MAX)
1245 goto out;
1246
1247 mutex_lock(&inet_diag_table_mutex);
1248 err = -EEXIST;
1249 if (!inet_diag_table[type]) {
1250 inet_diag_table[type] = h;
1251 err = 0;
1252 }
1253 mutex_unlock(&inet_diag_table_mutex);
1254out:
1255 return err;
1256}
1257EXPORT_SYMBOL_GPL(inet_diag_register);
1258
1259void inet_diag_unregister(const struct inet_diag_handler *h)
1260{
1261 const __u16 type = h->idiag_type;
1262
1263 if (type >= IPPROTO_MAX)
1264 return;
1265
1266 mutex_lock(&inet_diag_table_mutex);
1267 inet_diag_table[type] = NULL;
1268 mutex_unlock(&inet_diag_table_mutex);
1269}
1270EXPORT_SYMBOL_GPL(inet_diag_unregister);
1271
1272static int __init inet_diag_init(void)
1273{
1274 const int inet_diag_table_size = (IPPROTO_MAX *
1275 sizeof(struct inet_diag_handler *));
1276 int err = -ENOMEM;
1277
1278 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1279 if (!inet_diag_table)
1280 goto out;
1281
1282 err = sock_diag_register(&inet_diag_handler);
1283 if (err)
1284 goto out_free_nl;
1285
1286 err = sock_diag_register(&inet6_diag_handler);
1287 if (err)
1288 goto out_free_inet;
1289
1290 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1291out:
1292 return err;
1293
1294out_free_inet:
1295 sock_diag_unregister(&inet_diag_handler);
1296out_free_nl:
1297 kfree(inet_diag_table);
1298 goto out;
1299}
1300
1301static void __exit inet_diag_exit(void)
1302{
1303 sock_diag_unregister(&inet6_diag_handler);
1304 sock_diag_unregister(&inet_diag_handler);
1305 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1306 kfree(inet_diag_table);
1307}
1308
1309module_init(inet_diag_init);
1310module_exit(inet_diag_exit);
1311MODULE_LICENSE("GPL");
1312MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1313MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);