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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};
48
49#define INET_DIAG_PUT(skb, attrtype, attrlen) \
50 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
51
52static DEFINE_MUTEX(inet_diag_table_mutex);
53
54static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
55{
56 if (!inet_diag_table[proto])
57 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
58 NETLINK_SOCK_DIAG, AF_INET, proto);
59
60 mutex_lock(&inet_diag_table_mutex);
61 if (!inet_diag_table[proto])
62 return ERR_PTR(-ENOENT);
63
64 return inet_diag_table[proto];
65}
66
67static inline void inet_diag_unlock_handler(
68 const struct inet_diag_handler *handler)
69{
70 mutex_unlock(&inet_diag_table_mutex);
71}
72
73int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
74 struct sk_buff *skb, struct inet_diag_req_v2 *req,
75 u32 pid, u32 seq, u16 nlmsg_flags,
76 const struct nlmsghdr *unlh)
77{
78 const struct inet_sock *inet = inet_sk(sk);
79 struct inet_diag_msg *r;
80 struct nlmsghdr *nlh;
81 void *info = NULL;
82 struct inet_diag_meminfo *minfo = NULL;
83 unsigned char *b = skb_tail_pointer(skb);
84 const struct inet_diag_handler *handler;
85 int ext = req->idiag_ext;
86
87 handler = inet_diag_table[req->sdiag_protocol];
88 BUG_ON(handler == NULL);
89
90 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
91 nlh->nlmsg_flags = nlmsg_flags;
92
93 r = NLMSG_DATA(nlh);
94 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
95
96 if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
97 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
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 r->id.idiag_src[0] = inet->inet_rcv_saddr;
110 r->id.idiag_dst[0] = inet->inet_daddr;
111
112 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
113 * hence this needs to be included regardless of socket family.
114 */
115 if (ext & (1 << (INET_DIAG_TOS - 1)))
116 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos);
117
118#if IS_ENABLED(CONFIG_IPV6)
119 if (r->idiag_family == AF_INET6) {
120 const struct ipv6_pinfo *np = inet6_sk(sk);
121
122 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
123 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
124 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
125 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass);
126 }
127#endif
128
129 r->idiag_uid = sock_i_uid(sk);
130 r->idiag_inode = sock_i_ino(sk);
131
132 if (minfo) {
133 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
134 minfo->idiag_wmem = sk->sk_wmem_queued;
135 minfo->idiag_fmem = sk->sk_forward_alloc;
136 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
137 }
138
139 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
140 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
141 goto rtattr_failure;
142
143 if (icsk == NULL) {
144 handler->idiag_get_info(sk, r, NULL);
145 goto out;
146 }
147
148#define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
149
150 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
151 r->idiag_timer = 1;
152 r->idiag_retrans = icsk->icsk_retransmits;
153 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
154 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
155 r->idiag_timer = 4;
156 r->idiag_retrans = icsk->icsk_probes_out;
157 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
158 } else if (timer_pending(&sk->sk_timer)) {
159 r->idiag_timer = 2;
160 r->idiag_retrans = icsk->icsk_probes_out;
161 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
162 } else {
163 r->idiag_timer = 0;
164 r->idiag_expires = 0;
165 }
166#undef EXPIRES_IN_MS
167
168 if (ext & (1 << (INET_DIAG_INFO - 1)))
169 info = INET_DIAG_PUT(skb, INET_DIAG_INFO, sizeof(struct tcp_info));
170
171 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
172 const size_t len = strlen(icsk->icsk_ca_ops->name);
173
174 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
175 icsk->icsk_ca_ops->name);
176 }
177
178 handler->idiag_get_info(sk, r, info);
179
180 if (sk->sk_state < TCP_TIME_WAIT &&
181 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
182 icsk->icsk_ca_ops->get_info(sk, ext, skb);
183
184out:
185 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
186 return skb->len;
187
188rtattr_failure:
189nlmsg_failure:
190 nlmsg_trim(skb, b);
191 return -EMSGSIZE;
192}
193EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
194
195static int inet_csk_diag_fill(struct sock *sk,
196 struct sk_buff *skb, struct inet_diag_req_v2 *req,
197 u32 pid, u32 seq, u16 nlmsg_flags,
198 const struct nlmsghdr *unlh)
199{
200 return inet_sk_diag_fill(sk, inet_csk(sk),
201 skb, req, pid, seq, nlmsg_flags, unlh);
202}
203
204static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
205 struct sk_buff *skb, struct inet_diag_req_v2 *req,
206 u32 pid, u32 seq, u16 nlmsg_flags,
207 const struct nlmsghdr *unlh)
208{
209 long tmo;
210 struct inet_diag_msg *r;
211 const unsigned char *previous_tail = skb_tail_pointer(skb);
212 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
213 unlh->nlmsg_type, sizeof(*r));
214
215 r = NLMSG_DATA(nlh);
216 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
217
218 nlh->nlmsg_flags = nlmsg_flags;
219
220 tmo = tw->tw_ttd - jiffies;
221 if (tmo < 0)
222 tmo = 0;
223
224 r->idiag_family = tw->tw_family;
225 r->idiag_retrans = 0;
226 r->id.idiag_if = tw->tw_bound_dev_if;
227 sock_diag_save_cookie(tw, r->id.idiag_cookie);
228 r->id.idiag_sport = tw->tw_sport;
229 r->id.idiag_dport = tw->tw_dport;
230 r->id.idiag_src[0] = tw->tw_rcv_saddr;
231 r->id.idiag_dst[0] = tw->tw_daddr;
232 r->idiag_state = tw->tw_substate;
233 r->idiag_timer = 3;
234 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
235 r->idiag_rqueue = 0;
236 r->idiag_wqueue = 0;
237 r->idiag_uid = 0;
238 r->idiag_inode = 0;
239#if IS_ENABLED(CONFIG_IPV6)
240 if (tw->tw_family == AF_INET6) {
241 const struct inet6_timewait_sock *tw6 =
242 inet6_twsk((struct sock *)tw);
243
244 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
245 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
246 }
247#endif
248 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
249 return skb->len;
250nlmsg_failure:
251 nlmsg_trim(skb, previous_tail);
252 return -EMSGSIZE;
253}
254
255static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
256 struct inet_diag_req_v2 *r, u32 pid, u32 seq, u16 nlmsg_flags,
257 const struct nlmsghdr *unlh)
258{
259 if (sk->sk_state == TCP_TIME_WAIT)
260 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
261 skb, r, pid, seq, nlmsg_flags,
262 unlh);
263 return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh);
264}
265
266int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
267 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
268{
269 int err;
270 struct sock *sk;
271 struct sk_buff *rep;
272
273 err = -EINVAL;
274 if (req->sdiag_family == AF_INET) {
275 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
276 req->id.idiag_dport, req->id.idiag_src[0],
277 req->id.idiag_sport, req->id.idiag_if);
278 }
279#if IS_ENABLED(CONFIG_IPV6)
280 else if (req->sdiag_family == AF_INET6) {
281 sk = inet6_lookup(&init_net, hashinfo,
282 (struct in6_addr *)req->id.idiag_dst,
283 req->id.idiag_dport,
284 (struct in6_addr *)req->id.idiag_src,
285 req->id.idiag_sport,
286 req->id.idiag_if);
287 }
288#endif
289 else {
290 goto out_nosk;
291 }
292
293 err = -ENOENT;
294 if (sk == NULL)
295 goto out_nosk;
296
297 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
298 if (err)
299 goto out;
300
301 err = -ENOMEM;
302 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
303 sizeof(struct inet_diag_meminfo) +
304 sizeof(struct tcp_info) + 64)),
305 GFP_KERNEL);
306 if (!rep)
307 goto out;
308
309 err = sk_diag_fill(sk, rep, req,
310 NETLINK_CB(in_skb).pid,
311 nlh->nlmsg_seq, 0, nlh);
312 if (err < 0) {
313 WARN_ON(err == -EMSGSIZE);
314 kfree_skb(rep);
315 goto out;
316 }
317 err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
318 MSG_DONTWAIT);
319 if (err > 0)
320 err = 0;
321
322out:
323 if (sk) {
324 if (sk->sk_state == TCP_TIME_WAIT)
325 inet_twsk_put((struct inet_timewait_sock *)sk);
326 else
327 sock_put(sk);
328 }
329out_nosk:
330 return err;
331}
332EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
333
334static int inet_diag_get_exact(struct sk_buff *in_skb,
335 const struct nlmsghdr *nlh,
336 struct inet_diag_req_v2 *req)
337{
338 const struct inet_diag_handler *handler;
339 int err;
340
341 handler = inet_diag_lock_handler(req->sdiag_protocol);
342 if (IS_ERR(handler))
343 err = PTR_ERR(handler);
344 else
345 err = handler->dump_one(in_skb, nlh, req);
346 inet_diag_unlock_handler(handler);
347
348 return err;
349}
350
351static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
352{
353 int words = bits >> 5;
354
355 bits &= 0x1f;
356
357 if (words) {
358 if (memcmp(a1, a2, words << 2))
359 return 0;
360 }
361 if (bits) {
362 __be32 w1, w2;
363 __be32 mask;
364
365 w1 = a1[words];
366 w2 = a2[words];
367
368 mask = htonl((0xffffffff) << (32 - bits));
369
370 if ((w1 ^ w2) & mask)
371 return 0;
372 }
373
374 return 1;
375}
376
377
378static int inet_diag_bc_run(const struct nlattr *_bc,
379 const struct inet_diag_entry *entry)
380{
381 const void *bc = nla_data(_bc);
382 int len = nla_len(_bc);
383
384 while (len > 0) {
385 int yes = 1;
386 const struct inet_diag_bc_op *op = bc;
387
388 switch (op->code) {
389 case INET_DIAG_BC_NOP:
390 break;
391 case INET_DIAG_BC_JMP:
392 yes = 0;
393 break;
394 case INET_DIAG_BC_S_GE:
395 yes = entry->sport >= op[1].no;
396 break;
397 case INET_DIAG_BC_S_LE:
398 yes = entry->sport <= op[1].no;
399 break;
400 case INET_DIAG_BC_D_GE:
401 yes = entry->dport >= op[1].no;
402 break;
403 case INET_DIAG_BC_D_LE:
404 yes = entry->dport <= op[1].no;
405 break;
406 case INET_DIAG_BC_AUTO:
407 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
408 break;
409 case INET_DIAG_BC_S_COND:
410 case INET_DIAG_BC_D_COND: {
411 struct inet_diag_hostcond *cond;
412 __be32 *addr;
413
414 cond = (struct inet_diag_hostcond *)(op + 1);
415 if (cond->port != -1 &&
416 cond->port != (op->code == INET_DIAG_BC_S_COND ?
417 entry->sport : entry->dport)) {
418 yes = 0;
419 break;
420 }
421
422 if (cond->prefix_len == 0)
423 break;
424
425 if (op->code == INET_DIAG_BC_S_COND)
426 addr = entry->saddr;
427 else
428 addr = entry->daddr;
429
430 if (bitstring_match(addr, cond->addr,
431 cond->prefix_len))
432 break;
433 if (entry->family == AF_INET6 &&
434 cond->family == AF_INET) {
435 if (addr[0] == 0 && addr[1] == 0 &&
436 addr[2] == htonl(0xffff) &&
437 bitstring_match(addr + 3, cond->addr,
438 cond->prefix_len))
439 break;
440 }
441 yes = 0;
442 break;
443 }
444 }
445
446 if (yes) {
447 len -= op->yes;
448 bc += op->yes;
449 } else {
450 len -= op->no;
451 bc += op->no;
452 }
453 }
454 return len == 0;
455}
456
457int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
458{
459 struct inet_diag_entry entry;
460 struct inet_sock *inet = inet_sk(sk);
461
462 if (bc == NULL)
463 return 1;
464
465 entry.family = sk->sk_family;
466#if IS_ENABLED(CONFIG_IPV6)
467 if (entry.family == AF_INET6) {
468 struct ipv6_pinfo *np = inet6_sk(sk);
469
470 entry.saddr = np->rcv_saddr.s6_addr32;
471 entry.daddr = np->daddr.s6_addr32;
472 } else
473#endif
474 {
475 entry.saddr = &inet->inet_rcv_saddr;
476 entry.daddr = &inet->inet_daddr;
477 }
478 entry.sport = inet->inet_num;
479 entry.dport = ntohs(inet->inet_dport);
480 entry.userlocks = sk->sk_userlocks;
481
482 return inet_diag_bc_run(bc, &entry);
483}
484EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
485
486static int valid_cc(const void *bc, int len, int cc)
487{
488 while (len >= 0) {
489 const struct inet_diag_bc_op *op = bc;
490
491 if (cc > len)
492 return 0;
493 if (cc == len)
494 return 1;
495 if (op->yes < 4 || op->yes & 3)
496 return 0;
497 len -= op->yes;
498 bc += op->yes;
499 }
500 return 0;
501}
502
503static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
504{
505 const void *bc = bytecode;
506 int len = bytecode_len;
507
508 while (len > 0) {
509 const struct inet_diag_bc_op *op = bc;
510
511//printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
512 switch (op->code) {
513 case INET_DIAG_BC_AUTO:
514 case INET_DIAG_BC_S_COND:
515 case INET_DIAG_BC_D_COND:
516 case INET_DIAG_BC_S_GE:
517 case INET_DIAG_BC_S_LE:
518 case INET_DIAG_BC_D_GE:
519 case INET_DIAG_BC_D_LE:
520 case INET_DIAG_BC_JMP:
521 if (op->no < 4 || op->no > len + 4 || op->no & 3)
522 return -EINVAL;
523 if (op->no < len &&
524 !valid_cc(bytecode, bytecode_len, len - op->no))
525 return -EINVAL;
526 break;
527 case INET_DIAG_BC_NOP:
528 break;
529 default:
530 return -EINVAL;
531 }
532 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
533 return -EINVAL;
534 bc += op->yes;
535 len -= op->yes;
536 }
537 return len == 0 ? 0 : -EINVAL;
538}
539
540static int inet_csk_diag_dump(struct sock *sk,
541 struct sk_buff *skb,
542 struct netlink_callback *cb,
543 struct inet_diag_req_v2 *r,
544 const struct nlattr *bc)
545{
546 if (!inet_diag_bc_sk(bc, sk))
547 return 0;
548
549 return inet_csk_diag_fill(sk, skb, r,
550 NETLINK_CB(cb->skb).pid,
551 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
552}
553
554static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
555 struct sk_buff *skb,
556 struct netlink_callback *cb,
557 struct inet_diag_req_v2 *r,
558 const struct nlattr *bc)
559{
560 if (bc != NULL) {
561 struct inet_diag_entry entry;
562
563 entry.family = tw->tw_family;
564#if IS_ENABLED(CONFIG_IPV6)
565 if (tw->tw_family == AF_INET6) {
566 struct inet6_timewait_sock *tw6 =
567 inet6_twsk((struct sock *)tw);
568 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
569 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
570 } else
571#endif
572 {
573 entry.saddr = &tw->tw_rcv_saddr;
574 entry.daddr = &tw->tw_daddr;
575 }
576 entry.sport = tw->tw_num;
577 entry.dport = ntohs(tw->tw_dport);
578 entry.userlocks = 0;
579
580 if (!inet_diag_bc_run(bc, &entry))
581 return 0;
582 }
583
584 return inet_twsk_diag_fill(tw, skb, r,
585 NETLINK_CB(cb->skb).pid,
586 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
587}
588
589static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
590 struct request_sock *req, u32 pid, u32 seq,
591 const struct nlmsghdr *unlh)
592{
593 const struct inet_request_sock *ireq = inet_rsk(req);
594 struct inet_sock *inet = inet_sk(sk);
595 unsigned char *b = skb_tail_pointer(skb);
596 struct inet_diag_msg *r;
597 struct nlmsghdr *nlh;
598 long tmo;
599
600 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
601 nlh->nlmsg_flags = NLM_F_MULTI;
602 r = NLMSG_DATA(nlh);
603
604 r->idiag_family = sk->sk_family;
605 r->idiag_state = TCP_SYN_RECV;
606 r->idiag_timer = 1;
607 r->idiag_retrans = req->retrans;
608
609 r->id.idiag_if = sk->sk_bound_dev_if;
610 sock_diag_save_cookie(req, r->id.idiag_cookie);
611
612 tmo = req->expires - jiffies;
613 if (tmo < 0)
614 tmo = 0;
615
616 r->id.idiag_sport = inet->inet_sport;
617 r->id.idiag_dport = ireq->rmt_port;
618 r->id.idiag_src[0] = ireq->loc_addr;
619 r->id.idiag_dst[0] = ireq->rmt_addr;
620 r->idiag_expires = jiffies_to_msecs(tmo);
621 r->idiag_rqueue = 0;
622 r->idiag_wqueue = 0;
623 r->idiag_uid = sock_i_uid(sk);
624 r->idiag_inode = 0;
625#if IS_ENABLED(CONFIG_IPV6)
626 if (r->idiag_family == AF_INET6) {
627 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr;
628 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
629 }
630#endif
631 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
632
633 return skb->len;
634
635nlmsg_failure:
636 nlmsg_trim(skb, b);
637 return -1;
638}
639
640static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
641 struct netlink_callback *cb,
642 struct inet_diag_req_v2 *r,
643 const struct nlattr *bc)
644{
645 struct inet_diag_entry entry;
646 struct inet_connection_sock *icsk = inet_csk(sk);
647 struct listen_sock *lopt;
648 struct inet_sock *inet = inet_sk(sk);
649 int j, s_j;
650 int reqnum, s_reqnum;
651 int err = 0;
652
653 s_j = cb->args[3];
654 s_reqnum = cb->args[4];
655
656 if (s_j > 0)
657 s_j--;
658
659 entry.family = sk->sk_family;
660
661 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
662
663 lopt = icsk->icsk_accept_queue.listen_opt;
664 if (!lopt || !lopt->qlen)
665 goto out;
666
667 if (bc != NULL) {
668 entry.sport = inet->inet_num;
669 entry.userlocks = sk->sk_userlocks;
670 }
671
672 for (j = s_j; j < lopt->nr_table_entries; j++) {
673 struct request_sock *req, *head = lopt->syn_table[j];
674
675 reqnum = 0;
676 for (req = head; req; reqnum++, req = req->dl_next) {
677 struct inet_request_sock *ireq = inet_rsk(req);
678
679 if (reqnum < s_reqnum)
680 continue;
681 if (r->id.idiag_dport != ireq->rmt_port &&
682 r->id.idiag_dport)
683 continue;
684
685 if (bc) {
686 entry.saddr =
687#if IS_ENABLED(CONFIG_IPV6)
688 (entry.family == AF_INET6) ?
689 inet6_rsk(req)->loc_addr.s6_addr32 :
690#endif
691 &ireq->loc_addr;
692 entry.daddr =
693#if IS_ENABLED(CONFIG_IPV6)
694 (entry.family == AF_INET6) ?
695 inet6_rsk(req)->rmt_addr.s6_addr32 :
696#endif
697 &ireq->rmt_addr;
698 entry.dport = ntohs(ireq->rmt_port);
699
700 if (!inet_diag_bc_run(bc, &entry))
701 continue;
702 }
703
704 err = inet_diag_fill_req(skb, sk, req,
705 NETLINK_CB(cb->skb).pid,
706 cb->nlh->nlmsg_seq, cb->nlh);
707 if (err < 0) {
708 cb->args[3] = j + 1;
709 cb->args[4] = reqnum;
710 goto out;
711 }
712 }
713
714 s_reqnum = 0;
715 }
716
717out:
718 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
719
720 return err;
721}
722
723void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
724 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
725{
726 int i, num;
727 int s_i, s_num;
728
729 s_i = cb->args[1];
730 s_num = num = cb->args[2];
731
732 if (cb->args[0] == 0) {
733 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
734 goto skip_listen_ht;
735
736 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
737 struct sock *sk;
738 struct hlist_nulls_node *node;
739 struct inet_listen_hashbucket *ilb;
740
741 num = 0;
742 ilb = &hashinfo->listening_hash[i];
743 spin_lock_bh(&ilb->lock);
744 sk_nulls_for_each(sk, node, &ilb->head) {
745 struct inet_sock *inet = inet_sk(sk);
746
747 if (num < s_num) {
748 num++;
749 continue;
750 }
751
752 if (r->sdiag_family != AF_UNSPEC &&
753 sk->sk_family != r->sdiag_family)
754 goto next_listen;
755
756 if (r->id.idiag_sport != inet->inet_sport &&
757 r->id.idiag_sport)
758 goto next_listen;
759
760 if (!(r->idiag_states & TCPF_LISTEN) ||
761 r->id.idiag_dport ||
762 cb->args[3] > 0)
763 goto syn_recv;
764
765 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
766 spin_unlock_bh(&ilb->lock);
767 goto done;
768 }
769
770syn_recv:
771 if (!(r->idiag_states & TCPF_SYN_RECV))
772 goto next_listen;
773
774 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
775 spin_unlock_bh(&ilb->lock);
776 goto done;
777 }
778
779next_listen:
780 cb->args[3] = 0;
781 cb->args[4] = 0;
782 ++num;
783 }
784 spin_unlock_bh(&ilb->lock);
785
786 s_num = 0;
787 cb->args[3] = 0;
788 cb->args[4] = 0;
789 }
790skip_listen_ht:
791 cb->args[0] = 1;
792 s_i = num = s_num = 0;
793 }
794
795 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
796 goto out;
797
798 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
799 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
800 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
801 struct sock *sk;
802 struct hlist_nulls_node *node;
803
804 num = 0;
805
806 if (hlist_nulls_empty(&head->chain) &&
807 hlist_nulls_empty(&head->twchain))
808 continue;
809
810 if (i > s_i)
811 s_num = 0;
812
813 spin_lock_bh(lock);
814 sk_nulls_for_each(sk, node, &head->chain) {
815 struct inet_sock *inet = inet_sk(sk);
816
817 if (num < s_num)
818 goto next_normal;
819 if (!(r->idiag_states & (1 << sk->sk_state)))
820 goto next_normal;
821 if (r->sdiag_family != AF_UNSPEC &&
822 sk->sk_family != r->sdiag_family)
823 goto next_normal;
824 if (r->id.idiag_sport != inet->inet_sport &&
825 r->id.idiag_sport)
826 goto next_normal;
827 if (r->id.idiag_dport != inet->inet_dport &&
828 r->id.idiag_dport)
829 goto next_normal;
830 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
831 spin_unlock_bh(lock);
832 goto done;
833 }
834next_normal:
835 ++num;
836 }
837
838 if (r->idiag_states & TCPF_TIME_WAIT) {
839 struct inet_timewait_sock *tw;
840
841 inet_twsk_for_each(tw, node,
842 &head->twchain) {
843
844 if (num < s_num)
845 goto next_dying;
846 if (r->sdiag_family != AF_UNSPEC &&
847 tw->tw_family != r->sdiag_family)
848 goto next_dying;
849 if (r->id.idiag_sport != tw->tw_sport &&
850 r->id.idiag_sport)
851 goto next_dying;
852 if (r->id.idiag_dport != tw->tw_dport &&
853 r->id.idiag_dport)
854 goto next_dying;
855 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
856 spin_unlock_bh(lock);
857 goto done;
858 }
859next_dying:
860 ++num;
861 }
862 }
863 spin_unlock_bh(lock);
864 }
865
866done:
867 cb->args[1] = i;
868 cb->args[2] = num;
869out:
870 ;
871}
872EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
873
874static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
875 struct inet_diag_req_v2 *r, struct nlattr *bc)
876{
877 const struct inet_diag_handler *handler;
878
879 handler = inet_diag_lock_handler(r->sdiag_protocol);
880 if (!IS_ERR(handler))
881 handler->dump(skb, cb, r, bc);
882 inet_diag_unlock_handler(handler);
883
884 return skb->len;
885}
886
887static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
888{
889 struct nlattr *bc = NULL;
890 int hdrlen = sizeof(struct inet_diag_req_v2);
891
892 if (nlmsg_attrlen(cb->nlh, hdrlen))
893 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
894
895 return __inet_diag_dump(skb, cb, (struct inet_diag_req_v2 *)NLMSG_DATA(cb->nlh), bc);
896}
897
898static inline int inet_diag_type2proto(int type)
899{
900 switch (type) {
901 case TCPDIAG_GETSOCK:
902 return IPPROTO_TCP;
903 case DCCPDIAG_GETSOCK:
904 return IPPROTO_DCCP;
905 default:
906 return 0;
907 }
908}
909
910static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
911{
912 struct inet_diag_req *rc = NLMSG_DATA(cb->nlh);
913 struct inet_diag_req_v2 req;
914 struct nlattr *bc = NULL;
915 int hdrlen = sizeof(struct inet_diag_req);
916
917 req.sdiag_family = AF_UNSPEC; /* compatibility */
918 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
919 req.idiag_ext = rc->idiag_ext;
920 req.idiag_states = rc->idiag_states;
921 req.id = rc->id;
922
923 if (nlmsg_attrlen(cb->nlh, hdrlen))
924 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
925
926 return __inet_diag_dump(skb, cb, &req, bc);
927}
928
929static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
930 const struct nlmsghdr *nlh)
931{
932 struct inet_diag_req *rc = NLMSG_DATA(nlh);
933 struct inet_diag_req_v2 req;
934
935 req.sdiag_family = rc->idiag_family;
936 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
937 req.idiag_ext = rc->idiag_ext;
938 req.idiag_states = rc->idiag_states;
939 req.id = rc->id;
940
941 return inet_diag_get_exact(in_skb, nlh, &req);
942}
943
944static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
945{
946 int hdrlen = sizeof(struct inet_diag_req);
947
948 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
949 nlmsg_len(nlh) < hdrlen)
950 return -EINVAL;
951
952 if (nlh->nlmsg_flags & NLM_F_DUMP) {
953 if (nlmsg_attrlen(nlh, hdrlen)) {
954 struct nlattr *attr;
955
956 attr = nlmsg_find_attr(nlh, hdrlen,
957 INET_DIAG_REQ_BYTECODE);
958 if (attr == NULL ||
959 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
960 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
961 return -EINVAL;
962 }
963 {
964 struct netlink_dump_control c = {
965 .dump = inet_diag_dump_compat,
966 };
967 return netlink_dump_start(sock_diag_nlsk, skb, nlh, &c);
968 }
969 }
970
971 return inet_diag_get_exact_compat(skb, nlh);
972}
973
974static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
975{
976 int hdrlen = sizeof(struct inet_diag_req_v2);
977
978 if (nlmsg_len(h) < hdrlen)
979 return -EINVAL;
980
981 if (h->nlmsg_flags & NLM_F_DUMP) {
982 if (nlmsg_attrlen(h, hdrlen)) {
983 struct nlattr *attr;
984 attr = nlmsg_find_attr(h, hdrlen,
985 INET_DIAG_REQ_BYTECODE);
986 if (attr == NULL ||
987 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
988 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
989 return -EINVAL;
990 }
991 {
992 struct netlink_dump_control c = {
993 .dump = inet_diag_dump,
994 };
995 return netlink_dump_start(sock_diag_nlsk, skb, h, &c);
996 }
997 }
998
999 return inet_diag_get_exact(skb, h, (struct inet_diag_req_v2 *)NLMSG_DATA(h));
1000}
1001
1002static const struct sock_diag_handler inet_diag_handler = {
1003 .family = AF_INET,
1004 .dump = inet_diag_handler_dump,
1005};
1006
1007static const struct sock_diag_handler inet6_diag_handler = {
1008 .family = AF_INET6,
1009 .dump = inet_diag_handler_dump,
1010};
1011
1012int inet_diag_register(const struct inet_diag_handler *h)
1013{
1014 const __u16 type = h->idiag_type;
1015 int err = -EINVAL;
1016
1017 if (type >= IPPROTO_MAX)
1018 goto out;
1019
1020 mutex_lock(&inet_diag_table_mutex);
1021 err = -EEXIST;
1022 if (inet_diag_table[type] == NULL) {
1023 inet_diag_table[type] = h;
1024 err = 0;
1025 }
1026 mutex_unlock(&inet_diag_table_mutex);
1027out:
1028 return err;
1029}
1030EXPORT_SYMBOL_GPL(inet_diag_register);
1031
1032void inet_diag_unregister(const struct inet_diag_handler *h)
1033{
1034 const __u16 type = h->idiag_type;
1035
1036 if (type >= IPPROTO_MAX)
1037 return;
1038
1039 mutex_lock(&inet_diag_table_mutex);
1040 inet_diag_table[type] = NULL;
1041 mutex_unlock(&inet_diag_table_mutex);
1042}
1043EXPORT_SYMBOL_GPL(inet_diag_unregister);
1044
1045static int __init inet_diag_init(void)
1046{
1047 const int inet_diag_table_size = (IPPROTO_MAX *
1048 sizeof(struct inet_diag_handler *));
1049 int err = -ENOMEM;
1050
1051 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1052 if (!inet_diag_table)
1053 goto out;
1054
1055 err = sock_diag_register(&inet_diag_handler);
1056 if (err)
1057 goto out_free_nl;
1058
1059 err = sock_diag_register(&inet6_diag_handler);
1060 if (err)
1061 goto out_free_inet;
1062
1063 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1064out:
1065 return err;
1066
1067out_free_inet:
1068 sock_diag_unregister(&inet_diag_handler);
1069out_free_nl:
1070 kfree(inet_diag_table);
1071 goto out;
1072}
1073
1074static void __exit inet_diag_exit(void)
1075{
1076 sock_diag_unregister(&inet6_diag_handler);
1077 sock_diag_unregister(&inet_diag_handler);
1078 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1079 kfree(inet_diag_table);
1080}
1081
1082module_init(inet_diag_init);
1083module_exit(inet_diag_exit);
1084MODULE_LICENSE("GPL");
1085MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1086MODULE_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};
48
49static DEFINE_MUTEX(inet_diag_table_mutex);
50
51static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
52{
53 if (!inet_diag_table[proto])
54 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
55 NETLINK_SOCK_DIAG, AF_INET, proto);
56
57 mutex_lock(&inet_diag_table_mutex);
58 if (!inet_diag_table[proto])
59 return ERR_PTR(-ENOENT);
60
61 return inet_diag_table[proto];
62}
63
64static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
65{
66 mutex_unlock(&inet_diag_table_mutex);
67}
68
69static void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
70{
71 r->idiag_family = sk->sk_family;
72
73 r->id.idiag_sport = htons(sk->sk_num);
74 r->id.idiag_dport = sk->sk_dport;
75 r->id.idiag_if = sk->sk_bound_dev_if;
76 sock_diag_save_cookie(sk, r->id.idiag_cookie);
77
78#if IS_ENABLED(CONFIG_IPV6)
79 if (sk->sk_family == AF_INET6) {
80 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
81 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
82 } else
83#endif
84 {
85 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
86 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
87
88 r->id.idiag_src[0] = sk->sk_rcv_saddr;
89 r->id.idiag_dst[0] = sk->sk_daddr;
90 }
91}
92
93static size_t inet_sk_attr_size(void)
94{
95 return nla_total_size(sizeof(struct tcp_info))
96 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
97 + nla_total_size(1) /* INET_DIAG_TOS */
98 + nla_total_size(1) /* INET_DIAG_TCLASS */
99 + nla_total_size(sizeof(struct inet_diag_meminfo))
100 + nla_total_size(sizeof(struct inet_diag_msg))
101 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
102 + nla_total_size(TCP_CA_NAME_MAX)
103 + nla_total_size(sizeof(struct tcpvegas_info))
104 + 64;
105}
106
107int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
108 struct sk_buff *skb, const struct inet_diag_req_v2 *req,
109 struct user_namespace *user_ns,
110 u32 portid, u32 seq, u16 nlmsg_flags,
111 const struct nlmsghdr *unlh)
112{
113 const struct inet_sock *inet = inet_sk(sk);
114 const struct tcp_congestion_ops *ca_ops;
115 const struct inet_diag_handler *handler;
116 int ext = req->idiag_ext;
117 struct inet_diag_msg *r;
118 struct nlmsghdr *nlh;
119 struct nlattr *attr;
120 void *info = NULL;
121
122 handler = inet_diag_table[req->sdiag_protocol];
123 BUG_ON(!handler);
124
125 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
126 nlmsg_flags);
127 if (!nlh)
128 return -EMSGSIZE;
129
130 r = nlmsg_data(nlh);
131 BUG_ON(!sk_fullsock(sk));
132
133 inet_diag_msg_common_fill(r, sk);
134 r->idiag_state = sk->sk_state;
135 r->idiag_timer = 0;
136 r->idiag_retrans = 0;
137
138 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
139 goto errout;
140
141 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
142 * hence this needs to be included regardless of socket family.
143 */
144 if (ext & (1 << (INET_DIAG_TOS - 1)))
145 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
146 goto errout;
147
148#if IS_ENABLED(CONFIG_IPV6)
149 if (r->idiag_family == AF_INET6) {
150 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
151 if (nla_put_u8(skb, INET_DIAG_TCLASS,
152 inet6_sk(sk)->tclass) < 0)
153 goto errout;
154
155 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
156 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
157 goto errout;
158 }
159#endif
160
161 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
162 r->idiag_inode = sock_i_ino(sk);
163
164 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
165 struct inet_diag_meminfo minfo = {
166 .idiag_rmem = sk_rmem_alloc_get(sk),
167 .idiag_wmem = sk->sk_wmem_queued,
168 .idiag_fmem = sk->sk_forward_alloc,
169 .idiag_tmem = sk_wmem_alloc_get(sk),
170 };
171
172 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
173 goto errout;
174 }
175
176 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
177 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
178 goto errout;
179
180 if (!icsk) {
181 handler->idiag_get_info(sk, r, NULL);
182 goto out;
183 }
184
185#define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
186
187 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
188 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
189 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
190 r->idiag_timer = 1;
191 r->idiag_retrans = icsk->icsk_retransmits;
192 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
193 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
194 r->idiag_timer = 4;
195 r->idiag_retrans = icsk->icsk_probes_out;
196 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
197 } else if (timer_pending(&sk->sk_timer)) {
198 r->idiag_timer = 2;
199 r->idiag_retrans = icsk->icsk_probes_out;
200 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
201 } else {
202 r->idiag_timer = 0;
203 r->idiag_expires = 0;
204 }
205#undef EXPIRES_IN_MS
206
207 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
208 attr = nla_reserve(skb, INET_DIAG_INFO,
209 handler->idiag_info_size);
210 if (!attr)
211 goto errout;
212
213 info = nla_data(attr);
214 }
215
216 if (ext & (1 << (INET_DIAG_CONG - 1))) {
217 int err = 0;
218
219 rcu_read_lock();
220 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
221 if (ca_ops)
222 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
223 rcu_read_unlock();
224 if (err < 0)
225 goto errout;
226 }
227
228 handler->idiag_get_info(sk, r, info);
229
230 if (sk->sk_state < TCP_TIME_WAIT) {
231 union tcp_cc_info info;
232 size_t sz = 0;
233 int attr;
234
235 rcu_read_lock();
236 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
237 if (ca_ops && ca_ops->get_info)
238 sz = ca_ops->get_info(sk, ext, &attr, &info);
239 rcu_read_unlock();
240 if (sz && nla_put(skb, attr, sz, &info) < 0)
241 goto errout;
242 }
243
244out:
245 nlmsg_end(skb, nlh);
246 return 0;
247
248errout:
249 nlmsg_cancel(skb, nlh);
250 return -EMSGSIZE;
251}
252EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
253
254static int inet_csk_diag_fill(struct sock *sk,
255 struct sk_buff *skb,
256 const struct inet_diag_req_v2 *req,
257 struct user_namespace *user_ns,
258 u32 portid, u32 seq, u16 nlmsg_flags,
259 const struct nlmsghdr *unlh)
260{
261 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
262 user_ns, portid, seq, nlmsg_flags, unlh);
263}
264
265static int inet_twsk_diag_fill(struct sock *sk,
266 struct sk_buff *skb,
267 u32 portid, u32 seq, u16 nlmsg_flags,
268 const struct nlmsghdr *unlh)
269{
270 struct inet_timewait_sock *tw = inet_twsk(sk);
271 struct inet_diag_msg *r;
272 struct nlmsghdr *nlh;
273 long tmo;
274
275 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
276 nlmsg_flags);
277 if (!nlh)
278 return -EMSGSIZE;
279
280 r = nlmsg_data(nlh);
281 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
282
283 tmo = tw->tw_timer.expires - jiffies;
284 if (tmo < 0)
285 tmo = 0;
286
287 inet_diag_msg_common_fill(r, sk);
288 r->idiag_retrans = 0;
289
290 r->idiag_state = tw->tw_substate;
291 r->idiag_timer = 3;
292 r->idiag_expires = jiffies_to_msecs(tmo);
293 r->idiag_rqueue = 0;
294 r->idiag_wqueue = 0;
295 r->idiag_uid = 0;
296 r->idiag_inode = 0;
297
298 nlmsg_end(skb, nlh);
299 return 0;
300}
301
302static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
303 u32 portid, u32 seq, u16 nlmsg_flags,
304 const struct nlmsghdr *unlh)
305{
306 struct inet_diag_msg *r;
307 struct nlmsghdr *nlh;
308 long tmo;
309
310 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
311 nlmsg_flags);
312 if (!nlh)
313 return -EMSGSIZE;
314
315 r = nlmsg_data(nlh);
316 inet_diag_msg_common_fill(r, sk);
317 r->idiag_state = TCP_SYN_RECV;
318 r->idiag_timer = 1;
319 r->idiag_retrans = inet_reqsk(sk)->num_retrans;
320
321 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
322 offsetof(struct sock, sk_cookie));
323
324 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
325 r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
326 r->idiag_rqueue = 0;
327 r->idiag_wqueue = 0;
328 r->idiag_uid = 0;
329 r->idiag_inode = 0;
330
331 nlmsg_end(skb, nlh);
332 return 0;
333}
334
335static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
336 const struct inet_diag_req_v2 *r,
337 struct user_namespace *user_ns,
338 u32 portid, u32 seq, u16 nlmsg_flags,
339 const struct nlmsghdr *unlh)
340{
341 if (sk->sk_state == TCP_TIME_WAIT)
342 return inet_twsk_diag_fill(sk, skb, portid, seq,
343 nlmsg_flags, unlh);
344
345 if (sk->sk_state == TCP_NEW_SYN_RECV)
346 return inet_req_diag_fill(sk, skb, portid, seq,
347 nlmsg_flags, unlh);
348
349 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
350 nlmsg_flags, unlh);
351}
352
353struct sock *inet_diag_find_one_icsk(struct net *net,
354 struct inet_hashinfo *hashinfo,
355 const struct inet_diag_req_v2 *req)
356{
357 struct sock *sk;
358
359 if (req->sdiag_family == AF_INET)
360 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
361 req->id.idiag_dport, req->id.idiag_src[0],
362 req->id.idiag_sport, req->id.idiag_if);
363#if IS_ENABLED(CONFIG_IPV6)
364 else if (req->sdiag_family == AF_INET6) {
365 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
366 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
367 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
368 req->id.idiag_dport, req->id.idiag_src[3],
369 req->id.idiag_sport, req->id.idiag_if);
370 else
371 sk = inet6_lookup(net, hashinfo, NULL, 0,
372 (struct in6_addr *)req->id.idiag_dst,
373 req->id.idiag_dport,
374 (struct in6_addr *)req->id.idiag_src,
375 req->id.idiag_sport,
376 req->id.idiag_if);
377 }
378#endif
379 else
380 return ERR_PTR(-EINVAL);
381
382 if (!sk)
383 return ERR_PTR(-ENOENT);
384
385 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
386 sock_gen_put(sk);
387 return ERR_PTR(-ENOENT);
388 }
389
390 return sk;
391}
392EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
393
394int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
395 struct sk_buff *in_skb,
396 const struct nlmsghdr *nlh,
397 const struct inet_diag_req_v2 *req)
398{
399 struct net *net = sock_net(in_skb->sk);
400 struct sk_buff *rep;
401 struct sock *sk;
402 int err;
403
404 sk = inet_diag_find_one_icsk(net, hashinfo, req);
405 if (IS_ERR(sk))
406 return PTR_ERR(sk);
407
408 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
409 if (!rep) {
410 err = -ENOMEM;
411 goto out;
412 }
413
414 err = sk_diag_fill(sk, rep, req,
415 sk_user_ns(NETLINK_CB(in_skb).sk),
416 NETLINK_CB(in_skb).portid,
417 nlh->nlmsg_seq, 0, nlh);
418 if (err < 0) {
419 WARN_ON(err == -EMSGSIZE);
420 nlmsg_free(rep);
421 goto out;
422 }
423 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
424 MSG_DONTWAIT);
425 if (err > 0)
426 err = 0;
427
428out:
429 if (sk)
430 sock_gen_put(sk);
431
432 return err;
433}
434EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
435
436static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
437 const struct nlmsghdr *nlh,
438 const struct inet_diag_req_v2 *req)
439{
440 const struct inet_diag_handler *handler;
441 int err;
442
443 handler = inet_diag_lock_handler(req->sdiag_protocol);
444 if (IS_ERR(handler))
445 err = PTR_ERR(handler);
446 else if (cmd == SOCK_DIAG_BY_FAMILY)
447 err = handler->dump_one(in_skb, nlh, req);
448 else if (cmd == SOCK_DESTROY && handler->destroy)
449 err = handler->destroy(in_skb, req);
450 else
451 err = -EOPNOTSUPP;
452 inet_diag_unlock_handler(handler);
453
454 return err;
455}
456
457static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
458{
459 int words = bits >> 5;
460
461 bits &= 0x1f;
462
463 if (words) {
464 if (memcmp(a1, a2, words << 2))
465 return 0;
466 }
467 if (bits) {
468 __be32 w1, w2;
469 __be32 mask;
470
471 w1 = a1[words];
472 w2 = a2[words];
473
474 mask = htonl((0xffffffff) << (32 - bits));
475
476 if ((w1 ^ w2) & mask)
477 return 0;
478 }
479
480 return 1;
481}
482
483static int inet_diag_bc_run(const struct nlattr *_bc,
484 const struct inet_diag_entry *entry)
485{
486 const void *bc = nla_data(_bc);
487 int len = nla_len(_bc);
488
489 while (len > 0) {
490 int yes = 1;
491 const struct inet_diag_bc_op *op = bc;
492
493 switch (op->code) {
494 case INET_DIAG_BC_NOP:
495 break;
496 case INET_DIAG_BC_JMP:
497 yes = 0;
498 break;
499 case INET_DIAG_BC_S_GE:
500 yes = entry->sport >= op[1].no;
501 break;
502 case INET_DIAG_BC_S_LE:
503 yes = entry->sport <= op[1].no;
504 break;
505 case INET_DIAG_BC_D_GE:
506 yes = entry->dport >= op[1].no;
507 break;
508 case INET_DIAG_BC_D_LE:
509 yes = entry->dport <= op[1].no;
510 break;
511 case INET_DIAG_BC_AUTO:
512 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
513 break;
514 case INET_DIAG_BC_S_COND:
515 case INET_DIAG_BC_D_COND: {
516 const struct inet_diag_hostcond *cond;
517 const __be32 *addr;
518
519 cond = (const struct inet_diag_hostcond *)(op + 1);
520 if (cond->port != -1 &&
521 cond->port != (op->code == INET_DIAG_BC_S_COND ?
522 entry->sport : entry->dport)) {
523 yes = 0;
524 break;
525 }
526
527 if (op->code == INET_DIAG_BC_S_COND)
528 addr = entry->saddr;
529 else
530 addr = entry->daddr;
531
532 if (cond->family != AF_UNSPEC &&
533 cond->family != entry->family) {
534 if (entry->family == AF_INET6 &&
535 cond->family == AF_INET) {
536 if (addr[0] == 0 && addr[1] == 0 &&
537 addr[2] == htonl(0xffff) &&
538 bitstring_match(addr + 3,
539 cond->addr,
540 cond->prefix_len))
541 break;
542 }
543 yes = 0;
544 break;
545 }
546
547 if (cond->prefix_len == 0)
548 break;
549 if (bitstring_match(addr, cond->addr,
550 cond->prefix_len))
551 break;
552 yes = 0;
553 break;
554 }
555 }
556
557 if (yes) {
558 len -= op->yes;
559 bc += op->yes;
560 } else {
561 len -= op->no;
562 bc += op->no;
563 }
564 }
565 return len == 0;
566}
567
568/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
569 */
570static void entry_fill_addrs(struct inet_diag_entry *entry,
571 const struct sock *sk)
572{
573#if IS_ENABLED(CONFIG_IPV6)
574 if (sk->sk_family == AF_INET6) {
575 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
576 entry->daddr = sk->sk_v6_daddr.s6_addr32;
577 } else
578#endif
579 {
580 entry->saddr = &sk->sk_rcv_saddr;
581 entry->daddr = &sk->sk_daddr;
582 }
583}
584
585int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
586{
587 struct inet_sock *inet = inet_sk(sk);
588 struct inet_diag_entry entry;
589
590 if (!bc)
591 return 1;
592
593 entry.family = sk->sk_family;
594 entry_fill_addrs(&entry, sk);
595 entry.sport = inet->inet_num;
596 entry.dport = ntohs(inet->inet_dport);
597 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
598
599 return inet_diag_bc_run(bc, &entry);
600}
601EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
602
603static int valid_cc(const void *bc, int len, int cc)
604{
605 while (len >= 0) {
606 const struct inet_diag_bc_op *op = bc;
607
608 if (cc > len)
609 return 0;
610 if (cc == len)
611 return 1;
612 if (op->yes < 4 || op->yes & 3)
613 return 0;
614 len -= op->yes;
615 bc += op->yes;
616 }
617 return 0;
618}
619
620/* Validate an inet_diag_hostcond. */
621static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
622 int *min_len)
623{
624 struct inet_diag_hostcond *cond;
625 int addr_len;
626
627 /* Check hostcond space. */
628 *min_len += sizeof(struct inet_diag_hostcond);
629 if (len < *min_len)
630 return false;
631 cond = (struct inet_diag_hostcond *)(op + 1);
632
633 /* Check address family and address length. */
634 switch (cond->family) {
635 case AF_UNSPEC:
636 addr_len = 0;
637 break;
638 case AF_INET:
639 addr_len = sizeof(struct in_addr);
640 break;
641 case AF_INET6:
642 addr_len = sizeof(struct in6_addr);
643 break;
644 default:
645 return false;
646 }
647 *min_len += addr_len;
648 if (len < *min_len)
649 return false;
650
651 /* Check prefix length (in bits) vs address length (in bytes). */
652 if (cond->prefix_len > 8 * addr_len)
653 return false;
654
655 return true;
656}
657
658/* Validate a port comparison operator. */
659static bool valid_port_comparison(const struct inet_diag_bc_op *op,
660 int len, int *min_len)
661{
662 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
663 *min_len += sizeof(struct inet_diag_bc_op);
664 if (len < *min_len)
665 return false;
666 return true;
667}
668
669static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
670{
671 const void *bc = bytecode;
672 int len = bytecode_len;
673
674 while (len > 0) {
675 int min_len = sizeof(struct inet_diag_bc_op);
676 const struct inet_diag_bc_op *op = bc;
677
678 switch (op->code) {
679 case INET_DIAG_BC_S_COND:
680 case INET_DIAG_BC_D_COND:
681 if (!valid_hostcond(bc, len, &min_len))
682 return -EINVAL;
683 break;
684 case INET_DIAG_BC_S_GE:
685 case INET_DIAG_BC_S_LE:
686 case INET_DIAG_BC_D_GE:
687 case INET_DIAG_BC_D_LE:
688 if (!valid_port_comparison(bc, len, &min_len))
689 return -EINVAL;
690 break;
691 case INET_DIAG_BC_AUTO:
692 case INET_DIAG_BC_JMP:
693 case INET_DIAG_BC_NOP:
694 break;
695 default:
696 return -EINVAL;
697 }
698
699 if (op->code != INET_DIAG_BC_NOP) {
700 if (op->no < min_len || op->no > len + 4 || op->no & 3)
701 return -EINVAL;
702 if (op->no < len &&
703 !valid_cc(bytecode, bytecode_len, len - op->no))
704 return -EINVAL;
705 }
706
707 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
708 return -EINVAL;
709 bc += op->yes;
710 len -= op->yes;
711 }
712 return len == 0 ? 0 : -EINVAL;
713}
714
715static int inet_csk_diag_dump(struct sock *sk,
716 struct sk_buff *skb,
717 struct netlink_callback *cb,
718 const struct inet_diag_req_v2 *r,
719 const struct nlattr *bc)
720{
721 if (!inet_diag_bc_sk(bc, sk))
722 return 0;
723
724 return inet_csk_diag_fill(sk, skb, r,
725 sk_user_ns(NETLINK_CB(cb->skb).sk),
726 NETLINK_CB(cb->skb).portid,
727 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
728}
729
730static void twsk_build_assert(void)
731{
732 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
733 offsetof(struct sock, sk_family));
734
735 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
736 offsetof(struct inet_sock, inet_num));
737
738 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
739 offsetof(struct inet_sock, inet_dport));
740
741 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
742 offsetof(struct inet_sock, inet_rcv_saddr));
743
744 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
745 offsetof(struct inet_sock, inet_daddr));
746
747#if IS_ENABLED(CONFIG_IPV6)
748 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
749 offsetof(struct sock, sk_v6_rcv_saddr));
750
751 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
752 offsetof(struct sock, sk_v6_daddr));
753#endif
754}
755
756void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
757 struct netlink_callback *cb,
758 const struct inet_diag_req_v2 *r, struct nlattr *bc)
759{
760 struct net *net = sock_net(skb->sk);
761 int i, num, s_i, s_num;
762 u32 idiag_states = r->idiag_states;
763
764 if (idiag_states & TCPF_SYN_RECV)
765 idiag_states |= TCPF_NEW_SYN_RECV;
766 s_i = cb->args[1];
767 s_num = num = cb->args[2];
768
769 if (cb->args[0] == 0) {
770 if (!(idiag_states & TCPF_LISTEN))
771 goto skip_listen_ht;
772
773 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
774 struct inet_listen_hashbucket *ilb;
775 struct hlist_nulls_node *node;
776 struct sock *sk;
777
778 num = 0;
779 ilb = &hashinfo->listening_hash[i];
780 spin_lock_bh(&ilb->lock);
781 sk_nulls_for_each(sk, node, &ilb->head) {
782 struct inet_sock *inet = inet_sk(sk);
783
784 if (!net_eq(sock_net(sk), net))
785 continue;
786
787 if (num < s_num) {
788 num++;
789 continue;
790 }
791
792 if (r->sdiag_family != AF_UNSPEC &&
793 sk->sk_family != r->sdiag_family)
794 goto next_listen;
795
796 if (r->id.idiag_sport != inet->inet_sport &&
797 r->id.idiag_sport)
798 goto next_listen;
799
800 if (r->id.idiag_dport ||
801 cb->args[3] > 0)
802 goto next_listen;
803
804 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
805 spin_unlock_bh(&ilb->lock);
806 goto done;
807 }
808
809next_listen:
810 cb->args[3] = 0;
811 cb->args[4] = 0;
812 ++num;
813 }
814 spin_unlock_bh(&ilb->lock);
815
816 s_num = 0;
817 cb->args[3] = 0;
818 cb->args[4] = 0;
819 }
820skip_listen_ht:
821 cb->args[0] = 1;
822 s_i = num = s_num = 0;
823 }
824
825 if (!(idiag_states & ~TCPF_LISTEN))
826 goto out;
827
828 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
829 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
830 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
831 struct hlist_nulls_node *node;
832 struct sock *sk;
833
834 num = 0;
835
836 if (hlist_nulls_empty(&head->chain))
837 continue;
838
839 if (i > s_i)
840 s_num = 0;
841
842 spin_lock_bh(lock);
843 sk_nulls_for_each(sk, node, &head->chain) {
844 int state, res;
845
846 if (!net_eq(sock_net(sk), net))
847 continue;
848 if (num < s_num)
849 goto next_normal;
850 state = (sk->sk_state == TCP_TIME_WAIT) ?
851 inet_twsk(sk)->tw_substate : sk->sk_state;
852 if (!(idiag_states & (1 << state)))
853 goto next_normal;
854 if (r->sdiag_family != AF_UNSPEC &&
855 sk->sk_family != r->sdiag_family)
856 goto next_normal;
857 if (r->id.idiag_sport != htons(sk->sk_num) &&
858 r->id.idiag_sport)
859 goto next_normal;
860 if (r->id.idiag_dport != sk->sk_dport &&
861 r->id.idiag_dport)
862 goto next_normal;
863 twsk_build_assert();
864
865 if (!inet_diag_bc_sk(bc, sk))
866 goto next_normal;
867
868 res = sk_diag_fill(sk, skb, r,
869 sk_user_ns(NETLINK_CB(cb->skb).sk),
870 NETLINK_CB(cb->skb).portid,
871 cb->nlh->nlmsg_seq, NLM_F_MULTI,
872 cb->nlh);
873 if (res < 0) {
874 spin_unlock_bh(lock);
875 goto done;
876 }
877next_normal:
878 ++num;
879 }
880
881 spin_unlock_bh(lock);
882 cond_resched();
883 }
884
885done:
886 cb->args[1] = i;
887 cb->args[2] = num;
888out:
889 ;
890}
891EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
892
893static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
894 const struct inet_diag_req_v2 *r,
895 struct nlattr *bc)
896{
897 const struct inet_diag_handler *handler;
898 int err = 0;
899
900 handler = inet_diag_lock_handler(r->sdiag_protocol);
901 if (!IS_ERR(handler))
902 handler->dump(skb, cb, r, bc);
903 else
904 err = PTR_ERR(handler);
905 inet_diag_unlock_handler(handler);
906
907 return err ? : skb->len;
908}
909
910static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
911{
912 int hdrlen = sizeof(struct inet_diag_req_v2);
913 struct nlattr *bc = NULL;
914
915 if (nlmsg_attrlen(cb->nlh, hdrlen))
916 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
917
918 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
919}
920
921static int inet_diag_type2proto(int type)
922{
923 switch (type) {
924 case TCPDIAG_GETSOCK:
925 return IPPROTO_TCP;
926 case DCCPDIAG_GETSOCK:
927 return IPPROTO_DCCP;
928 default:
929 return 0;
930 }
931}
932
933static int inet_diag_dump_compat(struct sk_buff *skb,
934 struct netlink_callback *cb)
935{
936 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
937 int hdrlen = sizeof(struct inet_diag_req);
938 struct inet_diag_req_v2 req;
939 struct nlattr *bc = NULL;
940
941 req.sdiag_family = AF_UNSPEC; /* compatibility */
942 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
943 req.idiag_ext = rc->idiag_ext;
944 req.idiag_states = rc->idiag_states;
945 req.id = rc->id;
946
947 if (nlmsg_attrlen(cb->nlh, hdrlen))
948 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
949
950 return __inet_diag_dump(skb, cb, &req, bc);
951}
952
953static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
954 const struct nlmsghdr *nlh)
955{
956 struct inet_diag_req *rc = nlmsg_data(nlh);
957 struct inet_diag_req_v2 req;
958
959 req.sdiag_family = rc->idiag_family;
960 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
961 req.idiag_ext = rc->idiag_ext;
962 req.idiag_states = rc->idiag_states;
963 req.id = rc->id;
964
965 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
966}
967
968static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
969{
970 int hdrlen = sizeof(struct inet_diag_req);
971 struct net *net = sock_net(skb->sk);
972
973 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
974 nlmsg_len(nlh) < hdrlen)
975 return -EINVAL;
976
977 if (nlh->nlmsg_flags & NLM_F_DUMP) {
978 if (nlmsg_attrlen(nlh, hdrlen)) {
979 struct nlattr *attr;
980
981 attr = nlmsg_find_attr(nlh, hdrlen,
982 INET_DIAG_REQ_BYTECODE);
983 if (!attr ||
984 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
985 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
986 return -EINVAL;
987 }
988 {
989 struct netlink_dump_control c = {
990 .dump = inet_diag_dump_compat,
991 };
992 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
993 }
994 }
995
996 return inet_diag_get_exact_compat(skb, nlh);
997}
998
999static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1000{
1001 int hdrlen = sizeof(struct inet_diag_req_v2);
1002 struct net *net = sock_net(skb->sk);
1003
1004 if (nlmsg_len(h) < hdrlen)
1005 return -EINVAL;
1006
1007 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1008 h->nlmsg_flags & NLM_F_DUMP) {
1009 if (nlmsg_attrlen(h, hdrlen)) {
1010 struct nlattr *attr;
1011
1012 attr = nlmsg_find_attr(h, hdrlen,
1013 INET_DIAG_REQ_BYTECODE);
1014 if (!attr ||
1015 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1016 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1017 return -EINVAL;
1018 }
1019 {
1020 struct netlink_dump_control c = {
1021 .dump = inet_diag_dump,
1022 };
1023 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1024 }
1025 }
1026
1027 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1028}
1029
1030static
1031int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1032{
1033 const struct inet_diag_handler *handler;
1034 struct nlmsghdr *nlh;
1035 struct nlattr *attr;
1036 struct inet_diag_msg *r;
1037 void *info = NULL;
1038 int err = 0;
1039
1040 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1041 if (!nlh)
1042 return -ENOMEM;
1043
1044 r = nlmsg_data(nlh);
1045 memset(r, 0, sizeof(*r));
1046 inet_diag_msg_common_fill(r, sk);
1047 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1048 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1049 r->idiag_state = sk->sk_state;
1050
1051 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1052 nlmsg_cancel(skb, nlh);
1053 return err;
1054 }
1055
1056 handler = inet_diag_lock_handler(sk->sk_protocol);
1057 if (IS_ERR(handler)) {
1058 inet_diag_unlock_handler(handler);
1059 nlmsg_cancel(skb, nlh);
1060 return PTR_ERR(handler);
1061 }
1062
1063 attr = handler->idiag_info_size
1064 ? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size)
1065 : NULL;
1066 if (attr)
1067 info = nla_data(attr);
1068
1069 handler->idiag_get_info(sk, r, info);
1070 inet_diag_unlock_handler(handler);
1071
1072 nlmsg_end(skb, nlh);
1073 return 0;
1074}
1075
1076static const struct sock_diag_handler inet_diag_handler = {
1077 .family = AF_INET,
1078 .dump = inet_diag_handler_cmd,
1079 .get_info = inet_diag_handler_get_info,
1080 .destroy = inet_diag_handler_cmd,
1081};
1082
1083static const struct sock_diag_handler inet6_diag_handler = {
1084 .family = AF_INET6,
1085 .dump = inet_diag_handler_cmd,
1086 .get_info = inet_diag_handler_get_info,
1087 .destroy = inet_diag_handler_cmd,
1088};
1089
1090int inet_diag_register(const struct inet_diag_handler *h)
1091{
1092 const __u16 type = h->idiag_type;
1093 int err = -EINVAL;
1094
1095 if (type >= IPPROTO_MAX)
1096 goto out;
1097
1098 mutex_lock(&inet_diag_table_mutex);
1099 err = -EEXIST;
1100 if (!inet_diag_table[type]) {
1101 inet_diag_table[type] = h;
1102 err = 0;
1103 }
1104 mutex_unlock(&inet_diag_table_mutex);
1105out:
1106 return err;
1107}
1108EXPORT_SYMBOL_GPL(inet_diag_register);
1109
1110void inet_diag_unregister(const struct inet_diag_handler *h)
1111{
1112 const __u16 type = h->idiag_type;
1113
1114 if (type >= IPPROTO_MAX)
1115 return;
1116
1117 mutex_lock(&inet_diag_table_mutex);
1118 inet_diag_table[type] = NULL;
1119 mutex_unlock(&inet_diag_table_mutex);
1120}
1121EXPORT_SYMBOL_GPL(inet_diag_unregister);
1122
1123static int __init inet_diag_init(void)
1124{
1125 const int inet_diag_table_size = (IPPROTO_MAX *
1126 sizeof(struct inet_diag_handler *));
1127 int err = -ENOMEM;
1128
1129 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1130 if (!inet_diag_table)
1131 goto out;
1132
1133 err = sock_diag_register(&inet_diag_handler);
1134 if (err)
1135 goto out_free_nl;
1136
1137 err = sock_diag_register(&inet6_diag_handler);
1138 if (err)
1139 goto out_free_inet;
1140
1141 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1142out:
1143 return err;
1144
1145out_free_inet:
1146 sock_diag_unregister(&inet_diag_handler);
1147out_free_nl:
1148 kfree(inet_diag_table);
1149 goto out;
1150}
1151
1152static void __exit inet_diag_exit(void)
1153{
1154 sock_diag_unregister(&inet6_diag_handler);
1155 sock_diag_unregister(&inet_diag_handler);
1156 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1157 kfree(inet_diag_table);
1158}
1159
1160module_init(inet_diag_init);
1161module_exit(inet_diag_exit);
1162MODULE_LICENSE("GPL");
1163MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1164MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);