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inet_diag: validate byte code to prevent oops in inet_diag_bc_run()
[deliverable/linux.git] / net / ipv4 / inet_diag.c
1 /*
2 * inet_diag.c Module for monitoring INET transport protocols sockets.
3 *
4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/fcntl.h>
16 #include <linux/random.h>
17 #include <linux/slab.h>
18 #include <linux/cache.h>
19 #include <linux/init.h>
20 #include <linux/time.h>
21
22 #include <net/icmp.h>
23 #include <net/tcp.h>
24 #include <net/ipv6.h>
25 #include <net/inet_common.h>
26 #include <net/inet_connection_sock.h>
27 #include <net/inet_hashtables.h>
28 #include <net/inet_timewait_sock.h>
29 #include <net/inet6_hashtables.h>
30 #include <net/netlink.h>
31
32 #include <linux/inet.h>
33 #include <linux/stddef.h>
34
35 #include <linux/inet_diag.h>
36 #include <linux/sock_diag.h>
37
38 static const struct inet_diag_handler **inet_diag_table;
39
40 struct inet_diag_entry {
41 __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
53 static DEFINE_MUTEX(inet_diag_table_mutex);
54
55 static 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
68 static inline void inet_diag_unlock_handler(
69 const struct inet_diag_handler *handler)
70 {
71 mutex_unlock(&inet_diag_table_mutex);
72 }
73
74 int 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 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 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
117 goto errout;
118
119 #if IS_ENABLED(CONFIG_IPV6)
120 if (r->idiag_family == AF_INET6) {
121 const struct ipv6_pinfo *np = inet6_sk(sk);
122
123 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
124 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
125
126 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
127 if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0)
128 goto errout;
129 }
130 #endif
131
132 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
133 r->idiag_inode = sock_i_ino(sk);
134
135 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
136 struct inet_diag_meminfo minfo = {
137 .idiag_rmem = sk_rmem_alloc_get(sk),
138 .idiag_wmem = sk->sk_wmem_queued,
139 .idiag_fmem = sk->sk_forward_alloc,
140 .idiag_tmem = sk_wmem_alloc_get(sk),
141 };
142
143 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
144 goto errout;
145 }
146
147 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
148 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
149 goto errout;
150
151 if (icsk == NULL) {
152 handler->idiag_get_info(sk, r, NULL);
153 goto out;
154 }
155
156 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
157
158 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
159 r->idiag_timer = 1;
160 r->idiag_retrans = icsk->icsk_retransmits;
161 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
162 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
163 r->idiag_timer = 4;
164 r->idiag_retrans = icsk->icsk_probes_out;
165 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
166 } else if (timer_pending(&sk->sk_timer)) {
167 r->idiag_timer = 2;
168 r->idiag_retrans = icsk->icsk_probes_out;
169 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
170 } else {
171 r->idiag_timer = 0;
172 r->idiag_expires = 0;
173 }
174 #undef EXPIRES_IN_MS
175
176 if (ext & (1 << (INET_DIAG_INFO - 1))) {
177 attr = nla_reserve(skb, INET_DIAG_INFO,
178 sizeof(struct tcp_info));
179 if (!attr)
180 goto errout;
181
182 info = nla_data(attr);
183 }
184
185 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
186 if (nla_put_string(skb, INET_DIAG_CONG,
187 icsk->icsk_ca_ops->name) < 0)
188 goto errout;
189
190 handler->idiag_get_info(sk, r, info);
191
192 if (sk->sk_state < TCP_TIME_WAIT &&
193 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
194 icsk->icsk_ca_ops->get_info(sk, ext, skb);
195
196 out:
197 return nlmsg_end(skb, nlh);
198
199 errout:
200 nlmsg_cancel(skb, nlh);
201 return -EMSGSIZE;
202 }
203 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
204
205 static int inet_csk_diag_fill(struct sock *sk,
206 struct sk_buff *skb, struct inet_diag_req_v2 *req,
207 struct user_namespace *user_ns,
208 u32 portid, u32 seq, u16 nlmsg_flags,
209 const struct nlmsghdr *unlh)
210 {
211 return inet_sk_diag_fill(sk, inet_csk(sk),
212 skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
213 }
214
215 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
216 struct sk_buff *skb, struct inet_diag_req_v2 *req,
217 u32 portid, u32 seq, u16 nlmsg_flags,
218 const struct nlmsghdr *unlh)
219 {
220 long tmo;
221 struct inet_diag_msg *r;
222 struct nlmsghdr *nlh;
223
224 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
225 nlmsg_flags);
226 if (!nlh)
227 return -EMSGSIZE;
228
229 r = nlmsg_data(nlh);
230 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
231
232 tmo = tw->tw_ttd - jiffies;
233 if (tmo < 0)
234 tmo = 0;
235
236 r->idiag_family = tw->tw_family;
237 r->idiag_retrans = 0;
238 r->id.idiag_if = tw->tw_bound_dev_if;
239 sock_diag_save_cookie(tw, r->id.idiag_cookie);
240 r->id.idiag_sport = tw->tw_sport;
241 r->id.idiag_dport = tw->tw_dport;
242 r->id.idiag_src[0] = tw->tw_rcv_saddr;
243 r->id.idiag_dst[0] = tw->tw_daddr;
244 r->idiag_state = tw->tw_substate;
245 r->idiag_timer = 3;
246 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
247 r->idiag_rqueue = 0;
248 r->idiag_wqueue = 0;
249 r->idiag_uid = 0;
250 r->idiag_inode = 0;
251 #if IS_ENABLED(CONFIG_IPV6)
252 if (tw->tw_family == AF_INET6) {
253 const struct inet6_timewait_sock *tw6 =
254 inet6_twsk((struct sock *)tw);
255
256 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
257 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
258 }
259 #endif
260
261 return nlmsg_end(skb, nlh);
262 }
263
264 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
265 struct inet_diag_req_v2 *r,
266 struct user_namespace *user_ns,
267 u32 portid, u32 seq, u16 nlmsg_flags,
268 const struct nlmsghdr *unlh)
269 {
270 if (sk->sk_state == TCP_TIME_WAIT)
271 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
272 skb, r, portid, seq, nlmsg_flags,
273 unlh);
274 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, nlmsg_flags, unlh);
275 }
276
277 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
278 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
279 {
280 int err;
281 struct sock *sk;
282 struct sk_buff *rep;
283 struct net *net = sock_net(in_skb->sk);
284
285 err = -EINVAL;
286 if (req->sdiag_family == AF_INET) {
287 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
288 req->id.idiag_dport, req->id.idiag_src[0],
289 req->id.idiag_sport, req->id.idiag_if);
290 }
291 #if IS_ENABLED(CONFIG_IPV6)
292 else if (req->sdiag_family == AF_INET6) {
293 sk = inet6_lookup(net, hashinfo,
294 (struct in6_addr *)req->id.idiag_dst,
295 req->id.idiag_dport,
296 (struct in6_addr *)req->id.idiag_src,
297 req->id.idiag_sport,
298 req->id.idiag_if);
299 }
300 #endif
301 else {
302 goto out_nosk;
303 }
304
305 err = -ENOENT;
306 if (sk == NULL)
307 goto out_nosk;
308
309 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
310 if (err)
311 goto out;
312
313 rep = nlmsg_new(sizeof(struct inet_diag_msg) +
314 sizeof(struct inet_diag_meminfo) +
315 sizeof(struct tcp_info) + 64, GFP_KERNEL);
316 if (!rep) {
317 err = -ENOMEM;
318 goto out;
319 }
320
321 err = sk_diag_fill(sk, rep, req,
322 sk_user_ns(NETLINK_CB(in_skb).ssk),
323 NETLINK_CB(in_skb).portid,
324 nlh->nlmsg_seq, 0, nlh);
325 if (err < 0) {
326 WARN_ON(err == -EMSGSIZE);
327 nlmsg_free(rep);
328 goto out;
329 }
330 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
331 MSG_DONTWAIT);
332 if (err > 0)
333 err = 0;
334
335 out:
336 if (sk) {
337 if (sk->sk_state == TCP_TIME_WAIT)
338 inet_twsk_put((struct inet_timewait_sock *)sk);
339 else
340 sock_put(sk);
341 }
342 out_nosk:
343 return err;
344 }
345 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
346
347 static int inet_diag_get_exact(struct sk_buff *in_skb,
348 const struct nlmsghdr *nlh,
349 struct inet_diag_req_v2 *req)
350 {
351 const struct inet_diag_handler *handler;
352 int err;
353
354 handler = inet_diag_lock_handler(req->sdiag_protocol);
355 if (IS_ERR(handler))
356 err = PTR_ERR(handler);
357 else
358 err = handler->dump_one(in_skb, nlh, req);
359 inet_diag_unlock_handler(handler);
360
361 return err;
362 }
363
364 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
365 {
366 int words = bits >> 5;
367
368 bits &= 0x1f;
369
370 if (words) {
371 if (memcmp(a1, a2, words << 2))
372 return 0;
373 }
374 if (bits) {
375 __be32 w1, w2;
376 __be32 mask;
377
378 w1 = a1[words];
379 w2 = a2[words];
380
381 mask = htonl((0xffffffff) << (32 - bits));
382
383 if ((w1 ^ w2) & mask)
384 return 0;
385 }
386
387 return 1;
388 }
389
390
391 static int inet_diag_bc_run(const struct nlattr *_bc,
392 const struct inet_diag_entry *entry)
393 {
394 const void *bc = nla_data(_bc);
395 int len = nla_len(_bc);
396
397 while (len > 0) {
398 int yes = 1;
399 const struct inet_diag_bc_op *op = bc;
400
401 switch (op->code) {
402 case INET_DIAG_BC_NOP:
403 break;
404 case INET_DIAG_BC_JMP:
405 yes = 0;
406 break;
407 case INET_DIAG_BC_S_GE:
408 yes = entry->sport >= op[1].no;
409 break;
410 case INET_DIAG_BC_S_LE:
411 yes = entry->sport <= op[1].no;
412 break;
413 case INET_DIAG_BC_D_GE:
414 yes = entry->dport >= op[1].no;
415 break;
416 case INET_DIAG_BC_D_LE:
417 yes = entry->dport <= op[1].no;
418 break;
419 case INET_DIAG_BC_AUTO:
420 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
421 break;
422 case INET_DIAG_BC_S_COND:
423 case INET_DIAG_BC_D_COND: {
424 struct inet_diag_hostcond *cond;
425 __be32 *addr;
426
427 cond = (struct inet_diag_hostcond *)(op + 1);
428 if (cond->port != -1 &&
429 cond->port != (op->code == INET_DIAG_BC_S_COND ?
430 entry->sport : entry->dport)) {
431 yes = 0;
432 break;
433 }
434
435 if (cond->prefix_len == 0)
436 break;
437
438 if (op->code == INET_DIAG_BC_S_COND)
439 addr = entry->saddr;
440 else
441 addr = entry->daddr;
442
443 if (bitstring_match(addr, cond->addr,
444 cond->prefix_len))
445 break;
446 if (entry->family == AF_INET6 &&
447 cond->family == AF_INET) {
448 if (addr[0] == 0 && addr[1] == 0 &&
449 addr[2] == htonl(0xffff) &&
450 bitstring_match(addr + 3, cond->addr,
451 cond->prefix_len))
452 break;
453 }
454 yes = 0;
455 break;
456 }
457 }
458
459 if (yes) {
460 len -= op->yes;
461 bc += op->yes;
462 } else {
463 len -= op->no;
464 bc += op->no;
465 }
466 }
467 return len == 0;
468 }
469
470 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
471 {
472 struct inet_diag_entry entry;
473 struct inet_sock *inet = inet_sk(sk);
474
475 if (bc == NULL)
476 return 1;
477
478 entry.family = sk->sk_family;
479 #if IS_ENABLED(CONFIG_IPV6)
480 if (entry.family == AF_INET6) {
481 struct ipv6_pinfo *np = inet6_sk(sk);
482
483 entry.saddr = np->rcv_saddr.s6_addr32;
484 entry.daddr = np->daddr.s6_addr32;
485 } else
486 #endif
487 {
488 entry.saddr = &inet->inet_rcv_saddr;
489 entry.daddr = &inet->inet_daddr;
490 }
491 entry.sport = inet->inet_num;
492 entry.dport = ntohs(inet->inet_dport);
493 entry.userlocks = sk->sk_userlocks;
494
495 return inet_diag_bc_run(bc, &entry);
496 }
497 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
498
499 static int valid_cc(const void *bc, int len, int cc)
500 {
501 while (len >= 0) {
502 const struct inet_diag_bc_op *op = bc;
503
504 if (cc > len)
505 return 0;
506 if (cc == len)
507 return 1;
508 if (op->yes < 4 || op->yes & 3)
509 return 0;
510 len -= op->yes;
511 bc += op->yes;
512 }
513 return 0;
514 }
515
516 /* Validate an inet_diag_hostcond. */
517 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
518 int *min_len)
519 {
520 int addr_len;
521 struct inet_diag_hostcond *cond;
522
523 /* Check hostcond space. */
524 *min_len += sizeof(struct inet_diag_hostcond);
525 if (len < *min_len)
526 return false;
527 cond = (struct inet_diag_hostcond *)(op + 1);
528
529 /* Check address family and address length. */
530 switch (cond->family) {
531 case AF_UNSPEC:
532 addr_len = 0;
533 break;
534 case AF_INET:
535 addr_len = sizeof(struct in_addr);
536 break;
537 case AF_INET6:
538 addr_len = sizeof(struct in6_addr);
539 break;
540 default:
541 return false;
542 }
543 *min_len += addr_len;
544 if (len < *min_len)
545 return false;
546
547 /* Check prefix length (in bits) vs address length (in bytes). */
548 if (cond->prefix_len > 8 * addr_len)
549 return false;
550
551 return true;
552 }
553
554 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
555 {
556 const void *bc = bytecode;
557 int len = bytecode_len;
558
559 while (len > 0) {
560 const struct inet_diag_bc_op *op = bc;
561 int min_len = sizeof(struct inet_diag_bc_op);
562
563 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
564 switch (op->code) {
565 case INET_DIAG_BC_S_COND:
566 case INET_DIAG_BC_D_COND:
567 if (!valid_hostcond(bc, len, &min_len))
568 return -EINVAL;
569 /* fall through */
570 case INET_DIAG_BC_AUTO:
571 case INET_DIAG_BC_S_GE:
572 case INET_DIAG_BC_S_LE:
573 case INET_DIAG_BC_D_GE:
574 case INET_DIAG_BC_D_LE:
575 case INET_DIAG_BC_JMP:
576 if (op->no < min_len || op->no > len + 4 || op->no & 3)
577 return -EINVAL;
578 if (op->no < len &&
579 !valid_cc(bytecode, bytecode_len, len - op->no))
580 return -EINVAL;
581 break;
582 case INET_DIAG_BC_NOP:
583 break;
584 default:
585 return -EINVAL;
586 }
587 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
588 return -EINVAL;
589 bc += op->yes;
590 len -= op->yes;
591 }
592 return len == 0 ? 0 : -EINVAL;
593 }
594
595 static int inet_csk_diag_dump(struct sock *sk,
596 struct sk_buff *skb,
597 struct netlink_callback *cb,
598 struct inet_diag_req_v2 *r,
599 const struct nlattr *bc)
600 {
601 if (!inet_diag_bc_sk(bc, sk))
602 return 0;
603
604 return inet_csk_diag_fill(sk, skb, r,
605 sk_user_ns(NETLINK_CB(cb->skb).ssk),
606 NETLINK_CB(cb->skb).portid,
607 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
608 }
609
610 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
611 struct sk_buff *skb,
612 struct netlink_callback *cb,
613 struct inet_diag_req_v2 *r,
614 const struct nlattr *bc)
615 {
616 if (bc != NULL) {
617 struct inet_diag_entry entry;
618
619 entry.family = tw->tw_family;
620 #if IS_ENABLED(CONFIG_IPV6)
621 if (tw->tw_family == AF_INET6) {
622 struct inet6_timewait_sock *tw6 =
623 inet6_twsk((struct sock *)tw);
624 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
625 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
626 } else
627 #endif
628 {
629 entry.saddr = &tw->tw_rcv_saddr;
630 entry.daddr = &tw->tw_daddr;
631 }
632 entry.sport = tw->tw_num;
633 entry.dport = ntohs(tw->tw_dport);
634 entry.userlocks = 0;
635
636 if (!inet_diag_bc_run(bc, &entry))
637 return 0;
638 }
639
640 return inet_twsk_diag_fill(tw, skb, r,
641 NETLINK_CB(cb->skb).portid,
642 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
643 }
644
645 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
646 * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
647 */
648 static inline void inet_diag_req_addrs(const struct sock *sk,
649 const struct request_sock *req,
650 struct inet_diag_entry *entry)
651 {
652 struct inet_request_sock *ireq = inet_rsk(req);
653
654 #if IS_ENABLED(CONFIG_IPV6)
655 if (sk->sk_family == AF_INET6) {
656 if (req->rsk_ops->family == AF_INET6) {
657 entry->saddr = inet6_rsk(req)->loc_addr.s6_addr32;
658 entry->daddr = inet6_rsk(req)->rmt_addr.s6_addr32;
659 } else if (req->rsk_ops->family == AF_INET) {
660 ipv6_addr_set_v4mapped(ireq->loc_addr,
661 &entry->saddr_storage);
662 ipv6_addr_set_v4mapped(ireq->rmt_addr,
663 &entry->daddr_storage);
664 entry->saddr = entry->saddr_storage.s6_addr32;
665 entry->daddr = entry->daddr_storage.s6_addr32;
666 }
667 } else
668 #endif
669 {
670 entry->saddr = &ireq->loc_addr;
671 entry->daddr = &ireq->rmt_addr;
672 }
673 }
674
675 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
676 struct request_sock *req,
677 struct user_namespace *user_ns,
678 u32 portid, u32 seq,
679 const struct nlmsghdr *unlh)
680 {
681 const struct inet_request_sock *ireq = inet_rsk(req);
682 struct inet_sock *inet = inet_sk(sk);
683 struct inet_diag_msg *r;
684 struct nlmsghdr *nlh;
685 long tmo;
686
687 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
688 NLM_F_MULTI);
689 if (!nlh)
690 return -EMSGSIZE;
691
692 r = nlmsg_data(nlh);
693 r->idiag_family = sk->sk_family;
694 r->idiag_state = TCP_SYN_RECV;
695 r->idiag_timer = 1;
696 r->idiag_retrans = req->retrans;
697
698 r->id.idiag_if = sk->sk_bound_dev_if;
699 sock_diag_save_cookie(req, r->id.idiag_cookie);
700
701 tmo = req->expires - jiffies;
702 if (tmo < 0)
703 tmo = 0;
704
705 r->id.idiag_sport = inet->inet_sport;
706 r->id.idiag_dport = ireq->rmt_port;
707 r->id.idiag_src[0] = ireq->loc_addr;
708 r->id.idiag_dst[0] = ireq->rmt_addr;
709 r->idiag_expires = jiffies_to_msecs(tmo);
710 r->idiag_rqueue = 0;
711 r->idiag_wqueue = 0;
712 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
713 r->idiag_inode = 0;
714 #if IS_ENABLED(CONFIG_IPV6)
715 if (r->idiag_family == AF_INET6) {
716 struct inet_diag_entry entry;
717 inet_diag_req_addrs(sk, req, &entry);
718 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
719 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
720 }
721 #endif
722
723 return nlmsg_end(skb, nlh);
724 }
725
726 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
727 struct netlink_callback *cb,
728 struct inet_diag_req_v2 *r,
729 const struct nlattr *bc)
730 {
731 struct inet_diag_entry entry;
732 struct inet_connection_sock *icsk = inet_csk(sk);
733 struct listen_sock *lopt;
734 struct inet_sock *inet = inet_sk(sk);
735 int j, s_j;
736 int reqnum, s_reqnum;
737 int err = 0;
738
739 s_j = cb->args[3];
740 s_reqnum = cb->args[4];
741
742 if (s_j > 0)
743 s_j--;
744
745 entry.family = sk->sk_family;
746
747 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
748
749 lopt = icsk->icsk_accept_queue.listen_opt;
750 if (!lopt || !lopt->qlen)
751 goto out;
752
753 if (bc != NULL) {
754 entry.sport = inet->inet_num;
755 entry.userlocks = sk->sk_userlocks;
756 }
757
758 for (j = s_j; j < lopt->nr_table_entries; j++) {
759 struct request_sock *req, *head = lopt->syn_table[j];
760
761 reqnum = 0;
762 for (req = head; req; reqnum++, req = req->dl_next) {
763 struct inet_request_sock *ireq = inet_rsk(req);
764
765 if (reqnum < s_reqnum)
766 continue;
767 if (r->id.idiag_dport != ireq->rmt_port &&
768 r->id.idiag_dport)
769 continue;
770
771 if (bc) {
772 inet_diag_req_addrs(sk, req, &entry);
773 entry.dport = ntohs(ireq->rmt_port);
774
775 if (!inet_diag_bc_run(bc, &entry))
776 continue;
777 }
778
779 err = inet_diag_fill_req(skb, sk, req,
780 sk_user_ns(NETLINK_CB(cb->skb).ssk),
781 NETLINK_CB(cb->skb).portid,
782 cb->nlh->nlmsg_seq, cb->nlh);
783 if (err < 0) {
784 cb->args[3] = j + 1;
785 cb->args[4] = reqnum;
786 goto out;
787 }
788 }
789
790 s_reqnum = 0;
791 }
792
793 out:
794 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
795
796 return err;
797 }
798
799 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
800 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
801 {
802 int i, num;
803 int s_i, s_num;
804 struct net *net = sock_net(skb->sk);
805
806 s_i = cb->args[1];
807 s_num = num = cb->args[2];
808
809 if (cb->args[0] == 0) {
810 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
811 goto skip_listen_ht;
812
813 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
814 struct sock *sk;
815 struct hlist_nulls_node *node;
816 struct inet_listen_hashbucket *ilb;
817
818 num = 0;
819 ilb = &hashinfo->listening_hash[i];
820 spin_lock_bh(&ilb->lock);
821 sk_nulls_for_each(sk, node, &ilb->head) {
822 struct inet_sock *inet = inet_sk(sk);
823
824 if (!net_eq(sock_net(sk), net))
825 continue;
826
827 if (num < s_num) {
828 num++;
829 continue;
830 }
831
832 if (r->sdiag_family != AF_UNSPEC &&
833 sk->sk_family != r->sdiag_family)
834 goto next_listen;
835
836 if (r->id.idiag_sport != inet->inet_sport &&
837 r->id.idiag_sport)
838 goto next_listen;
839
840 if (!(r->idiag_states & TCPF_LISTEN) ||
841 r->id.idiag_dport ||
842 cb->args[3] > 0)
843 goto syn_recv;
844
845 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
846 spin_unlock_bh(&ilb->lock);
847 goto done;
848 }
849
850 syn_recv:
851 if (!(r->idiag_states & TCPF_SYN_RECV))
852 goto next_listen;
853
854 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
855 spin_unlock_bh(&ilb->lock);
856 goto done;
857 }
858
859 next_listen:
860 cb->args[3] = 0;
861 cb->args[4] = 0;
862 ++num;
863 }
864 spin_unlock_bh(&ilb->lock);
865
866 s_num = 0;
867 cb->args[3] = 0;
868 cb->args[4] = 0;
869 }
870 skip_listen_ht:
871 cb->args[0] = 1;
872 s_i = num = s_num = 0;
873 }
874
875 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
876 goto out;
877
878 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
879 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
880 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
881 struct sock *sk;
882 struct hlist_nulls_node *node;
883
884 num = 0;
885
886 if (hlist_nulls_empty(&head->chain) &&
887 hlist_nulls_empty(&head->twchain))
888 continue;
889
890 if (i > s_i)
891 s_num = 0;
892
893 spin_lock_bh(lock);
894 sk_nulls_for_each(sk, node, &head->chain) {
895 struct inet_sock *inet = inet_sk(sk);
896
897 if (!net_eq(sock_net(sk), net))
898 continue;
899 if (num < s_num)
900 goto next_normal;
901 if (!(r->idiag_states & (1 << sk->sk_state)))
902 goto next_normal;
903 if (r->sdiag_family != AF_UNSPEC &&
904 sk->sk_family != r->sdiag_family)
905 goto next_normal;
906 if (r->id.idiag_sport != inet->inet_sport &&
907 r->id.idiag_sport)
908 goto next_normal;
909 if (r->id.idiag_dport != inet->inet_dport &&
910 r->id.idiag_dport)
911 goto next_normal;
912 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
913 spin_unlock_bh(lock);
914 goto done;
915 }
916 next_normal:
917 ++num;
918 }
919
920 if (r->idiag_states & TCPF_TIME_WAIT) {
921 struct inet_timewait_sock *tw;
922
923 inet_twsk_for_each(tw, node,
924 &head->twchain) {
925 if (!net_eq(twsk_net(tw), net))
926 continue;
927
928 if (num < s_num)
929 goto next_dying;
930 if (r->sdiag_family != AF_UNSPEC &&
931 tw->tw_family != r->sdiag_family)
932 goto next_dying;
933 if (r->id.idiag_sport != tw->tw_sport &&
934 r->id.idiag_sport)
935 goto next_dying;
936 if (r->id.idiag_dport != tw->tw_dport &&
937 r->id.idiag_dport)
938 goto next_dying;
939 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
940 spin_unlock_bh(lock);
941 goto done;
942 }
943 next_dying:
944 ++num;
945 }
946 }
947 spin_unlock_bh(lock);
948 }
949
950 done:
951 cb->args[1] = i;
952 cb->args[2] = num;
953 out:
954 ;
955 }
956 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
957
958 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
959 struct inet_diag_req_v2 *r, struct nlattr *bc)
960 {
961 const struct inet_diag_handler *handler;
962 int err = 0;
963
964 handler = inet_diag_lock_handler(r->sdiag_protocol);
965 if (!IS_ERR(handler))
966 handler->dump(skb, cb, r, bc);
967 else
968 err = PTR_ERR(handler);
969 inet_diag_unlock_handler(handler);
970
971 return err ? : skb->len;
972 }
973
974 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
975 {
976 struct nlattr *bc = NULL;
977 int hdrlen = sizeof(struct inet_diag_req_v2);
978
979 if (nlmsg_attrlen(cb->nlh, hdrlen))
980 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
981
982 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
983 }
984
985 static inline int inet_diag_type2proto(int type)
986 {
987 switch (type) {
988 case TCPDIAG_GETSOCK:
989 return IPPROTO_TCP;
990 case DCCPDIAG_GETSOCK:
991 return IPPROTO_DCCP;
992 default:
993 return 0;
994 }
995 }
996
997 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
998 {
999 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1000 struct inet_diag_req_v2 req;
1001 struct nlattr *bc = NULL;
1002 int hdrlen = sizeof(struct inet_diag_req);
1003
1004 req.sdiag_family = AF_UNSPEC; /* compatibility */
1005 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1006 req.idiag_ext = rc->idiag_ext;
1007 req.idiag_states = rc->idiag_states;
1008 req.id = rc->id;
1009
1010 if (nlmsg_attrlen(cb->nlh, hdrlen))
1011 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1012
1013 return __inet_diag_dump(skb, cb, &req, bc);
1014 }
1015
1016 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1017 const struct nlmsghdr *nlh)
1018 {
1019 struct inet_diag_req *rc = nlmsg_data(nlh);
1020 struct inet_diag_req_v2 req;
1021
1022 req.sdiag_family = rc->idiag_family;
1023 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1024 req.idiag_ext = rc->idiag_ext;
1025 req.idiag_states = rc->idiag_states;
1026 req.id = rc->id;
1027
1028 return inet_diag_get_exact(in_skb, nlh, &req);
1029 }
1030
1031 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1032 {
1033 int hdrlen = sizeof(struct inet_diag_req);
1034 struct net *net = sock_net(skb->sk);
1035
1036 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1037 nlmsg_len(nlh) < hdrlen)
1038 return -EINVAL;
1039
1040 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1041 if (nlmsg_attrlen(nlh, hdrlen)) {
1042 struct nlattr *attr;
1043
1044 attr = nlmsg_find_attr(nlh, hdrlen,
1045 INET_DIAG_REQ_BYTECODE);
1046 if (attr == NULL ||
1047 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1048 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1049 return -EINVAL;
1050 }
1051 {
1052 struct netlink_dump_control c = {
1053 .dump = inet_diag_dump_compat,
1054 };
1055 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1056 }
1057 }
1058
1059 return inet_diag_get_exact_compat(skb, nlh);
1060 }
1061
1062 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1063 {
1064 int hdrlen = sizeof(struct inet_diag_req_v2);
1065 struct net *net = sock_net(skb->sk);
1066
1067 if (nlmsg_len(h) < hdrlen)
1068 return -EINVAL;
1069
1070 if (h->nlmsg_flags & NLM_F_DUMP) {
1071 if (nlmsg_attrlen(h, hdrlen)) {
1072 struct nlattr *attr;
1073 attr = nlmsg_find_attr(h, hdrlen,
1074 INET_DIAG_REQ_BYTECODE);
1075 if (attr == NULL ||
1076 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1077 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1078 return -EINVAL;
1079 }
1080 {
1081 struct netlink_dump_control c = {
1082 .dump = inet_diag_dump,
1083 };
1084 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1085 }
1086 }
1087
1088 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1089 }
1090
1091 static const struct sock_diag_handler inet_diag_handler = {
1092 .family = AF_INET,
1093 .dump = inet_diag_handler_dump,
1094 };
1095
1096 static const struct sock_diag_handler inet6_diag_handler = {
1097 .family = AF_INET6,
1098 .dump = inet_diag_handler_dump,
1099 };
1100
1101 int inet_diag_register(const struct inet_diag_handler *h)
1102 {
1103 const __u16 type = h->idiag_type;
1104 int err = -EINVAL;
1105
1106 if (type >= IPPROTO_MAX)
1107 goto out;
1108
1109 mutex_lock(&inet_diag_table_mutex);
1110 err = -EEXIST;
1111 if (inet_diag_table[type] == NULL) {
1112 inet_diag_table[type] = h;
1113 err = 0;
1114 }
1115 mutex_unlock(&inet_diag_table_mutex);
1116 out:
1117 return err;
1118 }
1119 EXPORT_SYMBOL_GPL(inet_diag_register);
1120
1121 void inet_diag_unregister(const struct inet_diag_handler *h)
1122 {
1123 const __u16 type = h->idiag_type;
1124
1125 if (type >= IPPROTO_MAX)
1126 return;
1127
1128 mutex_lock(&inet_diag_table_mutex);
1129 inet_diag_table[type] = NULL;
1130 mutex_unlock(&inet_diag_table_mutex);
1131 }
1132 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1133
1134 static int __init inet_diag_init(void)
1135 {
1136 const int inet_diag_table_size = (IPPROTO_MAX *
1137 sizeof(struct inet_diag_handler *));
1138 int err = -ENOMEM;
1139
1140 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1141 if (!inet_diag_table)
1142 goto out;
1143
1144 err = sock_diag_register(&inet_diag_handler);
1145 if (err)
1146 goto out_free_nl;
1147
1148 err = sock_diag_register(&inet6_diag_handler);
1149 if (err)
1150 goto out_free_inet;
1151
1152 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1153 out:
1154 return err;
1155
1156 out_free_inet:
1157 sock_diag_unregister(&inet_diag_handler);
1158 out_free_nl:
1159 kfree(inet_diag_table);
1160 goto out;
1161 }
1162
1163 static void __exit inet_diag_exit(void)
1164 {
1165 sock_diag_unregister(&inet6_diag_handler);
1166 sock_diag_unregister(&inet_diag_handler);
1167 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1168 kfree(inet_diag_table);
1169 }
1170
1171 module_init(inet_diag_init);
1172 module_exit(inet_diag_exit);
1173 MODULE_LICENSE("GPL");
1174 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1175 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
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