projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
ipv6: make lookups simpler and faster
[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 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
113 goto errout;
114
115 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
116 * hence this needs to be included regardless of socket family.
117 */
118 if (ext & (1 << (INET_DIAG_TOS - 1)))
119 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
120 goto errout;
121
122 #if IS_ENABLED(CONFIG_IPV6)
123 if (r->idiag_family == AF_INET6) {
124
125 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
126 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
127
128 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
129 if (nla_put_u8(skb, INET_DIAG_TCLASS,
130 inet6_sk(sk)->tclass) < 0)
131 goto errout;
132 }
133 #endif
134
135 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
136 r->idiag_inode = sock_i_ino(sk);
137
138 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
139 struct inet_diag_meminfo minfo = {
140 .idiag_rmem = sk_rmem_alloc_get(sk),
141 .idiag_wmem = sk->sk_wmem_queued,
142 .idiag_fmem = sk->sk_forward_alloc,
143 .idiag_tmem = sk_wmem_alloc_get(sk),
144 };
145
146 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
147 goto errout;
148 }
149
150 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
151 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
152 goto errout;
153
154 if (icsk == NULL) {
155 handler->idiag_get_info(sk, r, NULL);
156 goto out;
157 }
158
159 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
160
161 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
162 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
163 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
164 r->idiag_timer = 1;
165 r->idiag_retrans = icsk->icsk_retransmits;
166 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
167 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
168 r->idiag_timer = 4;
169 r->idiag_retrans = icsk->icsk_probes_out;
170 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
171 } else if (timer_pending(&sk->sk_timer)) {
172 r->idiag_timer = 2;
173 r->idiag_retrans = icsk->icsk_probes_out;
174 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
175 } else {
176 r->idiag_timer = 0;
177 r->idiag_expires = 0;
178 }
179 #undef EXPIRES_IN_MS
180
181 if (ext & (1 << (INET_DIAG_INFO - 1))) {
182 attr = nla_reserve(skb, INET_DIAG_INFO,
183 sizeof(struct tcp_info));
184 if (!attr)
185 goto errout;
186
187 info = nla_data(attr);
188 }
189
190 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
191 if (nla_put_string(skb, INET_DIAG_CONG,
192 icsk->icsk_ca_ops->name) < 0)
193 goto errout;
194
195 handler->idiag_get_info(sk, r, info);
196
197 if (sk->sk_state < TCP_TIME_WAIT &&
198 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
199 icsk->icsk_ca_ops->get_info(sk, ext, skb);
200
201 out:
202 return nlmsg_end(skb, nlh);
203
204 errout:
205 nlmsg_cancel(skb, nlh);
206 return -EMSGSIZE;
207 }
208 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
209
210 static int inet_csk_diag_fill(struct sock *sk,
211 struct sk_buff *skb, struct inet_diag_req_v2 *req,
212 struct user_namespace *user_ns,
213 u32 portid, u32 seq, u16 nlmsg_flags,
214 const struct nlmsghdr *unlh)
215 {
216 return inet_sk_diag_fill(sk, inet_csk(sk),
217 skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
218 }
219
220 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
221 struct sk_buff *skb, struct inet_diag_req_v2 *req,
222 u32 portid, u32 seq, u16 nlmsg_flags,
223 const struct nlmsghdr *unlh)
224 {
225 s32 tmo;
226 struct inet_diag_msg *r;
227 struct nlmsghdr *nlh;
228
229 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
230 nlmsg_flags);
231 if (!nlh)
232 return -EMSGSIZE;
233
234 r = nlmsg_data(nlh);
235 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
236
237 tmo = tw->tw_ttd - inet_tw_time_stamp();
238 if (tmo < 0)
239 tmo = 0;
240
241 r->idiag_family = tw->tw_family;
242 r->idiag_retrans = 0;
243 r->id.idiag_if = tw->tw_bound_dev_if;
244 sock_diag_save_cookie(tw, r->id.idiag_cookie);
245 r->id.idiag_sport = tw->tw_sport;
246 r->id.idiag_dport = tw->tw_dport;
247 r->id.idiag_src[0] = tw->tw_rcv_saddr;
248 r->id.idiag_dst[0] = tw->tw_daddr;
249 r->idiag_state = tw->tw_substate;
250 r->idiag_timer = 3;
251 r->idiag_expires = jiffies_to_msecs(tmo);
252 r->idiag_rqueue = 0;
253 r->idiag_wqueue = 0;
254 r->idiag_uid = 0;
255 r->idiag_inode = 0;
256 #if IS_ENABLED(CONFIG_IPV6)
257 if (tw->tw_family == AF_INET6) {
258 *(struct in6_addr *)r->id.idiag_src = tw->tw_v6_rcv_saddr;
259 *(struct in6_addr *)r->id.idiag_dst = tw->tw_v6_daddr;
260 }
261 #endif
262
263 return nlmsg_end(skb, nlh);
264 }
265
266 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
267 struct inet_diag_req_v2 *r,
268 struct user_namespace *user_ns,
269 u32 portid, u32 seq, u16 nlmsg_flags,
270 const struct nlmsghdr *unlh)
271 {
272 if (sk->sk_state == TCP_TIME_WAIT)
273 return inet_twsk_diag_fill(inet_twsk(sk), skb, r, portid, seq,
274 nlmsg_flags, unlh);
275
276 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
277 nlmsg_flags, unlh);
278 }
279
280 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
281 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
282 {
283 int err;
284 struct sock *sk;
285 struct sk_buff *rep;
286 struct net *net = sock_net(in_skb->sk);
287
288 err = -EINVAL;
289 if (req->sdiag_family == AF_INET) {
290 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
291 req->id.idiag_dport, req->id.idiag_src[0],
292 req->id.idiag_sport, req->id.idiag_if);
293 }
294 #if IS_ENABLED(CONFIG_IPV6)
295 else if (req->sdiag_family == AF_INET6) {
296 sk = inet6_lookup(net, hashinfo,
297 (struct in6_addr *)req->id.idiag_dst,
298 req->id.idiag_dport,
299 (struct in6_addr *)req->id.idiag_src,
300 req->id.idiag_sport,
301 req->id.idiag_if);
302 }
303 #endif
304 else {
305 goto out_nosk;
306 }
307
308 err = -ENOENT;
309 if (sk == NULL)
310 goto out_nosk;
311
312 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
313 if (err)
314 goto out;
315
316 rep = nlmsg_new(sizeof(struct inet_diag_msg) +
317 sizeof(struct inet_diag_meminfo) +
318 sizeof(struct tcp_info) + 64, GFP_KERNEL);
319 if (!rep) {
320 err = -ENOMEM;
321 goto out;
322 }
323
324 err = sk_diag_fill(sk, rep, req,
325 sk_user_ns(NETLINK_CB(in_skb).sk),
326 NETLINK_CB(in_skb).portid,
327 nlh->nlmsg_seq, 0, nlh);
328 if (err < 0) {
329 WARN_ON(err == -EMSGSIZE);
330 nlmsg_free(rep);
331 goto out;
332 }
333 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
334 MSG_DONTWAIT);
335 if (err > 0)
336 err = 0;
337
338 out:
339 if (sk) {
340 if (sk->sk_state == TCP_TIME_WAIT)
341 inet_twsk_put((struct inet_timewait_sock *)sk);
342 else
343 sock_put(sk);
344 }
345 out_nosk:
346 return err;
347 }
348 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
349
350 static int inet_diag_get_exact(struct sk_buff *in_skb,
351 const struct nlmsghdr *nlh,
352 struct inet_diag_req_v2 *req)
353 {
354 const struct inet_diag_handler *handler;
355 int err;
356
357 handler = inet_diag_lock_handler(req->sdiag_protocol);
358 if (IS_ERR(handler))
359 err = PTR_ERR(handler);
360 else
361 err = handler->dump_one(in_skb, nlh, req);
362 inet_diag_unlock_handler(handler);
363
364 return err;
365 }
366
367 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
368 {
369 int words = bits >> 5;
370
371 bits &= 0x1f;
372
373 if (words) {
374 if (memcmp(a1, a2, words << 2))
375 return 0;
376 }
377 if (bits) {
378 __be32 w1, w2;
379 __be32 mask;
380
381 w1 = a1[words];
382 w2 = a2[words];
383
384 mask = htonl((0xffffffff) << (32 - bits));
385
386 if ((w1 ^ w2) & mask)
387 return 0;
388 }
389
390 return 1;
391 }
392
393
394 static int inet_diag_bc_run(const struct nlattr *_bc,
395 const struct inet_diag_entry *entry)
396 {
397 const void *bc = nla_data(_bc);
398 int len = nla_len(_bc);
399
400 while (len > 0) {
401 int yes = 1;
402 const struct inet_diag_bc_op *op = bc;
403
404 switch (op->code) {
405 case INET_DIAG_BC_NOP:
406 break;
407 case INET_DIAG_BC_JMP:
408 yes = 0;
409 break;
410 case INET_DIAG_BC_S_GE:
411 yes = entry->sport >= op[1].no;
412 break;
413 case INET_DIAG_BC_S_LE:
414 yes = entry->sport <= op[1].no;
415 break;
416 case INET_DIAG_BC_D_GE:
417 yes = entry->dport >= op[1].no;
418 break;
419 case INET_DIAG_BC_D_LE:
420 yes = entry->dport <= op[1].no;
421 break;
422 case INET_DIAG_BC_AUTO:
423 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
424 break;
425 case INET_DIAG_BC_S_COND:
426 case INET_DIAG_BC_D_COND: {
427 struct inet_diag_hostcond *cond;
428 __be32 *addr;
429
430 cond = (struct inet_diag_hostcond *)(op + 1);
431 if (cond->port != -1 &&
432 cond->port != (op->code == INET_DIAG_BC_S_COND ?
433 entry->sport : entry->dport)) {
434 yes = 0;
435 break;
436 }
437
438 if (op->code == INET_DIAG_BC_S_COND)
439 addr = entry->saddr;
440 else
441 addr = entry->daddr;
442
443 if (cond->family != AF_UNSPEC &&
444 cond->family != entry->family) {
445 if (entry->family == AF_INET6 &&
446 cond->family == AF_INET) {
447 if (addr[0] == 0 && addr[1] == 0 &&
448 addr[2] == htonl(0xffff) &&
449 bitstring_match(addr + 3,
450 cond->addr,
451 cond->prefix_len))
452 break;
453 }
454 yes = 0;
455 break;
456 }
457
458 if (cond->prefix_len == 0)
459 break;
460 if (bitstring_match(addr, cond->addr,
461 cond->prefix_len))
462 break;
463 yes = 0;
464 break;
465 }
466 }
467
468 if (yes) {
469 len -= op->yes;
470 bc += op->yes;
471 } else {
472 len -= op->no;
473 bc += op->no;
474 }
475 }
476 return len == 0;
477 }
478
479 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
480 {
481 struct inet_diag_entry entry;
482 struct inet_sock *inet = inet_sk(sk);
483
484 if (bc == NULL)
485 return 1;
486
487 entry.family = sk->sk_family;
488 #if IS_ENABLED(CONFIG_IPV6)
489 if (entry.family == AF_INET6) {
490
491 entry.saddr = sk->sk_v6_rcv_saddr.s6_addr32;
492 entry.daddr = sk->sk_v6_daddr.s6_addr32;
493 } else
494 #endif
495 {
496 entry.saddr = &inet->inet_rcv_saddr;
497 entry.daddr = &inet->inet_daddr;
498 }
499 entry.sport = inet->inet_num;
500 entry.dport = ntohs(inet->inet_dport);
501 entry.userlocks = sk->sk_userlocks;
502
503 return inet_diag_bc_run(bc, &entry);
504 }
505 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
506
507 static int valid_cc(const void *bc, int len, int cc)
508 {
509 while (len >= 0) {
510 const struct inet_diag_bc_op *op = bc;
511
512 if (cc > len)
513 return 0;
514 if (cc == len)
515 return 1;
516 if (op->yes < 4 || op->yes & 3)
517 return 0;
518 len -= op->yes;
519 bc += op->yes;
520 }
521 return 0;
522 }
523
524 /* Validate an inet_diag_hostcond. */
525 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
526 int *min_len)
527 {
528 int addr_len;
529 struct inet_diag_hostcond *cond;
530
531 /* Check hostcond space. */
532 *min_len += sizeof(struct inet_diag_hostcond);
533 if (len < *min_len)
534 return false;
535 cond = (struct inet_diag_hostcond *)(op + 1);
536
537 /* Check address family and address length. */
538 switch (cond->family) {
539 case AF_UNSPEC:
540 addr_len = 0;
541 break;
542 case AF_INET:
543 addr_len = sizeof(struct in_addr);
544 break;
545 case AF_INET6:
546 addr_len = sizeof(struct in6_addr);
547 break;
548 default:
549 return false;
550 }
551 *min_len += addr_len;
552 if (len < *min_len)
553 return false;
554
555 /* Check prefix length (in bits) vs address length (in bytes). */
556 if (cond->prefix_len > 8 * addr_len)
557 return false;
558
559 return true;
560 }
561
562 /* Validate a port comparison operator. */
563 static inline bool valid_port_comparison(const struct inet_diag_bc_op *op,
564 int len, int *min_len)
565 {
566 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
567 *min_len += sizeof(struct inet_diag_bc_op);
568 if (len < *min_len)
569 return false;
570 return true;
571 }
572
573 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
574 {
575 const void *bc = bytecode;
576 int len = bytecode_len;
577
578 while (len > 0) {
579 const struct inet_diag_bc_op *op = bc;
580 int min_len = sizeof(struct inet_diag_bc_op);
581
582 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
583 switch (op->code) {
584 case INET_DIAG_BC_S_COND:
585 case INET_DIAG_BC_D_COND:
586 if (!valid_hostcond(bc, len, &min_len))
587 return -EINVAL;
588 break;
589 case INET_DIAG_BC_S_GE:
590 case INET_DIAG_BC_S_LE:
591 case INET_DIAG_BC_D_GE:
592 case INET_DIAG_BC_D_LE:
593 if (!valid_port_comparison(bc, len, &min_len))
594 return -EINVAL;
595 break;
596 case INET_DIAG_BC_AUTO:
597 case INET_DIAG_BC_JMP:
598 case INET_DIAG_BC_NOP:
599 break;
600 default:
601 return -EINVAL;
602 }
603
604 if (op->code != INET_DIAG_BC_NOP) {
605 if (op->no < min_len || op->no > len + 4 || op->no & 3)
606 return -EINVAL;
607 if (op->no < len &&
608 !valid_cc(bytecode, bytecode_len, len - op->no))
609 return -EINVAL;
610 }
611
612 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
613 return -EINVAL;
614 bc += op->yes;
615 len -= op->yes;
616 }
617 return len == 0 ? 0 : -EINVAL;
618 }
619
620 static int inet_csk_diag_dump(struct sock *sk,
621 struct sk_buff *skb,
622 struct netlink_callback *cb,
623 struct inet_diag_req_v2 *r,
624 const struct nlattr *bc)
625 {
626 if (!inet_diag_bc_sk(bc, sk))
627 return 0;
628
629 return inet_csk_diag_fill(sk, skb, r,
630 sk_user_ns(NETLINK_CB(cb->skb).sk),
631 NETLINK_CB(cb->skb).portid,
632 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
633 }
634
635 static int inet_twsk_diag_dump(struct sock *sk,
636 struct sk_buff *skb,
637 struct netlink_callback *cb,
638 struct inet_diag_req_v2 *r,
639 const struct nlattr *bc)
640 {
641 struct inet_timewait_sock *tw = inet_twsk(sk);
642
643 if (bc != NULL) {
644 struct inet_diag_entry entry;
645
646 entry.family = tw->tw_family;
647 #if IS_ENABLED(CONFIG_IPV6)
648 if (tw->tw_family == AF_INET6) {
649 entry.saddr = tw->tw_v6_rcv_saddr.s6_addr32;
650 entry.daddr = tw->tw_v6_daddr.s6_addr32;
651 } else
652 #endif
653 {
654 entry.saddr = &tw->tw_rcv_saddr;
655 entry.daddr = &tw->tw_daddr;
656 }
657 entry.sport = tw->tw_num;
658 entry.dport = ntohs(tw->tw_dport);
659 entry.userlocks = 0;
660
661 if (!inet_diag_bc_run(bc, &entry))
662 return 0;
663 }
664
665 return inet_twsk_diag_fill(tw, skb, r,
666 NETLINK_CB(cb->skb).portid,
667 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
668 }
669
670 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
671 * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
672 */
673 static inline void inet_diag_req_addrs(const struct sock *sk,
674 const struct request_sock *req,
675 struct inet_diag_entry *entry)
676 {
677 struct inet_request_sock *ireq = inet_rsk(req);
678
679 #if IS_ENABLED(CONFIG_IPV6)
680 if (sk->sk_family == AF_INET6) {
681 if (req->rsk_ops->family == AF_INET6) {
682 entry->saddr = inet6_rsk(req)->loc_addr.s6_addr32;
683 entry->daddr = inet6_rsk(req)->rmt_addr.s6_addr32;
684 } else if (req->rsk_ops->family == AF_INET) {
685 ipv6_addr_set_v4mapped(ireq->loc_addr,
686 &entry->saddr_storage);
687 ipv6_addr_set_v4mapped(ireq->rmt_addr,
688 &entry->daddr_storage);
689 entry->saddr = entry->saddr_storage.s6_addr32;
690 entry->daddr = entry->daddr_storage.s6_addr32;
691 }
692 } else
693 #endif
694 {
695 entry->saddr = &ireq->loc_addr;
696 entry->daddr = &ireq->rmt_addr;
697 }
698 }
699
700 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
701 struct request_sock *req,
702 struct user_namespace *user_ns,
703 u32 portid, u32 seq,
704 const struct nlmsghdr *unlh)
705 {
706 const struct inet_request_sock *ireq = inet_rsk(req);
707 struct inet_sock *inet = inet_sk(sk);
708 struct inet_diag_msg *r;
709 struct nlmsghdr *nlh;
710 long tmo;
711
712 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
713 NLM_F_MULTI);
714 if (!nlh)
715 return -EMSGSIZE;
716
717 r = nlmsg_data(nlh);
718 r->idiag_family = sk->sk_family;
719 r->idiag_state = TCP_SYN_RECV;
720 r->idiag_timer = 1;
721 r->idiag_retrans = req->num_retrans;
722
723 r->id.idiag_if = sk->sk_bound_dev_if;
724 sock_diag_save_cookie(req, r->id.idiag_cookie);
725
726 tmo = req->expires - jiffies;
727 if (tmo < 0)
728 tmo = 0;
729
730 r->id.idiag_sport = inet->inet_sport;
731 r->id.idiag_dport = ireq->rmt_port;
732 r->id.idiag_src[0] = ireq->loc_addr;
733 r->id.idiag_dst[0] = ireq->rmt_addr;
734 r->idiag_expires = jiffies_to_msecs(tmo);
735 r->idiag_rqueue = 0;
736 r->idiag_wqueue = 0;
737 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
738 r->idiag_inode = 0;
739 #if IS_ENABLED(CONFIG_IPV6)
740 if (r->idiag_family == AF_INET6) {
741 struct inet_diag_entry entry;
742 inet_diag_req_addrs(sk, req, &entry);
743 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
744 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
745 }
746 #endif
747
748 return nlmsg_end(skb, nlh);
749 }
750
751 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
752 struct netlink_callback *cb,
753 struct inet_diag_req_v2 *r,
754 const struct nlattr *bc)
755 {
756 struct inet_diag_entry entry;
757 struct inet_connection_sock *icsk = inet_csk(sk);
758 struct listen_sock *lopt;
759 struct inet_sock *inet = inet_sk(sk);
760 int j, s_j;
761 int reqnum, s_reqnum;
762 int err = 0;
763
764 s_j = cb->args[3];
765 s_reqnum = cb->args[4];
766
767 if (s_j > 0)
768 s_j--;
769
770 entry.family = sk->sk_family;
771
772 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
773
774 lopt = icsk->icsk_accept_queue.listen_opt;
775 if (!lopt || !lopt->qlen)
776 goto out;
777
778 if (bc != NULL) {
779 entry.sport = inet->inet_num;
780 entry.userlocks = sk->sk_userlocks;
781 }
782
783 for (j = s_j; j < lopt->nr_table_entries; j++) {
784 struct request_sock *req, *head = lopt->syn_table[j];
785
786 reqnum = 0;
787 for (req = head; req; reqnum++, req = req->dl_next) {
788 struct inet_request_sock *ireq = inet_rsk(req);
789
790 if (reqnum < s_reqnum)
791 continue;
792 if (r->id.idiag_dport != ireq->rmt_port &&
793 r->id.idiag_dport)
794 continue;
795
796 if (bc) {
797 inet_diag_req_addrs(sk, req, &entry);
798 entry.dport = ntohs(ireq->rmt_port);
799
800 if (!inet_diag_bc_run(bc, &entry))
801 continue;
802 }
803
804 err = inet_diag_fill_req(skb, sk, req,
805 sk_user_ns(NETLINK_CB(cb->skb).sk),
806 NETLINK_CB(cb->skb).portid,
807 cb->nlh->nlmsg_seq, cb->nlh);
808 if (err < 0) {
809 cb->args[3] = j + 1;
810 cb->args[4] = reqnum;
811 goto out;
812 }
813 }
814
815 s_reqnum = 0;
816 }
817
818 out:
819 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
820
821 return err;
822 }
823
824 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
825 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
826 {
827 int i, num;
828 int s_i, s_num;
829 struct net *net = sock_net(skb->sk);
830
831 s_i = cb->args[1];
832 s_num = num = cb->args[2];
833
834 if (cb->args[0] == 0) {
835 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
836 goto skip_listen_ht;
837
838 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
839 struct sock *sk;
840 struct hlist_nulls_node *node;
841 struct inet_listen_hashbucket *ilb;
842
843 num = 0;
844 ilb = &hashinfo->listening_hash[i];
845 spin_lock_bh(&ilb->lock);
846 sk_nulls_for_each(sk, node, &ilb->head) {
847 struct inet_sock *inet = inet_sk(sk);
848
849 if (!net_eq(sock_net(sk), net))
850 continue;
851
852 if (num < s_num) {
853 num++;
854 continue;
855 }
856
857 if (r->sdiag_family != AF_UNSPEC &&
858 sk->sk_family != r->sdiag_family)
859 goto next_listen;
860
861 if (r->id.idiag_sport != inet->inet_sport &&
862 r->id.idiag_sport)
863 goto next_listen;
864
865 if (!(r->idiag_states & TCPF_LISTEN) ||
866 r->id.idiag_dport ||
867 cb->args[3] > 0)
868 goto syn_recv;
869
870 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
871 spin_unlock_bh(&ilb->lock);
872 goto done;
873 }
874
875 syn_recv:
876 if (!(r->idiag_states & TCPF_SYN_RECV))
877 goto next_listen;
878
879 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
880 spin_unlock_bh(&ilb->lock);
881 goto done;
882 }
883
884 next_listen:
885 cb->args[3] = 0;
886 cb->args[4] = 0;
887 ++num;
888 }
889 spin_unlock_bh(&ilb->lock);
890
891 s_num = 0;
892 cb->args[3] = 0;
893 cb->args[4] = 0;
894 }
895 skip_listen_ht:
896 cb->args[0] = 1;
897 s_i = num = s_num = 0;
898 }
899
900 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
901 goto out;
902
903 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
904 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
905 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
906 struct sock *sk;
907 struct hlist_nulls_node *node;
908
909 num = 0;
910
911 if (hlist_nulls_empty(&head->chain))
912 continue;
913
914 if (i > s_i)
915 s_num = 0;
916
917 spin_lock_bh(lock);
918 sk_nulls_for_each(sk, node, &head->chain) {
919 int res;
920
921 if (!net_eq(sock_net(sk), net))
922 continue;
923 if (num < s_num)
924 goto next_normal;
925 if (!(r->idiag_states & (1 << sk->sk_state)))
926 goto next_normal;
927 if (r->sdiag_family != AF_UNSPEC &&
928 sk->sk_family != r->sdiag_family)
929 goto next_normal;
930 if (r->id.idiag_sport != htons(sk->sk_num) &&
931 r->id.idiag_sport)
932 goto next_normal;
933 if (r->id.idiag_dport != sk->sk_dport &&
934 r->id.idiag_dport)
935 goto next_normal;
936 if (sk->sk_state == TCP_TIME_WAIT)
937 res = inet_twsk_diag_dump(sk, skb, cb, r, bc);
938 else
939 res = inet_csk_diag_dump(sk, skb, cb, r, bc);
940 if (res < 0) {
941 spin_unlock_bh(lock);
942 goto done;
943 }
944 next_normal:
945 ++num;
946 }
947
948 spin_unlock_bh(lock);
949 }
950
951 done:
952 cb->args[1] = i;
953 cb->args[2] = num;
954 out:
955 ;
956 }
957 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
958
959 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
960 struct inet_diag_req_v2 *r, struct nlattr *bc)
961 {
962 const struct inet_diag_handler *handler;
963 int err = 0;
964
965 handler = inet_diag_lock_handler(r->sdiag_protocol);
966 if (!IS_ERR(handler))
967 handler->dump(skb, cb, r, bc);
968 else
969 err = PTR_ERR(handler);
970 inet_diag_unlock_handler(handler);
971
972 return err ? : skb->len;
973 }
974
975 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
976 {
977 struct nlattr *bc = NULL;
978 int hdrlen = sizeof(struct inet_diag_req_v2);
979
980 if (nlmsg_attrlen(cb->nlh, hdrlen))
981 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
982
983 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
984 }
985
986 static inline int inet_diag_type2proto(int type)
987 {
988 switch (type) {
989 case TCPDIAG_GETSOCK:
990 return IPPROTO_TCP;
991 case DCCPDIAG_GETSOCK:
992 return IPPROTO_DCCP;
993 default:
994 return 0;
995 }
996 }
997
998 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
999 {
1000 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1001 struct inet_diag_req_v2 req;
1002 struct nlattr *bc = NULL;
1003 int hdrlen = sizeof(struct inet_diag_req);
1004
1005 req.sdiag_family = AF_UNSPEC; /* compatibility */
1006 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1007 req.idiag_ext = rc->idiag_ext;
1008 req.idiag_states = rc->idiag_states;
1009 req.id = rc->id;
1010
1011 if (nlmsg_attrlen(cb->nlh, hdrlen))
1012 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1013
1014 return __inet_diag_dump(skb, cb, &req, bc);
1015 }
1016
1017 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1018 const struct nlmsghdr *nlh)
1019 {
1020 struct inet_diag_req *rc = nlmsg_data(nlh);
1021 struct inet_diag_req_v2 req;
1022
1023 req.sdiag_family = rc->idiag_family;
1024 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1025 req.idiag_ext = rc->idiag_ext;
1026 req.idiag_states = rc->idiag_states;
1027 req.id = rc->id;
1028
1029 return inet_diag_get_exact(in_skb, nlh, &req);
1030 }
1031
1032 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1033 {
1034 int hdrlen = sizeof(struct inet_diag_req);
1035 struct net *net = sock_net(skb->sk);
1036
1037 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1038 nlmsg_len(nlh) < hdrlen)
1039 return -EINVAL;
1040
1041 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1042 if (nlmsg_attrlen(nlh, hdrlen)) {
1043 struct nlattr *attr;
1044
1045 attr = nlmsg_find_attr(nlh, hdrlen,
1046 INET_DIAG_REQ_BYTECODE);
1047 if (attr == NULL ||
1048 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1049 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1050 return -EINVAL;
1051 }
1052 {
1053 struct netlink_dump_control c = {
1054 .dump = inet_diag_dump_compat,
1055 };
1056 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1057 }
1058 }
1059
1060 return inet_diag_get_exact_compat(skb, nlh);
1061 }
1062
1063 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1064 {
1065 int hdrlen = sizeof(struct inet_diag_req_v2);
1066 struct net *net = sock_net(skb->sk);
1067
1068 if (nlmsg_len(h) < hdrlen)
1069 return -EINVAL;
1070
1071 if (h->nlmsg_flags & NLM_F_DUMP) {
1072 if (nlmsg_attrlen(h, hdrlen)) {
1073 struct nlattr *attr;
1074 attr = nlmsg_find_attr(h, hdrlen,
1075 INET_DIAG_REQ_BYTECODE);
1076 if (attr == NULL ||
1077 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1078 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1079 return -EINVAL;
1080 }
1081 {
1082 struct netlink_dump_control c = {
1083 .dump = inet_diag_dump,
1084 };
1085 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1086 }
1087 }
1088
1089 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1090 }
1091
1092 static const struct sock_diag_handler inet_diag_handler = {
1093 .family = AF_INET,
1094 .dump = inet_diag_handler_dump,
1095 };
1096
1097 static const struct sock_diag_handler inet6_diag_handler = {
1098 .family = AF_INET6,
1099 .dump = inet_diag_handler_dump,
1100 };
1101
1102 int inet_diag_register(const struct inet_diag_handler *h)
1103 {
1104 const __u16 type = h->idiag_type;
1105 int err = -EINVAL;
1106
1107 if (type >= IPPROTO_MAX)
1108 goto out;
1109
1110 mutex_lock(&inet_diag_table_mutex);
1111 err = -EEXIST;
1112 if (inet_diag_table[type] == NULL) {
1113 inet_diag_table[type] = h;
1114 err = 0;
1115 }
1116 mutex_unlock(&inet_diag_table_mutex);
1117 out:
1118 return err;
1119 }
1120 EXPORT_SYMBOL_GPL(inet_diag_register);
1121
1122 void inet_diag_unregister(const struct inet_diag_handler *h)
1123 {
1124 const __u16 type = h->idiag_type;
1125
1126 if (type >= IPPROTO_MAX)
1127 return;
1128
1129 mutex_lock(&inet_diag_table_mutex);
1130 inet_diag_table[type] = NULL;
1131 mutex_unlock(&inet_diag_table_mutex);
1132 }
1133 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1134
1135 static int __init inet_diag_init(void)
1136 {
1137 const int inet_diag_table_size = (IPPROTO_MAX *
1138 sizeof(struct inet_diag_handler *));
1139 int err = -ENOMEM;
1140
1141 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1142 if (!inet_diag_table)
1143 goto out;
1144
1145 err = sock_diag_register(&inet_diag_handler);
1146 if (err)
1147 goto out_free_nl;
1148
1149 err = sock_diag_register(&inet6_diag_handler);
1150 if (err)
1151 goto out_free_inet;
1152
1153 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1154 out:
1155 return err;
1156
1157 out_free_inet:
1158 sock_diag_unregister(&inet_diag_handler);
1159 out_free_nl:
1160 kfree(inet_diag_table);
1161 goto out;
1162 }
1163
1164 static void __exit inet_diag_exit(void)
1165 {
1166 sock_diag_unregister(&inet6_diag_handler);
1167 sock_diag_unregister(&inet_diag_handler);
1168 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1169 kfree(inet_diag_table);
1170 }
1171
1172 module_init(inet_diag_init);
1173 module_exit(inet_diag_exit);
1174 MODULE_LICENSE("GPL");
1175 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1176 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
This page took 0.055634 seconds and 5 git commands to generate.