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Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
[mirror_ubuntu-zesty-kernel.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/cache.h>
18 #include <linux/init.h>
19 #include <linux/time.h>
20
21 #include <net/icmp.h>
22 #include <net/tcp.h>
23 #include <net/ipv6.h>
24 #include <net/inet_common.h>
25 #include <net/inet_connection_sock.h>
26 #include <net/inet_hashtables.h>
27 #include <net/inet_timewait_sock.h>
28 #include <net/inet6_hashtables.h>
29 #include <net/netlink.h>
30
31 #include <linux/inet.h>
32 #include <linux/stddef.h>
33
34 #include <linux/inet_diag.h>
35
36 static const struct inet_diag_handler **inet_diag_table;
37
38 struct inet_diag_entry {
39 __be32 *saddr;
40 __be32 *daddr;
41 u16 sport;
42 u16 dport;
43 u16 family;
44 u16 userlocks;
45 };
46
47 static struct sock *idiagnl;
48
49 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
50 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
51
52 static DEFINE_MUTEX(inet_diag_table_mutex);
53
54 static const struct inet_diag_handler *inet_diag_lock_handler(int type)
55 {
56 if (!inet_diag_table[type])
57 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
58 NETLINK_INET_DIAG, type);
59
60 mutex_lock(&inet_diag_table_mutex);
61 if (!inet_diag_table[type])
62 return ERR_PTR(-ENOENT);
63
64 return inet_diag_table[type];
65 }
66
67 static inline void inet_diag_unlock_handler(
68 const struct inet_diag_handler *handler)
69 {
70 mutex_unlock(&inet_diag_table_mutex);
71 }
72
73 static int inet_csk_diag_fill(struct sock *sk,
74 struct sk_buff *skb,
75 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
76 const struct nlmsghdr *unlh)
77 {
78 const struct inet_sock *inet = inet_sk(sk);
79 const struct inet_connection_sock *icsk = inet_csk(sk);
80 struct inet_diag_msg *r;
81 struct nlmsghdr *nlh;
82 void *info = NULL;
83 struct inet_diag_meminfo *minfo = NULL;
84 unsigned char *b = skb_tail_pointer(skb);
85 const struct inet_diag_handler *handler;
86
87 handler = inet_diag_table[unlh->nlmsg_type];
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 if (ext & (1 << (INET_DIAG_INFO - 1)))
100 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
101 handler->idiag_info_size);
102
103 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
104 const size_t len = strlen(icsk->icsk_ca_ops->name);
105
106 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
107 icsk->icsk_ca_ops->name);
108 }
109
110 r->idiag_family = sk->sk_family;
111 r->idiag_state = sk->sk_state;
112 r->idiag_timer = 0;
113 r->idiag_retrans = 0;
114
115 r->id.idiag_if = sk->sk_bound_dev_if;
116 r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
117 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
118
119 r->id.idiag_sport = inet->sport;
120 r->id.idiag_dport = inet->dport;
121 r->id.idiag_src[0] = inet->rcv_saddr;
122 r->id.idiag_dst[0] = inet->daddr;
123
124 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
125 if (r->idiag_family == AF_INET6) {
126 struct ipv6_pinfo *np = inet6_sk(sk);
127
128 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
129 &np->rcv_saddr);
130 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
131 &np->daddr);
132 }
133 #endif
134
135 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
136
137 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
138 r->idiag_timer = 1;
139 r->idiag_retrans = icsk->icsk_retransmits;
140 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
141 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
142 r->idiag_timer = 4;
143 r->idiag_retrans = icsk->icsk_probes_out;
144 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
145 } else if (timer_pending(&sk->sk_timer)) {
146 r->idiag_timer = 2;
147 r->idiag_retrans = icsk->icsk_probes_out;
148 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
149 } else {
150 r->idiag_timer = 0;
151 r->idiag_expires = 0;
152 }
153 #undef EXPIRES_IN_MS
154
155 r->idiag_uid = sock_i_uid(sk);
156 r->idiag_inode = sock_i_ino(sk);
157
158 if (minfo) {
159 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
160 minfo->idiag_wmem = sk->sk_wmem_queued;
161 minfo->idiag_fmem = sk->sk_forward_alloc;
162 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
163 }
164
165 handler->idiag_get_info(sk, r, info);
166
167 if (sk->sk_state < TCP_TIME_WAIT &&
168 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
169 icsk->icsk_ca_ops->get_info(sk, ext, skb);
170
171 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
172 return skb->len;
173
174 rtattr_failure:
175 nlmsg_failure:
176 nlmsg_trim(skb, b);
177 return -EMSGSIZE;
178 }
179
180 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
181 struct sk_buff *skb, int ext, u32 pid,
182 u32 seq, u16 nlmsg_flags,
183 const struct nlmsghdr *unlh)
184 {
185 long tmo;
186 struct inet_diag_msg *r;
187 const unsigned char *previous_tail = skb_tail_pointer(skb);
188 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
189 unlh->nlmsg_type, sizeof(*r));
190
191 r = NLMSG_DATA(nlh);
192 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
193
194 nlh->nlmsg_flags = nlmsg_flags;
195
196 tmo = tw->tw_ttd - jiffies;
197 if (tmo < 0)
198 tmo = 0;
199
200 r->idiag_family = tw->tw_family;
201 r->idiag_retrans = 0;
202 r->id.idiag_if = tw->tw_bound_dev_if;
203 r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
204 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
205 r->id.idiag_sport = tw->tw_sport;
206 r->id.idiag_dport = tw->tw_dport;
207 r->id.idiag_src[0] = tw->tw_rcv_saddr;
208 r->id.idiag_dst[0] = tw->tw_daddr;
209 r->idiag_state = tw->tw_substate;
210 r->idiag_timer = 3;
211 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
212 r->idiag_rqueue = 0;
213 r->idiag_wqueue = 0;
214 r->idiag_uid = 0;
215 r->idiag_inode = 0;
216 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
217 if (tw->tw_family == AF_INET6) {
218 const struct inet6_timewait_sock *tw6 =
219 inet6_twsk((struct sock *)tw);
220
221 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
222 &tw6->tw_v6_rcv_saddr);
223 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
224 &tw6->tw_v6_daddr);
225 }
226 #endif
227 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
228 return skb->len;
229 nlmsg_failure:
230 nlmsg_trim(skb, previous_tail);
231 return -EMSGSIZE;
232 }
233
234 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
235 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
236 const struct nlmsghdr *unlh)
237 {
238 if (sk->sk_state == TCP_TIME_WAIT)
239 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
240 skb, ext, pid, seq, nlmsg_flags,
241 unlh);
242 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
243 }
244
245 static int inet_diag_get_exact(struct sk_buff *in_skb,
246 const struct nlmsghdr *nlh)
247 {
248 int err;
249 struct sock *sk;
250 struct inet_diag_req *req = NLMSG_DATA(nlh);
251 struct sk_buff *rep;
252 struct inet_hashinfo *hashinfo;
253 const struct inet_diag_handler *handler;
254
255 handler = inet_diag_lock_handler(nlh->nlmsg_type);
256 if (IS_ERR(handler)) {
257 err = PTR_ERR(handler);
258 goto unlock;
259 }
260
261 hashinfo = handler->idiag_hashinfo;
262 err = -EINVAL;
263
264 if (req->idiag_family == AF_INET) {
265 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
266 req->id.idiag_dport, req->id.idiag_src[0],
267 req->id.idiag_sport, req->id.idiag_if);
268 }
269 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
270 else if (req->idiag_family == AF_INET6) {
271 sk = inet6_lookup(&init_net, hashinfo,
272 (struct in6_addr *)req->id.idiag_dst,
273 req->id.idiag_dport,
274 (struct in6_addr *)req->id.idiag_src,
275 req->id.idiag_sport,
276 req->id.idiag_if);
277 }
278 #endif
279 else {
280 goto unlock;
281 }
282
283 err = -ENOENT;
284 if (sk == NULL)
285 goto unlock;
286
287 err = -ESTALE;
288 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
289 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
290 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
291 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
292 goto out;
293
294 err = -ENOMEM;
295 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
296 sizeof(struct inet_diag_meminfo) +
297 handler->idiag_info_size + 64)),
298 GFP_KERNEL);
299 if (!rep)
300 goto out;
301
302 err = sk_diag_fill(sk, rep, req->idiag_ext,
303 NETLINK_CB(in_skb).pid,
304 nlh->nlmsg_seq, 0, nlh);
305 if (err < 0) {
306 WARN_ON(err == -EMSGSIZE);
307 kfree_skb(rep);
308 goto out;
309 }
310 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
311 MSG_DONTWAIT);
312 if (err > 0)
313 err = 0;
314
315 out:
316 if (sk) {
317 if (sk->sk_state == TCP_TIME_WAIT)
318 inet_twsk_put((struct inet_timewait_sock *)sk);
319 else
320 sock_put(sk);
321 }
322 unlock:
323 inet_diag_unlock_handler(handler);
324 return err;
325 }
326
327 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
328 {
329 int words = bits >> 5;
330
331 bits &= 0x1f;
332
333 if (words) {
334 if (memcmp(a1, a2, words << 2))
335 return 0;
336 }
337 if (bits) {
338 __be32 w1, w2;
339 __be32 mask;
340
341 w1 = a1[words];
342 w2 = a2[words];
343
344 mask = htonl((0xffffffff) << (32 - bits));
345
346 if ((w1 ^ w2) & mask)
347 return 0;
348 }
349
350 return 1;
351 }
352
353
354 static int inet_diag_bc_run(const void *bc, int len,
355 const struct inet_diag_entry *entry)
356 {
357 while (len > 0) {
358 int yes = 1;
359 const struct inet_diag_bc_op *op = bc;
360
361 switch (op->code) {
362 case INET_DIAG_BC_NOP:
363 break;
364 case INET_DIAG_BC_JMP:
365 yes = 0;
366 break;
367 case INET_DIAG_BC_S_GE:
368 yes = entry->sport >= op[1].no;
369 break;
370 case INET_DIAG_BC_S_LE:
371 yes = entry->dport <= op[1].no;
372 break;
373 case INET_DIAG_BC_D_GE:
374 yes = entry->dport >= op[1].no;
375 break;
376 case INET_DIAG_BC_D_LE:
377 yes = entry->dport <= op[1].no;
378 break;
379 case INET_DIAG_BC_AUTO:
380 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
381 break;
382 case INET_DIAG_BC_S_COND:
383 case INET_DIAG_BC_D_COND: {
384 struct inet_diag_hostcond *cond;
385 __be32 *addr;
386
387 cond = (struct inet_diag_hostcond *)(op + 1);
388 if (cond->port != -1 &&
389 cond->port != (op->code == INET_DIAG_BC_S_COND ?
390 entry->sport : entry->dport)) {
391 yes = 0;
392 break;
393 }
394
395 if (cond->prefix_len == 0)
396 break;
397
398 if (op->code == INET_DIAG_BC_S_COND)
399 addr = entry->saddr;
400 else
401 addr = entry->daddr;
402
403 if (bitstring_match(addr, cond->addr,
404 cond->prefix_len))
405 break;
406 if (entry->family == AF_INET6 &&
407 cond->family == AF_INET) {
408 if (addr[0] == 0 && addr[1] == 0 &&
409 addr[2] == htonl(0xffff) &&
410 bitstring_match(addr + 3, cond->addr,
411 cond->prefix_len))
412 break;
413 }
414 yes = 0;
415 break;
416 }
417 }
418
419 if (yes) {
420 len -= op->yes;
421 bc += op->yes;
422 } else {
423 len -= op->no;
424 bc += op->no;
425 }
426 }
427 return (len == 0);
428 }
429
430 static int valid_cc(const void *bc, int len, int cc)
431 {
432 while (len >= 0) {
433 const struct inet_diag_bc_op *op = bc;
434
435 if (cc > len)
436 return 0;
437 if (cc == len)
438 return 1;
439 if (op->yes < 4)
440 return 0;
441 len -= op->yes;
442 bc += op->yes;
443 }
444 return 0;
445 }
446
447 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
448 {
449 const unsigned char *bc = bytecode;
450 int len = bytecode_len;
451
452 while (len > 0) {
453 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
454
455 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
456 switch (op->code) {
457 case INET_DIAG_BC_AUTO:
458 case INET_DIAG_BC_S_COND:
459 case INET_DIAG_BC_D_COND:
460 case INET_DIAG_BC_S_GE:
461 case INET_DIAG_BC_S_LE:
462 case INET_DIAG_BC_D_GE:
463 case INET_DIAG_BC_D_LE:
464 if (op->yes < 4 || op->yes > len + 4)
465 return -EINVAL;
466 case INET_DIAG_BC_JMP:
467 if (op->no < 4 || op->no > len + 4)
468 return -EINVAL;
469 if (op->no < len &&
470 !valid_cc(bytecode, bytecode_len, len - op->no))
471 return -EINVAL;
472 break;
473 case INET_DIAG_BC_NOP:
474 if (op->yes < 4 || op->yes > len + 4)
475 return -EINVAL;
476 break;
477 default:
478 return -EINVAL;
479 }
480 bc += op->yes;
481 len -= op->yes;
482 }
483 return len == 0 ? 0 : -EINVAL;
484 }
485
486 static int inet_csk_diag_dump(struct sock *sk,
487 struct sk_buff *skb,
488 struct netlink_callback *cb)
489 {
490 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
491
492 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
493 struct inet_diag_entry entry;
494 struct rtattr *bc = (struct rtattr *)(r + 1);
495 struct inet_sock *inet = inet_sk(sk);
496
497 entry.family = sk->sk_family;
498 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
499 if (entry.family == AF_INET6) {
500 struct ipv6_pinfo *np = inet6_sk(sk);
501
502 entry.saddr = np->rcv_saddr.s6_addr32;
503 entry.daddr = np->daddr.s6_addr32;
504 } else
505 #endif
506 {
507 entry.saddr = &inet->rcv_saddr;
508 entry.daddr = &inet->daddr;
509 }
510 entry.sport = inet->num;
511 entry.dport = ntohs(inet->dport);
512 entry.userlocks = sk->sk_userlocks;
513
514 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
515 return 0;
516 }
517
518 return inet_csk_diag_fill(sk, skb, r->idiag_ext,
519 NETLINK_CB(cb->skb).pid,
520 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
521 }
522
523 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
524 struct sk_buff *skb,
525 struct netlink_callback *cb)
526 {
527 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
528
529 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
530 struct inet_diag_entry entry;
531 struct rtattr *bc = (struct rtattr *)(r + 1);
532
533 entry.family = tw->tw_family;
534 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
535 if (tw->tw_family == AF_INET6) {
536 struct inet6_timewait_sock *tw6 =
537 inet6_twsk((struct sock *)tw);
538 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
539 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
540 } else
541 #endif
542 {
543 entry.saddr = &tw->tw_rcv_saddr;
544 entry.daddr = &tw->tw_daddr;
545 }
546 entry.sport = tw->tw_num;
547 entry.dport = ntohs(tw->tw_dport);
548 entry.userlocks = 0;
549
550 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
551 return 0;
552 }
553
554 return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
555 NETLINK_CB(cb->skb).pid,
556 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
557 }
558
559 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
560 struct request_sock *req, u32 pid, u32 seq,
561 const struct nlmsghdr *unlh)
562 {
563 const struct inet_request_sock *ireq = inet_rsk(req);
564 struct inet_sock *inet = inet_sk(sk);
565 unsigned char *b = skb_tail_pointer(skb);
566 struct inet_diag_msg *r;
567 struct nlmsghdr *nlh;
568 long tmo;
569
570 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
571 nlh->nlmsg_flags = NLM_F_MULTI;
572 r = NLMSG_DATA(nlh);
573
574 r->idiag_family = sk->sk_family;
575 r->idiag_state = TCP_SYN_RECV;
576 r->idiag_timer = 1;
577 r->idiag_retrans = req->retrans;
578
579 r->id.idiag_if = sk->sk_bound_dev_if;
580 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
581 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
582
583 tmo = req->expires - jiffies;
584 if (tmo < 0)
585 tmo = 0;
586
587 r->id.idiag_sport = inet->sport;
588 r->id.idiag_dport = ireq->rmt_port;
589 r->id.idiag_src[0] = ireq->loc_addr;
590 r->id.idiag_dst[0] = ireq->rmt_addr;
591 r->idiag_expires = jiffies_to_msecs(tmo);
592 r->idiag_rqueue = 0;
593 r->idiag_wqueue = 0;
594 r->idiag_uid = sock_i_uid(sk);
595 r->idiag_inode = 0;
596 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
597 if (r->idiag_family == AF_INET6) {
598 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
599 &inet6_rsk(req)->loc_addr);
600 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
601 &inet6_rsk(req)->rmt_addr);
602 }
603 #endif
604 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
605
606 return skb->len;
607
608 nlmsg_failure:
609 nlmsg_trim(skb, b);
610 return -1;
611 }
612
613 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
614 struct netlink_callback *cb)
615 {
616 struct inet_diag_entry entry;
617 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
618 struct inet_connection_sock *icsk = inet_csk(sk);
619 struct listen_sock *lopt;
620 struct rtattr *bc = NULL;
621 struct inet_sock *inet = inet_sk(sk);
622 int j, s_j;
623 int reqnum, s_reqnum;
624 int err = 0;
625
626 s_j = cb->args[3];
627 s_reqnum = cb->args[4];
628
629 if (s_j > 0)
630 s_j--;
631
632 entry.family = sk->sk_family;
633
634 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
635
636 lopt = icsk->icsk_accept_queue.listen_opt;
637 if (!lopt || !lopt->qlen)
638 goto out;
639
640 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
641 bc = (struct rtattr *)(r + 1);
642 entry.sport = inet->num;
643 entry.userlocks = sk->sk_userlocks;
644 }
645
646 for (j = s_j; j < lopt->nr_table_entries; j++) {
647 struct request_sock *req, *head = lopt->syn_table[j];
648
649 reqnum = 0;
650 for (req = head; req; reqnum++, req = req->dl_next) {
651 struct inet_request_sock *ireq = inet_rsk(req);
652
653 if (reqnum < s_reqnum)
654 continue;
655 if (r->id.idiag_dport != ireq->rmt_port &&
656 r->id.idiag_dport)
657 continue;
658
659 if (bc) {
660 entry.saddr =
661 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
662 (entry.family == AF_INET6) ?
663 inet6_rsk(req)->loc_addr.s6_addr32 :
664 #endif
665 &ireq->loc_addr;
666 entry.daddr =
667 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
668 (entry.family == AF_INET6) ?
669 inet6_rsk(req)->rmt_addr.s6_addr32 :
670 #endif
671 &ireq->rmt_addr;
672 entry.dport = ntohs(ireq->rmt_port);
673
674 if (!inet_diag_bc_run(RTA_DATA(bc),
675 RTA_PAYLOAD(bc), &entry))
676 continue;
677 }
678
679 err = inet_diag_fill_req(skb, sk, req,
680 NETLINK_CB(cb->skb).pid,
681 cb->nlh->nlmsg_seq, cb->nlh);
682 if (err < 0) {
683 cb->args[3] = j + 1;
684 cb->args[4] = reqnum;
685 goto out;
686 }
687 }
688
689 s_reqnum = 0;
690 }
691
692 out:
693 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
694
695 return err;
696 }
697
698 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
699 {
700 int i, num;
701 int s_i, s_num;
702 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
703 const struct inet_diag_handler *handler;
704 struct inet_hashinfo *hashinfo;
705
706 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
707 if (IS_ERR(handler))
708 goto unlock;
709
710 hashinfo = handler->idiag_hashinfo;
711
712 s_i = cb->args[1];
713 s_num = num = cb->args[2];
714
715 if (cb->args[0] == 0) {
716 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
717 goto skip_listen_ht;
718
719 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
720 struct sock *sk;
721 struct hlist_nulls_node *node;
722 struct inet_listen_hashbucket *ilb;
723
724 num = 0;
725 ilb = &hashinfo->listening_hash[i];
726 spin_lock_bh(&ilb->lock);
727 sk_nulls_for_each(sk, node, &ilb->head) {
728 struct inet_sock *inet = inet_sk(sk);
729
730 if (num < s_num) {
731 num++;
732 continue;
733 }
734
735 if (r->id.idiag_sport != inet->sport &&
736 r->id.idiag_sport)
737 goto next_listen;
738
739 if (!(r->idiag_states & TCPF_LISTEN) ||
740 r->id.idiag_dport ||
741 cb->args[3] > 0)
742 goto syn_recv;
743
744 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
745 spin_unlock_bh(&ilb->lock);
746 goto done;
747 }
748
749 syn_recv:
750 if (!(r->idiag_states & TCPF_SYN_RECV))
751 goto next_listen;
752
753 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
754 spin_unlock_bh(&ilb->lock);
755 goto done;
756 }
757
758 next_listen:
759 cb->args[3] = 0;
760 cb->args[4] = 0;
761 ++num;
762 }
763 spin_unlock_bh(&ilb->lock);
764
765 s_num = 0;
766 cb->args[3] = 0;
767 cb->args[4] = 0;
768 }
769 skip_listen_ht:
770 cb->args[0] = 1;
771 s_i = num = s_num = 0;
772 }
773
774 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
775 goto unlock;
776
777 for (i = s_i; i < hashinfo->ehash_size; i++) {
778 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
779 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
780 struct sock *sk;
781 struct hlist_nulls_node *node;
782
783 num = 0;
784
785 if (hlist_nulls_empty(&head->chain) &&
786 hlist_nulls_empty(&head->twchain))
787 continue;
788
789 if (i > s_i)
790 s_num = 0;
791
792 spin_lock_bh(lock);
793 sk_nulls_for_each(sk, node, &head->chain) {
794 struct inet_sock *inet = inet_sk(sk);
795
796 if (num < s_num)
797 goto next_normal;
798 if (!(r->idiag_states & (1 << sk->sk_state)))
799 goto next_normal;
800 if (r->id.idiag_sport != inet->sport &&
801 r->id.idiag_sport)
802 goto next_normal;
803 if (r->id.idiag_dport != inet->dport &&
804 r->id.idiag_dport)
805 goto next_normal;
806 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
807 spin_unlock_bh(lock);
808 goto done;
809 }
810 next_normal:
811 ++num;
812 }
813
814 if (r->idiag_states & TCPF_TIME_WAIT) {
815 struct inet_timewait_sock *tw;
816
817 inet_twsk_for_each(tw, node,
818 &head->twchain) {
819
820 if (num < s_num)
821 goto next_dying;
822 if (r->id.idiag_sport != tw->tw_sport &&
823 r->id.idiag_sport)
824 goto next_dying;
825 if (r->id.idiag_dport != tw->tw_dport &&
826 r->id.idiag_dport)
827 goto next_dying;
828 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
829 spin_unlock_bh(lock);
830 goto done;
831 }
832 next_dying:
833 ++num;
834 }
835 }
836 spin_unlock_bh(lock);
837 }
838
839 done:
840 cb->args[1] = i;
841 cb->args[2] = num;
842 unlock:
843 inet_diag_unlock_handler(handler);
844 return skb->len;
845 }
846
847 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
848 {
849 int hdrlen = sizeof(struct inet_diag_req);
850
851 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
852 nlmsg_len(nlh) < hdrlen)
853 return -EINVAL;
854
855 if (nlh->nlmsg_flags & NLM_F_DUMP) {
856 if (nlmsg_attrlen(nlh, hdrlen)) {
857 struct nlattr *attr;
858
859 attr = nlmsg_find_attr(nlh, hdrlen,
860 INET_DIAG_REQ_BYTECODE);
861 if (attr == NULL ||
862 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
863 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
864 return -EINVAL;
865 }
866
867 return netlink_dump_start(idiagnl, skb, nlh,
868 inet_diag_dump, NULL);
869 }
870
871 return inet_diag_get_exact(skb, nlh);
872 }
873
874 static DEFINE_MUTEX(inet_diag_mutex);
875
876 static void inet_diag_rcv(struct sk_buff *skb)
877 {
878 mutex_lock(&inet_diag_mutex);
879 netlink_rcv_skb(skb, &inet_diag_rcv_msg);
880 mutex_unlock(&inet_diag_mutex);
881 }
882
883 int inet_diag_register(const struct inet_diag_handler *h)
884 {
885 const __u16 type = h->idiag_type;
886 int err = -EINVAL;
887
888 if (type >= INET_DIAG_GETSOCK_MAX)
889 goto out;
890
891 mutex_lock(&inet_diag_table_mutex);
892 err = -EEXIST;
893 if (inet_diag_table[type] == NULL) {
894 inet_diag_table[type] = h;
895 err = 0;
896 }
897 mutex_unlock(&inet_diag_table_mutex);
898 out:
899 return err;
900 }
901 EXPORT_SYMBOL_GPL(inet_diag_register);
902
903 void inet_diag_unregister(const struct inet_diag_handler *h)
904 {
905 const __u16 type = h->idiag_type;
906
907 if (type >= INET_DIAG_GETSOCK_MAX)
908 return;
909
910 mutex_lock(&inet_diag_table_mutex);
911 inet_diag_table[type] = NULL;
912 mutex_unlock(&inet_diag_table_mutex);
913 }
914 EXPORT_SYMBOL_GPL(inet_diag_unregister);
915
916 static int __init inet_diag_init(void)
917 {
918 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
919 sizeof(struct inet_diag_handler *));
920 int err = -ENOMEM;
921
922 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
923 if (!inet_diag_table)
924 goto out;
925
926 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
927 inet_diag_rcv, NULL, THIS_MODULE);
928 if (idiagnl == NULL)
929 goto out_free_table;
930 err = 0;
931 out:
932 return err;
933 out_free_table:
934 kfree(inet_diag_table);
935 goto out;
936 }
937
938 static void __exit inet_diag_exit(void)
939 {
940 netlink_kernel_release(idiagnl);
941 kfree(inet_diag_table);
942 }
943
944 module_init(inet_diag_init);
945 module_exit(inet_diag_exit);
946 MODULE_LICENSE("GPL");
947 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);
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