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Merge remote-tracking branch 'sysctl/master'
[linux-2.6/next.git] / net / ipv4 / inet_diag.c
blob389a2e6a17fd84f67df22f57bbedbc8e211bded6
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
37 static const struct inet_diag_handler **inet_diag_table;
38
39 struct inet_diag_entry {
40 __be32 *saddr;
41 __be32 *daddr;
42 u16 sport;
43 u16 dport;
44 u16 family;
45 u16 userlocks;
46 };
47
48 static struct sock *idiagnl;
49
50 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
51 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
52
53 static DEFINE_MUTEX(inet_diag_table_mutex);
54
55 static const struct inet_diag_handler *inet_diag_lock_handler(int type)
56 {
57 if (!inet_diag_table[type])
58 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
59 NETLINK_INET_DIAG, type);
60
61 mutex_lock(&inet_diag_table_mutex);
62 if (!inet_diag_table[type])
63 return ERR_PTR(-ENOENT);
64
65 return inet_diag_table[type];
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 static int inet_csk_diag_fill(struct sock *sk,
75 struct sk_buff *skb,
76 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
77 const struct nlmsghdr *unlh)
78 {
79 const struct inet_sock *inet = inet_sk(sk);
80 const struct inet_connection_sock *icsk = inet_csk(sk);
81 struct inet_diag_msg *r;
82 struct nlmsghdr *nlh;
83 void *info = NULL;
84 struct inet_diag_meminfo *minfo = NULL;
85 unsigned char *b = skb_tail_pointer(skb);
86 const struct inet_diag_handler *handler;
87
88 handler = inet_diag_table[unlh->nlmsg_type];
89 BUG_ON(handler == NULL);
90
91 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
92 nlh->nlmsg_flags = nlmsg_flags;
93
94 r = NLMSG_DATA(nlh);
95 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
96
97 if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
98 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
99
100 if (ext & (1 << (INET_DIAG_INFO - 1)))
101 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
102 handler->idiag_info_size);
103
104 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
105 const size_t len = strlen(icsk->icsk_ca_ops->name);
106
107 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
108 icsk->icsk_ca_ops->name);
109 }
110
111 r->idiag_family = sk->sk_family;
112 r->idiag_state = sk->sk_state;
113 r->idiag_timer = 0;
114 r->idiag_retrans = 0;
115
116 r->id.idiag_if = sk->sk_bound_dev_if;
117 r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
118 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
119
120 r->id.idiag_sport = inet->inet_sport;
121 r->id.idiag_dport = inet->inet_dport;
122 r->id.idiag_src[0] = inet->inet_rcv_saddr;
123 r->id.idiag_dst[0] = inet->inet_daddr;
124
125 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
126 if (r->idiag_family == AF_INET6) {
127 const struct ipv6_pinfo *np = inet6_sk(sk);
128
129 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
130 &np->rcv_saddr);
131 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
132 &np->daddr);
133 }
134 #endif
135
136 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
137
138 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
139 r->idiag_timer = 1;
140 r->idiag_retrans = icsk->icsk_retransmits;
141 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
142 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
143 r->idiag_timer = 4;
144 r->idiag_retrans = icsk->icsk_probes_out;
145 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
146 } else if (timer_pending(&sk->sk_timer)) {
147 r->idiag_timer = 2;
148 r->idiag_retrans = icsk->icsk_probes_out;
149 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
150 } else {
151 r->idiag_timer = 0;
152 r->idiag_expires = 0;
153 }
154 #undef EXPIRES_IN_MS
155
156 r->idiag_uid = sock_i_uid(sk);
157 r->idiag_inode = sock_i_ino(sk);
158
159 if (minfo) {
160 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
161 minfo->idiag_wmem = sk->sk_wmem_queued;
162 minfo->idiag_fmem = sk->sk_forward_alloc;
163 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
164 }
165
166 handler->idiag_get_info(sk, r, info);
167
168 if (sk->sk_state < TCP_TIME_WAIT &&
169 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
170 icsk->icsk_ca_ops->get_info(sk, ext, skb);
171
172 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
173 return skb->len;
174
175 rtattr_failure:
176 nlmsg_failure:
177 nlmsg_trim(skb, b);
178 return -EMSGSIZE;
179 }
180
181 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
182 struct sk_buff *skb, int ext, u32 pid,
183 u32 seq, u16 nlmsg_flags,
184 const struct nlmsghdr *unlh)
185 {
186 long tmo;
187 struct inet_diag_msg *r;
188 const unsigned char *previous_tail = skb_tail_pointer(skb);
189 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
190 unlh->nlmsg_type, sizeof(*r));
191
192 r = NLMSG_DATA(nlh);
193 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
194
195 nlh->nlmsg_flags = nlmsg_flags;
196
197 tmo = tw->tw_ttd - jiffies;
198 if (tmo < 0)
199 tmo = 0;
200
201 r->idiag_family = tw->tw_family;
202 r->idiag_retrans = 0;
203 r->id.idiag_if = tw->tw_bound_dev_if;
204 r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
205 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
206 r->id.idiag_sport = tw->tw_sport;
207 r->id.idiag_dport = tw->tw_dport;
208 r->id.idiag_src[0] = tw->tw_rcv_saddr;
209 r->id.idiag_dst[0] = tw->tw_daddr;
210 r->idiag_state = tw->tw_substate;
211 r->idiag_timer = 3;
212 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
213 r->idiag_rqueue = 0;
214 r->idiag_wqueue = 0;
215 r->idiag_uid = 0;
216 r->idiag_inode = 0;
217 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
218 if (tw->tw_family == AF_INET6) {
219 const struct inet6_timewait_sock *tw6 =
220 inet6_twsk((struct sock *)tw);
221
222 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
223 &tw6->tw_v6_rcv_saddr);
224 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
225 &tw6->tw_v6_daddr);
226 }
227 #endif
228 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
229 return skb->len;
230 nlmsg_failure:
231 nlmsg_trim(skb, previous_tail);
232 return -EMSGSIZE;
233 }
234
235 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
236 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
237 const struct nlmsghdr *unlh)
238 {
239 if (sk->sk_state == TCP_TIME_WAIT)
240 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
241 skb, ext, pid, seq, nlmsg_flags,
242 unlh);
243 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
244 }
245
246 static int inet_diag_get_exact(struct sk_buff *in_skb,
247 const struct nlmsghdr *nlh)
248 {
249 int err;
250 struct sock *sk;
251 struct inet_diag_req *req = NLMSG_DATA(nlh);
252 struct sk_buff *rep;
253 struct inet_hashinfo *hashinfo;
254 const struct inet_diag_handler *handler;
255
256 handler = inet_diag_lock_handler(nlh->nlmsg_type);
257 if (IS_ERR(handler)) {
258 err = PTR_ERR(handler);
259 goto unlock;
260 }
261
262 hashinfo = handler->idiag_hashinfo;
263 err = -EINVAL;
264
265 if (req->idiag_family == AF_INET) {
266 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
267 req->id.idiag_dport, req->id.idiag_src[0],
268 req->id.idiag_sport, req->id.idiag_if);
269 }
270 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
271 else if (req->idiag_family == AF_INET6) {
272 sk = inet6_lookup(&init_net, hashinfo,
273 (struct in6_addr *)req->id.idiag_dst,
274 req->id.idiag_dport,
275 (struct in6_addr *)req->id.idiag_src,
276 req->id.idiag_sport,
277 req->id.idiag_if);
278 }
279 #endif
280 else {
281 goto unlock;
282 }
283
284 err = -ENOENT;
285 if (sk == NULL)
286 goto unlock;
287
288 err = -ESTALE;
289 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
290 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
291 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
292 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
293 goto out;
294
295 err = -ENOMEM;
296 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
297 sizeof(struct inet_diag_meminfo) +
298 handler->idiag_info_size + 64)),
299 GFP_KERNEL);
300 if (!rep)
301 goto out;
302
303 err = sk_diag_fill(sk, rep, req->idiag_ext,
304 NETLINK_CB(in_skb).pid,
305 nlh->nlmsg_seq, 0, nlh);
306 if (err < 0) {
307 WARN_ON(err == -EMSGSIZE);
308 kfree_skb(rep);
309 goto out;
310 }
311 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
312 MSG_DONTWAIT);
313 if (err > 0)
314 err = 0;
315
316 out:
317 if (sk) {
318 if (sk->sk_state == TCP_TIME_WAIT)
319 inet_twsk_put((struct inet_timewait_sock *)sk);
320 else
321 sock_put(sk);
322 }
323 unlock:
324 inet_diag_unlock_handler(handler);
325 return err;
326 }
327
328 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
329 {
330 int words = bits >> 5;
331
332 bits &= 0x1f;
333
334 if (words) {
335 if (memcmp(a1, a2, words << 2))
336 return 0;
337 }
338 if (bits) {
339 __be32 w1, w2;
340 __be32 mask;
341
342 w1 = a1[words];
343 w2 = a2[words];
344
345 mask = htonl((0xffffffff) << (32 - bits));
346
347 if ((w1 ^ w2) & mask)
348 return 0;
349 }
350
351 return 1;
352 }
353
354
355 static int inet_diag_bc_run(const void *bc, int len,
356 const struct inet_diag_entry *entry)
357 {
358 while (len > 0) {
359 int yes = 1;
360 const struct inet_diag_bc_op *op = bc;
361
362 switch (op->code) {
363 case INET_DIAG_BC_NOP:
364 break;
365 case INET_DIAG_BC_JMP:
366 yes = 0;
367 break;
368 case INET_DIAG_BC_S_GE:
369 yes = entry->sport >= op[1].no;
370 break;
371 case INET_DIAG_BC_S_LE:
372 yes = entry->sport <= op[1].no;
373 break;
374 case INET_DIAG_BC_D_GE:
375 yes = entry->dport >= op[1].no;
376 break;
377 case INET_DIAG_BC_D_LE:
378 yes = entry->dport <= op[1].no;
379 break;
380 case INET_DIAG_BC_AUTO:
381 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
382 break;
383 case INET_DIAG_BC_S_COND:
384 case INET_DIAG_BC_D_COND: {
385 struct inet_diag_hostcond *cond;
386 __be32 *addr;
387
388 cond = (struct inet_diag_hostcond *)(op + 1);
389 if (cond->port != -1 &&
390 cond->port != (op->code == INET_DIAG_BC_S_COND ?
391 entry->sport : entry->dport)) {
392 yes = 0;
393 break;
394 }
395
396 if (cond->prefix_len == 0)
397 break;
398
399 if (op->code == INET_DIAG_BC_S_COND)
400 addr = entry->saddr;
401 else
402 addr = entry->daddr;
403
404 if (bitstring_match(addr, cond->addr,
405 cond->prefix_len))
406 break;
407 if (entry->family == AF_INET6 &&
408 cond->family == AF_INET) {
409 if (addr[0] == 0 && addr[1] == 0 &&
410 addr[2] == htonl(0xffff) &&
411 bitstring_match(addr + 3, cond->addr,
412 cond->prefix_len))
413 break;
414 }
415 yes = 0;
416 break;
417 }
418 }
419
420 if (yes) {
421 len -= op->yes;
422 bc += op->yes;
423 } else {
424 len -= op->no;
425 bc += op->no;
426 }
427 }
428 return len == 0;
429 }
430
431 static int valid_cc(const void *bc, int len, int cc)
432 {
433 while (len >= 0) {
434 const struct inet_diag_bc_op *op = bc;
435
436 if (cc > len)
437 return 0;
438 if (cc == len)
439 return 1;
440 if (op->yes < 4 || op->yes & 3)
441 return 0;
442 len -= op->yes;
443 bc += op->yes;
444 }
445 return 0;
446 }
447
448 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
449 {
450 const void *bc = bytecode;
451 int len = bytecode_len;
452
453 while (len > 0) {
454 const struct inet_diag_bc_op *op = bc;
455
456 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
457 switch (op->code) {
458 case INET_DIAG_BC_AUTO:
459 case INET_DIAG_BC_S_COND:
460 case INET_DIAG_BC_D_COND:
461 case INET_DIAG_BC_S_GE:
462 case INET_DIAG_BC_S_LE:
463 case INET_DIAG_BC_D_GE:
464 case INET_DIAG_BC_D_LE:
465 case INET_DIAG_BC_JMP:
466 if (op->no < 4 || op->no > len + 4 || op->no & 3)
467 return -EINVAL;
468 if (op->no < len &&
469 !valid_cc(bytecode, bytecode_len, len - op->no))
470 return -EINVAL;
471 break;
472 case INET_DIAG_BC_NOP:
473 break;
474 default:
475 return -EINVAL;
476 }
477 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
478 return -EINVAL;
479 bc += op->yes;
480 len -= op->yes;
481 }
482 return len == 0 ? 0 : -EINVAL;
483 }
484
485 static int inet_csk_diag_dump(struct sock *sk,
486 struct sk_buff *skb,
487 struct netlink_callback *cb)
488 {
489 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
490
491 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
492 struct inet_diag_entry entry;
493 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
494 sizeof(*r),
495 INET_DIAG_REQ_BYTECODE);
496 struct inet_sock *inet = inet_sk(sk);
497
498 entry.family = sk->sk_family;
499 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
500 if (entry.family == AF_INET6) {
501 struct ipv6_pinfo *np = inet6_sk(sk);
502
503 entry.saddr = np->rcv_saddr.s6_addr32;
504 entry.daddr = np->daddr.s6_addr32;
505 } else
506 #endif
507 {
508 entry.saddr = &inet->inet_rcv_saddr;
509 entry.daddr = &inet->inet_daddr;
510 }
511 entry.sport = inet->inet_num;
512 entry.dport = ntohs(inet->inet_dport);
513 entry.userlocks = sk->sk_userlocks;
514
515 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
516 return 0;
517 }
518
519 return inet_csk_diag_fill(sk, skb, r->idiag_ext,
520 NETLINK_CB(cb->skb).pid,
521 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
522 }
523
524 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
525 struct sk_buff *skb,
526 struct netlink_callback *cb)
527 {
528 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
529
530 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
531 struct inet_diag_entry entry;
532 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
533 sizeof(*r),
534 INET_DIAG_REQ_BYTECODE);
535
536 entry.family = tw->tw_family;
537 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
538 if (tw->tw_family == AF_INET6) {
539 struct inet6_timewait_sock *tw6 =
540 inet6_twsk((struct sock *)tw);
541 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
542 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
543 } else
544 #endif
545 {
546 entry.saddr = &tw->tw_rcv_saddr;
547 entry.daddr = &tw->tw_daddr;
548 }
549 entry.sport = tw->tw_num;
550 entry.dport = ntohs(tw->tw_dport);
551 entry.userlocks = 0;
552
553 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
554 return 0;
555 }
556
557 return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
558 NETLINK_CB(cb->skb).pid,
559 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
560 }
561
562 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
563 struct request_sock *req, u32 pid, u32 seq,
564 const struct nlmsghdr *unlh)
565 {
566 const struct inet_request_sock *ireq = inet_rsk(req);
567 struct inet_sock *inet = inet_sk(sk);
568 unsigned char *b = skb_tail_pointer(skb);
569 struct inet_diag_msg *r;
570 struct nlmsghdr *nlh;
571 long tmo;
572
573 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
574 nlh->nlmsg_flags = NLM_F_MULTI;
575 r = NLMSG_DATA(nlh);
576
577 r->idiag_family = sk->sk_family;
578 r->idiag_state = TCP_SYN_RECV;
579 r->idiag_timer = 1;
580 r->idiag_retrans = req->retrans;
581
582 r->id.idiag_if = sk->sk_bound_dev_if;
583 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
584 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
585
586 tmo = req->expires - jiffies;
587 if (tmo < 0)
588 tmo = 0;
589
590 r->id.idiag_sport = inet->inet_sport;
591 r->id.idiag_dport = ireq->rmt_port;
592 r->id.idiag_src[0] = ireq->loc_addr;
593 r->id.idiag_dst[0] = ireq->rmt_addr;
594 r->idiag_expires = jiffies_to_msecs(tmo);
595 r->idiag_rqueue = 0;
596 r->idiag_wqueue = 0;
597 r->idiag_uid = sock_i_uid(sk);
598 r->idiag_inode = 0;
599 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
600 if (r->idiag_family == AF_INET6) {
601 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
602 &inet6_rsk(req)->loc_addr);
603 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
604 &inet6_rsk(req)->rmt_addr);
605 }
606 #endif
607 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
608
609 return skb->len;
610
611 nlmsg_failure:
612 nlmsg_trim(skb, b);
613 return -1;
614 }
615
616 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
617 struct netlink_callback *cb)
618 {
619 struct inet_diag_entry entry;
620 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
621 struct inet_connection_sock *icsk = inet_csk(sk);
622 struct listen_sock *lopt;
623 const struct nlattr *bc = NULL;
624 struct inet_sock *inet = inet_sk(sk);
625 int j, s_j;
626 int reqnum, s_reqnum;
627 int err = 0;
628
629 s_j = cb->args[3];
630 s_reqnum = cb->args[4];
631
632 if (s_j > 0)
633 s_j--;
634
635 entry.family = sk->sk_family;
636
637 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
638
639 lopt = icsk->icsk_accept_queue.listen_opt;
640 if (!lopt || !lopt->qlen)
641 goto out;
642
643 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
644 bc = nlmsg_find_attr(cb->nlh, sizeof(*r),
645 INET_DIAG_REQ_BYTECODE);
646 entry.sport = inet->inet_num;
647 entry.userlocks = sk->sk_userlocks;
648 }
649
650 for (j = s_j; j < lopt->nr_table_entries; j++) {
651 struct request_sock *req, *head = lopt->syn_table[j];
652
653 reqnum = 0;
654 for (req = head; req; reqnum++, req = req->dl_next) {
655 struct inet_request_sock *ireq = inet_rsk(req);
656
657 if (reqnum < s_reqnum)
658 continue;
659 if (r->id.idiag_dport != ireq->rmt_port &&
660 r->id.idiag_dport)
661 continue;
662
663 if (bc) {
664 entry.saddr =
665 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
666 (entry.family == AF_INET6) ?
667 inet6_rsk(req)->loc_addr.s6_addr32 :
668 #endif
669 &ireq->loc_addr;
670 entry.daddr =
671 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
672 (entry.family == AF_INET6) ?
673 inet6_rsk(req)->rmt_addr.s6_addr32 :
674 #endif
675 &ireq->rmt_addr;
676 entry.dport = ntohs(ireq->rmt_port);
677
678 if (!inet_diag_bc_run(nla_data(bc),
679 nla_len(bc), &entry))
680 continue;
681 }
682
683 err = inet_diag_fill_req(skb, sk, req,
684 NETLINK_CB(cb->skb).pid,
685 cb->nlh->nlmsg_seq, cb->nlh);
686 if (err < 0) {
687 cb->args[3] = j + 1;
688 cb->args[4] = reqnum;
689 goto out;
690 }
691 }
692
693 s_reqnum = 0;
694 }
695
696 out:
697 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
698
699 return err;
700 }
701
702 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
703 {
704 int i, num;
705 int s_i, s_num;
706 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
707 const struct inet_diag_handler *handler;
708 struct inet_hashinfo *hashinfo;
709
710 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
711 if (IS_ERR(handler))
712 goto unlock;
713
714 hashinfo = handler->idiag_hashinfo;
715
716 s_i = cb->args[1];
717 s_num = num = cb->args[2];
718
719 if (cb->args[0] == 0) {
720 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
721 goto skip_listen_ht;
722
723 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
724 struct sock *sk;
725 struct hlist_nulls_node *node;
726 struct inet_listen_hashbucket *ilb;
727
728 num = 0;
729 ilb = &hashinfo->listening_hash[i];
730 spin_lock_bh(&ilb->lock);
731 sk_nulls_for_each(sk, node, &ilb->head) {
732 struct inet_sock *inet = inet_sk(sk);
733
734 if (num < s_num) {
735 num++;
736 continue;
737 }
738
739 if (r->id.idiag_sport != inet->inet_sport &&
740 r->id.idiag_sport)
741 goto next_listen;
742
743 if (!(r->idiag_states & TCPF_LISTEN) ||
744 r->id.idiag_dport ||
745 cb->args[3] > 0)
746 goto syn_recv;
747
748 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
749 spin_unlock_bh(&ilb->lock);
750 goto done;
751 }
752
753 syn_recv:
754 if (!(r->idiag_states & TCPF_SYN_RECV))
755 goto next_listen;
756
757 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
758 spin_unlock_bh(&ilb->lock);
759 goto done;
760 }
761
762 next_listen:
763 cb->args[3] = 0;
764 cb->args[4] = 0;
765 ++num;
766 }
767 spin_unlock_bh(&ilb->lock);
768
769 s_num = 0;
770 cb->args[3] = 0;
771 cb->args[4] = 0;
772 }
773 skip_listen_ht:
774 cb->args[0] = 1;
775 s_i = num = s_num = 0;
776 }
777
778 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
779 goto unlock;
780
781 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
782 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
783 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
784 struct sock *sk;
785 struct hlist_nulls_node *node;
786
787 num = 0;
788
789 if (hlist_nulls_empty(&head->chain) &&
790 hlist_nulls_empty(&head->twchain))
791 continue;
792
793 if (i > s_i)
794 s_num = 0;
795
796 spin_lock_bh(lock);
797 sk_nulls_for_each(sk, node, &head->chain) {
798 struct inet_sock *inet = inet_sk(sk);
799
800 if (num < s_num)
801 goto next_normal;
802 if (!(r->idiag_states & (1 << sk->sk_state)))
803 goto next_normal;
804 if (r->id.idiag_sport != inet->inet_sport &&
805 r->id.idiag_sport)
806 goto next_normal;
807 if (r->id.idiag_dport != inet->inet_dport &&
808 r->id.idiag_dport)
809 goto next_normal;
810 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
811 spin_unlock_bh(lock);
812 goto done;
813 }
814 next_normal:
815 ++num;
816 }
817
818 if (r->idiag_states & TCPF_TIME_WAIT) {
819 struct inet_timewait_sock *tw;
820
821 inet_twsk_for_each(tw, node,
822 &head->twchain) {
823
824 if (num < s_num)
825 goto next_dying;
826 if (r->id.idiag_sport != tw->tw_sport &&
827 r->id.idiag_sport)
828 goto next_dying;
829 if (r->id.idiag_dport != tw->tw_dport &&
830 r->id.idiag_dport)
831 goto next_dying;
832 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
833 spin_unlock_bh(lock);
834 goto done;
835 }
836 next_dying:
837 ++num;
838 }
839 }
840 spin_unlock_bh(lock);
841 }
842
843 done:
844 cb->args[1] = i;
845 cb->args[2] = num;
846 unlock:
847 inet_diag_unlock_handler(handler);
848 return skb->len;
849 }
850
851 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
852 {
853 int hdrlen = sizeof(struct inet_diag_req);
854
855 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
856 nlmsg_len(nlh) < hdrlen)
857 return -EINVAL;
858
859 if (nlh->nlmsg_flags & NLM_F_DUMP) {
860 if (nlmsg_attrlen(nlh, hdrlen)) {
861 struct nlattr *attr;
862
863 attr = nlmsg_find_attr(nlh, hdrlen,
864 INET_DIAG_REQ_BYTECODE);
865 if (attr == NULL ||
866 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
867 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
868 return -EINVAL;
869 }
870
871 return netlink_dump_start(idiagnl, skb, nlh,
872 inet_diag_dump, NULL, 0);
873 }
874
875 return inet_diag_get_exact(skb, nlh);
876 }
877
878 static DEFINE_MUTEX(inet_diag_mutex);
879
880 static void inet_diag_rcv(struct sk_buff *skb)
881 {
882 mutex_lock(&inet_diag_mutex);
883 netlink_rcv_skb(skb, &inet_diag_rcv_msg);
884 mutex_unlock(&inet_diag_mutex);
885 }
886
887 int inet_diag_register(const struct inet_diag_handler *h)
888 {
889 const __u16 type = h->idiag_type;
890 int err = -EINVAL;
891
892 if (type >= INET_DIAG_GETSOCK_MAX)
893 goto out;
894
895 mutex_lock(&inet_diag_table_mutex);
896 err = -EEXIST;
897 if (inet_diag_table[type] == NULL) {
898 inet_diag_table[type] = h;
899 err = 0;
900 }
901 mutex_unlock(&inet_diag_table_mutex);
902 out:
903 return err;
904 }
905 EXPORT_SYMBOL_GPL(inet_diag_register);
906
907 void inet_diag_unregister(const struct inet_diag_handler *h)
908 {
909 const __u16 type = h->idiag_type;
910
911 if (type >= INET_DIAG_GETSOCK_MAX)
912 return;
913
914 mutex_lock(&inet_diag_table_mutex);
915 inet_diag_table[type] = NULL;
916 mutex_unlock(&inet_diag_table_mutex);
917 }
918 EXPORT_SYMBOL_GPL(inet_diag_unregister);
919
920 static int __init inet_diag_init(void)
921 {
922 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
923 sizeof(struct inet_diag_handler *));
924 int err = -ENOMEM;
925
926 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
927 if (!inet_diag_table)
928 goto out;
929
930 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
931 inet_diag_rcv, NULL, THIS_MODULE);
932 if (idiagnl == NULL)
933 goto out_free_table;
934 err = 0;
935 out:
936 return err;
937 out_free_table:
938 kfree(inet_diag_table);
939 goto out;
940 }
941
942 static void __exit inet_diag_exit(void)
943 {
944 netlink_kernel_release(idiagnl);
945 kfree(inet_diag_table);
946 }
947
948 module_init(inet_diag_init);
949 module_exit(inet_diag_exit);
950 MODULE_LICENSE("GPL");
951 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);
linux-next