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Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
[linux-2.6/lfs.git] / net / ipv4 / inet_diag.c
blobda97695e70963917f98d38cf426caefc6072c069
1 /*
2 * inet_diag.c Module for monitoring INET transport protocols sockets.
3 *
4 * Version: $Id: inet_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $
5 *
6 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <linux/fcntl.h>
18 #include <linux/random.h>
19 #include <linux/cache.h>
20 #include <linux/init.h>
21 #include <linux/time.h>
22
23 #include <net/icmp.h>
24 #include <net/tcp.h>
25 #include <net/ipv6.h>
26 #include <net/inet_common.h>
27 #include <net/inet_connection_sock.h>
28 #include <net/inet_hashtables.h>
29 #include <net/inet_timewait_sock.h>
30 #include <net/inet6_hashtables.h>
31 #include <net/netlink.h>
32
33 #include <linux/inet.h>
34 #include <linux/stddef.h>
35
36 #include <linux/inet_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 };
48
49 static struct sock *idiagnl;
50
51 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
52 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
53
54 static DEFINE_MUTEX(inet_diag_table_mutex);
55
56 static const struct inet_diag_handler *inet_diag_lock_handler(int type)
57 {
58 #ifdef CONFIG_KMOD
59 if (!inet_diag_table[type])
60 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
61 NETLINK_INET_DIAG, type);
62 #endif
63
64 mutex_lock(&inet_diag_table_mutex);
65 if (!inet_diag_table[type])
66 return ERR_PTR(-ENOENT);
67
68 return inet_diag_table[type];
69 }
70
71 static inline void inet_diag_unlock_handler(
72 const struct inet_diag_handler *handler)
73 {
74 mutex_unlock(&inet_diag_table_mutex);
75 }
76
77 static int inet_csk_diag_fill(struct sock *sk,
78 struct sk_buff *skb,
79 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
80 const struct nlmsghdr *unlh)
81 {
82 const struct inet_sock *inet = inet_sk(sk);
83 const struct inet_connection_sock *icsk = inet_csk(sk);
84 struct inet_diag_msg *r;
85 struct nlmsghdr *nlh;
86 void *info = NULL;
87 struct inet_diag_meminfo *minfo = NULL;
88 unsigned char *b = skb_tail_pointer(skb);
89 const struct inet_diag_handler *handler;
90
91 handler = inet_diag_table[unlh->nlmsg_type];
92 BUG_ON(handler == NULL);
93
94 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
95 nlh->nlmsg_flags = nlmsg_flags;
96
97 r = NLMSG_DATA(nlh);
98 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
99
100 if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
101 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
102
103 if (ext & (1 << (INET_DIAG_INFO - 1)))
104 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
105 handler->idiag_info_size);
106
107 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
108 const size_t len = strlen(icsk->icsk_ca_ops->name);
109
110 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
111 icsk->icsk_ca_ops->name);
112 }
113
114 r->idiag_family = sk->sk_family;
115 r->idiag_state = sk->sk_state;
116 r->idiag_timer = 0;
117 r->idiag_retrans = 0;
118
119 r->id.idiag_if = sk->sk_bound_dev_if;
120 r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
121 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
122
123 r->id.idiag_sport = inet->sport;
124 r->id.idiag_dport = inet->dport;
125 r->id.idiag_src[0] = inet->rcv_saddr;
126 r->id.idiag_dst[0] = inet->daddr;
127
128 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
129 if (r->idiag_family == AF_INET6) {
130 struct ipv6_pinfo *np = inet6_sk(sk);
131
132 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
133 &np->rcv_saddr);
134 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
135 &np->daddr);
136 }
137 #endif
138
139 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
140
141 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
142 r->idiag_timer = 1;
143 r->idiag_retrans = icsk->icsk_retransmits;
144 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
145 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
146 r->idiag_timer = 4;
147 r->idiag_retrans = icsk->icsk_probes_out;
148 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
149 } else if (timer_pending(&sk->sk_timer)) {
150 r->idiag_timer = 2;
151 r->idiag_retrans = icsk->icsk_probes_out;
152 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
153 } else {
154 r->idiag_timer = 0;
155 r->idiag_expires = 0;
156 }
157 #undef EXPIRES_IN_MS
158
159 r->idiag_uid = sock_i_uid(sk);
160 r->idiag_inode = sock_i_ino(sk);
161
162 if (minfo) {
163 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
164 minfo->idiag_wmem = sk->sk_wmem_queued;
165 minfo->idiag_fmem = sk->sk_forward_alloc;
166 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
167 }
168
169 handler->idiag_get_info(sk, r, info);
170
171 if (sk->sk_state < TCP_TIME_WAIT &&
172 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
173 icsk->icsk_ca_ops->get_info(sk, ext, skb);
174
175 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
176 return skb->len;
177
178 rtattr_failure:
179 nlmsg_failure:
180 nlmsg_trim(skb, b);
181 return -EMSGSIZE;
182 }
183
184 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
185 struct sk_buff *skb, int ext, u32 pid,
186 u32 seq, u16 nlmsg_flags,
187 const struct nlmsghdr *unlh)
188 {
189 long tmo;
190 struct inet_diag_msg *r;
191 const unsigned char *previous_tail = skb_tail_pointer(skb);
192 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
193 unlh->nlmsg_type, sizeof(*r));
194
195 r = NLMSG_DATA(nlh);
196 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
197
198 nlh->nlmsg_flags = nlmsg_flags;
199
200 tmo = tw->tw_ttd - jiffies;
201 if (tmo < 0)
202 tmo = 0;
203
204 r->idiag_family = tw->tw_family;
205 r->idiag_state = tw->tw_state;
206 r->idiag_timer = 0;
207 r->idiag_retrans = 0;
208 r->id.idiag_if = tw->tw_bound_dev_if;
209 r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
210 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
211 r->id.idiag_sport = tw->tw_sport;
212 r->id.idiag_dport = tw->tw_dport;
213 r->id.idiag_src[0] = tw->tw_rcv_saddr;
214 r->id.idiag_dst[0] = tw->tw_daddr;
215 r->idiag_state = tw->tw_substate;
216 r->idiag_timer = 3;
217 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
218 r->idiag_rqueue = 0;
219 r->idiag_wqueue = 0;
220 r->idiag_uid = 0;
221 r->idiag_inode = 0;
222 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
223 if (tw->tw_family == AF_INET6) {
224 const struct inet6_timewait_sock *tw6 =
225 inet6_twsk((struct sock *)tw);
226
227 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
228 &tw6->tw_v6_rcv_saddr);
229 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
230 &tw6->tw_v6_daddr);
231 }
232 #endif
233 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
234 return skb->len;
235 nlmsg_failure:
236 nlmsg_trim(skb, previous_tail);
237 return -EMSGSIZE;
238 }
239
240 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
241 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
242 const struct nlmsghdr *unlh)
243 {
244 if (sk->sk_state == TCP_TIME_WAIT)
245 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
246 skb, ext, pid, seq, nlmsg_flags,
247 unlh);
248 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
249 }
250
251 static int inet_diag_get_exact(struct sk_buff *in_skb,
252 const struct nlmsghdr *nlh)
253 {
254 int err;
255 struct sock *sk;
256 struct inet_diag_req *req = NLMSG_DATA(nlh);
257 struct sk_buff *rep;
258 struct inet_hashinfo *hashinfo;
259 const struct inet_diag_handler *handler;
260
261 handler = inet_diag_lock_handler(nlh->nlmsg_type);
262 if (IS_ERR(handler)) {
263 err = PTR_ERR(handler);
264 goto unlock;
265 }
266
267 hashinfo = handler->idiag_hashinfo;
268 err = -EINVAL;
269
270 if (req->idiag_family == AF_INET) {
271 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
272 req->id.idiag_dport, req->id.idiag_src[0],
273 req->id.idiag_sport, req->id.idiag_if);
274 }
275 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
276 else if (req->idiag_family == AF_INET6) {
277 sk = inet6_lookup(&init_net, hashinfo,
278 (struct in6_addr *)req->id.idiag_dst,
279 req->id.idiag_dport,
280 (struct in6_addr *)req->id.idiag_src,
281 req->id.idiag_sport,
282 req->id.idiag_if);
283 }
284 #endif
285 else {
286 goto unlock;
287 }
288
289 err = -ENOENT;
290 if (sk == NULL)
291 goto unlock;
292
293 err = -ESTALE;
294 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
295 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
296 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
297 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
298 goto out;
299
300 err = -ENOMEM;
301 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
302 sizeof(struct inet_diag_meminfo) +
303 handler->idiag_info_size + 64)),
304 GFP_KERNEL);
305 if (!rep)
306 goto out;
307
308 err = sk_diag_fill(sk, rep, req->idiag_ext,
309 NETLINK_CB(in_skb).pid,
310 nlh->nlmsg_seq, 0, nlh);
311 if (err < 0) {
312 WARN_ON(err == -EMSGSIZE);
313 kfree_skb(rep);
314 goto out;
315 }
316 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
317 MSG_DONTWAIT);
318 if (err > 0)
319 err = 0;
320
321 out:
322 if (sk) {
323 if (sk->sk_state == TCP_TIME_WAIT)
324 inet_twsk_put((struct inet_timewait_sock *)sk);
325 else
326 sock_put(sk);
327 }
328 unlock:
329 inet_diag_unlock_handler(handler);
330 return err;
331 }
332
333 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
334 {
335 int words = bits >> 5;
336
337 bits &= 0x1f;
338
339 if (words) {
340 if (memcmp(a1, a2, words << 2))
341 return 0;
342 }
343 if (bits) {
344 __be32 w1, w2;
345 __be32 mask;
346
347 w1 = a1[words];
348 w2 = a2[words];
349
350 mask = htonl((0xffffffff) << (32 - bits));
351
352 if ((w1 ^ w2) & mask)
353 return 0;
354 }
355
356 return 1;
357 }
358
359
360 static int inet_diag_bc_run(const void *bc, int len,
361 const struct inet_diag_entry *entry)
362 {
363 while (len > 0) {
364 int yes = 1;
365 const struct inet_diag_bc_op *op = bc;
366
367 switch (op->code) {
368 case INET_DIAG_BC_NOP:
369 break;
370 case INET_DIAG_BC_JMP:
371 yes = 0;
372 break;
373 case INET_DIAG_BC_S_GE:
374 yes = entry->sport >= op[1].no;
375 break;
376 case INET_DIAG_BC_S_LE:
377 yes = entry->dport <= op[1].no;
378 break;
379 case INET_DIAG_BC_D_GE:
380 yes = entry->dport >= op[1].no;
381 break;
382 case INET_DIAG_BC_D_LE:
383 yes = entry->dport <= op[1].no;
384 break;
385 case INET_DIAG_BC_AUTO:
386 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
387 break;
388 case INET_DIAG_BC_S_COND:
389 case INET_DIAG_BC_D_COND: {
390 struct inet_diag_hostcond *cond;
391 __be32 *addr;
392
393 cond = (struct inet_diag_hostcond *)(op + 1);
394 if (cond->port != -1 &&
395 cond->port != (op->code == INET_DIAG_BC_S_COND ?
396 entry->sport : entry->dport)) {
397 yes = 0;
398 break;
399 }
400
401 if (cond->prefix_len == 0)
402 break;
403
404 if (op->code == INET_DIAG_BC_S_COND)
405 addr = entry->saddr;
406 else
407 addr = entry->daddr;
408
409 if (bitstring_match(addr, cond->addr,
410 cond->prefix_len))
411 break;
412 if (entry->family == AF_INET6 &&
413 cond->family == AF_INET) {
414 if (addr[0] == 0 && addr[1] == 0 &&
415 addr[2] == htonl(0xffff) &&
416 bitstring_match(addr + 3, cond->addr,
417 cond->prefix_len))
418 break;
419 }
420 yes = 0;
421 break;
422 }
423 }
424
425 if (yes) {
426 len -= op->yes;
427 bc += op->yes;
428 } else {
429 len -= op->no;
430 bc += op->no;
431 }
432 }
433 return (len == 0);
434 }
435
436 static int valid_cc(const void *bc, int len, int cc)
437 {
438 while (len >= 0) {
439 const struct inet_diag_bc_op *op = bc;
440
441 if (cc > len)
442 return 0;
443 if (cc == len)
444 return 1;
445 if (op->yes < 4)
446 return 0;
447 len -= op->yes;
448 bc += op->yes;
449 }
450 return 0;
451 }
452
453 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
454 {
455 const unsigned char *bc = bytecode;
456 int len = bytecode_len;
457
458 while (len > 0) {
459 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
460
461 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
462 switch (op->code) {
463 case INET_DIAG_BC_AUTO:
464 case INET_DIAG_BC_S_COND:
465 case INET_DIAG_BC_D_COND:
466 case INET_DIAG_BC_S_GE:
467 case INET_DIAG_BC_S_LE:
468 case INET_DIAG_BC_D_GE:
469 case INET_DIAG_BC_D_LE:
470 if (op->yes < 4 || op->yes > len + 4)
471 return -EINVAL;
472 case INET_DIAG_BC_JMP:
473 if (op->no < 4 || op->no > len + 4)
474 return -EINVAL;
475 if (op->no < len &&
476 !valid_cc(bytecode, bytecode_len, len - op->no))
477 return -EINVAL;
478 break;
479 case INET_DIAG_BC_NOP:
480 if (op->yes < 4 || op->yes > len + 4)
481 return -EINVAL;
482 break;
483 default:
484 return -EINVAL;
485 }
486 bc += op->yes;
487 len -= op->yes;
488 }
489 return len == 0 ? 0 : -EINVAL;
490 }
491
492 static int inet_csk_diag_dump(struct sock *sk,
493 struct sk_buff *skb,
494 struct netlink_callback *cb)
495 {
496 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
497
498 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
499 struct inet_diag_entry entry;
500 struct rtattr *bc = (struct rtattr *)(r + 1);
501 struct inet_sock *inet = inet_sk(sk);
502
503 entry.family = sk->sk_family;
504 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
505 if (entry.family == AF_INET6) {
506 struct ipv6_pinfo *np = inet6_sk(sk);
507
508 entry.saddr = np->rcv_saddr.s6_addr32;
509 entry.daddr = np->daddr.s6_addr32;
510 } else
511 #endif
512 {
513 entry.saddr = &inet->rcv_saddr;
514 entry.daddr = &inet->daddr;
515 }
516 entry.sport = inet->num;
517 entry.dport = ntohs(inet->dport);
518 entry.userlocks = sk->sk_userlocks;
519
520 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
521 return 0;
522 }
523
524 return inet_csk_diag_fill(sk, skb, r->idiag_ext,
525 NETLINK_CB(cb->skb).pid,
526 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
527 }
528
529 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
530 struct sk_buff *skb,
531 struct netlink_callback *cb)
532 {
533 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
534
535 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
536 struct inet_diag_entry entry;
537 struct rtattr *bc = (struct rtattr *)(r + 1);
538
539 entry.family = tw->tw_family;
540 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
541 if (tw->tw_family == AF_INET6) {
542 struct inet6_timewait_sock *tw6 =
543 inet6_twsk((struct sock *)tw);
544 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
545 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
546 } else
547 #endif
548 {
549 entry.saddr = &tw->tw_rcv_saddr;
550 entry.daddr = &tw->tw_daddr;
551 }
552 entry.sport = tw->tw_num;
553 entry.dport = ntohs(tw->tw_dport);
554 entry.userlocks = 0;
555
556 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
557 return 0;
558 }
559
560 return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
561 NETLINK_CB(cb->skb).pid,
562 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
563 }
564
565 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
566 struct request_sock *req, u32 pid, u32 seq,
567 const struct nlmsghdr *unlh)
568 {
569 const struct inet_request_sock *ireq = inet_rsk(req);
570 struct inet_sock *inet = inet_sk(sk);
571 unsigned char *b = skb_tail_pointer(skb);
572 struct inet_diag_msg *r;
573 struct nlmsghdr *nlh;
574 long tmo;
575
576 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
577 nlh->nlmsg_flags = NLM_F_MULTI;
578 r = NLMSG_DATA(nlh);
579
580 r->idiag_family = sk->sk_family;
581 r->idiag_state = TCP_SYN_RECV;
582 r->idiag_timer = 1;
583 r->idiag_retrans = req->retrans;
584
585 r->id.idiag_if = sk->sk_bound_dev_if;
586 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
587 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
588
589 tmo = req->expires - jiffies;
590 if (tmo < 0)
591 tmo = 0;
592
593 r->id.idiag_sport = inet->sport;
594 r->id.idiag_dport = ireq->rmt_port;
595 r->id.idiag_src[0] = ireq->loc_addr;
596 r->id.idiag_dst[0] = ireq->rmt_addr;
597 r->idiag_expires = jiffies_to_msecs(tmo);
598 r->idiag_rqueue = 0;
599 r->idiag_wqueue = 0;
600 r->idiag_uid = sock_i_uid(sk);
601 r->idiag_inode = 0;
602 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
603 if (r->idiag_family == AF_INET6) {
604 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
605 &inet6_rsk(req)->loc_addr);
606 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
607 &inet6_rsk(req)->rmt_addr);
608 }
609 #endif
610 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
611
612 return skb->len;
613
614 nlmsg_failure:
615 nlmsg_trim(skb, b);
616 return -1;
617 }
618
619 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
620 struct netlink_callback *cb)
621 {
622 struct inet_diag_entry entry;
623 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
624 struct inet_connection_sock *icsk = inet_csk(sk);
625 struct listen_sock *lopt;
626 struct rtattr *bc = NULL;
627 struct inet_sock *inet = inet_sk(sk);
628 int j, s_j;
629 int reqnum, s_reqnum;
630 int err = 0;
631
632 s_j = cb->args[3];
633 s_reqnum = cb->args[4];
634
635 if (s_j > 0)
636 s_j--;
637
638 entry.family = sk->sk_family;
639
640 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
641
642 lopt = icsk->icsk_accept_queue.listen_opt;
643 if (!lopt || !lopt->qlen)
644 goto out;
645
646 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
647 bc = (struct rtattr *)(r + 1);
648 entry.sport = inet->num;
649 entry.userlocks = sk->sk_userlocks;
650 }
651
652 for (j = s_j; j < lopt->nr_table_entries; j++) {
653 struct request_sock *req, *head = lopt->syn_table[j];
654
655 reqnum = 0;
656 for (req = head; req; reqnum++, req = req->dl_next) {
657 struct inet_request_sock *ireq = inet_rsk(req);
658
659 if (reqnum < s_reqnum)
660 continue;
661 if (r->id.idiag_dport != ireq->rmt_port &&
662 r->id.idiag_dport)
663 continue;
664
665 if (bc) {
666 entry.saddr =
667 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
668 (entry.family == AF_INET6) ?
669 inet6_rsk(req)->loc_addr.s6_addr32 :
670 #endif
671 &ireq->loc_addr;
672 entry.daddr =
673 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
674 (entry.family == AF_INET6) ?
675 inet6_rsk(req)->rmt_addr.s6_addr32 :
676 #endif
677 &ireq->rmt_addr;
678 entry.dport = ntohs(ireq->rmt_port);
679
680 if (!inet_diag_bc_run(RTA_DATA(bc),
681 RTA_PAYLOAD(bc), &entry))
682 continue;
683 }
684
685 err = inet_diag_fill_req(skb, sk, req,
686 NETLINK_CB(cb->skb).pid,
687 cb->nlh->nlmsg_seq, cb->nlh);
688 if (err < 0) {
689 cb->args[3] = j + 1;
690 cb->args[4] = reqnum;
691 goto out;
692 }
693 }
694
695 s_reqnum = 0;
696 }
697
698 out:
699 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
700
701 return err;
702 }
703
704 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
705 {
706 int i, num;
707 int s_i, s_num;
708 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
709 const struct inet_diag_handler *handler;
710 struct inet_hashinfo *hashinfo;
711
712 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
713 if (IS_ERR(handler))
714 goto unlock;
715
716 hashinfo = handler->idiag_hashinfo;
717
718 s_i = cb->args[1];
719 s_num = num = cb->args[2];
720
721 if (cb->args[0] == 0) {
722 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
723 goto skip_listen_ht;
724
725 inet_listen_lock(hashinfo);
726 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
727 struct sock *sk;
728 struct hlist_node *node;
729
730 num = 0;
731 sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
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->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 inet_listen_unlock(hashinfo);
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 inet_listen_unlock(hashinfo);
759 goto done;
760 }
761
762 next_listen:
763 cb->args[3] = 0;
764 cb->args[4] = 0;
765 ++num;
766 }
767
768 s_num = 0;
769 cb->args[3] = 0;
770 cb->args[4] = 0;
771 }
772 inet_listen_unlock(hashinfo);
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_size; i++) {
782 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
783 rwlock_t *lock = inet_ehash_lockp(hashinfo, i);
784 struct sock *sk;
785 struct hlist_node *node;
786
787 if (i > s_i)
788 s_num = 0;
789
790 read_lock_bh(lock);
791 num = 0;
792 sk_for_each(sk, node, &head->chain) {
793 struct inet_sock *inet = inet_sk(sk);
794
795 if (num < s_num)
796 goto next_normal;
797 if (!(r->idiag_states & (1 << sk->sk_state)))
798 goto next_normal;
799 if (r->id.idiag_sport != inet->sport &&
800 r->id.idiag_sport)
801 goto next_normal;
802 if (r->id.idiag_dport != inet->dport &&
803 r->id.idiag_dport)
804 goto next_normal;
805 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
806 read_unlock_bh(lock);
807 goto done;
808 }
809 next_normal:
810 ++num;
811 }
812
813 if (r->idiag_states & TCPF_TIME_WAIT) {
814 struct inet_timewait_sock *tw;
815
816 inet_twsk_for_each(tw, node,
817 &head->twchain) {
818
819 if (num < s_num)
820 goto next_dying;
821 if (r->id.idiag_sport != tw->tw_sport &&
822 r->id.idiag_sport)
823 goto next_dying;
824 if (r->id.idiag_dport != tw->tw_dport &&
825 r->id.idiag_dport)
826 goto next_dying;
827 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
828 read_unlock_bh(lock);
829 goto done;
830 }
831 next_dying:
832 ++num;
833 }
834 }
835 read_unlock_bh(lock);
836 }
837
838 done:
839 cb->args[1] = i;
840 cb->args[2] = num;
841 unlock:
842 inet_diag_unlock_handler(handler);
843 return skb->len;
844 }
845
846 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
847 {
848 int hdrlen = sizeof(struct inet_diag_req);
849
850 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
851 nlmsg_len(nlh) < hdrlen)
852 return -EINVAL;
853
854 if (nlh->nlmsg_flags & NLM_F_DUMP) {
855 if (nlmsg_attrlen(nlh, hdrlen)) {
856 struct nlattr *attr;
857
858 attr = nlmsg_find_attr(nlh, hdrlen,
859 INET_DIAG_REQ_BYTECODE);
860 if (attr == NULL ||
861 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
862 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
863 return -EINVAL;
864 }
865
866 return netlink_dump_start(idiagnl, skb, nlh,
867 inet_diag_dump, NULL);
868 }
869
870 return inet_diag_get_exact(skb, nlh);
871 }
872
873 static DEFINE_MUTEX(inet_diag_mutex);
874
875 static void inet_diag_rcv(struct sk_buff *skb)
876 {
877 mutex_lock(&inet_diag_mutex);
878 netlink_rcv_skb(skb, &inet_diag_rcv_msg);
879 mutex_unlock(&inet_diag_mutex);
880 }
881
882 int inet_diag_register(const struct inet_diag_handler *h)
883 {
884 const __u16 type = h->idiag_type;
885 int err = -EINVAL;
886
887 if (type >= INET_DIAG_GETSOCK_MAX)
888 goto out;
889
890 mutex_lock(&inet_diag_table_mutex);
891 err = -EEXIST;
892 if (inet_diag_table[type] == NULL) {
893 inet_diag_table[type] = h;
894 err = 0;
895 }
896 mutex_unlock(&inet_diag_table_mutex);
897 out:
898 return err;
899 }
900 EXPORT_SYMBOL_GPL(inet_diag_register);
901
902 void inet_diag_unregister(const struct inet_diag_handler *h)
903 {
904 const __u16 type = h->idiag_type;
905
906 if (type >= INET_DIAG_GETSOCK_MAX)
907 return;
908
909 mutex_lock(&inet_diag_table_mutex);
910 inet_diag_table[type] = NULL;
911 mutex_unlock(&inet_diag_table_mutex);
912 }
913 EXPORT_SYMBOL_GPL(inet_diag_unregister);
914
915 static int __init inet_diag_init(void)
916 {
917 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
918 sizeof(struct inet_diag_handler *));
919 int err = -ENOMEM;
920
921 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
922 if (!inet_diag_table)
923 goto out;
924
925 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
926 inet_diag_rcv, NULL, THIS_MODULE);
927 if (idiagnl == NULL)
928 goto out_free_table;
929 err = 0;
930 out:
931 return err;
932 out_free_table:
933 kfree(inet_diag_table);
934 goto out;
935 }
936
937 static void __exit inet_diag_exit(void)
938 {
939 netlink_kernel_release(idiagnl);
940 kfree(inet_diag_table);
941 }
942
943 module_init(inet_diag_init);
944 module_exit(inet_diag_exit);
945 MODULE_LICENSE("GPL");
946 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);
Log-structured file system for Linux