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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / ipv4 / inet_diag.c
blobe5fa2ddce320adafac68cdbf19bfefdae534cf2c
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 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)
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 unsigned char *bc = bytecode;
451 int len = bytecode_len;
452
453 while (len > 0) {
454 struct inet_diag_bc_op *op = (struct inet_diag_bc_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 if (op->yes < 4 || op->yes > len + 4)
466 return -EINVAL;
467 case INET_DIAG_BC_JMP:
468 if (op->no < 4 || op->no > len + 4)
469 return -EINVAL;
470 if (op->no < len &&
471 !valid_cc(bytecode, bytecode_len, len - op->no))
472 return -EINVAL;
473 break;
474 case INET_DIAG_BC_NOP:
475 if (op->yes < 4 || op->yes > len + 4)
476 return -EINVAL;
477 break;
478 default:
479 return -EINVAL;
480 }
481 bc += op->yes;
482 len -= op->yes;
483 }
484 return len == 0 ? 0 : -EINVAL;
485 }
486
487 static int inet_csk_diag_dump(struct sock *sk,
488 struct sk_buff *skb,
489 struct netlink_callback *cb)
490 {
491 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
492
493 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
494 struct inet_diag_entry entry;
495 struct rtattr *bc = (struct rtattr *)(r + 1);
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(RTA_DATA(bc), RTA_PAYLOAD(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 (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
531 struct inet_diag_entry entry;
532 struct rtattr *bc = (struct rtattr *)(r + 1);
533
534 entry.family = tw->tw_family;
535 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
536 if (tw->tw_family == AF_INET6) {
537 struct inet6_timewait_sock *tw6 =
538 inet6_twsk((struct sock *)tw);
539 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
540 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
541 } else
542 #endif
543 {
544 entry.saddr = &tw->tw_rcv_saddr;
545 entry.daddr = &tw->tw_daddr;
546 }
547 entry.sport = tw->tw_num;
548 entry.dport = ntohs(tw->tw_dport);
549 entry.userlocks = 0;
550
551 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
552 return 0;
553 }
554
555 return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
556 NETLINK_CB(cb->skb).pid,
557 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
558 }
559
560 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
561 struct request_sock *req, u32 pid, u32 seq,
562 const struct nlmsghdr *unlh)
563 {
564 const struct inet_request_sock *ireq = inet_rsk(req);
565 struct inet_sock *inet = inet_sk(sk);
566 unsigned char *b = skb_tail_pointer(skb);
567 struct inet_diag_msg *r;
568 struct nlmsghdr *nlh;
569 long tmo;
570
571 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
572 nlh->nlmsg_flags = NLM_F_MULTI;
573 r = NLMSG_DATA(nlh);
574
575 r->idiag_family = sk->sk_family;
576 r->idiag_state = TCP_SYN_RECV;
577 r->idiag_timer = 1;
578 r->idiag_retrans = req->retrans;
579
580 r->id.idiag_if = sk->sk_bound_dev_if;
581 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
582 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
583
584 tmo = req->expires - jiffies;
585 if (tmo < 0)
586 tmo = 0;
587
588 r->id.idiag_sport = inet->inet_sport;
589 r->id.idiag_dport = ireq->rmt_port;
590 r->id.idiag_src[0] = ireq->loc_addr;
591 r->id.idiag_dst[0] = ireq->rmt_addr;
592 r->idiag_expires = jiffies_to_msecs(tmo);
593 r->idiag_rqueue = 0;
594 r->idiag_wqueue = 0;
595 r->idiag_uid = sock_i_uid(sk);
596 r->idiag_inode = 0;
597 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
598 if (r->idiag_family == AF_INET6) {
599 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
600 &inet6_rsk(req)->loc_addr);
601 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
602 &inet6_rsk(req)->rmt_addr);
603 }
604 #endif
605 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
606
607 return skb->len;
608
609 nlmsg_failure:
610 nlmsg_trim(skb, b);
611 return -1;
612 }
613
614 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
615 struct netlink_callback *cb)
616 {
617 struct inet_diag_entry entry;
618 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
619 struct inet_connection_sock *icsk = inet_csk(sk);
620 struct listen_sock *lopt;
621 struct rtattr *bc = NULL;
622 struct inet_sock *inet = inet_sk(sk);
623 int j, s_j;
624 int reqnum, s_reqnum;
625 int err = 0;
626
627 s_j = cb->args[3];
628 s_reqnum = cb->args[4];
629
630 if (s_j > 0)
631 s_j--;
632
633 entry.family = sk->sk_family;
634
635 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
636
637 lopt = icsk->icsk_accept_queue.listen_opt;
638 if (!lopt || !lopt->qlen)
639 goto out;
640
641 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
642 bc = (struct rtattr *)(r + 1);
643 entry.sport = inet->inet_num;
644 entry.userlocks = sk->sk_userlocks;
645 }
646
647 for (j = s_j; j < lopt->nr_table_entries; j++) {
648 struct request_sock *req, *head = lopt->syn_table[j];
649
650 reqnum = 0;
651 for (req = head; req; reqnum++, req = req->dl_next) {
652 struct inet_request_sock *ireq = inet_rsk(req);
653
654 if (reqnum < s_reqnum)
655 continue;
656 if (r->id.idiag_dport != ireq->rmt_port &&
657 r->id.idiag_dport)
658 continue;
659
660 if (bc) {
661 entry.saddr =
662 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
663 (entry.family == AF_INET6) ?
664 inet6_rsk(req)->loc_addr.s6_addr32 :
665 #endif
666 &ireq->loc_addr;
667 entry.daddr =
668 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
669 (entry.family == AF_INET6) ?
670 inet6_rsk(req)->rmt_addr.s6_addr32 :
671 #endif
672 &ireq->rmt_addr;
673 entry.dport = ntohs(ireq->rmt_port);
674
675 if (!inet_diag_bc_run(RTA_DATA(bc),
676 RTA_PAYLOAD(bc), &entry))
677 continue;
678 }
679
680 err = inet_diag_fill_req(skb, sk, req,
681 NETLINK_CB(cb->skb).pid,
682 cb->nlh->nlmsg_seq, cb->nlh);
683 if (err < 0) {
684 cb->args[3] = j + 1;
685 cb->args[4] = reqnum;
686 goto out;
687 }
688 }
689
690 s_reqnum = 0;
691 }
692
693 out:
694 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
695
696 return err;
697 }
698
699 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
700 {
701 int i, num;
702 int s_i, s_num;
703 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
704 const struct inet_diag_handler *handler;
705 struct inet_hashinfo *hashinfo;
706
707 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
708 if (IS_ERR(handler))
709 goto unlock;
710
711 hashinfo = handler->idiag_hashinfo;
712
713 s_i = cb->args[1];
714 s_num = num = cb->args[2];
715
716 if (cb->args[0] == 0) {
717 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
718 goto skip_listen_ht;
719
720 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
721 struct sock *sk;
722 struct hlist_nulls_node *node;
723 struct inet_listen_hashbucket *ilb;
724
725 num = 0;
726 ilb = &hashinfo->listening_hash[i];
727 spin_lock_bh(&ilb->lock);
728 sk_nulls_for_each(sk, node, &ilb->head) {
729 struct inet_sock *inet = inet_sk(sk);
730
731 if (num < s_num) {
732 num++;
733 continue;
734 }
735
736 if (r->id.idiag_sport != inet->inet_sport &&
737 r->id.idiag_sport)
738 goto next_listen;
739
740 if (!(r->idiag_states & TCPF_LISTEN) ||
741 r->id.idiag_dport ||
742 cb->args[3] > 0)
743 goto syn_recv;
744
745 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
746 spin_unlock_bh(&ilb->lock);
747 goto done;
748 }
749
750 syn_recv:
751 if (!(r->idiag_states & TCPF_SYN_RECV))
752 goto next_listen;
753
754 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
755 spin_unlock_bh(&ilb->lock);
756 goto done;
757 }
758
759 next_listen:
760 cb->args[3] = 0;
761 cb->args[4] = 0;
762 ++num;
763 }
764 spin_unlock_bh(&ilb->lock);
765
766 s_num = 0;
767 cb->args[3] = 0;
768 cb->args[4] = 0;
769 }
770 skip_listen_ht:
771 cb->args[0] = 1;
772 s_i = num = s_num = 0;
773 }
774
775 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
776 goto unlock;
777
778 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
779 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
780 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
781 struct sock *sk;
782 struct hlist_nulls_node *node;
783
784 num = 0;
785
786 if (hlist_nulls_empty(&head->chain) &&
787 hlist_nulls_empty(&head->twchain))
788 continue;
789
790 if (i > s_i)
791 s_num = 0;
792
793 spin_lock_bh(lock);
794 sk_nulls_for_each(sk, node, &head->chain) {
795 struct inet_sock *inet = inet_sk(sk);
796
797 if (num < s_num)
798 goto next_normal;
799 if (!(r->idiag_states & (1 << sk->sk_state)))
800 goto next_normal;
801 if (r->id.idiag_sport != inet->inet_sport &&
802 r->id.idiag_sport)
803 goto next_normal;
804 if (r->id.idiag_dport != inet->inet_dport &&
805 r->id.idiag_dport)
806 goto next_normal;
807 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
808 spin_unlock_bh(lock);
809 goto done;
810 }
811 next_normal:
812 ++num;
813 }
814
815 if (r->idiag_states & TCPF_TIME_WAIT) {
816 struct inet_timewait_sock *tw;
817
818 inet_twsk_for_each(tw, node,
819 &head->twchain) {
820
821 if (num < s_num)
822 goto next_dying;
823 if (r->id.idiag_sport != tw->tw_sport &&
824 r->id.idiag_sport)
825 goto next_dying;
826 if (r->id.idiag_dport != tw->tw_dport &&
827 r->id.idiag_dport)
828 goto next_dying;
829 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
830 spin_unlock_bh(lock);
831 goto done;
832 }
833 next_dying:
834 ++num;
835 }
836 }
837 spin_unlock_bh(lock);
838 }
839
840 done:
841 cb->args[1] = i;
842 cb->args[2] = num;
843 unlock:
844 inet_diag_unlock_handler(handler);
845 return skb->len;
846 }
847
848 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
849 {
850 int hdrlen = sizeof(struct inet_diag_req);
851
852 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
853 nlmsg_len(nlh) < hdrlen)
854 return -EINVAL;
855
856 if (nlh->nlmsg_flags & NLM_F_DUMP) {
857 if (nlmsg_attrlen(nlh, hdrlen)) {
858 struct nlattr *attr;
859
860 attr = nlmsg_find_attr(nlh, hdrlen,
861 INET_DIAG_REQ_BYTECODE);
862 if (attr == NULL ||
863 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
864 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
865 return -EINVAL;
866 }
867
868 return netlink_dump_start(idiagnl, skb, nlh,
869 inet_diag_dump, NULL);
870 }
871
872 return inet_diag_get_exact(skb, nlh);
873 }
874
875 static DEFINE_MUTEX(inet_diag_mutex);
876
877 static void inet_diag_rcv(struct sk_buff *skb)
878 {
879 mutex_lock(&inet_diag_mutex);
880 netlink_rcv_skb(skb, &inet_diag_rcv_msg);
881 mutex_unlock(&inet_diag_mutex);
882 }
883
884 int inet_diag_register(const struct inet_diag_handler *h)
885 {
886 const __u16 type = h->idiag_type;
887 int err = -EINVAL;
888
889 if (type >= INET_DIAG_GETSOCK_MAX)
890 goto out;
891
892 mutex_lock(&inet_diag_table_mutex);
893 err = -EEXIST;
894 if (inet_diag_table[type] == NULL) {
895 inet_diag_table[type] = h;
896 err = 0;
897 }
898 mutex_unlock(&inet_diag_table_mutex);
899 out:
900 return err;
901 }
902 EXPORT_SYMBOL_GPL(inet_diag_register);
903
904 void inet_diag_unregister(const struct inet_diag_handler *h)
905 {
906 const __u16 type = h->idiag_type;
907
908 if (type >= INET_DIAG_GETSOCK_MAX)
909 return;
910
911 mutex_lock(&inet_diag_table_mutex);
912 inet_diag_table[type] = NULL;
913 mutex_unlock(&inet_diag_table_mutex);
914 }
915 EXPORT_SYMBOL_GPL(inet_diag_unregister);
916
917 static int __init inet_diag_init(void)
918 {
919 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
920 sizeof(struct inet_diag_handler *));
921 int err = -ENOMEM;
922
923 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
924 if (!inet_diag_table)
925 goto out;
926
927 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
928 inet_diag_rcv, NULL, THIS_MODULE);
929 if (idiagnl == NULL)
930 goto out_free_table;
931 err = 0;
932 out:
933 return err;
934 out_free_table:
935 kfree(inet_diag_table);
936 goto out;
937 }
938
939 static void __exit inet_diag_exit(void)
940 {
941 netlink_kernel_release(idiagnl);
942 kfree(inet_diag_table);
943 }
944
945 module_init(inet_diag_init);
946 module_exit(inet_diag_exit);
947 MODULE_LICENSE("GPL");
948 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);
linux-next