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hugetlb: reserve huge pages for reliable MAP_PRIVATE hugetlbfs mappings until fork()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv4 / inet_diag.c
blobc10036e7a46349130d3a27c16c0a341795581d27
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 #ifdef CONFIG_KMOD
57 if (!inet_diag_table[type])
58 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
59 NETLINK_INET_DIAG, type);
60 #endif
61
62 mutex_lock(&inet_diag_table_mutex);
63 if (!inet_diag_table[type])
64 return ERR_PTR(-ENOENT);
65
66 return inet_diag_table[type];
67 }
68
69 static inline void inet_diag_unlock_handler(
70 const struct inet_diag_handler *handler)
71 {
72 mutex_unlock(&inet_diag_table_mutex);
73 }
74
75 static int inet_csk_diag_fill(struct sock *sk,
76 struct sk_buff *skb,
77 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
78 const struct nlmsghdr *unlh)
79 {
80 const struct inet_sock *inet = inet_sk(sk);
81 const struct inet_connection_sock *icsk = inet_csk(sk);
82 struct inet_diag_msg *r;
83 struct nlmsghdr *nlh;
84 void *info = NULL;
85 struct inet_diag_meminfo *minfo = NULL;
86 unsigned char *b = skb_tail_pointer(skb);
87 const struct inet_diag_handler *handler;
88
89 handler = inet_diag_table[unlh->nlmsg_type];
90 BUG_ON(handler == NULL);
91
92 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
93 nlh->nlmsg_flags = nlmsg_flags;
94
95 r = NLMSG_DATA(nlh);
96 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
97
98 if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
99 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
100
101 if (ext & (1 << (INET_DIAG_INFO - 1)))
102 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
103 handler->idiag_info_size);
104
105 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
106 const size_t len = strlen(icsk->icsk_ca_ops->name);
107
108 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
109 icsk->icsk_ca_ops->name);
110 }
111
112 r->idiag_family = sk->sk_family;
113 r->idiag_state = sk->sk_state;
114 r->idiag_timer = 0;
115 r->idiag_retrans = 0;
116
117 r->id.idiag_if = sk->sk_bound_dev_if;
118 r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
119 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
120
121 r->id.idiag_sport = inet->sport;
122 r->id.idiag_dport = inet->dport;
123 r->id.idiag_src[0] = inet->rcv_saddr;
124 r->id.idiag_dst[0] = inet->daddr;
125
126 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
127 if (r->idiag_family == AF_INET6) {
128 struct ipv6_pinfo *np = inet6_sk(sk);
129
130 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
131 &np->rcv_saddr);
132 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
133 &np->daddr);
134 }
135 #endif
136
137 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
138
139 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
140 r->idiag_timer = 1;
141 r->idiag_retrans = icsk->icsk_retransmits;
142 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
143 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
144 r->idiag_timer = 4;
145 r->idiag_retrans = icsk->icsk_probes_out;
146 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
147 } else if (timer_pending(&sk->sk_timer)) {
148 r->idiag_timer = 2;
149 r->idiag_retrans = icsk->icsk_probes_out;
150 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
151 } else {
152 r->idiag_timer = 0;
153 r->idiag_expires = 0;
154 }
155 #undef EXPIRES_IN_MS
156
157 r->idiag_uid = sock_i_uid(sk);
158 r->idiag_inode = sock_i_ino(sk);
159
160 if (minfo) {
161 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
162 minfo->idiag_wmem = sk->sk_wmem_queued;
163 minfo->idiag_fmem = sk->sk_forward_alloc;
164 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
165 }
166
167 handler->idiag_get_info(sk, r, info);
168
169 if (sk->sk_state < TCP_TIME_WAIT &&
170 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
171 icsk->icsk_ca_ops->get_info(sk, ext, skb);
172
173 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
174 return skb->len;
175
176 rtattr_failure:
177 nlmsg_failure:
178 nlmsg_trim(skb, b);
179 return -EMSGSIZE;
180 }
181
182 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
183 struct sk_buff *skb, int ext, u32 pid,
184 u32 seq, u16 nlmsg_flags,
185 const struct nlmsghdr *unlh)
186 {
187 long tmo;
188 struct inet_diag_msg *r;
189 const unsigned char *previous_tail = skb_tail_pointer(skb);
190 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
191 unlh->nlmsg_type, sizeof(*r));
192
193 r = NLMSG_DATA(nlh);
194 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
195
196 nlh->nlmsg_flags = nlmsg_flags;
197
198 tmo = tw->tw_ttd - jiffies;
199 if (tmo < 0)
200 tmo = 0;
201
202 r->idiag_family = tw->tw_family;
203 r->idiag_state = tw->tw_state;
204 r->idiag_timer = 0;
205 r->idiag_retrans = 0;
206 r->id.idiag_if = tw->tw_bound_dev_if;
207 r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
208 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
209 r->id.idiag_sport = tw->tw_sport;
210 r->id.idiag_dport = tw->tw_dport;
211 r->id.idiag_src[0] = tw->tw_rcv_saddr;
212 r->id.idiag_dst[0] = tw->tw_daddr;
213 r->idiag_state = tw->tw_substate;
214 r->idiag_timer = 3;
215 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
216 r->idiag_rqueue = 0;
217 r->idiag_wqueue = 0;
218 r->idiag_uid = 0;
219 r->idiag_inode = 0;
220 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
221 if (tw->tw_family == AF_INET6) {
222 const struct inet6_timewait_sock *tw6 =
223 inet6_twsk((struct sock *)tw);
224
225 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
226 &tw6->tw_v6_rcv_saddr);
227 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
228 &tw6->tw_v6_daddr);
229 }
230 #endif
231 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
232 return skb->len;
233 nlmsg_failure:
234 nlmsg_trim(skb, previous_tail);
235 return -EMSGSIZE;
236 }
237
238 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
239 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
240 const struct nlmsghdr *unlh)
241 {
242 if (sk->sk_state == TCP_TIME_WAIT)
243 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
244 skb, ext, pid, seq, nlmsg_flags,
245 unlh);
246 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
247 }
248
249 static int inet_diag_get_exact(struct sk_buff *in_skb,
250 const struct nlmsghdr *nlh)
251 {
252 int err;
253 struct sock *sk;
254 struct inet_diag_req *req = NLMSG_DATA(nlh);
255 struct sk_buff *rep;
256 struct inet_hashinfo *hashinfo;
257 const struct inet_diag_handler *handler;
258
259 handler = inet_diag_lock_handler(nlh->nlmsg_type);
260 if (IS_ERR(handler)) {
261 err = PTR_ERR(handler);
262 goto unlock;
263 }
264
265 hashinfo = handler->idiag_hashinfo;
266 err = -EINVAL;
267
268 if (req->idiag_family == AF_INET) {
269 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
270 req->id.idiag_dport, req->id.idiag_src[0],
271 req->id.idiag_sport, req->id.idiag_if);
272 }
273 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
274 else if (req->idiag_family == AF_INET6) {
275 sk = inet6_lookup(&init_net, hashinfo,
276 (struct in6_addr *)req->id.idiag_dst,
277 req->id.idiag_dport,
278 (struct in6_addr *)req->id.idiag_src,
279 req->id.idiag_sport,
280 req->id.idiag_if);
281 }
282 #endif
283 else {
284 goto unlock;
285 }
286
287 err = -ENOENT;
288 if (sk == NULL)
289 goto unlock;
290
291 err = -ESTALE;
292 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
293 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
294 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
295 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
296 goto out;
297
298 err = -ENOMEM;
299 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
300 sizeof(struct inet_diag_meminfo) +
301 handler->idiag_info_size + 64)),
302 GFP_KERNEL);
303 if (!rep)
304 goto out;
305
306 err = sk_diag_fill(sk, rep, req->idiag_ext,
307 NETLINK_CB(in_skb).pid,
308 nlh->nlmsg_seq, 0, nlh);
309 if (err < 0) {
310 WARN_ON(err == -EMSGSIZE);
311 kfree_skb(rep);
312 goto out;
313 }
314 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
315 MSG_DONTWAIT);
316 if (err > 0)
317 err = 0;
318
319 out:
320 if (sk) {
321 if (sk->sk_state == TCP_TIME_WAIT)
322 inet_twsk_put((struct inet_timewait_sock *)sk);
323 else
324 sock_put(sk);
325 }
326 unlock:
327 inet_diag_unlock_handler(handler);
328 return err;
329 }
330
331 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
332 {
333 int words = bits >> 5;
334
335 bits &= 0x1f;
336
337 if (words) {
338 if (memcmp(a1, a2, words << 2))
339 return 0;
340 }
341 if (bits) {
342 __be32 w1, w2;
343 __be32 mask;
344
345 w1 = a1[words];
346 w2 = a2[words];
347
348 mask = htonl((0xffffffff) << (32 - bits));
349
350 if ((w1 ^ w2) & mask)
351 return 0;
352 }
353
354 return 1;
355 }
356
357
358 static int inet_diag_bc_run(const void *bc, int len,
359 const struct inet_diag_entry *entry)
360 {
361 while (len > 0) {
362 int yes = 1;
363 const struct inet_diag_bc_op *op = bc;
364
365 switch (op->code) {
366 case INET_DIAG_BC_NOP:
367 break;
368 case INET_DIAG_BC_JMP:
369 yes = 0;
370 break;
371 case INET_DIAG_BC_S_GE:
372 yes = entry->sport >= op[1].no;
373 break;
374 case INET_DIAG_BC_S_LE:
375 yes = entry->dport <= op[1].no;
376 break;
377 case INET_DIAG_BC_D_GE:
378 yes = entry->dport >= op[1].no;
379 break;
380 case INET_DIAG_BC_D_LE:
381 yes = entry->dport <= op[1].no;
382 break;
383 case INET_DIAG_BC_AUTO:
384 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
385 break;
386 case INET_DIAG_BC_S_COND:
387 case INET_DIAG_BC_D_COND: {
388 struct inet_diag_hostcond *cond;
389 __be32 *addr;
390
391 cond = (struct inet_diag_hostcond *)(op + 1);
392 if (cond->port != -1 &&
393 cond->port != (op->code == INET_DIAG_BC_S_COND ?
394 entry->sport : entry->dport)) {
395 yes = 0;
396 break;
397 }
398
399 if (cond->prefix_len == 0)
400 break;
401
402 if (op->code == INET_DIAG_BC_S_COND)
403 addr = entry->saddr;
404 else
405 addr = entry->daddr;
406
407 if (bitstring_match(addr, cond->addr,
408 cond->prefix_len))
409 break;
410 if (entry->family == AF_INET6 &&
411 cond->family == AF_INET) {
412 if (addr[0] == 0 && addr[1] == 0 &&
413 addr[2] == htonl(0xffff) &&
414 bitstring_match(addr + 3, cond->addr,
415 cond->prefix_len))
416 break;
417 }
418 yes = 0;
419 break;
420 }
421 }
422
423 if (yes) {
424 len -= op->yes;
425 bc += op->yes;
426 } else {
427 len -= op->no;
428 bc += op->no;
429 }
430 }
431 return (len == 0);
432 }
433
434 static int valid_cc(const void *bc, int len, int cc)
435 {
436 while (len >= 0) {
437 const struct inet_diag_bc_op *op = bc;
438
439 if (cc > len)
440 return 0;
441 if (cc == len)
442 return 1;
443 if (op->yes < 4)
444 return 0;
445 len -= op->yes;
446 bc += op->yes;
447 }
448 return 0;
449 }
450
451 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
452 {
453 const unsigned char *bc = bytecode;
454 int len = bytecode_len;
455
456 while (len > 0) {
457 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
458
459 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
460 switch (op->code) {
461 case INET_DIAG_BC_AUTO:
462 case INET_DIAG_BC_S_COND:
463 case INET_DIAG_BC_D_COND:
464 case INET_DIAG_BC_S_GE:
465 case INET_DIAG_BC_S_LE:
466 case INET_DIAG_BC_D_GE:
467 case INET_DIAG_BC_D_LE:
468 if (op->yes < 4 || op->yes > len + 4)
469 return -EINVAL;
470 case INET_DIAG_BC_JMP:
471 if (op->no < 4 || op->no > len + 4)
472 return -EINVAL;
473 if (op->no < len &&
474 !valid_cc(bytecode, bytecode_len, len - op->no))
475 return -EINVAL;
476 break;
477 case INET_DIAG_BC_NOP:
478 if (op->yes < 4 || op->yes > len + 4)
479 return -EINVAL;
480 break;
481 default:
482 return -EINVAL;
483 }
484 bc += op->yes;
485 len -= op->yes;
486 }
487 return len == 0 ? 0 : -EINVAL;
488 }
489
490 static int inet_csk_diag_dump(struct sock *sk,
491 struct sk_buff *skb,
492 struct netlink_callback *cb)
493 {
494 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
495
496 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
497 struct inet_diag_entry entry;
498 struct rtattr *bc = (struct rtattr *)(r + 1);
499 struct inet_sock *inet = inet_sk(sk);
500
501 entry.family = sk->sk_family;
502 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
503 if (entry.family == AF_INET6) {
504 struct ipv6_pinfo *np = inet6_sk(sk);
505
506 entry.saddr = np->rcv_saddr.s6_addr32;
507 entry.daddr = np->daddr.s6_addr32;
508 } else
509 #endif
510 {
511 entry.saddr = &inet->rcv_saddr;
512 entry.daddr = &inet->daddr;
513 }
514 entry.sport = inet->num;
515 entry.dport = ntohs(inet->dport);
516 entry.userlocks = sk->sk_userlocks;
517
518 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
519 return 0;
520 }
521
522 return inet_csk_diag_fill(sk, skb, r->idiag_ext,
523 NETLINK_CB(cb->skb).pid,
524 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
525 }
526
527 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
528 struct sk_buff *skb,
529 struct netlink_callback *cb)
530 {
531 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
532
533 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
534 struct inet_diag_entry entry;
535 struct rtattr *bc = (struct rtattr *)(r + 1);
536
537 entry.family = tw->tw_family;
538 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
539 if (tw->tw_family == AF_INET6) {
540 struct inet6_timewait_sock *tw6 =
541 inet6_twsk((struct sock *)tw);
542 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
543 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
544 } else
545 #endif
546 {
547 entry.saddr = &tw->tw_rcv_saddr;
548 entry.daddr = &tw->tw_daddr;
549 }
550 entry.sport = tw->tw_num;
551 entry.dport = ntohs(tw->tw_dport);
552 entry.userlocks = 0;
553
554 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
555 return 0;
556 }
557
558 return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
559 NETLINK_CB(cb->skb).pid,
560 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
561 }
562
563 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
564 struct request_sock *req, u32 pid, u32 seq,
565 const struct nlmsghdr *unlh)
566 {
567 const struct inet_request_sock *ireq = inet_rsk(req);
568 struct inet_sock *inet = inet_sk(sk);
569 unsigned char *b = skb_tail_pointer(skb);
570 struct inet_diag_msg *r;
571 struct nlmsghdr *nlh;
572 long tmo;
573
574 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
575 nlh->nlmsg_flags = NLM_F_MULTI;
576 r = NLMSG_DATA(nlh);
577
578 r->idiag_family = sk->sk_family;
579 r->idiag_state = TCP_SYN_RECV;
580 r->idiag_timer = 1;
581 r->idiag_retrans = req->retrans;
582
583 r->id.idiag_if = sk->sk_bound_dev_if;
584 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
585 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
586
587 tmo = req->expires - jiffies;
588 if (tmo < 0)
589 tmo = 0;
590
591 r->id.idiag_sport = inet->sport;
592 r->id.idiag_dport = ireq->rmt_port;
593 r->id.idiag_src[0] = ireq->loc_addr;
594 r->id.idiag_dst[0] = ireq->rmt_addr;
595 r->idiag_expires = jiffies_to_msecs(tmo);
596 r->idiag_rqueue = 0;
597 r->idiag_wqueue = 0;
598 r->idiag_uid = sock_i_uid(sk);
599 r->idiag_inode = 0;
600 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
601 if (r->idiag_family == AF_INET6) {
602 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
603 &inet6_rsk(req)->loc_addr);
604 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
605 &inet6_rsk(req)->rmt_addr);
606 }
607 #endif
608 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
609
610 return skb->len;
611
612 nlmsg_failure:
613 nlmsg_trim(skb, b);
614 return -1;
615 }
616
617 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
618 struct netlink_callback *cb)
619 {
620 struct inet_diag_entry entry;
621 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
622 struct inet_connection_sock *icsk = inet_csk(sk);
623 struct listen_sock *lopt;
624 struct rtattr *bc = NULL;
625 struct inet_sock *inet = inet_sk(sk);
626 int j, s_j;
627 int reqnum, s_reqnum;
628 int err = 0;
629
630 s_j = cb->args[3];
631 s_reqnum = cb->args[4];
632
633 if (s_j > 0)
634 s_j--;
635
636 entry.family = sk->sk_family;
637
638 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
639
640 lopt = icsk->icsk_accept_queue.listen_opt;
641 if (!lopt || !lopt->qlen)
642 goto out;
643
644 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
645 bc = (struct rtattr *)(r + 1);
646 entry.sport = 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(RTA_DATA(bc),
679 RTA_PAYLOAD(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 inet_listen_lock(hashinfo);
724 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
725 struct sock *sk;
726 struct hlist_node *node;
727
728 num = 0;
729 sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
730 struct inet_sock *inet = inet_sk(sk);
731
732 if (num < s_num) {
733 num++;
734 continue;
735 }
736
737 if (r->id.idiag_sport != inet->sport &&
738 r->id.idiag_sport)
739 goto next_listen;
740
741 if (!(r->idiag_states & TCPF_LISTEN) ||
742 r->id.idiag_dport ||
743 cb->args[3] > 0)
744 goto syn_recv;
745
746 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
747 inet_listen_unlock(hashinfo);
748 goto done;
749 }
750
751 syn_recv:
752 if (!(r->idiag_states & TCPF_SYN_RECV))
753 goto next_listen;
754
755 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
756 inet_listen_unlock(hashinfo);
757 goto done;
758 }
759
760 next_listen:
761 cb->args[3] = 0;
762 cb->args[4] = 0;
763 ++num;
764 }
765
766 s_num = 0;
767 cb->args[3] = 0;
768 cb->args[4] = 0;
769 }
770 inet_listen_unlock(hashinfo);
771 skip_listen_ht:
772 cb->args[0] = 1;
773 s_i = num = s_num = 0;
774 }
775
776 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
777 goto unlock;
778
779 for (i = s_i; i < hashinfo->ehash_size; i++) {
780 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
781 rwlock_t *lock = inet_ehash_lockp(hashinfo, i);
782 struct sock *sk;
783 struct hlist_node *node;
784
785 if (i > s_i)
786 s_num = 0;
787
788 read_lock_bh(lock);
789 num = 0;
790 sk_for_each(sk, node, &head->chain) {
791 struct inet_sock *inet = inet_sk(sk);
792
793 if (num < s_num)
794 goto next_normal;
795 if (!(r->idiag_states & (1 << sk->sk_state)))
796 goto next_normal;
797 if (r->id.idiag_sport != inet->sport &&
798 r->id.idiag_sport)
799 goto next_normal;
800 if (r->id.idiag_dport != inet->dport &&
801 r->id.idiag_dport)
802 goto next_normal;
803 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
804 read_unlock_bh(lock);
805 goto done;
806 }
807 next_normal:
808 ++num;
809 }
810
811 if (r->idiag_states & TCPF_TIME_WAIT) {
812 struct inet_timewait_sock *tw;
813
814 inet_twsk_for_each(tw, node,
815 &head->twchain) {
816
817 if (num < s_num)
818 goto next_dying;
819 if (r->id.idiag_sport != tw->tw_sport &&
820 r->id.idiag_sport)
821 goto next_dying;
822 if (r->id.idiag_dport != tw->tw_dport &&
823 r->id.idiag_dport)
824 goto next_dying;
825 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
826 read_unlock_bh(lock);
827 goto done;
828 }
829 next_dying:
830 ++num;
831 }
832 }
833 read_unlock_bh(lock);
834 }
835
836 done:
837 cb->args[1] = i;
838 cb->args[2] = num;
839 unlock:
840 inet_diag_unlock_handler(handler);
841 return skb->len;
842 }
843
844 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
845 {
846 int hdrlen = sizeof(struct inet_diag_req);
847
848 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
849 nlmsg_len(nlh) < hdrlen)
850 return -EINVAL;
851
852 if (nlh->nlmsg_flags & NLM_F_DUMP) {
853 if (nlmsg_attrlen(nlh, hdrlen)) {
854 struct nlattr *attr;
855
856 attr = nlmsg_find_attr(nlh, hdrlen,
857 INET_DIAG_REQ_BYTECODE);
858 if (attr == NULL ||
859 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
860 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
861 return -EINVAL;
862 }
863
864 return netlink_dump_start(idiagnl, skb, nlh,
865 inet_diag_dump, NULL);
866 }
867
868 return inet_diag_get_exact(skb, nlh);
869 }
870
871 static DEFINE_MUTEX(inet_diag_mutex);
872
873 static void inet_diag_rcv(struct sk_buff *skb)
874 {
875 mutex_lock(&inet_diag_mutex);
876 netlink_rcv_skb(skb, &inet_diag_rcv_msg);
877 mutex_unlock(&inet_diag_mutex);
878 }
879
880 int inet_diag_register(const struct inet_diag_handler *h)
881 {
882 const __u16 type = h->idiag_type;
883 int err = -EINVAL;
884
885 if (type >= INET_DIAG_GETSOCK_MAX)
886 goto out;
887
888 mutex_lock(&inet_diag_table_mutex);
889 err = -EEXIST;
890 if (inet_diag_table[type] == NULL) {
891 inet_diag_table[type] = h;
892 err = 0;
893 }
894 mutex_unlock(&inet_diag_table_mutex);
895 out:
896 return err;
897 }
898 EXPORT_SYMBOL_GPL(inet_diag_register);
899
900 void inet_diag_unregister(const struct inet_diag_handler *h)
901 {
902 const __u16 type = h->idiag_type;
903
904 if (type >= INET_DIAG_GETSOCK_MAX)
905 return;
906
907 mutex_lock(&inet_diag_table_mutex);
908 inet_diag_table[type] = NULL;
909 mutex_unlock(&inet_diag_table_mutex);
910 }
911 EXPORT_SYMBOL_GPL(inet_diag_unregister);
912
913 static int __init inet_diag_init(void)
914 {
915 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
916 sizeof(struct inet_diag_handler *));
917 int err = -ENOMEM;
918
919 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
920 if (!inet_diag_table)
921 goto out;
922
923 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
924 inet_diag_rcv, NULL, THIS_MODULE);
925 if (idiagnl == NULL)
926 goto out_free_table;
927 err = 0;
928 out:
929 return err;
930 out_free_table:
931 kfree(inet_diag_table);
932 goto out;
933 }
934
935 static void __exit inet_diag_exit(void)
936 {
937 netlink_kernel_release(idiagnl);
938 kfree(inet_diag_table);
939 }
940
941 module_init(inet_diag_init);
942 module_exit(inet_diag_exit);
943 MODULE_LICENSE("GPL");
944 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree