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[NETLINK]: Avoid pointer in netlink_run_queue
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv4 / inet_diag.c
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 int inet_csk_diag_fill(struct sock *sk,
55 struct sk_buff *skb,
56 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
57 const struct nlmsghdr *unlh)
58 {
59 const struct inet_sock *inet = inet_sk(sk);
60 const struct inet_connection_sock *icsk = inet_csk(sk);
61 struct inet_diag_msg *r;
62 struct nlmsghdr *nlh;
63 void *info = NULL;
64 struct inet_diag_meminfo *minfo = NULL;
65 unsigned char *b = skb_tail_pointer(skb);
66 const struct inet_diag_handler *handler;
67
68 handler = inet_diag_table[unlh->nlmsg_type];
69 BUG_ON(handler == NULL);
70
71 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
72 nlh->nlmsg_flags = nlmsg_flags;
73
74 r = NLMSG_DATA(nlh);
75 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
76
77 if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
78 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
79
80 if (ext & (1 << (INET_DIAG_INFO - 1)))
81 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
82 handler->idiag_info_size);
83
84 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
85 const size_t len = strlen(icsk->icsk_ca_ops->name);
86
87 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
88 icsk->icsk_ca_ops->name);
89 }
90
91 r->idiag_family = sk->sk_family;
92 r->idiag_state = sk->sk_state;
93 r->idiag_timer = 0;
94 r->idiag_retrans = 0;
95
96 r->id.idiag_if = sk->sk_bound_dev_if;
97 r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
98 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
99
100 r->id.idiag_sport = inet->sport;
101 r->id.idiag_dport = inet->dport;
102 r->id.idiag_src[0] = inet->rcv_saddr;
103 r->id.idiag_dst[0] = inet->daddr;
104
105 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
106 if (r->idiag_family == AF_INET6) {
107 struct ipv6_pinfo *np = inet6_sk(sk);
108
109 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
110 &np->rcv_saddr);
111 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
112 &np->daddr);
113 }
114 #endif
115
116 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
117
118 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
119 r->idiag_timer = 1;
120 r->idiag_retrans = icsk->icsk_retransmits;
121 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
122 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
123 r->idiag_timer = 4;
124 r->idiag_retrans = icsk->icsk_probes_out;
125 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
126 } else if (timer_pending(&sk->sk_timer)) {
127 r->idiag_timer = 2;
128 r->idiag_retrans = icsk->icsk_probes_out;
129 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
130 } else {
131 r->idiag_timer = 0;
132 r->idiag_expires = 0;
133 }
134 #undef EXPIRES_IN_MS
135
136 r->idiag_uid = sock_i_uid(sk);
137 r->idiag_inode = sock_i_ino(sk);
138
139 if (minfo) {
140 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
141 minfo->idiag_wmem = sk->sk_wmem_queued;
142 minfo->idiag_fmem = sk->sk_forward_alloc;
143 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
144 }
145
146 handler->idiag_get_info(sk, r, info);
147
148 if (sk->sk_state < TCP_TIME_WAIT &&
149 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
150 icsk->icsk_ca_ops->get_info(sk, ext, skb);
151
152 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
153 return skb->len;
154
155 rtattr_failure:
156 nlmsg_failure:
157 nlmsg_trim(skb, b);
158 return -EMSGSIZE;
159 }
160
161 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
162 struct sk_buff *skb, int ext, u32 pid,
163 u32 seq, u16 nlmsg_flags,
164 const struct nlmsghdr *unlh)
165 {
166 long tmo;
167 struct inet_diag_msg *r;
168 const unsigned char *previous_tail = skb_tail_pointer(skb);
169 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
170 unlh->nlmsg_type, sizeof(*r));
171
172 r = NLMSG_DATA(nlh);
173 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
174
175 nlh->nlmsg_flags = nlmsg_flags;
176
177 tmo = tw->tw_ttd - jiffies;
178 if (tmo < 0)
179 tmo = 0;
180
181 r->idiag_family = tw->tw_family;
182 r->idiag_state = tw->tw_state;
183 r->idiag_timer = 0;
184 r->idiag_retrans = 0;
185 r->id.idiag_if = tw->tw_bound_dev_if;
186 r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
187 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
188 r->id.idiag_sport = tw->tw_sport;
189 r->id.idiag_dport = tw->tw_dport;
190 r->id.idiag_src[0] = tw->tw_rcv_saddr;
191 r->id.idiag_dst[0] = tw->tw_daddr;
192 r->idiag_state = tw->tw_substate;
193 r->idiag_timer = 3;
194 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
195 r->idiag_rqueue = 0;
196 r->idiag_wqueue = 0;
197 r->idiag_uid = 0;
198 r->idiag_inode = 0;
199 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
200 if (tw->tw_family == AF_INET6) {
201 const struct inet6_timewait_sock *tw6 =
202 inet6_twsk((struct sock *)tw);
203
204 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
205 &tw6->tw_v6_rcv_saddr);
206 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
207 &tw6->tw_v6_daddr);
208 }
209 #endif
210 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
211 return skb->len;
212 nlmsg_failure:
213 nlmsg_trim(skb, previous_tail);
214 return -EMSGSIZE;
215 }
216
217 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
218 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
219 const struct nlmsghdr *unlh)
220 {
221 if (sk->sk_state == TCP_TIME_WAIT)
222 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
223 skb, ext, pid, seq, nlmsg_flags,
224 unlh);
225 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
226 }
227
228 static int inet_diag_get_exact(struct sk_buff *in_skb,
229 const struct nlmsghdr *nlh)
230 {
231 int err;
232 struct sock *sk;
233 struct inet_diag_req *req = NLMSG_DATA(nlh);
234 struct sk_buff *rep;
235 struct inet_hashinfo *hashinfo;
236 const struct inet_diag_handler *handler;
237
238 handler = inet_diag_table[nlh->nlmsg_type];
239 BUG_ON(handler == NULL);
240 hashinfo = handler->idiag_hashinfo;
241
242 if (req->idiag_family == AF_INET) {
243 sk = inet_lookup(hashinfo, req->id.idiag_dst[0],
244 req->id.idiag_dport, req->id.idiag_src[0],
245 req->id.idiag_sport, req->id.idiag_if);
246 }
247 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
248 else if (req->idiag_family == AF_INET6) {
249 sk = inet6_lookup(hashinfo,
250 (struct in6_addr *)req->id.idiag_dst,
251 req->id.idiag_dport,
252 (struct in6_addr *)req->id.idiag_src,
253 req->id.idiag_sport,
254 req->id.idiag_if);
255 }
256 #endif
257 else {
258 return -EINVAL;
259 }
260
261 if (sk == NULL)
262 return -ENOENT;
263
264 err = -ESTALE;
265 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
266 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
267 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
268 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
269 goto out;
270
271 err = -ENOMEM;
272 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
273 sizeof(struct inet_diag_meminfo) +
274 handler->idiag_info_size + 64)),
275 GFP_KERNEL);
276 if (!rep)
277 goto out;
278
279 err = sk_diag_fill(sk, rep, req->idiag_ext,
280 NETLINK_CB(in_skb).pid,
281 nlh->nlmsg_seq, 0, nlh);
282 if (err < 0) {
283 WARN_ON(err == -EMSGSIZE);
284 kfree_skb(rep);
285 goto out;
286 }
287 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
288 MSG_DONTWAIT);
289 if (err > 0)
290 err = 0;
291
292 out:
293 if (sk) {
294 if (sk->sk_state == TCP_TIME_WAIT)
295 inet_twsk_put((struct inet_timewait_sock *)sk);
296 else
297 sock_put(sk);
298 }
299 return err;
300 }
301
302 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
303 {
304 int words = bits >> 5;
305
306 bits &= 0x1f;
307
308 if (words) {
309 if (memcmp(a1, a2, words << 2))
310 return 0;
311 }
312 if (bits) {
313 __be32 w1, w2;
314 __be32 mask;
315
316 w1 = a1[words];
317 w2 = a2[words];
318
319 mask = htonl((0xffffffff) << (32 - bits));
320
321 if ((w1 ^ w2) & mask)
322 return 0;
323 }
324
325 return 1;
326 }
327
328
329 static int inet_diag_bc_run(const void *bc, int len,
330 const struct inet_diag_entry *entry)
331 {
332 while (len > 0) {
333 int yes = 1;
334 const struct inet_diag_bc_op *op = bc;
335
336 switch (op->code) {
337 case INET_DIAG_BC_NOP:
338 break;
339 case INET_DIAG_BC_JMP:
340 yes = 0;
341 break;
342 case INET_DIAG_BC_S_GE:
343 yes = entry->sport >= op[1].no;
344 break;
345 case INET_DIAG_BC_S_LE:
346 yes = entry->dport <= op[1].no;
347 break;
348 case INET_DIAG_BC_D_GE:
349 yes = entry->dport >= op[1].no;
350 break;
351 case INET_DIAG_BC_D_LE:
352 yes = entry->dport <= op[1].no;
353 break;
354 case INET_DIAG_BC_AUTO:
355 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
356 break;
357 case INET_DIAG_BC_S_COND:
358 case INET_DIAG_BC_D_COND: {
359 struct inet_diag_hostcond *cond;
360 __be32 *addr;
361
362 cond = (struct inet_diag_hostcond *)(op + 1);
363 if (cond->port != -1 &&
364 cond->port != (op->code == INET_DIAG_BC_S_COND ?
365 entry->sport : entry->dport)) {
366 yes = 0;
367 break;
368 }
369
370 if (cond->prefix_len == 0)
371 break;
372
373 if (op->code == INET_DIAG_BC_S_COND)
374 addr = entry->saddr;
375 else
376 addr = entry->daddr;
377
378 if (bitstring_match(addr, cond->addr,
379 cond->prefix_len))
380 break;
381 if (entry->family == AF_INET6 &&
382 cond->family == AF_INET) {
383 if (addr[0] == 0 && addr[1] == 0 &&
384 addr[2] == htonl(0xffff) &&
385 bitstring_match(addr + 3, cond->addr,
386 cond->prefix_len))
387 break;
388 }
389 yes = 0;
390 break;
391 }
392 }
393
394 if (yes) {
395 len -= op->yes;
396 bc += op->yes;
397 } else {
398 len -= op->no;
399 bc += op->no;
400 }
401 }
402 return (len == 0);
403 }
404
405 static int valid_cc(const void *bc, int len, int cc)
406 {
407 while (len >= 0) {
408 const struct inet_diag_bc_op *op = bc;
409
410 if (cc > len)
411 return 0;
412 if (cc == len)
413 return 1;
414 if (op->yes < 4)
415 return 0;
416 len -= op->yes;
417 bc += op->yes;
418 }
419 return 0;
420 }
421
422 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
423 {
424 const unsigned char *bc = bytecode;
425 int len = bytecode_len;
426
427 while (len > 0) {
428 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
429
430 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
431 switch (op->code) {
432 case INET_DIAG_BC_AUTO:
433 case INET_DIAG_BC_S_COND:
434 case INET_DIAG_BC_D_COND:
435 case INET_DIAG_BC_S_GE:
436 case INET_DIAG_BC_S_LE:
437 case INET_DIAG_BC_D_GE:
438 case INET_DIAG_BC_D_LE:
439 if (op->yes < 4 || op->yes > len + 4)
440 return -EINVAL;
441 case INET_DIAG_BC_JMP:
442 if (op->no < 4 || op->no > len + 4)
443 return -EINVAL;
444 if (op->no < len &&
445 !valid_cc(bytecode, bytecode_len, len - op->no))
446 return -EINVAL;
447 break;
448 case INET_DIAG_BC_NOP:
449 if (op->yes < 4 || op->yes > len + 4)
450 return -EINVAL;
451 break;
452 default:
453 return -EINVAL;
454 }
455 bc += op->yes;
456 len -= op->yes;
457 }
458 return len == 0 ? 0 : -EINVAL;
459 }
460
461 static int inet_csk_diag_dump(struct sock *sk,
462 struct sk_buff *skb,
463 struct netlink_callback *cb)
464 {
465 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
466
467 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
468 struct inet_diag_entry entry;
469 struct rtattr *bc = (struct rtattr *)(r + 1);
470 struct inet_sock *inet = inet_sk(sk);
471
472 entry.family = sk->sk_family;
473 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
474 if (entry.family == AF_INET6) {
475 struct ipv6_pinfo *np = inet6_sk(sk);
476
477 entry.saddr = np->rcv_saddr.s6_addr32;
478 entry.daddr = np->daddr.s6_addr32;
479 } else
480 #endif
481 {
482 entry.saddr = &inet->rcv_saddr;
483 entry.daddr = &inet->daddr;
484 }
485 entry.sport = inet->num;
486 entry.dport = ntohs(inet->dport);
487 entry.userlocks = sk->sk_userlocks;
488
489 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
490 return 0;
491 }
492
493 return inet_csk_diag_fill(sk, skb, r->idiag_ext,
494 NETLINK_CB(cb->skb).pid,
495 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
496 }
497
498 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
499 struct sk_buff *skb,
500 struct netlink_callback *cb)
501 {
502 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
503
504 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
505 struct inet_diag_entry entry;
506 struct rtattr *bc = (struct rtattr *)(r + 1);
507
508 entry.family = tw->tw_family;
509 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
510 if (tw->tw_family == AF_INET6) {
511 struct inet6_timewait_sock *tw6 =
512 inet6_twsk((struct sock *)tw);
513 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
514 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
515 } else
516 #endif
517 {
518 entry.saddr = &tw->tw_rcv_saddr;
519 entry.daddr = &tw->tw_daddr;
520 }
521 entry.sport = tw->tw_num;
522 entry.dport = ntohs(tw->tw_dport);
523 entry.userlocks = 0;
524
525 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
526 return 0;
527 }
528
529 return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
530 NETLINK_CB(cb->skb).pid,
531 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
532 }
533
534 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
535 struct request_sock *req, u32 pid, u32 seq,
536 const struct nlmsghdr *unlh)
537 {
538 const struct inet_request_sock *ireq = inet_rsk(req);
539 struct inet_sock *inet = inet_sk(sk);
540 unsigned char *b = skb_tail_pointer(skb);
541 struct inet_diag_msg *r;
542 struct nlmsghdr *nlh;
543 long tmo;
544
545 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
546 nlh->nlmsg_flags = NLM_F_MULTI;
547 r = NLMSG_DATA(nlh);
548
549 r->idiag_family = sk->sk_family;
550 r->idiag_state = TCP_SYN_RECV;
551 r->idiag_timer = 1;
552 r->idiag_retrans = req->retrans;
553
554 r->id.idiag_if = sk->sk_bound_dev_if;
555 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
556 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
557
558 tmo = req->expires - jiffies;
559 if (tmo < 0)
560 tmo = 0;
561
562 r->id.idiag_sport = inet->sport;
563 r->id.idiag_dport = ireq->rmt_port;
564 r->id.idiag_src[0] = ireq->loc_addr;
565 r->id.idiag_dst[0] = ireq->rmt_addr;
566 r->idiag_expires = jiffies_to_msecs(tmo);
567 r->idiag_rqueue = 0;
568 r->idiag_wqueue = 0;
569 r->idiag_uid = sock_i_uid(sk);
570 r->idiag_inode = 0;
571 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
572 if (r->idiag_family == AF_INET6) {
573 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
574 &inet6_rsk(req)->loc_addr);
575 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
576 &inet6_rsk(req)->rmt_addr);
577 }
578 #endif
579 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
580
581 return skb->len;
582
583 nlmsg_failure:
584 nlmsg_trim(skb, b);
585 return -1;
586 }
587
588 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
589 struct netlink_callback *cb)
590 {
591 struct inet_diag_entry entry;
592 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
593 struct inet_connection_sock *icsk = inet_csk(sk);
594 struct listen_sock *lopt;
595 struct rtattr *bc = NULL;
596 struct inet_sock *inet = inet_sk(sk);
597 int j, s_j;
598 int reqnum, s_reqnum;
599 int err = 0;
600
601 s_j = cb->args[3];
602 s_reqnum = cb->args[4];
603
604 if (s_j > 0)
605 s_j--;
606
607 entry.family = sk->sk_family;
608
609 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
610
611 lopt = icsk->icsk_accept_queue.listen_opt;
612 if (!lopt || !lopt->qlen)
613 goto out;
614
615 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
616 bc = (struct rtattr *)(r + 1);
617 entry.sport = inet->num;
618 entry.userlocks = sk->sk_userlocks;
619 }
620
621 for (j = s_j; j < lopt->nr_table_entries; j++) {
622 struct request_sock *req, *head = lopt->syn_table[j];
623
624 reqnum = 0;
625 for (req = head; req; reqnum++, req = req->dl_next) {
626 struct inet_request_sock *ireq = inet_rsk(req);
627
628 if (reqnum < s_reqnum)
629 continue;
630 if (r->id.idiag_dport != ireq->rmt_port &&
631 r->id.idiag_dport)
632 continue;
633
634 if (bc) {
635 entry.saddr =
636 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
637 (entry.family == AF_INET6) ?
638 inet6_rsk(req)->loc_addr.s6_addr32 :
639 #endif
640 &ireq->loc_addr;
641 entry.daddr =
642 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
643 (entry.family == AF_INET6) ?
644 inet6_rsk(req)->rmt_addr.s6_addr32 :
645 #endif
646 &ireq->rmt_addr;
647 entry.dport = ntohs(ireq->rmt_port);
648
649 if (!inet_diag_bc_run(RTA_DATA(bc),
650 RTA_PAYLOAD(bc), &entry))
651 continue;
652 }
653
654 err = inet_diag_fill_req(skb, sk, req,
655 NETLINK_CB(cb->skb).pid,
656 cb->nlh->nlmsg_seq, cb->nlh);
657 if (err < 0) {
658 cb->args[3] = j + 1;
659 cb->args[4] = reqnum;
660 goto out;
661 }
662 }
663
664 s_reqnum = 0;
665 }
666
667 out:
668 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
669
670 return err;
671 }
672
673 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
674 {
675 int i, num;
676 int s_i, s_num;
677 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
678 const struct inet_diag_handler *handler;
679 struct inet_hashinfo *hashinfo;
680
681 handler = inet_diag_table[cb->nlh->nlmsg_type];
682 BUG_ON(handler == NULL);
683 hashinfo = handler->idiag_hashinfo;
684
685 s_i = cb->args[1];
686 s_num = num = cb->args[2];
687
688 if (cb->args[0] == 0) {
689 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
690 goto skip_listen_ht;
691
692 inet_listen_lock(hashinfo);
693 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
694 struct sock *sk;
695 struct hlist_node *node;
696
697 num = 0;
698 sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
699 struct inet_sock *inet = inet_sk(sk);
700
701 if (num < s_num) {
702 num++;
703 continue;
704 }
705
706 if (r->id.idiag_sport != inet->sport &&
707 r->id.idiag_sport)
708 goto next_listen;
709
710 if (!(r->idiag_states & TCPF_LISTEN) ||
711 r->id.idiag_dport ||
712 cb->args[3] > 0)
713 goto syn_recv;
714
715 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
716 inet_listen_unlock(hashinfo);
717 goto done;
718 }
719
720 syn_recv:
721 if (!(r->idiag_states & TCPF_SYN_RECV))
722 goto next_listen;
723
724 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
725 inet_listen_unlock(hashinfo);
726 goto done;
727 }
728
729 next_listen:
730 cb->args[3] = 0;
731 cb->args[4] = 0;
732 ++num;
733 }
734
735 s_num = 0;
736 cb->args[3] = 0;
737 cb->args[4] = 0;
738 }
739 inet_listen_unlock(hashinfo);
740 skip_listen_ht:
741 cb->args[0] = 1;
742 s_i = num = s_num = 0;
743 }
744
745 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
746 return skb->len;
747
748 for (i = s_i; i < hashinfo->ehash_size; i++) {
749 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
750 struct sock *sk;
751 struct hlist_node *node;
752
753 if (i > s_i)
754 s_num = 0;
755
756 read_lock_bh(&head->lock);
757 num = 0;
758 sk_for_each(sk, node, &head->chain) {
759 struct inet_sock *inet = inet_sk(sk);
760
761 if (num < s_num)
762 goto next_normal;
763 if (!(r->idiag_states & (1 << sk->sk_state)))
764 goto next_normal;
765 if (r->id.idiag_sport != inet->sport &&
766 r->id.idiag_sport)
767 goto next_normal;
768 if (r->id.idiag_dport != inet->dport &&
769 r->id.idiag_dport)
770 goto next_normal;
771 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
772 read_unlock_bh(&head->lock);
773 goto done;
774 }
775 next_normal:
776 ++num;
777 }
778
779 if (r->idiag_states & TCPF_TIME_WAIT) {
780 struct inet_timewait_sock *tw;
781
782 inet_twsk_for_each(tw, node,
783 &head->twchain) {
784
785 if (num < s_num)
786 goto next_dying;
787 if (r->id.idiag_sport != tw->tw_sport &&
788 r->id.idiag_sport)
789 goto next_dying;
790 if (r->id.idiag_dport != tw->tw_dport &&
791 r->id.idiag_dport)
792 goto next_dying;
793 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
794 read_unlock_bh(&head->lock);
795 goto done;
796 }
797 next_dying:
798 ++num;
799 }
800 }
801 read_unlock_bh(&head->lock);
802 }
803
804 done:
805 cb->args[1] = i;
806 cb->args[2] = num;
807 return skb->len;
808 }
809
810 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
811 {
812 int hdrlen = sizeof(struct inet_diag_req);
813
814 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
815 nlmsg_len(nlh) < hdrlen)
816 return -EINVAL;
817
818 if (inet_diag_table[nlh->nlmsg_type] == NULL)
819 return -ENOENT;
820
821 if (nlh->nlmsg_flags & NLM_F_DUMP) {
822 if (nlmsg_attrlen(nlh, hdrlen)) {
823 struct nlattr *attr;
824
825 attr = nlmsg_find_attr(nlh, hdrlen,
826 INET_DIAG_REQ_BYTECODE);
827 if (attr == NULL ||
828 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
829 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
830 return -EINVAL;
831 }
832
833 return netlink_dump_start(idiagnl, skb, nlh,
834 inet_diag_dump, NULL);
835 }
836
837 return inet_diag_get_exact(skb, nlh);
838 }
839
840 static DEFINE_MUTEX(inet_diag_mutex);
841
842 static void inet_diag_rcv(struct sock *sk, int len)
843 {
844 unsigned int qlen = 0;
845
846 do {
847 mutex_lock(&inet_diag_mutex);
848 qlen = netlink_run_queue(sk, qlen, &inet_diag_rcv_msg);
849 mutex_unlock(&inet_diag_mutex);
850 } while (qlen);
851 }
852
853 static DEFINE_SPINLOCK(inet_diag_register_lock);
854
855 int inet_diag_register(const struct inet_diag_handler *h)
856 {
857 const __u16 type = h->idiag_type;
858 int err = -EINVAL;
859
860 if (type >= INET_DIAG_GETSOCK_MAX)
861 goto out;
862
863 spin_lock(&inet_diag_register_lock);
864 err = -EEXIST;
865 if (inet_diag_table[type] == NULL) {
866 inet_diag_table[type] = h;
867 err = 0;
868 }
869 spin_unlock(&inet_diag_register_lock);
870 out:
871 return err;
872 }
873 EXPORT_SYMBOL_GPL(inet_diag_register);
874
875 void inet_diag_unregister(const struct inet_diag_handler *h)
876 {
877 const __u16 type = h->idiag_type;
878
879 if (type >= INET_DIAG_GETSOCK_MAX)
880 return;
881
882 spin_lock(&inet_diag_register_lock);
883 inet_diag_table[type] = NULL;
884 spin_unlock(&inet_diag_register_lock);
885
886 synchronize_rcu();
887 }
888 EXPORT_SYMBOL_GPL(inet_diag_unregister);
889
890 static int __init inet_diag_init(void)
891 {
892 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
893 sizeof(struct inet_diag_handler *));
894 int err = -ENOMEM;
895
896 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
897 if (!inet_diag_table)
898 goto out;
899
900 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
901 inet_diag_rcv, NULL, THIS_MODULE);
902 if (idiagnl == NULL)
903 goto out_free_table;
904 err = 0;
905 out:
906 return err;
907 out_free_table:
908 kfree(inet_diag_table);
909 goto out;
910 }
911
912 static void __exit inet_diag_exit(void)
913 {
914 sock_release(idiagnl->sk_socket);
915 kfree(inet_diag_table);
916 }
917
918 module_init(inet_diag_init);
919 module_exit(inet_diag_exit);
920 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)