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[TCPDIAG]: Just rename everything to inet_diag
[linux-2.6/kvm.git] / net / ipv4 / tcp_diag.c
blob24abe82e23a08245bab4dfef74cfcb6814e81f18
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/config.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
32 #include <linux/inet.h>
33 #include <linux/stddef.h>
34
35 #include <linux/tcp_diag.h>
36
37 static const struct inet_diag_handler **inet_diag_table;
38
39 struct inet_diag_entry {
40 u32 *saddr;
41 u32 *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 int inet_diag_fill(struct sk_buff *skb, struct sock *sk,
54 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
55 const struct nlmsghdr *unlh)
56 {
57 const struct inet_sock *inet = inet_sk(sk);
58 const struct inet_connection_sock *icsk = inet_csk(sk);
59 struct inet_diag_msg *r;
60 struct nlmsghdr *nlh;
61 void *info = NULL;
62 struct inet_diag_meminfo *minfo = NULL;
63 unsigned char *b = skb->tail;
64 const struct inet_diag_handler *handler;
65
66 handler = inet_diag_table[unlh->nlmsg_type];
67 BUG_ON(handler == NULL);
68
69 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
70 nlh->nlmsg_flags = nlmsg_flags;
71
72 r = NLMSG_DATA(nlh);
73 if (sk->sk_state != TCP_TIME_WAIT) {
74 if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
75 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO,
76 sizeof(*minfo));
77 if (ext & (1 << (INET_DIAG_INFO - 1)))
78 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
79 handler->idiag_info_size);
80
81 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
82 size_t len = strlen(icsk->icsk_ca_ops->name);
83 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
84 icsk->icsk_ca_ops->name);
85 }
86 }
87 r->idiag_family = sk->sk_family;
88 r->idiag_state = sk->sk_state;
89 r->idiag_timer = 0;
90 r->idiag_retrans = 0;
91
92 r->id.idiag_if = sk->sk_bound_dev_if;
93 r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
94 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
95
96 if (r->idiag_state == TCP_TIME_WAIT) {
97 const struct inet_timewait_sock *tw = inet_twsk(sk);
98 long tmo = tw->tw_ttd - jiffies;
99 if (tmo < 0)
100 tmo = 0;
101
102 r->id.idiag_sport = tw->tw_sport;
103 r->id.idiag_dport = tw->tw_dport;
104 r->id.idiag_src[0] = tw->tw_rcv_saddr;
105 r->id.idiag_dst[0] = tw->tw_daddr;
106 r->idiag_state = tw->tw_substate;
107 r->idiag_timer = 3;
108 r->idiag_expires = (tmo * 1000 + HZ - 1) / HZ;
109 r->idiag_rqueue = 0;
110 r->idiag_wqueue = 0;
111 r->idiag_uid = 0;
112 r->idiag_inode = 0;
113 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
114 if (r->idiag_family == AF_INET6) {
115 const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
116
117 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
118 &tcp6tw->tw_v6_rcv_saddr);
119 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
120 &tcp6tw->tw_v6_daddr);
121 }
122 #endif
123 nlh->nlmsg_len = skb->tail - b;
124 return skb->len;
125 }
126
127 r->id.idiag_sport = inet->sport;
128 r->id.idiag_dport = inet->dport;
129 r->id.idiag_src[0] = inet->rcv_saddr;
130 r->id.idiag_dst[0] = inet->daddr;
131
132 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
133 if (r->idiag_family == AF_INET6) {
134 struct ipv6_pinfo *np = inet6_sk(sk);
135
136 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
137 &np->rcv_saddr);
138 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
139 &np->daddr);
140 }
141 #endif
142
143 #define EXPIRES_IN_MS(tmo) ((tmo-jiffies)*1000+HZ-1)/HZ
144
145 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
146 r->idiag_timer = 1;
147 r->idiag_retrans = icsk->icsk_retransmits;
148 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
149 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
150 r->idiag_timer = 4;
151 r->idiag_retrans = icsk->icsk_probes_out;
152 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
153 } else if (timer_pending(&sk->sk_timer)) {
154 r->idiag_timer = 2;
155 r->idiag_retrans = icsk->icsk_probes_out;
156 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
157 } else {
158 r->idiag_timer = 0;
159 r->idiag_expires = 0;
160 }
161 #undef EXPIRES_IN_MS
162
163 r->idiag_uid = sock_i_uid(sk);
164 r->idiag_inode = sock_i_ino(sk);
165
166 if (minfo) {
167 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
168 minfo->idiag_wmem = sk->sk_wmem_queued;
169 minfo->idiag_fmem = sk->sk_forward_alloc;
170 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
171 }
172
173 handler->idiag_get_info(sk, r, info);
174
175 if (sk->sk_state < TCP_TIME_WAIT &&
176 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
177 icsk->icsk_ca_ops->get_info(sk, ext, skb);
178
179 nlh->nlmsg_len = skb->tail - b;
180 return skb->len;
181
182 rtattr_failure:
183 nlmsg_failure:
184 skb_trim(skb, b - skb->data);
185 return -1;
186 }
187
188 static int inet_diag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh)
189 {
190 int err;
191 struct sock *sk;
192 struct inet_diag_req *req = NLMSG_DATA(nlh);
193 struct sk_buff *rep;
194 struct inet_hashinfo *hashinfo;
195 const struct inet_diag_handler *handler;
196
197 handler = inet_diag_table[nlh->nlmsg_type];
198 BUG_ON(handler == NULL);
199 hashinfo = handler->idiag_hashinfo;
200
201 if (req->idiag_family == AF_INET) {
202 sk = inet_lookup(hashinfo, req->id.idiag_dst[0],
203 req->id.idiag_dport, req->id.idiag_src[0],
204 req->id.idiag_sport, req->id.idiag_if);
205 }
206 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
207 else if (req->idiag_family == AF_INET6) {
208 sk = inet6_lookup(hashinfo,
209 (struct in6_addr *)req->id.idiag_dst,
210 req->id.idiag_dport,
211 (struct in6_addr *)req->id.idiag_src,
212 req->id.idiag_sport,
213 req->id.idiag_if);
214 }
215 #endif
216 else {
217 return -EINVAL;
218 }
219
220 if (sk == NULL)
221 return -ENOENT;
222
223 err = -ESTALE;
224 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
225 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
226 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
227 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
228 goto out;
229
230 err = -ENOMEM;
231 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
232 sizeof(struct inet_diag_meminfo) +
233 handler->idiag_info_size + 64)),
234 GFP_KERNEL);
235 if (!rep)
236 goto out;
237
238 if (inet_diag_fill(rep, sk, req->idiag_ext,
239 NETLINK_CB(in_skb).pid,
240 nlh->nlmsg_seq, 0, nlh) <= 0)
241 BUG();
242
243 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
244 MSG_DONTWAIT);
245 if (err > 0)
246 err = 0;
247
248 out:
249 if (sk) {
250 if (sk->sk_state == TCP_TIME_WAIT)
251 inet_twsk_put((struct inet_timewait_sock *)sk);
252 else
253 sock_put(sk);
254 }
255 return err;
256 }
257
258 static int bitstring_match(const u32 *a1, const u32 *a2, int bits)
259 {
260 int words = bits >> 5;
261
262 bits &= 0x1f;
263
264 if (words) {
265 if (memcmp(a1, a2, words << 2))
266 return 0;
267 }
268 if (bits) {
269 __u32 w1, w2;
270 __u32 mask;
271
272 w1 = a1[words];
273 w2 = a2[words];
274
275 mask = htonl((0xffffffff) << (32 - bits));
276
277 if ((w1 ^ w2) & mask)
278 return 0;
279 }
280
281 return 1;
282 }
283
284
285 static int inet_diag_bc_run(const void *bc, int len,
286 const struct inet_diag_entry *entry)
287 {
288 while (len > 0) {
289 int yes = 1;
290 const struct inet_diag_bc_op *op = bc;
291
292 switch (op->code) {
293 case INET_DIAG_BC_NOP:
294 break;
295 case INET_DIAG_BC_JMP:
296 yes = 0;
297 break;
298 case INET_DIAG_BC_S_GE:
299 yes = entry->sport >= op[1].no;
300 break;
301 case INET_DIAG_BC_S_LE:
302 yes = entry->dport <= op[1].no;
303 break;
304 case INET_DIAG_BC_D_GE:
305 yes = entry->dport >= op[1].no;
306 break;
307 case INET_DIAG_BC_D_LE:
308 yes = entry->dport <= op[1].no;
309 break;
310 case INET_DIAG_BC_AUTO:
311 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
312 break;
313 case INET_DIAG_BC_S_COND:
314 case INET_DIAG_BC_D_COND:
315 {
316 struct inet_diag_hostcond *cond = (struct inet_diag_hostcond*)(op+1);
317 u32 *addr;
318
319 if (cond->port != -1 &&
320 cond->port != (op->code == INET_DIAG_BC_S_COND ?
321 entry->sport : entry->dport)) {
322 yes = 0;
323 break;
324 }
325
326 if (cond->prefix_len == 0)
327 break;
328
329 if (op->code == INET_DIAG_BC_S_COND)
330 addr = entry->saddr;
331 else
332 addr = entry->daddr;
333
334 if (bitstring_match(addr, cond->addr, cond->prefix_len))
335 break;
336 if (entry->family == AF_INET6 &&
337 cond->family == AF_INET) {
338 if (addr[0] == 0 && addr[1] == 0 &&
339 addr[2] == htonl(0xffff) &&
340 bitstring_match(addr+3, cond->addr, cond->prefix_len))
341 break;
342 }
343 yes = 0;
344 break;
345 }
346 }
347
348 if (yes) {
349 len -= op->yes;
350 bc += op->yes;
351 } else {
352 len -= op->no;
353 bc += op->no;
354 }
355 }
356 return (len == 0);
357 }
358
359 static int valid_cc(const void *bc, int len, int cc)
360 {
361 while (len >= 0) {
362 const struct inet_diag_bc_op *op = bc;
363
364 if (cc > len)
365 return 0;
366 if (cc == len)
367 return 1;
368 if (op->yes < 4)
369 return 0;
370 len -= op->yes;
371 bc += op->yes;
372 }
373 return 0;
374 }
375
376 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
377 {
378 const unsigned char *bc = bytecode;
379 int len = bytecode_len;
380
381 while (len > 0) {
382 struct inet_diag_bc_op *op = (struct inet_diag_bc_op*)bc;
383
384 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
385 switch (op->code) {
386 case INET_DIAG_BC_AUTO:
387 case INET_DIAG_BC_S_COND:
388 case INET_DIAG_BC_D_COND:
389 case INET_DIAG_BC_S_GE:
390 case INET_DIAG_BC_S_LE:
391 case INET_DIAG_BC_D_GE:
392 case INET_DIAG_BC_D_LE:
393 if (op->yes < 4 || op->yes > len+4)
394 return -EINVAL;
395 case INET_DIAG_BC_JMP:
396 if (op->no < 4 || op->no > len+4)
397 return -EINVAL;
398 if (op->no < len &&
399 !valid_cc(bytecode, bytecode_len, len-op->no))
400 return -EINVAL;
401 break;
402 case INET_DIAG_BC_NOP:
403 if (op->yes < 4 || op->yes > len+4)
404 return -EINVAL;
405 break;
406 default:
407 return -EINVAL;
408 }
409 bc += op->yes;
410 len -= op->yes;
411 }
412 return len == 0 ? 0 : -EINVAL;
413 }
414
415 static int inet_diag_dump_sock(struct sk_buff *skb, struct sock *sk,
416 struct netlink_callback *cb)
417 {
418 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
419
420 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
421 struct inet_diag_entry entry;
422 struct rtattr *bc = (struct rtattr *)(r + 1);
423 struct inet_sock *inet = inet_sk(sk);
424
425 entry.family = sk->sk_family;
426 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
427 if (entry.family == AF_INET6) {
428 struct ipv6_pinfo *np = inet6_sk(sk);
429
430 entry.saddr = np->rcv_saddr.s6_addr32;
431 entry.daddr = np->daddr.s6_addr32;
432 } else
433 #endif
434 {
435 entry.saddr = &inet->rcv_saddr;
436 entry.daddr = &inet->daddr;
437 }
438 entry.sport = inet->num;
439 entry.dport = ntohs(inet->dport);
440 entry.userlocks = sk->sk_userlocks;
441
442 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
443 return 0;
444 }
445
446 return inet_diag_fill(skb, sk, r->idiag_ext, NETLINK_CB(cb->skb).pid,
447 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
448 }
449
450 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
451 struct request_sock *req,
452 u32 pid, u32 seq,
453 const struct nlmsghdr *unlh)
454 {
455 const struct inet_request_sock *ireq = inet_rsk(req);
456 struct inet_sock *inet = inet_sk(sk);
457 unsigned char *b = skb->tail;
458 struct inet_diag_msg *r;
459 struct nlmsghdr *nlh;
460 long tmo;
461
462 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
463 nlh->nlmsg_flags = NLM_F_MULTI;
464 r = NLMSG_DATA(nlh);
465
466 r->idiag_family = sk->sk_family;
467 r->idiag_state = TCP_SYN_RECV;
468 r->idiag_timer = 1;
469 r->idiag_retrans = req->retrans;
470
471 r->id.idiag_if = sk->sk_bound_dev_if;
472 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
473 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
474
475 tmo = req->expires - jiffies;
476 if (tmo < 0)
477 tmo = 0;
478
479 r->id.idiag_sport = inet->sport;
480 r->id.idiag_dport = ireq->rmt_port;
481 r->id.idiag_src[0] = ireq->loc_addr;
482 r->id.idiag_dst[0] = ireq->rmt_addr;
483 r->idiag_expires = jiffies_to_msecs(tmo);
484 r->idiag_rqueue = 0;
485 r->idiag_wqueue = 0;
486 r->idiag_uid = sock_i_uid(sk);
487 r->idiag_inode = 0;
488 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
489 if (r->idiag_family == AF_INET6) {
490 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
491 &tcp6_rsk(req)->loc_addr);
492 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
493 &tcp6_rsk(req)->rmt_addr);
494 }
495 #endif
496 nlh->nlmsg_len = skb->tail - b;
497
498 return skb->len;
499
500 nlmsg_failure:
501 skb_trim(skb, b - skb->data);
502 return -1;
503 }
504
505 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
506 struct netlink_callback *cb)
507 {
508 struct inet_diag_entry entry;
509 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
510 struct inet_connection_sock *icsk = inet_csk(sk);
511 struct listen_sock *lopt;
512 struct rtattr *bc = NULL;
513 struct inet_sock *inet = inet_sk(sk);
514 int j, s_j;
515 int reqnum, s_reqnum;
516 int err = 0;
517
518 s_j = cb->args[3];
519 s_reqnum = cb->args[4];
520
521 if (s_j > 0)
522 s_j--;
523
524 entry.family = sk->sk_family;
525
526 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
527
528 lopt = icsk->icsk_accept_queue.listen_opt;
529 if (!lopt || !lopt->qlen)
530 goto out;
531
532 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
533 bc = (struct rtattr *)(r + 1);
534 entry.sport = inet->num;
535 entry.userlocks = sk->sk_userlocks;
536 }
537
538 for (j = s_j; j < lopt->nr_table_entries; j++) {
539 struct request_sock *req, *head = lopt->syn_table[j];
540
541 reqnum = 0;
542 for (req = head; req; reqnum++, req = req->dl_next) {
543 struct inet_request_sock *ireq = inet_rsk(req);
544
545 if (reqnum < s_reqnum)
546 continue;
547 if (r->id.idiag_dport != ireq->rmt_port &&
548 r->id.idiag_dport)
549 continue;
550
551 if (bc) {
552 entry.saddr =
553 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
554 (entry.family == AF_INET6) ?
555 tcp6_rsk(req)->loc_addr.s6_addr32 :
556 #endif
557 &ireq->loc_addr;
558 entry.daddr =
559 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
560 (entry.family == AF_INET6) ?
561 tcp6_rsk(req)->rmt_addr.s6_addr32 :
562 #endif
563 &ireq->rmt_addr;
564 entry.dport = ntohs(ireq->rmt_port);
565
566 if (!inet_diag_bc_run(RTA_DATA(bc),
567 RTA_PAYLOAD(bc), &entry))
568 continue;
569 }
570
571 err = inet_diag_fill_req(skb, sk, req,
572 NETLINK_CB(cb->skb).pid,
573 cb->nlh->nlmsg_seq, cb->nlh);
574 if (err < 0) {
575 cb->args[3] = j + 1;
576 cb->args[4] = reqnum;
577 goto out;
578 }
579 }
580
581 s_reqnum = 0;
582 }
583
584 out:
585 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
586
587 return err;
588 }
589
590 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
591 {
592 int i, num;
593 int s_i, s_num;
594 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
595 const struct inet_diag_handler *handler;
596 struct inet_hashinfo *hashinfo;
597
598 handler = inet_diag_table[cb->nlh->nlmsg_type];
599 BUG_ON(handler == NULL);
600 hashinfo = handler->idiag_hashinfo;
601
602 s_i = cb->args[1];
603 s_num = num = cb->args[2];
604
605 if (cb->args[0] == 0) {
606 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
607 goto skip_listen_ht;
608
609 inet_listen_lock(hashinfo);
610 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
611 struct sock *sk;
612 struct hlist_node *node;
613
614 num = 0;
615 sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
616 struct inet_sock *inet = inet_sk(sk);
617
618 if (num < s_num) {
619 num++;
620 continue;
621 }
622
623 if (r->id.idiag_sport != inet->sport &&
624 r->id.idiag_sport)
625 goto next_listen;
626
627 if (!(r->idiag_states & TCPF_LISTEN) ||
628 r->id.idiag_dport ||
629 cb->args[3] > 0)
630 goto syn_recv;
631
632 if (inet_diag_dump_sock(skb, sk, cb) < 0) {
633 inet_listen_unlock(hashinfo);
634 goto done;
635 }
636
637 syn_recv:
638 if (!(r->idiag_states & TCPF_SYN_RECV))
639 goto next_listen;
640
641 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
642 inet_listen_unlock(hashinfo);
643 goto done;
644 }
645
646 next_listen:
647 cb->args[3] = 0;
648 cb->args[4] = 0;
649 ++num;
650 }
651
652 s_num = 0;
653 cb->args[3] = 0;
654 cb->args[4] = 0;
655 }
656 inet_listen_unlock(hashinfo);
657 skip_listen_ht:
658 cb->args[0] = 1;
659 s_i = num = s_num = 0;
660 }
661
662 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
663 return skb->len;
664
665 for (i = s_i; i < hashinfo->ehash_size; i++) {
666 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
667 struct sock *sk;
668 struct hlist_node *node;
669
670 if (i > s_i)
671 s_num = 0;
672
673 read_lock_bh(&head->lock);
674
675 num = 0;
676 sk_for_each(sk, node, &head->chain) {
677 struct inet_sock *inet = inet_sk(sk);
678
679 if (num < s_num)
680 goto next_normal;
681 if (!(r->idiag_states & (1 << sk->sk_state)))
682 goto next_normal;
683 if (r->id.idiag_sport != inet->sport &&
684 r->id.idiag_sport)
685 goto next_normal;
686 if (r->id.idiag_dport != inet->dport && r->id.idiag_dport)
687 goto next_normal;
688 if (inet_diag_dump_sock(skb, sk, cb) < 0) {
689 read_unlock_bh(&head->lock);
690 goto done;
691 }
692 next_normal:
693 ++num;
694 }
695
696 if (r->idiag_states & TCPF_TIME_WAIT) {
697 sk_for_each(sk, node,
698 &hashinfo->ehash[i + hashinfo->ehash_size].chain) {
699 struct inet_sock *inet = inet_sk(sk);
700
701 if (num < s_num)
702 goto next_dying;
703 if (r->id.idiag_sport != inet->sport &&
704 r->id.idiag_sport)
705 goto next_dying;
706 if (r->id.idiag_dport != inet->dport &&
707 r->id.idiag_dport)
708 goto next_dying;
709 if (inet_diag_dump_sock(skb, sk, cb) < 0) {
710 read_unlock_bh(&head->lock);
711 goto done;
712 }
713 next_dying:
714 ++num;
715 }
716 }
717 read_unlock_bh(&head->lock);
718 }
719
720 done:
721 cb->args[1] = i;
722 cb->args[2] = num;
723 return skb->len;
724 }
725
726 static int inet_diag_dump_done(struct netlink_callback *cb)
727 {
728 return 0;
729 }
730
731
732 static __inline__ int
733 inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
734 {
735 if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
736 return 0;
737
738 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX)
739 goto err_inval;
740
741 if (inet_diag_table[nlh->nlmsg_type] == NULL)
742 return -ENOENT;
743
744 if (NLMSG_LENGTH(sizeof(struct inet_diag_req)) > skb->len)
745 goto err_inval;
746
747 if (nlh->nlmsg_flags&NLM_F_DUMP) {
748 if (nlh->nlmsg_len >
749 (4 + NLMSG_SPACE(sizeof(struct inet_diag_req)))) {
750 struct rtattr *rta = (void *)(NLMSG_DATA(nlh) +
751 sizeof(struct inet_diag_req));
752 if (rta->rta_type != INET_DIAG_REQ_BYTECODE ||
753 rta->rta_len < 8 ||
754 rta->rta_len >
755 (nlh->nlmsg_len -
756 NLMSG_SPACE(sizeof(struct inet_diag_req))))
757 goto err_inval;
758 if (inet_diag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
759 goto err_inval;
760 }
761 return netlink_dump_start(idiagnl, skb, nlh,
762 inet_diag_dump,
763 inet_diag_dump_done);
764 } else {
765 return inet_diag_get_exact(skb, nlh);
766 }
767
768 err_inval:
769 return -EINVAL;
770 }
771
772
773 static inline void inet_diag_rcv_skb(struct sk_buff *skb)
774 {
775 int err;
776 struct nlmsghdr * nlh;
777
778 if (skb->len >= NLMSG_SPACE(0)) {
779 nlh = (struct nlmsghdr *)skb->data;
780 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
781 return;
782 err = inet_diag_rcv_msg(skb, nlh);
783 if (err || nlh->nlmsg_flags & NLM_F_ACK)
784 netlink_ack(skb, nlh, err);
785 }
786 }
787
788 static void inet_diag_rcv(struct sock *sk, int len)
789 {
790 struct sk_buff *skb;
791 unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
792
793 while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
794 inet_diag_rcv_skb(skb);
795 kfree_skb(skb);
796 }
797 }
798
799 static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
800 void *_info)
801 {
802 const struct tcp_sock *tp = tcp_sk(sk);
803 struct tcp_info *info = _info;
804
805 r->idiag_rqueue = tp->rcv_nxt - tp->copied_seq;
806 r->idiag_wqueue = tp->write_seq - tp->snd_una;
807 if (info != NULL)
808 tcp_get_info(sk, info);
809 }
810
811 static struct inet_diag_handler tcp_diag_handler = {
812 .idiag_hashinfo = &tcp_hashinfo,
813 .idiag_get_info = tcp_diag_get_info,
814 .idiag_type = TCPDIAG_GETSOCK,
815 .idiag_info_size = sizeof(struct tcp_info),
816 };
817
818 static DEFINE_SPINLOCK(inet_diag_register_lock);
819
820 int inet_diag_register(const struct inet_diag_handler *h)
821 {
822 const __u16 type = h->idiag_type;
823 int err = -EINVAL;
824
825 if (type >= INET_DIAG_GETSOCK_MAX)
826 goto out;
827
828 spin_lock(&inet_diag_register_lock);
829 err = -EEXIST;
830 if (inet_diag_table[type] == NULL) {
831 inet_diag_table[type] = h;
832 err = 0;
833 }
834 spin_unlock(&inet_diag_register_lock);
835 out:
836 return err;
837 }
838 EXPORT_SYMBOL_GPL(inet_diag_register);
839
840 void inet_diag_unregister(const struct inet_diag_handler *h)
841 {
842 const __u16 type = h->idiag_type;
843
844 if (type >= INET_DIAG_GETSOCK_MAX)
845 return;
846
847 spin_lock(&inet_diag_register_lock);
848 inet_diag_table[type] = NULL;
849 spin_unlock(&inet_diag_register_lock);
850
851 synchronize_rcu();
852 }
853 EXPORT_SYMBOL_GPL(inet_diag_unregister);
854
855 static int __init inet_diag_init(void)
856 {
857 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
858 sizeof(struct inet_diag_handler *));
859 int err = -ENOMEM;
860
861 inet_diag_table = kmalloc(inet_diag_table_size, GFP_KERNEL);
862 if (!inet_diag_table)
863 goto out;
864
865 memset(inet_diag_table, 0, inet_diag_table_size);
866
867 idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, inet_diag_rcv,
868 THIS_MODULE);
869 if (idiagnl == NULL)
870 goto out_free_table;
871
872 err = inet_diag_register(&tcp_diag_handler);
873 if (err)
874 goto out_sock_release;
875 out:
876 return err;
877 out_sock_release:
878 sock_release(idiagnl->sk_socket);
879 out_free_table:
880 kfree(inet_diag_table);
881 goto out;
882 }
883
884 static void __exit inet_diag_exit(void)
885 {
886 sock_release(idiagnl->sk_socket);
887 kfree(inet_diag_table);
888 }
889
890 module_init(inet_diag_init);
891 module_exit(inet_diag_exit);
892 MODULE_LICENSE("GPL");
kernel-based virtual machine