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Merge branch 'for_david' of git://git.open-mesh.org/linux-merge
[deliverable/linux.git] / net / ipv4 / inet_diag.c
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 if ((ext & (1 << (INET_DIAG_TOS - 1))) && (sk->sk_family != AF_INET6))
112 RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos);
113
114 r->idiag_family = sk->sk_family;
115 r->idiag_state = sk->sk_state;
116 r->idiag_timer = 0;
117 r->idiag_retrans = 0;
118
119 r->id.idiag_if = sk->sk_bound_dev_if;
120 r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
121 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
122
123 r->id.idiag_sport = inet->inet_sport;
124 r->id.idiag_dport = inet->inet_dport;
125 r->id.idiag_src[0] = inet->inet_rcv_saddr;
126 r->id.idiag_dst[0] = inet->inet_daddr;
127
128 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
129 if (r->idiag_family == AF_INET6) {
130 const struct ipv6_pinfo *np = inet6_sk(sk);
131
132 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
133 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
134 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
135 RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass);
136 }
137 #endif
138
139 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
140
141 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
142 r->idiag_timer = 1;
143 r->idiag_retrans = icsk->icsk_retransmits;
144 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
145 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
146 r->idiag_timer = 4;
147 r->idiag_retrans = icsk->icsk_probes_out;
148 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
149 } else if (timer_pending(&sk->sk_timer)) {
150 r->idiag_timer = 2;
151 r->idiag_retrans = icsk->icsk_probes_out;
152 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
153 } else {
154 r->idiag_timer = 0;
155 r->idiag_expires = 0;
156 }
157 #undef EXPIRES_IN_MS
158
159 r->idiag_uid = sock_i_uid(sk);
160 r->idiag_inode = sock_i_ino(sk);
161
162 if (minfo) {
163 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
164 minfo->idiag_wmem = sk->sk_wmem_queued;
165 minfo->idiag_fmem = sk->sk_forward_alloc;
166 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
167 }
168
169 handler->idiag_get_info(sk, r, info);
170
171 if (sk->sk_state < TCP_TIME_WAIT &&
172 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
173 icsk->icsk_ca_ops->get_info(sk, ext, skb);
174
175 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
176 return skb->len;
177
178 rtattr_failure:
179 nlmsg_failure:
180 nlmsg_trim(skb, b);
181 return -EMSGSIZE;
182 }
183
184 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
185 struct sk_buff *skb, int ext, u32 pid,
186 u32 seq, u16 nlmsg_flags,
187 const struct nlmsghdr *unlh)
188 {
189 long tmo;
190 struct inet_diag_msg *r;
191 const unsigned char *previous_tail = skb_tail_pointer(skb);
192 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
193 unlh->nlmsg_type, sizeof(*r));
194
195 r = NLMSG_DATA(nlh);
196 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
197
198 nlh->nlmsg_flags = nlmsg_flags;
199
200 tmo = tw->tw_ttd - jiffies;
201 if (tmo < 0)
202 tmo = 0;
203
204 r->idiag_family = tw->tw_family;
205 r->idiag_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 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
226 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
227 }
228 #endif
229 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
230 return skb->len;
231 nlmsg_failure:
232 nlmsg_trim(skb, previous_tail);
233 return -EMSGSIZE;
234 }
235
236 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
237 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
238 const struct nlmsghdr *unlh)
239 {
240 if (sk->sk_state == TCP_TIME_WAIT)
241 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
242 skb, ext, pid, seq, nlmsg_flags,
243 unlh);
244 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
245 }
246
247 static int inet_diag_get_exact(struct sk_buff *in_skb,
248 const struct nlmsghdr *nlh)
249 {
250 int err;
251 struct sock *sk;
252 struct inet_diag_req *req = NLMSG_DATA(nlh);
253 struct sk_buff *rep;
254 struct inet_hashinfo *hashinfo;
255 const struct inet_diag_handler *handler;
256
257 handler = inet_diag_lock_handler(nlh->nlmsg_type);
258 if (IS_ERR(handler)) {
259 err = PTR_ERR(handler);
260 goto unlock;
261 }
262
263 hashinfo = handler->idiag_hashinfo;
264 err = -EINVAL;
265
266 if (req->idiag_family == AF_INET) {
267 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
268 req->id.idiag_dport, req->id.idiag_src[0],
269 req->id.idiag_sport, req->id.idiag_if);
270 }
271 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
272 else if (req->idiag_family == AF_INET6) {
273 sk = inet6_lookup(&init_net, hashinfo,
274 (struct in6_addr *)req->id.idiag_dst,
275 req->id.idiag_dport,
276 (struct in6_addr *)req->id.idiag_src,
277 req->id.idiag_sport,
278 req->id.idiag_if);
279 }
280 #endif
281 else {
282 goto unlock;
283 }
284
285 err = -ENOENT;
286 if (sk == NULL)
287 goto unlock;
288
289 err = -ESTALE;
290 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
291 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
292 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
293 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
294 goto out;
295
296 err = -ENOMEM;
297 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
298 sizeof(struct inet_diag_meminfo) +
299 handler->idiag_info_size + 64)),
300 GFP_KERNEL);
301 if (!rep)
302 goto out;
303
304 err = sk_diag_fill(sk, rep, req->idiag_ext,
305 NETLINK_CB(in_skb).pid,
306 nlh->nlmsg_seq, 0, nlh);
307 if (err < 0) {
308 WARN_ON(err == -EMSGSIZE);
309 kfree_skb(rep);
310 goto out;
311 }
312 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
313 MSG_DONTWAIT);
314 if (err > 0)
315 err = 0;
316
317 out:
318 if (sk) {
319 if (sk->sk_state == TCP_TIME_WAIT)
320 inet_twsk_put((struct inet_timewait_sock *)sk);
321 else
322 sock_put(sk);
323 }
324 unlock:
325 inet_diag_unlock_handler(handler);
326 return err;
327 }
328
329 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
330 {
331 int words = bits >> 5;
332
333 bits &= 0x1f;
334
335 if (words) {
336 if (memcmp(a1, a2, words << 2))
337 return 0;
338 }
339 if (bits) {
340 __be32 w1, w2;
341 __be32 mask;
342
343 w1 = a1[words];
344 w2 = a2[words];
345
346 mask = htonl((0xffffffff) << (32 - bits));
347
348 if ((w1 ^ w2) & mask)
349 return 0;
350 }
351
352 return 1;
353 }
354
355
356 static int inet_diag_bc_run(const void *bc, int len,
357 const struct inet_diag_entry *entry)
358 {
359 while (len > 0) {
360 int yes = 1;
361 const struct inet_diag_bc_op *op = bc;
362
363 switch (op->code) {
364 case INET_DIAG_BC_NOP:
365 break;
366 case INET_DIAG_BC_JMP:
367 yes = 0;
368 break;
369 case INET_DIAG_BC_S_GE:
370 yes = entry->sport >= op[1].no;
371 break;
372 case INET_DIAG_BC_S_LE:
373 yes = entry->sport <= op[1].no;
374 break;
375 case INET_DIAG_BC_D_GE:
376 yes = entry->dport >= op[1].no;
377 break;
378 case INET_DIAG_BC_D_LE:
379 yes = entry->dport <= op[1].no;
380 break;
381 case INET_DIAG_BC_AUTO:
382 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
383 break;
384 case INET_DIAG_BC_S_COND:
385 case INET_DIAG_BC_D_COND: {
386 struct inet_diag_hostcond *cond;
387 __be32 *addr;
388
389 cond = (struct inet_diag_hostcond *)(op + 1);
390 if (cond->port != -1 &&
391 cond->port != (op->code == INET_DIAG_BC_S_COND ?
392 entry->sport : entry->dport)) {
393 yes = 0;
394 break;
395 }
396
397 if (cond->prefix_len == 0)
398 break;
399
400 if (op->code == INET_DIAG_BC_S_COND)
401 addr = entry->saddr;
402 else
403 addr = entry->daddr;
404
405 if (bitstring_match(addr, cond->addr,
406 cond->prefix_len))
407 break;
408 if (entry->family == AF_INET6 &&
409 cond->family == AF_INET) {
410 if (addr[0] == 0 && addr[1] == 0 &&
411 addr[2] == htonl(0xffff) &&
412 bitstring_match(addr + 3, cond->addr,
413 cond->prefix_len))
414 break;
415 }
416 yes = 0;
417 break;
418 }
419 }
420
421 if (yes) {
422 len -= op->yes;
423 bc += op->yes;
424 } else {
425 len -= op->no;
426 bc += op->no;
427 }
428 }
429 return len == 0;
430 }
431
432 static int valid_cc(const void *bc, int len, int cc)
433 {
434 while (len >= 0) {
435 const struct inet_diag_bc_op *op = bc;
436
437 if (cc > len)
438 return 0;
439 if (cc == len)
440 return 1;
441 if (op->yes < 4 || op->yes & 3)
442 return 0;
443 len -= op->yes;
444 bc += op->yes;
445 }
446 return 0;
447 }
448
449 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
450 {
451 const void *bc = bytecode;
452 int len = bytecode_len;
453
454 while (len > 0) {
455 const struct inet_diag_bc_op *op = bc;
456
457 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
458 switch (op->code) {
459 case INET_DIAG_BC_AUTO:
460 case INET_DIAG_BC_S_COND:
461 case INET_DIAG_BC_D_COND:
462 case INET_DIAG_BC_S_GE:
463 case INET_DIAG_BC_S_LE:
464 case INET_DIAG_BC_D_GE:
465 case INET_DIAG_BC_D_LE:
466 case INET_DIAG_BC_JMP:
467 if (op->no < 4 || op->no > len + 4 || op->no & 3)
468 return -EINVAL;
469 if (op->no < len &&
470 !valid_cc(bytecode, bytecode_len, len - op->no))
471 return -EINVAL;
472 break;
473 case INET_DIAG_BC_NOP:
474 break;
475 default:
476 return -EINVAL;
477 }
478 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
479 return -EINVAL;
480 bc += op->yes;
481 len -= op->yes;
482 }
483 return len == 0 ? 0 : -EINVAL;
484 }
485
486 static int inet_csk_diag_dump(struct sock *sk,
487 struct sk_buff *skb,
488 struct netlink_callback *cb)
489 {
490 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
491
492 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
493 struct inet_diag_entry entry;
494 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
495 sizeof(*r),
496 INET_DIAG_REQ_BYTECODE);
497 struct inet_sock *inet = inet_sk(sk);
498
499 entry.family = sk->sk_family;
500 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
501 if (entry.family == AF_INET6) {
502 struct ipv6_pinfo *np = inet6_sk(sk);
503
504 entry.saddr = np->rcv_saddr.s6_addr32;
505 entry.daddr = np->daddr.s6_addr32;
506 } else
507 #endif
508 {
509 entry.saddr = &inet->inet_rcv_saddr;
510 entry.daddr = &inet->inet_daddr;
511 }
512 entry.sport = inet->inet_num;
513 entry.dport = ntohs(inet->inet_dport);
514 entry.userlocks = sk->sk_userlocks;
515
516 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
517 return 0;
518 }
519
520 return inet_csk_diag_fill(sk, skb, r->idiag_ext,
521 NETLINK_CB(cb->skb).pid,
522 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
523 }
524
525 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
526 struct sk_buff *skb,
527 struct netlink_callback *cb)
528 {
529 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
530
531 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
532 struct inet_diag_entry entry;
533 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
534 sizeof(*r),
535 INET_DIAG_REQ_BYTECODE);
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(nla_data(bc), nla_len(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->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 *(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr;
603 *(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
604 }
605 #endif
606 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
607
608 return skb->len;
609
610 nlmsg_failure:
611 nlmsg_trim(skb, b);
612 return -1;
613 }
614
615 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
616 struct netlink_callback *cb)
617 {
618 struct inet_diag_entry entry;
619 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
620 struct inet_connection_sock *icsk = inet_csk(sk);
621 struct listen_sock *lopt;
622 const struct nlattr *bc = NULL;
623 struct inet_sock *inet = inet_sk(sk);
624 int j, s_j;
625 int reqnum, s_reqnum;
626 int err = 0;
627
628 s_j = cb->args[3];
629 s_reqnum = cb->args[4];
630
631 if (s_j > 0)
632 s_j--;
633
634 entry.family = sk->sk_family;
635
636 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
637
638 lopt = icsk->icsk_accept_queue.listen_opt;
639 if (!lopt || !lopt->qlen)
640 goto out;
641
642 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
643 bc = nlmsg_find_attr(cb->nlh, sizeof(*r),
644 INET_DIAG_REQ_BYTECODE);
645 entry.sport = inet->inet_num;
646 entry.userlocks = sk->sk_userlocks;
647 }
648
649 for (j = s_j; j < lopt->nr_table_entries; j++) {
650 struct request_sock *req, *head = lopt->syn_table[j];
651
652 reqnum = 0;
653 for (req = head; req; reqnum++, req = req->dl_next) {
654 struct inet_request_sock *ireq = inet_rsk(req);
655
656 if (reqnum < s_reqnum)
657 continue;
658 if (r->id.idiag_dport != ireq->rmt_port &&
659 r->id.idiag_dport)
660 continue;
661
662 if (bc) {
663 entry.saddr =
664 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
665 (entry.family == AF_INET6) ?
666 inet6_rsk(req)->loc_addr.s6_addr32 :
667 #endif
668 &ireq->loc_addr;
669 entry.daddr =
670 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
671 (entry.family == AF_INET6) ?
672 inet6_rsk(req)->rmt_addr.s6_addr32 :
673 #endif
674 &ireq->rmt_addr;
675 entry.dport = ntohs(ireq->rmt_port);
676
677 if (!inet_diag_bc_run(nla_data(bc),
678 nla_len(bc), &entry))
679 continue;
680 }
681
682 err = inet_diag_fill_req(skb, sk, req,
683 NETLINK_CB(cb->skb).pid,
684 cb->nlh->nlmsg_seq, cb->nlh);
685 if (err < 0) {
686 cb->args[3] = j + 1;
687 cb->args[4] = reqnum;
688 goto out;
689 }
690 }
691
692 s_reqnum = 0;
693 }
694
695 out:
696 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
697
698 return err;
699 }
700
701 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
702 {
703 int i, num;
704 int s_i, s_num;
705 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
706 const struct inet_diag_handler *handler;
707 struct inet_hashinfo *hashinfo;
708
709 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
710 if (IS_ERR(handler))
711 goto unlock;
712
713 hashinfo = handler->idiag_hashinfo;
714
715 s_i = cb->args[1];
716 s_num = num = cb->args[2];
717
718 if (cb->args[0] == 0) {
719 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
720 goto skip_listen_ht;
721
722 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
723 struct sock *sk;
724 struct hlist_nulls_node *node;
725 struct inet_listen_hashbucket *ilb;
726
727 num = 0;
728 ilb = &hashinfo->listening_hash[i];
729 spin_lock_bh(&ilb->lock);
730 sk_nulls_for_each(sk, node, &ilb->head) {
731 struct inet_sock *inet = inet_sk(sk);
732
733 if (num < s_num) {
734 num++;
735 continue;
736 }
737
738 if (r->id.idiag_sport != inet->inet_sport &&
739 r->id.idiag_sport)
740 goto next_listen;
741
742 if (!(r->idiag_states & TCPF_LISTEN) ||
743 r->id.idiag_dport ||
744 cb->args[3] > 0)
745 goto syn_recv;
746
747 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
748 spin_unlock_bh(&ilb->lock);
749 goto done;
750 }
751
752 syn_recv:
753 if (!(r->idiag_states & TCPF_SYN_RECV))
754 goto next_listen;
755
756 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
757 spin_unlock_bh(&ilb->lock);
758 goto done;
759 }
760
761 next_listen:
762 cb->args[3] = 0;
763 cb->args[4] = 0;
764 ++num;
765 }
766 spin_unlock_bh(&ilb->lock);
767
768 s_num = 0;
769 cb->args[3] = 0;
770 cb->args[4] = 0;
771 }
772 skip_listen_ht:
773 cb->args[0] = 1;
774 s_i = num = s_num = 0;
775 }
776
777 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
778 goto unlock;
779
780 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
781 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
782 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
783 struct sock *sk;
784 struct hlist_nulls_node *node;
785
786 num = 0;
787
788 if (hlist_nulls_empty(&head->chain) &&
789 hlist_nulls_empty(&head->twchain))
790 continue;
791
792 if (i > s_i)
793 s_num = 0;
794
795 spin_lock_bh(lock);
796 sk_nulls_for_each(sk, node, &head->chain) {
797 struct inet_sock *inet = inet_sk(sk);
798
799 if (num < s_num)
800 goto next_normal;
801 if (!(r->idiag_states & (1 << sk->sk_state)))
802 goto next_normal;
803 if (r->id.idiag_sport != inet->inet_sport &&
804 r->id.idiag_sport)
805 goto next_normal;
806 if (r->id.idiag_dport != inet->inet_dport &&
807 r->id.idiag_dport)
808 goto next_normal;
809 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
810 spin_unlock_bh(lock);
811 goto done;
812 }
813 next_normal:
814 ++num;
815 }
816
817 if (r->idiag_states & TCPF_TIME_WAIT) {
818 struct inet_timewait_sock *tw;
819
820 inet_twsk_for_each(tw, node,
821 &head->twchain) {
822
823 if (num < s_num)
824 goto next_dying;
825 if (r->id.idiag_sport != tw->tw_sport &&
826 r->id.idiag_sport)
827 goto next_dying;
828 if (r->id.idiag_dport != tw->tw_dport &&
829 r->id.idiag_dport)
830 goto next_dying;
831 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
832 spin_unlock_bh(lock);
833 goto done;
834 }
835 next_dying:
836 ++num;
837 }
838 }
839 spin_unlock_bh(lock);
840 }
841
842 done:
843 cb->args[1] = i;
844 cb->args[2] = num;
845 unlock:
846 inet_diag_unlock_handler(handler);
847 return skb->len;
848 }
849
850 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
851 {
852 int hdrlen = sizeof(struct inet_diag_req);
853
854 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
855 nlmsg_len(nlh) < hdrlen)
856 return -EINVAL;
857
858 if (nlh->nlmsg_flags & NLM_F_DUMP) {
859 if (nlmsg_attrlen(nlh, hdrlen)) {
860 struct nlattr *attr;
861
862 attr = nlmsg_find_attr(nlh, hdrlen,
863 INET_DIAG_REQ_BYTECODE);
864 if (attr == NULL ||
865 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
866 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
867 return -EINVAL;
868 }
869
870 return netlink_dump_start(idiagnl, skb, nlh,
871 inet_diag_dump, NULL, 0);
872 }
873
874 return inet_diag_get_exact(skb, nlh);
875 }
876
877 static DEFINE_MUTEX(inet_diag_mutex);
878
879 static void inet_diag_rcv(struct sk_buff *skb)
880 {
881 mutex_lock(&inet_diag_mutex);
882 netlink_rcv_skb(skb, &inet_diag_rcv_msg);
883 mutex_unlock(&inet_diag_mutex);
884 }
885
886 int inet_diag_register(const struct inet_diag_handler *h)
887 {
888 const __u16 type = h->idiag_type;
889 int err = -EINVAL;
890
891 if (type >= INET_DIAG_GETSOCK_MAX)
892 goto out;
893
894 mutex_lock(&inet_diag_table_mutex);
895 err = -EEXIST;
896 if (inet_diag_table[type] == NULL) {
897 inet_diag_table[type] = h;
898 err = 0;
899 }
900 mutex_unlock(&inet_diag_table_mutex);
901 out:
902 return err;
903 }
904 EXPORT_SYMBOL_GPL(inet_diag_register);
905
906 void inet_diag_unregister(const struct inet_diag_handler *h)
907 {
908 const __u16 type = h->idiag_type;
909
910 if (type >= INET_DIAG_GETSOCK_MAX)
911 return;
912
913 mutex_lock(&inet_diag_table_mutex);
914 inet_diag_table[type] = NULL;
915 mutex_unlock(&inet_diag_table_mutex);
916 }
917 EXPORT_SYMBOL_GPL(inet_diag_unregister);
918
919 static int __init inet_diag_init(void)
920 {
921 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
922 sizeof(struct inet_diag_handler *));
923 int err = -ENOMEM;
924
925 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
926 if (!inet_diag_table)
927 goto out;
928
929 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
930 inet_diag_rcv, NULL, THIS_MODULE);
931 if (idiagnl == NULL)
932 goto out_free_table;
933 err = 0;
934 out:
935 return err;
936 out_free_table:
937 kfree(inet_diag_table);
938 goto out;
939 }
940
941 static void __exit inet_diag_exit(void)
942 {
943 netlink_kernel_release(idiagnl);
944 kfree(inet_diag_table);
945 }
946
947 module_init(inet_diag_init);
948 module_exit(inet_diag_exit);
949 MODULE_LICENSE("GPL");
950 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);
Linux kernel - Deliverables
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