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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux...
[mirror_ubuntu-artful-kernel.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 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
133 &np->rcv_saddr);
134 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
135 &np->daddr);
136 if (ext & (1 << (INET_DIAG_TOS - 1)))
137 RTA_PUT_U8(skb, INET_DIAG_TOS, np->tclass);
138 }
139 #endif
140
141 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
142
143 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
144 r->idiag_timer = 1;
145 r->idiag_retrans = icsk->icsk_retransmits;
146 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
147 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
148 r->idiag_timer = 4;
149 r->idiag_retrans = icsk->icsk_probes_out;
150 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
151 } else if (timer_pending(&sk->sk_timer)) {
152 r->idiag_timer = 2;
153 r->idiag_retrans = icsk->icsk_probes_out;
154 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
155 } else {
156 r->idiag_timer = 0;
157 r->idiag_expires = 0;
158 }
159 #undef EXPIRES_IN_MS
160
161 r->idiag_uid = sock_i_uid(sk);
162 r->idiag_inode = sock_i_ino(sk);
163
164 if (minfo) {
165 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
166 minfo->idiag_wmem = sk->sk_wmem_queued;
167 minfo->idiag_fmem = sk->sk_forward_alloc;
168 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
169 }
170
171 handler->idiag_get_info(sk, r, info);
172
173 if (sk->sk_state < TCP_TIME_WAIT &&
174 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
175 icsk->icsk_ca_ops->get_info(sk, ext, skb);
176
177 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
178 return skb->len;
179
180 rtattr_failure:
181 nlmsg_failure:
182 nlmsg_trim(skb, b);
183 return -EMSGSIZE;
184 }
185
186 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
187 struct sk_buff *skb, int ext, u32 pid,
188 u32 seq, u16 nlmsg_flags,
189 const struct nlmsghdr *unlh)
190 {
191 long tmo;
192 struct inet_diag_msg *r;
193 const unsigned char *previous_tail = skb_tail_pointer(skb);
194 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
195 unlh->nlmsg_type, sizeof(*r));
196
197 r = NLMSG_DATA(nlh);
198 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
199
200 nlh->nlmsg_flags = nlmsg_flags;
201
202 tmo = tw->tw_ttd - jiffies;
203 if (tmo < 0)
204 tmo = 0;
205
206 r->idiag_family = tw->tw_family;
207 r->idiag_retrans = 0;
208 r->id.idiag_if = tw->tw_bound_dev_if;
209 r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
210 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
211 r->id.idiag_sport = tw->tw_sport;
212 r->id.idiag_dport = tw->tw_dport;
213 r->id.idiag_src[0] = tw->tw_rcv_saddr;
214 r->id.idiag_dst[0] = tw->tw_daddr;
215 r->idiag_state = tw->tw_substate;
216 r->idiag_timer = 3;
217 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
218 r->idiag_rqueue = 0;
219 r->idiag_wqueue = 0;
220 r->idiag_uid = 0;
221 r->idiag_inode = 0;
222 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
223 if (tw->tw_family == AF_INET6) {
224 const struct inet6_timewait_sock *tw6 =
225 inet6_twsk((struct sock *)tw);
226
227 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
228 &tw6->tw_v6_rcv_saddr);
229 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
230 &tw6->tw_v6_daddr);
231 }
232 #endif
233 nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
234 return skb->len;
235 nlmsg_failure:
236 nlmsg_trim(skb, previous_tail);
237 return -EMSGSIZE;
238 }
239
240 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
241 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
242 const struct nlmsghdr *unlh)
243 {
244 if (sk->sk_state == TCP_TIME_WAIT)
245 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
246 skb, ext, pid, seq, nlmsg_flags,
247 unlh);
248 return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
249 }
250
251 static int inet_diag_get_exact(struct sk_buff *in_skb,
252 const struct nlmsghdr *nlh)
253 {
254 int err;
255 struct sock *sk;
256 struct inet_diag_req *req = NLMSG_DATA(nlh);
257 struct sk_buff *rep;
258 struct inet_hashinfo *hashinfo;
259 const struct inet_diag_handler *handler;
260
261 handler = inet_diag_lock_handler(nlh->nlmsg_type);
262 if (IS_ERR(handler)) {
263 err = PTR_ERR(handler);
264 goto unlock;
265 }
266
267 hashinfo = handler->idiag_hashinfo;
268 err = -EINVAL;
269
270 if (req->idiag_family == AF_INET) {
271 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
272 req->id.idiag_dport, req->id.idiag_src[0],
273 req->id.idiag_sport, req->id.idiag_if);
274 }
275 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
276 else if (req->idiag_family == AF_INET6) {
277 sk = inet6_lookup(&init_net, hashinfo,
278 (struct in6_addr *)req->id.idiag_dst,
279 req->id.idiag_dport,
280 (struct in6_addr *)req->id.idiag_src,
281 req->id.idiag_sport,
282 req->id.idiag_if);
283 }
284 #endif
285 else {
286 goto unlock;
287 }
288
289 err = -ENOENT;
290 if (sk == NULL)
291 goto unlock;
292
293 err = -ESTALE;
294 if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
295 req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
296 ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
297 (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
298 goto out;
299
300 err = -ENOMEM;
301 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
302 sizeof(struct inet_diag_meminfo) +
303 handler->idiag_info_size + 64)),
304 GFP_KERNEL);
305 if (!rep)
306 goto out;
307
308 err = sk_diag_fill(sk, rep, req->idiag_ext,
309 NETLINK_CB(in_skb).pid,
310 nlh->nlmsg_seq, 0, nlh);
311 if (err < 0) {
312 WARN_ON(err == -EMSGSIZE);
313 kfree_skb(rep);
314 goto out;
315 }
316 err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
317 MSG_DONTWAIT);
318 if (err > 0)
319 err = 0;
320
321 out:
322 if (sk) {
323 if (sk->sk_state == TCP_TIME_WAIT)
324 inet_twsk_put((struct inet_timewait_sock *)sk);
325 else
326 sock_put(sk);
327 }
328 unlock:
329 inet_diag_unlock_handler(handler);
330 return err;
331 }
332
333 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
334 {
335 int words = bits >> 5;
336
337 bits &= 0x1f;
338
339 if (words) {
340 if (memcmp(a1, a2, words << 2))
341 return 0;
342 }
343 if (bits) {
344 __be32 w1, w2;
345 __be32 mask;
346
347 w1 = a1[words];
348 w2 = a2[words];
349
350 mask = htonl((0xffffffff) << (32 - bits));
351
352 if ((w1 ^ w2) & mask)
353 return 0;
354 }
355
356 return 1;
357 }
358
359
360 static int inet_diag_bc_run(const void *bc, int len,
361 const struct inet_diag_entry *entry)
362 {
363 while (len > 0) {
364 int yes = 1;
365 const struct inet_diag_bc_op *op = bc;
366
367 switch (op->code) {
368 case INET_DIAG_BC_NOP:
369 break;
370 case INET_DIAG_BC_JMP:
371 yes = 0;
372 break;
373 case INET_DIAG_BC_S_GE:
374 yes = entry->sport >= op[1].no;
375 break;
376 case INET_DIAG_BC_S_LE:
377 yes = entry->sport <= op[1].no;
378 break;
379 case INET_DIAG_BC_D_GE:
380 yes = entry->dport >= op[1].no;
381 break;
382 case INET_DIAG_BC_D_LE:
383 yes = entry->dport <= op[1].no;
384 break;
385 case INET_DIAG_BC_AUTO:
386 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
387 break;
388 case INET_DIAG_BC_S_COND:
389 case INET_DIAG_BC_D_COND: {
390 struct inet_diag_hostcond *cond;
391 __be32 *addr;
392
393 cond = (struct inet_diag_hostcond *)(op + 1);
394 if (cond->port != -1 &&
395 cond->port != (op->code == INET_DIAG_BC_S_COND ?
396 entry->sport : entry->dport)) {
397 yes = 0;
398 break;
399 }
400
401 if (cond->prefix_len == 0)
402 break;
403
404 if (op->code == INET_DIAG_BC_S_COND)
405 addr = entry->saddr;
406 else
407 addr = entry->daddr;
408
409 if (bitstring_match(addr, cond->addr,
410 cond->prefix_len))
411 break;
412 if (entry->family == AF_INET6 &&
413 cond->family == AF_INET) {
414 if (addr[0] == 0 && addr[1] == 0 &&
415 addr[2] == htonl(0xffff) &&
416 bitstring_match(addr + 3, cond->addr,
417 cond->prefix_len))
418 break;
419 }
420 yes = 0;
421 break;
422 }
423 }
424
425 if (yes) {
426 len -= op->yes;
427 bc += op->yes;
428 } else {
429 len -= op->no;
430 bc += op->no;
431 }
432 }
433 return len == 0;
434 }
435
436 static int valid_cc(const void *bc, int len, int cc)
437 {
438 while (len >= 0) {
439 const struct inet_diag_bc_op *op = bc;
440
441 if (cc > len)
442 return 0;
443 if (cc == len)
444 return 1;
445 if (op->yes < 4 || op->yes & 3)
446 return 0;
447 len -= op->yes;
448 bc += op->yes;
449 }
450 return 0;
451 }
452
453 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
454 {
455 const void *bc = bytecode;
456 int len = bytecode_len;
457
458 while (len > 0) {
459 const struct inet_diag_bc_op *op = bc;
460
461 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
462 switch (op->code) {
463 case INET_DIAG_BC_AUTO:
464 case INET_DIAG_BC_S_COND:
465 case INET_DIAG_BC_D_COND:
466 case INET_DIAG_BC_S_GE:
467 case INET_DIAG_BC_S_LE:
468 case INET_DIAG_BC_D_GE:
469 case INET_DIAG_BC_D_LE:
470 case INET_DIAG_BC_JMP:
471 if (op->no < 4 || op->no > len + 4 || op->no & 3)
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 break;
479 default:
480 return -EINVAL;
481 }
482 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
483 return -EINVAL;
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 (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
497 struct inet_diag_entry entry;
498 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
499 sizeof(*r),
500 INET_DIAG_REQ_BYTECODE);
501 struct inet_sock *inet = inet_sk(sk);
502
503 entry.family = sk->sk_family;
504 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
505 if (entry.family == AF_INET6) {
506 struct ipv6_pinfo *np = inet6_sk(sk);
507
508 entry.saddr = np->rcv_saddr.s6_addr32;
509 entry.daddr = np->daddr.s6_addr32;
510 } else
511 #endif
512 {
513 entry.saddr = &inet->inet_rcv_saddr;
514 entry.daddr = &inet->inet_daddr;
515 }
516 entry.sport = inet->inet_num;
517 entry.dport = ntohs(inet->inet_dport);
518 entry.userlocks = sk->sk_userlocks;
519
520 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
521 return 0;
522 }
523
524 return inet_csk_diag_fill(sk, skb, r->idiag_ext,
525 NETLINK_CB(cb->skb).pid,
526 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
527 }
528
529 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
530 struct sk_buff *skb,
531 struct netlink_callback *cb)
532 {
533 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
534
535 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
536 struct inet_diag_entry entry;
537 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
538 sizeof(*r),
539 INET_DIAG_REQ_BYTECODE);
540
541 entry.family = tw->tw_family;
542 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
543 if (tw->tw_family == AF_INET6) {
544 struct inet6_timewait_sock *tw6 =
545 inet6_twsk((struct sock *)tw);
546 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
547 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
548 } else
549 #endif
550 {
551 entry.saddr = &tw->tw_rcv_saddr;
552 entry.daddr = &tw->tw_daddr;
553 }
554 entry.sport = tw->tw_num;
555 entry.dport = ntohs(tw->tw_dport);
556 entry.userlocks = 0;
557
558 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
559 return 0;
560 }
561
562 return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
563 NETLINK_CB(cb->skb).pid,
564 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
565 }
566
567 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
568 struct request_sock *req, u32 pid, u32 seq,
569 const struct nlmsghdr *unlh)
570 {
571 const struct inet_request_sock *ireq = inet_rsk(req);
572 struct inet_sock *inet = inet_sk(sk);
573 unsigned char *b = skb_tail_pointer(skb);
574 struct inet_diag_msg *r;
575 struct nlmsghdr *nlh;
576 long tmo;
577
578 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
579 nlh->nlmsg_flags = NLM_F_MULTI;
580 r = NLMSG_DATA(nlh);
581
582 r->idiag_family = sk->sk_family;
583 r->idiag_state = TCP_SYN_RECV;
584 r->idiag_timer = 1;
585 r->idiag_retrans = req->retrans;
586
587 r->id.idiag_if = sk->sk_bound_dev_if;
588 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
589 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
590
591 tmo = req->expires - jiffies;
592 if (tmo < 0)
593 tmo = 0;
594
595 r->id.idiag_sport = inet->inet_sport;
596 r->id.idiag_dport = ireq->rmt_port;
597 r->id.idiag_src[0] = ireq->loc_addr;
598 r->id.idiag_dst[0] = ireq->rmt_addr;
599 r->idiag_expires = jiffies_to_msecs(tmo);
600 r->idiag_rqueue = 0;
601 r->idiag_wqueue = 0;
602 r->idiag_uid = sock_i_uid(sk);
603 r->idiag_inode = 0;
604 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
605 if (r->idiag_family == AF_INET6) {
606 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
607 &inet6_rsk(req)->loc_addr);
608 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
609 &inet6_rsk(req)->rmt_addr);
610 }
611 #endif
612 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
613
614 return skb->len;
615
616 nlmsg_failure:
617 nlmsg_trim(skb, b);
618 return -1;
619 }
620
621 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
622 struct netlink_callback *cb)
623 {
624 struct inet_diag_entry entry;
625 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
626 struct inet_connection_sock *icsk = inet_csk(sk);
627 struct listen_sock *lopt;
628 const struct nlattr *bc = NULL;
629 struct inet_sock *inet = inet_sk(sk);
630 int j, s_j;
631 int reqnum, s_reqnum;
632 int err = 0;
633
634 s_j = cb->args[3];
635 s_reqnum = cb->args[4];
636
637 if (s_j > 0)
638 s_j--;
639
640 entry.family = sk->sk_family;
641
642 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
643
644 lopt = icsk->icsk_accept_queue.listen_opt;
645 if (!lopt || !lopt->qlen)
646 goto out;
647
648 if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
649 bc = nlmsg_find_attr(cb->nlh, sizeof(*r),
650 INET_DIAG_REQ_BYTECODE);
651 entry.sport = inet->inet_num;
652 entry.userlocks = sk->sk_userlocks;
653 }
654
655 for (j = s_j; j < lopt->nr_table_entries; j++) {
656 struct request_sock *req, *head = lopt->syn_table[j];
657
658 reqnum = 0;
659 for (req = head; req; reqnum++, req = req->dl_next) {
660 struct inet_request_sock *ireq = inet_rsk(req);
661
662 if (reqnum < s_reqnum)
663 continue;
664 if (r->id.idiag_dport != ireq->rmt_port &&
665 r->id.idiag_dport)
666 continue;
667
668 if (bc) {
669 entry.saddr =
670 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
671 (entry.family == AF_INET6) ?
672 inet6_rsk(req)->loc_addr.s6_addr32 :
673 #endif
674 &ireq->loc_addr;
675 entry.daddr =
676 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
677 (entry.family == AF_INET6) ?
678 inet6_rsk(req)->rmt_addr.s6_addr32 :
679 #endif
680 &ireq->rmt_addr;
681 entry.dport = ntohs(ireq->rmt_port);
682
683 if (!inet_diag_bc_run(nla_data(bc),
684 nla_len(bc), &entry))
685 continue;
686 }
687
688 err = inet_diag_fill_req(skb, sk, req,
689 NETLINK_CB(cb->skb).pid,
690 cb->nlh->nlmsg_seq, cb->nlh);
691 if (err < 0) {
692 cb->args[3] = j + 1;
693 cb->args[4] = reqnum;
694 goto out;
695 }
696 }
697
698 s_reqnum = 0;
699 }
700
701 out:
702 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
703
704 return err;
705 }
706
707 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
708 {
709 int i, num;
710 int s_i, s_num;
711 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
712 const struct inet_diag_handler *handler;
713 struct inet_hashinfo *hashinfo;
714
715 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
716 if (IS_ERR(handler))
717 goto unlock;
718
719 hashinfo = handler->idiag_hashinfo;
720
721 s_i = cb->args[1];
722 s_num = num = cb->args[2];
723
724 if (cb->args[0] == 0) {
725 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
726 goto skip_listen_ht;
727
728 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
729 struct sock *sk;
730 struct hlist_nulls_node *node;
731 struct inet_listen_hashbucket *ilb;
732
733 num = 0;
734 ilb = &hashinfo->listening_hash[i];
735 spin_lock_bh(&ilb->lock);
736 sk_nulls_for_each(sk, node, &ilb->head) {
737 struct inet_sock *inet = inet_sk(sk);
738
739 if (num < s_num) {
740 num++;
741 continue;
742 }
743
744 if (r->id.idiag_sport != inet->inet_sport &&
745 r->id.idiag_sport)
746 goto next_listen;
747
748 if (!(r->idiag_states & TCPF_LISTEN) ||
749 r->id.idiag_dport ||
750 cb->args[3] > 0)
751 goto syn_recv;
752
753 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
754 spin_unlock_bh(&ilb->lock);
755 goto done;
756 }
757
758 syn_recv:
759 if (!(r->idiag_states & TCPF_SYN_RECV))
760 goto next_listen;
761
762 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
763 spin_unlock_bh(&ilb->lock);
764 goto done;
765 }
766
767 next_listen:
768 cb->args[3] = 0;
769 cb->args[4] = 0;
770 ++num;
771 }
772 spin_unlock_bh(&ilb->lock);
773
774 s_num = 0;
775 cb->args[3] = 0;
776 cb->args[4] = 0;
777 }
778 skip_listen_ht:
779 cb->args[0] = 1;
780 s_i = num = s_num = 0;
781 }
782
783 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
784 goto unlock;
785
786 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
787 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
788 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
789 struct sock *sk;
790 struct hlist_nulls_node *node;
791
792 num = 0;
793
794 if (hlist_nulls_empty(&head->chain) &&
795 hlist_nulls_empty(&head->twchain))
796 continue;
797
798 if (i > s_i)
799 s_num = 0;
800
801 spin_lock_bh(lock);
802 sk_nulls_for_each(sk, node, &head->chain) {
803 struct inet_sock *inet = inet_sk(sk);
804
805 if (num < s_num)
806 goto next_normal;
807 if (!(r->idiag_states & (1 << sk->sk_state)))
808 goto next_normal;
809 if (r->id.idiag_sport != inet->inet_sport &&
810 r->id.idiag_sport)
811 goto next_normal;
812 if (r->id.idiag_dport != inet->inet_dport &&
813 r->id.idiag_dport)
814 goto next_normal;
815 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
816 spin_unlock_bh(lock);
817 goto done;
818 }
819 next_normal:
820 ++num;
821 }
822
823 if (r->idiag_states & TCPF_TIME_WAIT) {
824 struct inet_timewait_sock *tw;
825
826 inet_twsk_for_each(tw, node,
827 &head->twchain) {
828
829 if (num < s_num)
830 goto next_dying;
831 if (r->id.idiag_sport != tw->tw_sport &&
832 r->id.idiag_sport)
833 goto next_dying;
834 if (r->id.idiag_dport != tw->tw_dport &&
835 r->id.idiag_dport)
836 goto next_dying;
837 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
838 spin_unlock_bh(lock);
839 goto done;
840 }
841 next_dying:
842 ++num;
843 }
844 }
845 spin_unlock_bh(lock);
846 }
847
848 done:
849 cb->args[1] = i;
850 cb->args[2] = num;
851 unlock:
852 inet_diag_unlock_handler(handler);
853 return skb->len;
854 }
855
856 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
857 {
858 int hdrlen = sizeof(struct inet_diag_req);
859
860 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
861 nlmsg_len(nlh) < hdrlen)
862 return -EINVAL;
863
864 if (nlh->nlmsg_flags & NLM_F_DUMP) {
865 if (nlmsg_attrlen(nlh, hdrlen)) {
866 struct nlattr *attr;
867
868 attr = nlmsg_find_attr(nlh, hdrlen,
869 INET_DIAG_REQ_BYTECODE);
870 if (attr == NULL ||
871 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
872 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
873 return -EINVAL;
874 }
875
876 return netlink_dump_start(idiagnl, skb, nlh,
877 inet_diag_dump, NULL, 0);
878 }
879
880 return inet_diag_get_exact(skb, nlh);
881 }
882
883 static DEFINE_MUTEX(inet_diag_mutex);
884
885 static void inet_diag_rcv(struct sk_buff *skb)
886 {
887 mutex_lock(&inet_diag_mutex);
888 netlink_rcv_skb(skb, &inet_diag_rcv_msg);
889 mutex_unlock(&inet_diag_mutex);
890 }
891
892 int inet_diag_register(const struct inet_diag_handler *h)
893 {
894 const __u16 type = h->idiag_type;
895 int err = -EINVAL;
896
897 if (type >= INET_DIAG_GETSOCK_MAX)
898 goto out;
899
900 mutex_lock(&inet_diag_table_mutex);
901 err = -EEXIST;
902 if (inet_diag_table[type] == NULL) {
903 inet_diag_table[type] = h;
904 err = 0;
905 }
906 mutex_unlock(&inet_diag_table_mutex);
907 out:
908 return err;
909 }
910 EXPORT_SYMBOL_GPL(inet_diag_register);
911
912 void inet_diag_unregister(const struct inet_diag_handler *h)
913 {
914 const __u16 type = h->idiag_type;
915
916 if (type >= INET_DIAG_GETSOCK_MAX)
917 return;
918
919 mutex_lock(&inet_diag_table_mutex);
920 inet_diag_table[type] = NULL;
921 mutex_unlock(&inet_diag_table_mutex);
922 }
923 EXPORT_SYMBOL_GPL(inet_diag_unregister);
924
925 static int __init inet_diag_init(void)
926 {
927 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
928 sizeof(struct inet_diag_handler *));
929 int err = -ENOMEM;
930
931 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
932 if (!inet_diag_table)
933 goto out;
934
935 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
936 inet_diag_rcv, NULL, THIS_MODULE);
937 if (idiagnl == NULL)
938 goto out_free_table;
939 err = 0;
940 out:
941 return err;
942 out_free_table:
943 kfree(inet_diag_table);
944 goto out;
945 }
946
947 static void __exit inet_diag_exit(void)
948 {
949 netlink_kernel_release(idiagnl);
950 kfree(inet_diag_table);
951 }
952
953 module_init(inet_diag_init);
954 module_exit(inet_diag_exit);
955 MODULE_LICENSE("GPL");
956 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);
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