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[linux-rt-nao.git] / net / ipv4 / inet_diag.c
blob588a7796e3e3e67ea7a4c2e627e0b557f2bd2e59
1 /*
2 * inet_diag.c Module for monitoring INET transport protocols sockets.
3 *
4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/fcntl.h>
16 #include <linux/random.h>
17 #include <linux/cache.h>
18 #include <linux/init.h>
19 #include <linux/time.h>
20
21 #include <net/icmp.h>
22 #include <net/tcp.h>
23 #include <net/ipv6.h>
24 #include <net/inet_common.h>
25 #include <net/inet_connection_sock.h>
26 #include <net/inet_hashtables.h>
27 #include <net/inet_timewait_sock.h>
28 #include <net/inet6_hashtables.h>
29 #include <net/netlink.h>
30
31 #include <linux/inet.h>
32 #include <linux/stddef.h>
33
34 #include <linux/inet_diag.h>
35
36 static const struct inet_diag_handler **inet_diag_table;
37
38 struct inet_diag_entry {
39 __be32 *saddr;
40 __be32 *daddr;
41 u16 sport;
42 u16 dport;
43 u16 family;
44 u16 userlocks;
45 };
46
47 static struct sock *idiagnl;
48
49 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
50 RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
51
52 static DEFINE_MUTEX(inet_diag_table_mutex);
53
54 static const struct inet_diag_handler *inet_diag_lock_handler(int type)
55 {
56 if (!inet_diag_table[type])
57 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
58 NETLINK_INET_DIAG, type);
59
60 mutex_lock(&inet_diag_table_mutex);
61 if (!inet_diag_table[type])
62 return ERR_PTR(-ENOENT);
63
64 return inet_diag_table[type];
65 }
66
67 static inline void inet_diag_unlock_handler(
68 const struct inet_diag_handler *handler)
69 {
70 mutex_unlock(&inet_diag_table_mutex);
71 }
72
73 static int inet_csk_diag_fill(struct sock *sk,
74 struct sk_buff *skb,
75 int ext, u32 pid, u32 seq, u16 nlmsg_flags,
76 const struct nlmsghdr *unlh)
77 {
78 const struct inet_sock *inet = inet_sk(sk);
79 const struct inet_connection_sock *icsk = inet_csk(sk);
80 struct inet_diag_msg *r;
81 struct nlmsghdr *nlh;
82 void *info = NULL;
83 struct inet_diag_meminfo *minfo = NULL;
84 unsigned char *b = skb_tail_pointer(skb);
85 const struct inet_diag_handler *handler;
86
87 handler = inet_diag_table[unlh->nlmsg_type];
88 BUG_ON(handler == NULL);
89
90 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
91 nlh->nlmsg_flags = nlmsg_flags;
92
93 r = NLMSG_DATA(nlh);
94 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
95
96 if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
97 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
98
99 if (ext & (1 << (INET_DIAG_INFO - 1)))
100 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
101 handler->idiag_info_size);
102
103 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
104 const size_t len = strlen(icsk->icsk_ca_ops->name);
105
106 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
107 icsk->icsk_ca_ops->name);
108 }
109
110 r->idiag_family = sk->sk_family;
111 r->idiag_state = sk->sk_state;
112 r->idiag_timer = 0;
113 r->idiag_retrans = 0;
114
115 r->id.idiag_if = sk->sk_bound_dev_if;
116 r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
117 r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
118
119 r->id.idiag_sport = inet->sport;
120 r->id.idiag_dport = inet->dport;
121 r->id.idiag_src[0] = inet->rcv_saddr;
122 r->id.idiag_dst[0] = inet->daddr;
123
124 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
125 if (r->idiag_family == AF_INET6) {
126 struct ipv6_pinfo *np = inet6_sk(sk);
127
128 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
129 &np->rcv_saddr);
130 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
131 &np->daddr);
132 }
133 #endif
134
135 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
136
137 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
138 r->idiag_timer = 1;
139 r->idiag_retrans = icsk->icsk_retransmits;
140 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
141 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
142 r->idiag_timer = 4;
143 r->idiag_retrans = icsk->icsk_probes_out;
144 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
145 } else if (timer_pending(&sk->sk_timer)) {
146 r->idiag_timer = 2;
147 r->idiag_retrans = icsk->icsk_probes_out;
148 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
149 } else {
150 r->idiag_timer = 0;
151 r->idiag_expires = 0;
152 }
153 #undef EXPIRES_IN_MS
154
155 r->idiag_uid = sock_i_uid(sk);
156 r->idiag_inode = sock_i_ino(sk);
157
158 if (minfo) {
159 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
160 minfo->idiag_wmem = sk->sk_wmem_queued;
161 minfo->idiag_fmem = sk->sk_forward_alloc;
162 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
163 }
164
165 handler->idiag_get_info(sk, r, info);
166
167 if (sk->sk_state < TCP_TIME_WAIT &&
168 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
169 icsk->icsk_ca_ops->get_info(sk, ext, skb);
170
171 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
172 return skb->len;
173
174 rtattr_failure:
175 nlmsg_failure:
176 nlmsg_trim(skb, b);
177 return -EMSGSIZE;
178 }
179
180 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
181 struct sk_buff *skb, int ext, u32 pid,
182 u32 seq, u16 nlmsg_flags,
183 const struct nlmsghdr *unlh)
184 {
185 long tmo;
186 struct inet_diag_msg *r;
187 const unsigned char *previous_tail = skb_tail_pointer(skb);
188 struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
189 unlh->nlmsg_type, sizeof(*r));
190
191 r = NLMSG_DATA(nlh);
192 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
193
194 nlh->nlmsg_flags = nlmsg_flags;
195
196 tmo = tw->tw_ttd - jiffies;
197 if (tmo < 0)
198 tmo = 0;
199
200 r->idiag_family = tw->tw_family;
201 r->idiag_state = tw->tw_state;
202 r->idiag_timer = 0;
203 r->idiag_retrans = 0;
204 r->id.idiag_if = tw->tw_bound_dev_if;
205 r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
206 r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
207 r->id.idiag_sport = tw->tw_sport;
208 r->id.idiag_dport = tw->tw_dport;
209 r->id.idiag_src[0] = tw->tw_rcv_saddr;
210 r->id.idiag_dst[0] = tw->tw_daddr;
211 r->idiag_state = tw->tw_substate;
212 r->idiag_timer = 3;
213 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
214 r->idiag_rqueue = 0;
215 r->idiag_wqueue = 0;
216 r->idiag_uid = 0;
217 r->idiag_inode = 0;
218 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
219 if (tw->tw_family == AF_INET6) {
220 const struct inet6_timewait_sock *tw6 =
221 inet6_twsk((struct sock *)tw);
222
223 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
224 &tw6->tw_v6_rcv_saddr);
225 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
226 &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->dport <= 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)
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 unsigned char *bc = bytecode;
452 int len = bytecode_len;
453
454 while (len > 0) {
455 struct inet_diag_bc_op *op = (struct inet_diag_bc_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 if (op->yes < 4 || op->yes > len + 4)
467 return -EINVAL;
468 case INET_DIAG_BC_JMP:
469 if (op->no < 4 || op->no > len + 4)
470 return -EINVAL;
471 if (op->no < len &&
472 !valid_cc(bytecode, bytecode_len, len - op->no))
473 return -EINVAL;
474 break;
475 case INET_DIAG_BC_NOP:
476 if (op->yes < 4 || op->yes > len + 4)
477 return -EINVAL;
478 break;
479 default:
480 return -EINVAL;
481 }
482 bc += op->yes;
483 len -= op->yes;
484 }
485 return len == 0 ? 0 : -EINVAL;
486 }
487
488 static int inet_csk_diag_dump(struct sock *sk,
489 struct sk_buff *skb,
490 struct netlink_callback *cb)
491 {
492 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
493
494 if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
495 struct inet_diag_entry entry;
496 struct rtattr *bc = (struct rtattr *)(r + 1);
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->rcv_saddr;
510 entry.daddr = &inet->daddr;
511 }
512 entry.sport = inet->num;
513 entry.dport = ntohs(inet->dport);
514 entry.userlocks = sk->sk_userlocks;
515
516 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(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 (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
532 struct inet_diag_entry entry;
533 struct rtattr *bc = (struct rtattr *)(r + 1);
534
535 entry.family = tw->tw_family;
536 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
537 if (tw->tw_family == AF_INET6) {
538 struct inet6_timewait_sock *tw6 =
539 inet6_twsk((struct sock *)tw);
540 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
541 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
542 } else
543 #endif
544 {
545 entry.saddr = &tw->tw_rcv_saddr;
546 entry.daddr = &tw->tw_daddr;
547 }
548 entry.sport = tw->tw_num;
549 entry.dport = ntohs(tw->tw_dport);
550 entry.userlocks = 0;
551
552 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
553 return 0;
554 }
555
556 return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
557 NETLINK_CB(cb->skb).pid,
558 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
559 }
560
561 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
562 struct request_sock *req, u32 pid, u32 seq,
563 const struct nlmsghdr *unlh)
564 {
565 const struct inet_request_sock *ireq = inet_rsk(req);
566 struct inet_sock *inet = inet_sk(sk);
567 unsigned char *b = skb_tail_pointer(skb);
568 struct inet_diag_msg *r;
569 struct nlmsghdr *nlh;
570 long tmo;
571
572 nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
573 nlh->nlmsg_flags = NLM_F_MULTI;
574 r = NLMSG_DATA(nlh);
575
576 r->idiag_family = sk->sk_family;
577 r->idiag_state = TCP_SYN_RECV;
578 r->idiag_timer = 1;
579 r->idiag_retrans = req->retrans;
580
581 r->id.idiag_if = sk->sk_bound_dev_if;
582 r->id.idiag_cookie[0] = (u32)(unsigned long)req;
583 r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
584
585 tmo = req->expires - jiffies;
586 if (tmo < 0)
587 tmo = 0;
588
589 r->id.idiag_sport = inet->sport;
590 r->id.idiag_dport = ireq->rmt_port;
591 r->id.idiag_src[0] = ireq->loc_addr;
592 r->id.idiag_dst[0] = ireq->rmt_addr;
593 r->idiag_expires = jiffies_to_msecs(tmo);
594 r->idiag_rqueue = 0;
595 r->idiag_wqueue = 0;
596 r->idiag_uid = sock_i_uid(sk);
597 r->idiag_inode = 0;
598 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
599 if (r->idiag_family == AF_INET6) {
600 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
601 &inet6_rsk(req)->loc_addr);
602 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
603 &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 struct rtattr *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 (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
643 bc = (struct rtattr *)(r + 1);
644 entry.sport = inet->num;
645 entry.userlocks = sk->sk_userlocks;
646 }
647
648 for (j = s_j; j < lopt->nr_table_entries; j++) {
649 struct request_sock *req, *head = lopt->syn_table[j];
650
651 reqnum = 0;
652 for (req = head; req; reqnum++, req = req->dl_next) {
653 struct inet_request_sock *ireq = inet_rsk(req);
654
655 if (reqnum < s_reqnum)
656 continue;
657 if (r->id.idiag_dport != ireq->rmt_port &&
658 r->id.idiag_dport)
659 continue;
660
661 if (bc) {
662 entry.saddr =
663 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
664 (entry.family == AF_INET6) ?
665 inet6_rsk(req)->loc_addr.s6_addr32 :
666 #endif
667 &ireq->loc_addr;
668 entry.daddr =
669 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
670 (entry.family == AF_INET6) ?
671 inet6_rsk(req)->rmt_addr.s6_addr32 :
672 #endif
673 &ireq->rmt_addr;
674 entry.dport = ntohs(ireq->rmt_port);
675
676 if (!inet_diag_bc_run(RTA_DATA(bc),
677 RTA_PAYLOAD(bc), &entry))
678 continue;
679 }
680
681 err = inet_diag_fill_req(skb, sk, req,
682 NETLINK_CB(cb->skb).pid,
683 cb->nlh->nlmsg_seq, cb->nlh);
684 if (err < 0) {
685 cb->args[3] = j + 1;
686 cb->args[4] = reqnum;
687 goto out;
688 }
689 }
690
691 s_reqnum = 0;
692 }
693
694 out:
695 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
696
697 return err;
698 }
699
700 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
701 {
702 int i, num;
703 int s_i, s_num;
704 struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
705 const struct inet_diag_handler *handler;
706 struct inet_hashinfo *hashinfo;
707
708 handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
709 if (IS_ERR(handler))
710 goto unlock;
711
712 hashinfo = handler->idiag_hashinfo;
713
714 s_i = cb->args[1];
715 s_num = num = cb->args[2];
716
717 if (cb->args[0] == 0) {
718 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
719 goto skip_listen_ht;
720
721 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
722 struct sock *sk;
723 struct hlist_nulls_node *node;
724 struct inet_listen_hashbucket *ilb;
725
726 num = 0;
727 ilb = &hashinfo->listening_hash[i];
728 spin_lock_bh(&ilb->lock);
729 sk_nulls_for_each(sk, node, &ilb->head) {
730 struct inet_sock *inet = inet_sk(sk);
731
732 if (num < s_num) {
733 num++;
734 continue;
735 }
736
737 if (r->id.idiag_sport != inet->sport &&
738 r->id.idiag_sport)
739 goto next_listen;
740
741 if (!(r->idiag_states & TCPF_LISTEN) ||
742 r->id.idiag_dport ||
743 cb->args[3] > 0)
744 goto syn_recv;
745
746 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
747 spin_unlock_bh(&ilb->lock);
748 goto done;
749 }
750
751 syn_recv:
752 if (!(r->idiag_states & TCPF_SYN_RECV))
753 goto next_listen;
754
755 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
756 spin_unlock_bh(&ilb->lock);
757 goto done;
758 }
759
760 next_listen:
761 cb->args[3] = 0;
762 cb->args[4] = 0;
763 ++num;
764 }
765 spin_unlock_bh(&ilb->lock);
766
767 s_num = 0;
768 cb->args[3] = 0;
769 cb->args[4] = 0;
770 }
771 skip_listen_ht:
772 cb->args[0] = 1;
773 s_i = num = s_num = 0;
774 }
775
776 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
777 goto unlock;
778
779 for (i = s_i; i < hashinfo->ehash_size; i++) {
780 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
781 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
782 struct sock *sk;
783 struct hlist_nulls_node *node;
784
785 num = 0;
786
787 if (hlist_nulls_empty(&head->chain) &&
788 hlist_nulls_empty(&head->twchain))
789 continue;
790
791 if (i > s_i)
792 s_num = 0;
793
794 spin_lock_bh(lock);
795 sk_nulls_for_each(sk, node, &head->chain) {
796 struct inet_sock *inet = inet_sk(sk);
797
798 if (num < s_num)
799 goto next_normal;
800 if (!(r->idiag_states & (1 << sk->sk_state)))
801 goto next_normal;
802 if (r->id.idiag_sport != inet->sport &&
803 r->id.idiag_sport)
804 goto next_normal;
805 if (r->id.idiag_dport != inet->dport &&
806 r->id.idiag_dport)
807 goto next_normal;
808 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
809 spin_unlock_bh(lock);
810 goto done;
811 }
812 next_normal:
813 ++num;
814 }
815
816 if (r->idiag_states & TCPF_TIME_WAIT) {
817 struct inet_timewait_sock *tw;
818
819 inet_twsk_for_each(tw, node,
820 &head->twchain) {
821
822 if (num < s_num)
823 goto next_dying;
824 if (r->id.idiag_sport != tw->tw_sport &&
825 r->id.idiag_sport)
826 goto next_dying;
827 if (r->id.idiag_dport != tw->tw_dport &&
828 r->id.idiag_dport)
829 goto next_dying;
830 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
831 spin_unlock_bh(lock);
832 goto done;
833 }
834 next_dying:
835 ++num;
836 }
837 }
838 spin_unlock_bh(lock);
839 }
840
841 done:
842 cb->args[1] = i;
843 cb->args[2] = num;
844 unlock:
845 inet_diag_unlock_handler(handler);
846 return skb->len;
847 }
848
849 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
850 {
851 int hdrlen = sizeof(struct inet_diag_req);
852
853 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
854 nlmsg_len(nlh) < hdrlen)
855 return -EINVAL;
856
857 if (nlh->nlmsg_flags & NLM_F_DUMP) {
858 if (nlmsg_attrlen(nlh, hdrlen)) {
859 struct nlattr *attr;
860
861 attr = nlmsg_find_attr(nlh, hdrlen,
862 INET_DIAG_REQ_BYTECODE);
863 if (attr == NULL ||
864 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
865 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
866 return -EINVAL;
867 }
868
869 return netlink_dump_start(idiagnl, skb, nlh,
870 inet_diag_dump, NULL);
871 }
872
873 return inet_diag_get_exact(skb, nlh);
874 }
875
876 static DEFINE_MUTEX(inet_diag_mutex);
877
878 static void inet_diag_rcv(struct sk_buff *skb)
879 {
880 mutex_lock(&inet_diag_mutex);
881 netlink_rcv_skb(skb, &inet_diag_rcv_msg);
882 mutex_unlock(&inet_diag_mutex);
883 }
884
885 int inet_diag_register(const struct inet_diag_handler *h)
886 {
887 const __u16 type = h->idiag_type;
888 int err = -EINVAL;
889
890 if (type >= INET_DIAG_GETSOCK_MAX)
891 goto out;
892
893 mutex_lock(&inet_diag_table_mutex);
894 err = -EEXIST;
895 if (inet_diag_table[type] == NULL) {
896 inet_diag_table[type] = h;
897 err = 0;
898 }
899 mutex_unlock(&inet_diag_table_mutex);
900 out:
901 return err;
902 }
903 EXPORT_SYMBOL_GPL(inet_diag_register);
904
905 void inet_diag_unregister(const struct inet_diag_handler *h)
906 {
907 const __u16 type = h->idiag_type;
908
909 if (type >= INET_DIAG_GETSOCK_MAX)
910 return;
911
912 mutex_lock(&inet_diag_table_mutex);
913 inet_diag_table[type] = NULL;
914 mutex_unlock(&inet_diag_table_mutex);
915 }
916 EXPORT_SYMBOL_GPL(inet_diag_unregister);
917
918 static int __init inet_diag_init(void)
919 {
920 const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
921 sizeof(struct inet_diag_handler *));
922 int err = -ENOMEM;
923
924 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
925 if (!inet_diag_table)
926 goto out;
927
928 idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
929 inet_diag_rcv, NULL, THIS_MODULE);
930 if (idiagnl == NULL)
931 goto out_free_table;
932 err = 0;
933 out:
934 return err;
935 out_free_table:
936 kfree(inet_diag_table);
937 goto out;
938 }
939
940 static void __exit inet_diag_exit(void)
941 {
942 netlink_kernel_release(idiagnl);
943 kfree(inet_diag_table);
944 }
945
946 module_init(inet_diag_init);
947 module_exit(inet_diag_exit);
948 MODULE_LICENSE("GPL");
949 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);
(Inofficial) Linux kernel tree running on the Nao robot