686ddd62f71a3976d31ad28663dd0a8e4f8d132f
[linux-2.6.git] / net / ipv4 / inet_diag.c
1 /*
2  * inet_diag.c  Module for monitoring INET transport protocols sockets.
3  *
4  * Version:     $Id: inet_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $
5  *
6  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
7  *
8  *      This program is free software; you can redistribute it and/or
9  *      modify it under the terms of the GNU General Public License
10  *      as published by the Free Software Foundation; either version
11  *      2 of the License, or (at your option) any later version.
12  */
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <linux/fcntl.h>
18 #include <linux/random.h>
19 #include <linux/cache.h>
20 #include <linux/init.h>
21 #include <linux/time.h>
22
23 #include <net/icmp.h>
24 #include <net/tcp.h>
25 #include <net/ipv6.h>
26 #include <net/inet_common.h>
27 #include <net/inet_connection_sock.h>
28 #include <net/inet_hashtables.h>
29 #include <net/inet_timewait_sock.h>
30 #include <net/inet6_hashtables.h>
31 #include <net/netlink.h>
32
33 #include <linux/inet.h>
34 #include <linux/stddef.h>
35
36 #include <linux/inet_diag.h>
37
38 static const struct inet_diag_handler **inet_diag_table;
39
40 struct inet_diag_entry {
41         __be32 *saddr;
42         __be32 *daddr;
43         u16 sport;
44         u16 dport;
45         u16 family;
46         u16 userlocks;
47 };
48
49 static struct sock *idiagnl;
50
51 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
52         RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
53
54 static int inet_csk_diag_fill(struct sock *sk,
55                               struct sk_buff *skb,
56                               int ext, u32 pid, u32 seq, u16 nlmsg_flags,
57                               const struct nlmsghdr *unlh)
58 {
59         const struct inet_sock *inet = inet_sk(sk);
60         const struct inet_connection_sock *icsk = inet_csk(sk);
61         struct inet_diag_msg *r;
62         struct nlmsghdr  *nlh;
63         void *info = NULL;
64         struct inet_diag_meminfo  *minfo = NULL;
65         unsigned char    *b = skb_tail_pointer(skb);
66         const struct inet_diag_handler *handler;
67
68         handler = inet_diag_table[unlh->nlmsg_type];
69         BUG_ON(handler == NULL);
70
71         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
72         nlh->nlmsg_flags = nlmsg_flags;
73
74         r = NLMSG_DATA(nlh);
75         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
76
77         if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
78                 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
79
80         if (ext & (1 << (INET_DIAG_INFO - 1)))
81                 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
82                                      handler->idiag_info_size);
83
84         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
85                 const size_t len = strlen(icsk->icsk_ca_ops->name);
86
87                 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
88                        icsk->icsk_ca_ops->name);
89         }
90
91         r->idiag_family = sk->sk_family;
92         r->idiag_state = sk->sk_state;
93         r->idiag_timer = 0;
94         r->idiag_retrans = 0;
95
96         r->id.idiag_if = sk->sk_bound_dev_if;
97         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
98         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
99
100         r->id.idiag_sport = inet->sport;
101         r->id.idiag_dport = inet->dport;
102         r->id.idiag_src[0] = inet->rcv_saddr;
103         r->id.idiag_dst[0] = inet->daddr;
104
105 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
106         if (r->idiag_family == AF_INET6) {
107                 struct ipv6_pinfo *np = inet6_sk(sk);
108
109                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
110                                &np->rcv_saddr);
111                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
112                                &np->daddr);
113         }
114 #endif
115
116 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
117
118         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
119                 r->idiag_timer = 1;
120                 r->idiag_retrans = icsk->icsk_retransmits;
121                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
122         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
123                 r->idiag_timer = 4;
124                 r->idiag_retrans = icsk->icsk_probes_out;
125                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
126         } else if (timer_pending(&sk->sk_timer)) {
127                 r->idiag_timer = 2;
128                 r->idiag_retrans = icsk->icsk_probes_out;
129                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
130         } else {
131                 r->idiag_timer = 0;
132                 r->idiag_expires = 0;
133         }
134 #undef EXPIRES_IN_MS
135
136         r->idiag_uid = sock_i_uid(sk);
137         r->idiag_inode = sock_i_ino(sk);
138
139         if (minfo) {
140                 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
141                 minfo->idiag_wmem = sk->sk_wmem_queued;
142                 minfo->idiag_fmem = sk->sk_forward_alloc;
143                 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
144         }
145
146         handler->idiag_get_info(sk, r, info);
147
148         if (sk->sk_state < TCP_TIME_WAIT &&
149             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
150                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
151
152         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
153         return skb->len;
154
155 rtattr_failure:
156 nlmsg_failure:
157         nlmsg_trim(skb, b);
158         return -EMSGSIZE;
159 }
160
161 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
162                                struct sk_buff *skb, int ext, u32 pid,
163                                u32 seq, u16 nlmsg_flags,
164                                const struct nlmsghdr *unlh)
165 {
166         long tmo;
167         struct inet_diag_msg *r;
168         const unsigned char *previous_tail = skb_tail_pointer(skb);
169         struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
170                                          unlh->nlmsg_type, sizeof(*r));
171
172         r = NLMSG_DATA(nlh);
173         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
174
175         nlh->nlmsg_flags = nlmsg_flags;
176
177         tmo = tw->tw_ttd - jiffies;
178         if (tmo < 0)
179                 tmo = 0;
180
181         r->idiag_family       = tw->tw_family;
182         r->idiag_state        = tw->tw_state;
183         r->idiag_timer        = 0;
184         r->idiag_retrans      = 0;
185         r->id.idiag_if        = tw->tw_bound_dev_if;
186         r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
187         r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
188         r->id.idiag_sport     = tw->tw_sport;
189         r->id.idiag_dport     = tw->tw_dport;
190         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
191         r->id.idiag_dst[0]    = tw->tw_daddr;
192         r->idiag_state        = tw->tw_substate;
193         r->idiag_timer        = 3;
194         r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
195         r->idiag_rqueue       = 0;
196         r->idiag_wqueue       = 0;
197         r->idiag_uid          = 0;
198         r->idiag_inode        = 0;
199 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
200         if (tw->tw_family == AF_INET6) {
201                 const struct inet6_timewait_sock *tw6 =
202                                                 inet6_twsk((struct sock *)tw);
203
204                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
205                                &tw6->tw_v6_rcv_saddr);
206                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
207                                &tw6->tw_v6_daddr);
208         }
209 #endif
210         nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
211         return skb->len;
212 nlmsg_failure:
213         nlmsg_trim(skb, previous_tail);
214         return -EMSGSIZE;
215 }
216
217 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
218                         int ext, u32 pid, u32 seq, u16 nlmsg_flags,
219                         const struct nlmsghdr *unlh)
220 {
221         if (sk->sk_state == TCP_TIME_WAIT)
222                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
223                                            skb, ext, pid, seq, nlmsg_flags,
224                                            unlh);
225         return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
226 }
227
228 static int inet_diag_get_exact(struct sk_buff *in_skb,
229                                const struct nlmsghdr *nlh)
230 {
231         int err;
232         struct sock *sk;
233         struct inet_diag_req *req = NLMSG_DATA(nlh);
234         struct sk_buff *rep;
235         struct inet_hashinfo *hashinfo;
236         const struct inet_diag_handler *handler;
237
238         handler = inet_diag_table[nlh->nlmsg_type];
239         BUG_ON(handler == NULL);
240         hashinfo = handler->idiag_hashinfo;
241
242         if (req->idiag_family == AF_INET) {
243                 sk = inet_lookup(hashinfo, req->id.idiag_dst[0],
244                                  req->id.idiag_dport, req->id.idiag_src[0],
245                                  req->id.idiag_sport, req->id.idiag_if);
246         }
247 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
248         else if (req->idiag_family == AF_INET6) {
249                 sk = inet6_lookup(hashinfo,
250                                   (struct in6_addr *)req->id.idiag_dst,
251                                   req->id.idiag_dport,
252                                   (struct in6_addr *)req->id.idiag_src,
253                                   req->id.idiag_sport,
254                                   req->id.idiag_if);
255         }
256 #endif
257         else {
258                 return -EINVAL;
259         }
260
261         if (sk == NULL)
262                 return -ENOENT;
263
264         err = -ESTALE;
265         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
266              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
267             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
268              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
269                 goto out;
270
271         err = -ENOMEM;
272         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
273                                      sizeof(struct inet_diag_meminfo) +
274                                      handler->idiag_info_size + 64)),
275                         GFP_KERNEL);
276         if (!rep)
277                 goto out;
278
279         err = sk_diag_fill(sk, rep, req->idiag_ext,
280                            NETLINK_CB(in_skb).pid,
281                            nlh->nlmsg_seq, 0, nlh);
282         if (err < 0) {
283                 WARN_ON(err == -EMSGSIZE);
284                 kfree_skb(rep);
285                 goto out;
286         }
287         err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
288                               MSG_DONTWAIT);
289         if (err > 0)
290                 err = 0;
291
292 out:
293         if (sk) {
294                 if (sk->sk_state == TCP_TIME_WAIT)
295                         inet_twsk_put((struct inet_timewait_sock *)sk);
296                 else
297                         sock_put(sk);
298         }
299         return err;
300 }
301
302 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
303 {
304         int words = bits >> 5;
305
306         bits &= 0x1f;
307
308         if (words) {
309                 if (memcmp(a1, a2, words << 2))
310                         return 0;
311         }
312         if (bits) {
313                 __be32 w1, w2;
314                 __be32 mask;
315
316                 w1 = a1[words];
317                 w2 = a2[words];
318
319                 mask = htonl((0xffffffff) << (32 - bits));
320
321                 if ((w1 ^ w2) & mask)
322                         return 0;
323         }
324
325         return 1;
326 }
327
328
329 static int inet_diag_bc_run(const void *bc, int len,
330                             const struct inet_diag_entry *entry)
331 {
332         while (len > 0) {
333                 int yes = 1;
334                 const struct inet_diag_bc_op *op = bc;
335
336                 switch (op->code) {
337                 case INET_DIAG_BC_NOP:
338                         break;
339                 case INET_DIAG_BC_JMP:
340                         yes = 0;
341                         break;
342                 case INET_DIAG_BC_S_GE:
343                         yes = entry->sport >= op[1].no;
344                         break;
345                 case INET_DIAG_BC_S_LE:
346                         yes = entry->dport <= op[1].no;
347                         break;
348                 case INET_DIAG_BC_D_GE:
349                         yes = entry->dport >= op[1].no;
350                         break;
351                 case INET_DIAG_BC_D_LE:
352                         yes = entry->dport <= op[1].no;
353                         break;
354                 case INET_DIAG_BC_AUTO:
355                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
356                         break;
357                 case INET_DIAG_BC_S_COND:
358                 case INET_DIAG_BC_D_COND: {
359                         struct inet_diag_hostcond *cond;
360                         __be32 *addr;
361
362                         cond = (struct inet_diag_hostcond *)(op + 1);
363                         if (cond->port != -1 &&
364                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
365                                              entry->sport : entry->dport)) {
366                                 yes = 0;
367                                 break;
368                         }
369
370                         if (cond->prefix_len == 0)
371                                 break;
372
373                         if (op->code == INET_DIAG_BC_S_COND)
374                                 addr = entry->saddr;
375                         else
376                                 addr = entry->daddr;
377
378                         if (bitstring_match(addr, cond->addr,
379                                             cond->prefix_len))
380                                 break;
381                         if (entry->family == AF_INET6 &&
382                             cond->family == AF_INET) {
383                                 if (addr[0] == 0 && addr[1] == 0 &&
384                                     addr[2] == htonl(0xffff) &&
385                                     bitstring_match(addr + 3, cond->addr,
386                                                     cond->prefix_len))
387                                         break;
388                         }
389                         yes = 0;
390                         break;
391                 }
392                 }
393
394                 if (yes) {
395                         len -= op->yes;
396                         bc += op->yes;
397                 } else {
398                         len -= op->no;
399                         bc += op->no;
400                 }
401         }
402         return (len == 0);
403 }
404
405 static int valid_cc(const void *bc, int len, int cc)
406 {
407         while (len >= 0) {
408                 const struct inet_diag_bc_op *op = bc;
409
410                 if (cc > len)
411                         return 0;
412                 if (cc == len)
413                         return 1;
414                 if (op->yes < 4)
415                         return 0;
416                 len -= op->yes;
417                 bc  += op->yes;
418         }
419         return 0;
420 }
421
422 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
423 {
424         const unsigned char *bc = bytecode;
425         int  len = bytecode_len;
426
427         while (len > 0) {
428                 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
429
430 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
431                 switch (op->code) {
432                 case INET_DIAG_BC_AUTO:
433                 case INET_DIAG_BC_S_COND:
434                 case INET_DIAG_BC_D_COND:
435                 case INET_DIAG_BC_S_GE:
436                 case INET_DIAG_BC_S_LE:
437                 case INET_DIAG_BC_D_GE:
438                 case INET_DIAG_BC_D_LE:
439                         if (op->yes < 4 || op->yes > len + 4)
440                                 return -EINVAL;
441                 case INET_DIAG_BC_JMP:
442                         if (op->no < 4 || op->no > len + 4)
443                                 return -EINVAL;
444                         if (op->no < len &&
445                             !valid_cc(bytecode, bytecode_len, len - op->no))
446                                 return -EINVAL;
447                         break;
448                 case INET_DIAG_BC_NOP:
449                         if (op->yes < 4 || op->yes > len + 4)
450                                 return -EINVAL;
451                         break;
452                 default:
453                         return -EINVAL;
454                 }
455                 bc  += op->yes;
456                 len -= op->yes;
457         }
458         return len == 0 ? 0 : -EINVAL;
459 }
460
461 static int inet_csk_diag_dump(struct sock *sk,
462                               struct sk_buff *skb,
463                               struct netlink_callback *cb)
464 {
465         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
466
467         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
468                 struct inet_diag_entry entry;
469                 struct rtattr *bc = (struct rtattr *)(r + 1);
470                 struct inet_sock *inet = inet_sk(sk);
471
472                 entry.family = sk->sk_family;
473 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
474                 if (entry.family == AF_INET6) {
475                         struct ipv6_pinfo *np = inet6_sk(sk);
476
477                         entry.saddr = np->rcv_saddr.s6_addr32;
478                         entry.daddr = np->daddr.s6_addr32;
479                 } else
480 #endif
481                 {
482                         entry.saddr = &inet->rcv_saddr;
483                         entry.daddr = &inet->daddr;
484                 }
485                 entry.sport = inet->num;
486                 entry.dport = ntohs(inet->dport);
487                 entry.userlocks = sk->sk_userlocks;
488
489                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
490                         return 0;
491         }
492
493         return inet_csk_diag_fill(sk, skb, r->idiag_ext,
494                                   NETLINK_CB(cb->skb).pid,
495                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
496 }
497
498 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
499                                struct sk_buff *skb,
500                                struct netlink_callback *cb)
501 {
502         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
503
504         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
505                 struct inet_diag_entry entry;
506                 struct rtattr *bc = (struct rtattr *)(r + 1);
507
508                 entry.family = tw->tw_family;
509 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
510                 if (tw->tw_family == AF_INET6) {
511                         struct inet6_timewait_sock *tw6 =
512                                                 inet6_twsk((struct sock *)tw);
513                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
514                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
515                 } else
516 #endif
517                 {
518                         entry.saddr = &tw->tw_rcv_saddr;
519                         entry.daddr = &tw->tw_daddr;
520                 }
521                 entry.sport = tw->tw_num;
522                 entry.dport = ntohs(tw->tw_dport);
523                 entry.userlocks = 0;
524
525                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
526                         return 0;
527         }
528
529         return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
530                                    NETLINK_CB(cb->skb).pid,
531                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
532 }
533
534 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
535                               struct request_sock *req, u32 pid, u32 seq,
536                               const struct nlmsghdr *unlh)
537 {
538         const struct inet_request_sock *ireq = inet_rsk(req);
539         struct inet_sock *inet = inet_sk(sk);
540         unsigned char *b = skb_tail_pointer(skb);
541         struct inet_diag_msg *r;
542         struct nlmsghdr *nlh;
543         long tmo;
544
545         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
546         nlh->nlmsg_flags = NLM_F_MULTI;
547         r = NLMSG_DATA(nlh);
548
549         r->idiag_family = sk->sk_family;
550         r->idiag_state = TCP_SYN_RECV;
551         r->idiag_timer = 1;
552         r->idiag_retrans = req->retrans;
553
554         r->id.idiag_if = sk->sk_bound_dev_if;
555         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
556         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
557
558         tmo = req->expires - jiffies;
559         if (tmo < 0)
560                 tmo = 0;
561
562         r->id.idiag_sport = inet->sport;
563         r->id.idiag_dport = ireq->rmt_port;
564         r->id.idiag_src[0] = ireq->loc_addr;
565         r->id.idiag_dst[0] = ireq->rmt_addr;
566         r->idiag_expires = jiffies_to_msecs(tmo);
567         r->idiag_rqueue = 0;
568         r->idiag_wqueue = 0;
569         r->idiag_uid = sock_i_uid(sk);
570         r->idiag_inode = 0;
571 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
572         if (r->idiag_family == AF_INET6) {
573                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
574                                &inet6_rsk(req)->loc_addr);
575                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
576                                &inet6_rsk(req)->rmt_addr);
577         }
578 #endif
579         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
580
581         return skb->len;
582
583 nlmsg_failure:
584         nlmsg_trim(skb, b);
585         return -1;
586 }
587
588 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
589                                struct netlink_callback *cb)
590 {
591         struct inet_diag_entry entry;
592         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
593         struct inet_connection_sock *icsk = inet_csk(sk);
594         struct listen_sock *lopt;
595         struct rtattr *bc = NULL;
596         struct inet_sock *inet = inet_sk(sk);
597         int j, s_j;
598         int reqnum, s_reqnum;
599         int err = 0;
600
601         s_j = cb->args[3];
602         s_reqnum = cb->args[4];
603
604         if (s_j > 0)
605                 s_j--;
606
607         entry.family = sk->sk_family;
608
609         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
610
611         lopt = icsk->icsk_accept_queue.listen_opt;
612         if (!lopt || !lopt->qlen)
613                 goto out;
614
615         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
616                 bc = (struct rtattr *)(r + 1);
617                 entry.sport = inet->num;
618                 entry.userlocks = sk->sk_userlocks;
619         }
620
621         for (j = s_j; j < lopt->nr_table_entries; j++) {
622                 struct request_sock *req, *head = lopt->syn_table[j];
623
624                 reqnum = 0;
625                 for (req = head; req; reqnum++, req = req->dl_next) {
626                         struct inet_request_sock *ireq = inet_rsk(req);
627
628                         if (reqnum < s_reqnum)
629                                 continue;
630                         if (r->id.idiag_dport != ireq->rmt_port &&
631                             r->id.idiag_dport)
632                                 continue;
633
634                         if (bc) {
635                                 entry.saddr =
636 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
637                                         (entry.family == AF_INET6) ?
638                                         inet6_rsk(req)->loc_addr.s6_addr32 :
639 #endif
640                                         &ireq->loc_addr;
641                                 entry.daddr =
642 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
643                                         (entry.family == AF_INET6) ?
644                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
645 #endif
646                                         &ireq->rmt_addr;
647                                 entry.dport = ntohs(ireq->rmt_port);
648
649                                 if (!inet_diag_bc_run(RTA_DATA(bc),
650                                                     RTA_PAYLOAD(bc), &entry))
651                                         continue;
652                         }
653
654                         err = inet_diag_fill_req(skb, sk, req,
655                                                NETLINK_CB(cb->skb).pid,
656                                                cb->nlh->nlmsg_seq, cb->nlh);
657                         if (err < 0) {
658                                 cb->args[3] = j + 1;
659                                 cb->args[4] = reqnum;
660                                 goto out;
661                         }
662                 }
663
664                 s_reqnum = 0;
665         }
666
667 out:
668         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
669
670         return err;
671 }
672
673 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
674 {
675         int i, num;
676         int s_i, s_num;
677         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
678         const struct inet_diag_handler *handler;
679         struct inet_hashinfo *hashinfo;
680
681         handler = inet_diag_table[cb->nlh->nlmsg_type];
682         BUG_ON(handler == NULL);
683         hashinfo = handler->idiag_hashinfo;
684
685         s_i = cb->args[1];
686         s_num = num = cb->args[2];
687
688         if (cb->args[0] == 0) {
689                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
690                         goto skip_listen_ht;
691
692                 inet_listen_lock(hashinfo);
693                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
694                         struct sock *sk;
695                         struct hlist_node *node;
696
697                         num = 0;
698                         sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
699                                 struct inet_sock *inet = inet_sk(sk);
700
701                                 if (num < s_num) {
702                                         num++;
703                                         continue;
704                                 }
705
706                                 if (r->id.idiag_sport != inet->sport &&
707                                     r->id.idiag_sport)
708                                         goto next_listen;
709
710                                 if (!(r->idiag_states & TCPF_LISTEN) ||
711                                     r->id.idiag_dport ||
712                                     cb->args[3] > 0)
713                                         goto syn_recv;
714
715                                 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
716                                         inet_listen_unlock(hashinfo);
717                                         goto done;
718                                 }
719
720 syn_recv:
721                                 if (!(r->idiag_states & TCPF_SYN_RECV))
722                                         goto next_listen;
723
724                                 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
725                                         inet_listen_unlock(hashinfo);
726                                         goto done;
727                                 }
728
729 next_listen:
730                                 cb->args[3] = 0;
731                                 cb->args[4] = 0;
732                                 ++num;
733                         }
734
735                         s_num = 0;
736                         cb->args[3] = 0;
737                         cb->args[4] = 0;
738                 }
739                 inet_listen_unlock(hashinfo);
740 skip_listen_ht:
741                 cb->args[0] = 1;
742                 s_i = num = s_num = 0;
743         }
744
745         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
746                 return skb->len;
747
748         for (i = s_i; i < hashinfo->ehash_size; i++) {
749                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
750                 struct sock *sk;
751                 struct hlist_node *node;
752
753                 if (i > s_i)
754                         s_num = 0;
755
756                 read_lock_bh(&head->lock);
757                 num = 0;
758                 sk_for_each(sk, node, &head->chain) {
759                         struct inet_sock *inet = inet_sk(sk);
760
761                         if (num < s_num)
762                                 goto next_normal;
763                         if (!(r->idiag_states & (1 << sk->sk_state)))
764                                 goto next_normal;
765                         if (r->id.idiag_sport != inet->sport &&
766                             r->id.idiag_sport)
767                                 goto next_normal;
768                         if (r->id.idiag_dport != inet->dport &&
769                             r->id.idiag_dport)
770                                 goto next_normal;
771                         if (inet_csk_diag_dump(sk, skb, cb) < 0) {
772                                 read_unlock_bh(&head->lock);
773                                 goto done;
774                         }
775 next_normal:
776                         ++num;
777                 }
778
779                 if (r->idiag_states & TCPF_TIME_WAIT) {
780                         struct inet_timewait_sock *tw;
781
782                         inet_twsk_for_each(tw, node,
783                                     &head->twchain) {
784
785                                 if (num < s_num)
786                                         goto next_dying;
787                                 if (r->id.idiag_sport != tw->tw_sport &&
788                                     r->id.idiag_sport)
789                                         goto next_dying;
790                                 if (r->id.idiag_dport != tw->tw_dport &&
791                                     r->id.idiag_dport)
792                                         goto next_dying;
793                                 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
794                                         read_unlock_bh(&head->lock);
795                                         goto done;
796                                 }
797 next_dying:
798                                 ++num;
799                         }
800                 }
801                 read_unlock_bh(&head->lock);
802         }
803
804 done:
805         cb->args[1] = i;
806         cb->args[2] = num;
807         return skb->len;
808 }
809
810 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
811 {
812         int hdrlen = sizeof(struct inet_diag_req);
813
814         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
815             nlmsg_len(nlh) < hdrlen)
816                 return -EINVAL;
817
818         if (inet_diag_table[nlh->nlmsg_type] == NULL)
819                 return -ENOENT;
820
821         if (nlh->nlmsg_flags & NLM_F_DUMP) {
822                 if (nlmsg_attrlen(nlh, hdrlen)) {
823                         struct nlattr *attr;
824
825                         attr = nlmsg_find_attr(nlh, hdrlen,
826                                                INET_DIAG_REQ_BYTECODE);
827                         if (attr == NULL ||
828                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
829                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
830                                 return -EINVAL;
831                 }
832
833                 return netlink_dump_start(idiagnl, skb, nlh,
834                                           inet_diag_dump, NULL);
835         }
836
837         return inet_diag_get_exact(skb, nlh);
838 }
839
840 static DEFINE_MUTEX(inet_diag_mutex);
841
842 static void inet_diag_rcv(struct sock *sk, int len)
843 {
844         unsigned int qlen = 0;
845
846         do {
847                 mutex_lock(&inet_diag_mutex);
848                 netlink_run_queue(sk, &qlen, &inet_diag_rcv_msg);
849                 mutex_unlock(&inet_diag_mutex);
850         } while (qlen);
851 }
852
853 static DEFINE_SPINLOCK(inet_diag_register_lock);
854
855 int inet_diag_register(const struct inet_diag_handler *h)
856 {
857         const __u16 type = h->idiag_type;
858         int err = -EINVAL;
859
860         if (type >= INET_DIAG_GETSOCK_MAX)
861                 goto out;
862
863         spin_lock(&inet_diag_register_lock);
864         err = -EEXIST;
865         if (inet_diag_table[type] == NULL) {
866                 inet_diag_table[type] = h;
867                 err = 0;
868         }
869         spin_unlock(&inet_diag_register_lock);
870 out:
871         return err;
872 }
873 EXPORT_SYMBOL_GPL(inet_diag_register);
874
875 void inet_diag_unregister(const struct inet_diag_handler *h)
876 {
877         const __u16 type = h->idiag_type;
878
879         if (type >= INET_DIAG_GETSOCK_MAX)
880                 return;
881
882         spin_lock(&inet_diag_register_lock);
883         inet_diag_table[type] = NULL;
884         spin_unlock(&inet_diag_register_lock);
885
886         synchronize_rcu();
887 }
888 EXPORT_SYMBOL_GPL(inet_diag_unregister);
889
890 static int __init inet_diag_init(void)
891 {
892         const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
893                                           sizeof(struct inet_diag_handler *));
894         int err = -ENOMEM;
895
896         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
897         if (!inet_diag_table)
898                 goto out;
899
900         idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, 0, inet_diag_rcv,
901                                         NULL, THIS_MODULE);
902         if (idiagnl == NULL)
903                 goto out_free_table;
904         err = 0;
905 out:
906         return err;
907 out_free_table:
908         kfree(inet_diag_table);
909         goto out;
910 }
911
912 static void __exit inet_diag_exit(void)
913 {
914         sock_release(idiagnl->sk_socket);
915         kfree(inet_diag_table);
916 }
917
918 module_init(inet_diag_init);
919 module_exit(inet_diag_exit);
920 MODULE_LICENSE("GPL");