Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus
[linux-2.6] / 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/module.h>
15 #include <linux/types.h>
16 #include <linux/fcntl.h>
17 #include <linux/random.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
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 int inet_csk_diag_fill(struct sock *sk,
53                               struct sk_buff *skb,
54                               int ext, u32 pid, u32 seq, u16 nlmsg_flags,
55                               const struct nlmsghdr *unlh)
56 {
57         const struct inet_sock *inet = inet_sk(sk);
58         const struct inet_connection_sock *icsk = inet_csk(sk);
59         struct inet_diag_msg *r;
60         struct nlmsghdr  *nlh;
61         void *info = NULL;
62         struct inet_diag_meminfo  *minfo = NULL;
63         unsigned char    *b = skb->tail;
64         const struct inet_diag_handler *handler;
65
66         handler = inet_diag_table[unlh->nlmsg_type];
67         BUG_ON(handler == NULL);
68
69         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
70         nlh->nlmsg_flags = nlmsg_flags;
71
72         r = NLMSG_DATA(nlh);
73         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
74
75         if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
76                 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
77
78         if (ext & (1 << (INET_DIAG_INFO - 1)))
79                 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
80                                      handler->idiag_info_size);
81
82         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
83                 const size_t len = strlen(icsk->icsk_ca_ops->name);
84
85                 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
86                        icsk->icsk_ca_ops->name);
87         }
88
89         r->idiag_family = sk->sk_family;
90         r->idiag_state = sk->sk_state;
91         r->idiag_timer = 0;
92         r->idiag_retrans = 0;
93
94         r->id.idiag_if = sk->sk_bound_dev_if;
95         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
96         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
97
98         r->id.idiag_sport = inet->sport;
99         r->id.idiag_dport = inet->dport;
100         r->id.idiag_src[0] = inet->rcv_saddr;
101         r->id.idiag_dst[0] = inet->daddr;
102
103 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
104         if (r->idiag_family == AF_INET6) {
105                 struct ipv6_pinfo *np = inet6_sk(sk);
106
107                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
108                                &np->rcv_saddr);
109                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
110                                &np->daddr);
111         }
112 #endif
113
114 #define EXPIRES_IN_MS(tmo)  ((tmo - jiffies) * 1000 + HZ - 1) / HZ
115
116         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
117                 r->idiag_timer = 1;
118                 r->idiag_retrans = icsk->icsk_retransmits;
119                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
120         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
121                 r->idiag_timer = 4;
122                 r->idiag_retrans = icsk->icsk_probes_out;
123                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
124         } else if (timer_pending(&sk->sk_timer)) {
125                 r->idiag_timer = 2;
126                 r->idiag_retrans = icsk->icsk_probes_out;
127                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
128         } else {
129                 r->idiag_timer = 0;
130                 r->idiag_expires = 0;
131         }
132 #undef EXPIRES_IN_MS
133
134         r->idiag_uid = sock_i_uid(sk);
135         r->idiag_inode = sock_i_ino(sk);
136
137         if (minfo) {
138                 minfo->idiag_rmem = atomic_read(&sk->sk_rmem_alloc);
139                 minfo->idiag_wmem = sk->sk_wmem_queued;
140                 minfo->idiag_fmem = sk->sk_forward_alloc;
141                 minfo->idiag_tmem = atomic_read(&sk->sk_wmem_alloc);
142         }
143
144         handler->idiag_get_info(sk, r, info);
145
146         if (sk->sk_state < TCP_TIME_WAIT &&
147             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
148                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
149
150         nlh->nlmsg_len = skb->tail - b;
151         return skb->len;
152
153 rtattr_failure:
154 nlmsg_failure:
155         skb_trim(skb, b - skb->data);
156         return -EMSGSIZE;
157 }
158
159 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
160                                struct sk_buff *skb, int ext, u32 pid,
161                                u32 seq, u16 nlmsg_flags,
162                                const struct nlmsghdr *unlh)
163 {
164         long tmo;
165         struct inet_diag_msg *r;
166         const unsigned char *previous_tail = skb->tail;
167         struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
168                                          unlh->nlmsg_type, sizeof(*r));
169
170         r = NLMSG_DATA(nlh);
171         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
172
173         nlh->nlmsg_flags = nlmsg_flags;
174
175         tmo = tw->tw_ttd - jiffies;
176         if (tmo < 0)
177                 tmo = 0;
178
179         r->idiag_family       = tw->tw_family;
180         r->idiag_state        = tw->tw_state;
181         r->idiag_timer        = 0;
182         r->idiag_retrans      = 0;
183         r->id.idiag_if        = tw->tw_bound_dev_if;
184         r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
185         r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
186         r->id.idiag_sport     = tw->tw_sport;
187         r->id.idiag_dport     = tw->tw_dport;
188         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
189         r->id.idiag_dst[0]    = tw->tw_daddr;
190         r->idiag_state        = tw->tw_substate;
191         r->idiag_timer        = 3;
192         r->idiag_expires      = (tmo * 1000 + HZ - 1) / HZ;
193         r->idiag_rqueue       = 0;
194         r->idiag_wqueue       = 0;
195         r->idiag_uid          = 0;
196         r->idiag_inode        = 0;
197 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
198         if (tw->tw_family == AF_INET6) {
199                 const struct inet6_timewait_sock *tw6 =
200                                                 inet6_twsk((struct sock *)tw);
201
202                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
203                                &tw6->tw_v6_rcv_saddr);
204                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
205                                &tw6->tw_v6_daddr);
206         }
207 #endif
208         nlh->nlmsg_len = skb->tail - previous_tail;
209         return skb->len;
210 nlmsg_failure:
211         skb_trim(skb, previous_tail - skb->data);
212         return -EMSGSIZE;
213 }
214
215 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
216                         int ext, u32 pid, u32 seq, u16 nlmsg_flags,
217                         const struct nlmsghdr *unlh)
218 {
219         if (sk->sk_state == TCP_TIME_WAIT)
220                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
221                                            skb, ext, pid, seq, nlmsg_flags,
222                                            unlh);
223         return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
224 }
225
226 static int inet_diag_get_exact(struct sk_buff *in_skb,
227                                const struct nlmsghdr *nlh)
228 {
229         int err;
230         struct sock *sk;
231         struct inet_diag_req *req = NLMSG_DATA(nlh);
232         struct sk_buff *rep;
233         struct inet_hashinfo *hashinfo;
234         const struct inet_diag_handler *handler;
235
236         handler = inet_diag_table[nlh->nlmsg_type];
237         BUG_ON(handler == NULL);
238         hashinfo = handler->idiag_hashinfo;
239
240         if (req->idiag_family == AF_INET) {
241                 sk = inet_lookup(hashinfo, req->id.idiag_dst[0],
242                                  req->id.idiag_dport, req->id.idiag_src[0],
243                                  req->id.idiag_sport, req->id.idiag_if);
244         }
245 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
246         else if (req->idiag_family == AF_INET6) {
247                 sk = inet6_lookup(hashinfo,
248                                   (struct in6_addr *)req->id.idiag_dst,
249                                   req->id.idiag_dport,
250                                   (struct in6_addr *)req->id.idiag_src,
251                                   req->id.idiag_sport,
252                                   req->id.idiag_if);
253         }
254 #endif
255         else {
256                 return -EINVAL;
257         }
258
259         if (sk == NULL)
260                 return -ENOENT;
261
262         err = -ESTALE;
263         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
264              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
265             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
266              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
267                 goto out;
268
269         err = -ENOMEM;
270         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
271                                      sizeof(struct inet_diag_meminfo) +
272                                      handler->idiag_info_size + 64)),
273                         GFP_KERNEL);
274         if (!rep)
275                 goto out;
276
277         err = sk_diag_fill(sk, rep, req->idiag_ext,
278                            NETLINK_CB(in_skb).pid,
279                            nlh->nlmsg_seq, 0, nlh);
280         if (err < 0) {
281                 WARN_ON(err == -EMSGSIZE);
282                 kfree_skb(rep);
283                 goto out;
284         }
285         err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
286                               MSG_DONTWAIT);
287         if (err > 0)
288                 err = 0;
289
290 out:
291         if (sk) {
292                 if (sk->sk_state == TCP_TIME_WAIT)
293                         inet_twsk_put((struct inet_timewait_sock *)sk);
294                 else
295                         sock_put(sk);
296         }
297         return err;
298 }
299
300 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
301 {
302         int words = bits >> 5;
303
304         bits &= 0x1f;
305
306         if (words) {
307                 if (memcmp(a1, a2, words << 2))
308                         return 0;
309         }
310         if (bits) {
311                 __be32 w1, w2;
312                 __be32 mask;
313
314                 w1 = a1[words];
315                 w2 = a2[words];
316
317                 mask = htonl((0xffffffff) << (32 - bits));
318
319                 if ((w1 ^ w2) & mask)
320                         return 0;
321         }
322
323         return 1;
324 }
325
326
327 static int inet_diag_bc_run(const void *bc, int len,
328                             const struct inet_diag_entry *entry)
329 {
330         while (len > 0) {
331                 int yes = 1;
332                 const struct inet_diag_bc_op *op = bc;
333
334                 switch (op->code) {
335                 case INET_DIAG_BC_NOP:
336                         break;
337                 case INET_DIAG_BC_JMP:
338                         yes = 0;
339                         break;
340                 case INET_DIAG_BC_S_GE:
341                         yes = entry->sport >= op[1].no;
342                         break;
343                 case INET_DIAG_BC_S_LE:
344                         yes = entry->dport <= op[1].no;
345                         break;
346                 case INET_DIAG_BC_D_GE:
347                         yes = entry->dport >= op[1].no;
348                         break;
349                 case INET_DIAG_BC_D_LE:
350                         yes = entry->dport <= op[1].no;
351                         break;
352                 case INET_DIAG_BC_AUTO:
353                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
354                         break;
355                 case INET_DIAG_BC_S_COND:
356                 case INET_DIAG_BC_D_COND: {
357                         struct inet_diag_hostcond *cond;
358                         __be32 *addr;
359
360                         cond = (struct inet_diag_hostcond *)(op + 1);
361                         if (cond->port != -1 &&
362                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
363                                              entry->sport : entry->dport)) {
364                                 yes = 0;
365                                 break;
366                         }
367
368                         if (cond->prefix_len == 0)
369                                 break;
370
371                         if (op->code == INET_DIAG_BC_S_COND)
372                                 addr = entry->saddr;
373                         else
374                                 addr = entry->daddr;
375
376                         if (bitstring_match(addr, cond->addr,
377                                             cond->prefix_len))
378                                 break;
379                         if (entry->family == AF_INET6 &&
380                             cond->family == AF_INET) {
381                                 if (addr[0] == 0 && addr[1] == 0 &&
382                                     addr[2] == htonl(0xffff) &&
383                                     bitstring_match(addr + 3, cond->addr,
384                                                     cond->prefix_len))
385                                         break;
386                         }
387                         yes = 0;
388                         break;
389                 }
390                 }
391
392                 if (yes) {
393                         len -= op->yes;
394                         bc += op->yes;
395                 } else {
396                         len -= op->no;
397                         bc += op->no;
398                 }
399         }
400         return (len == 0);
401 }
402
403 static int valid_cc(const void *bc, int len, int cc)
404 {
405         while (len >= 0) {
406                 const struct inet_diag_bc_op *op = bc;
407
408                 if (cc > len)
409                         return 0;
410                 if (cc == len)
411                         return 1;
412                 if (op->yes < 4)
413                         return 0;
414                 len -= op->yes;
415                 bc  += op->yes;
416         }
417         return 0;
418 }
419
420 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
421 {
422         const unsigned char *bc = bytecode;
423         int  len = bytecode_len;
424
425         while (len > 0) {
426                 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
427
428 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
429                 switch (op->code) {
430                 case INET_DIAG_BC_AUTO:
431                 case INET_DIAG_BC_S_COND:
432                 case INET_DIAG_BC_D_COND:
433                 case INET_DIAG_BC_S_GE:
434                 case INET_DIAG_BC_S_LE:
435                 case INET_DIAG_BC_D_GE:
436                 case INET_DIAG_BC_D_LE:
437                         if (op->yes < 4 || op->yes > len + 4)
438                                 return -EINVAL;
439                 case INET_DIAG_BC_JMP:
440                         if (op->no < 4 || op->no > len + 4)
441                                 return -EINVAL;
442                         if (op->no < len &&
443                             !valid_cc(bytecode, bytecode_len, len - op->no))
444                                 return -EINVAL;
445                         break;
446                 case INET_DIAG_BC_NOP:
447                         if (op->yes < 4 || op->yes > len + 4)
448                                 return -EINVAL;
449                         break;
450                 default:
451                         return -EINVAL;
452                 }
453                 bc  += op->yes;
454                 len -= op->yes;
455         }
456         return len == 0 ? 0 : -EINVAL;
457 }
458
459 static int inet_csk_diag_dump(struct sock *sk,
460                               struct sk_buff *skb,
461                               struct netlink_callback *cb)
462 {
463         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
464
465         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
466                 struct inet_diag_entry entry;
467                 struct rtattr *bc = (struct rtattr *)(r + 1);
468                 struct inet_sock *inet = inet_sk(sk);
469
470                 entry.family = sk->sk_family;
471 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
472                 if (entry.family == AF_INET6) {
473                         struct ipv6_pinfo *np = inet6_sk(sk);
474
475                         entry.saddr = np->rcv_saddr.s6_addr32;
476                         entry.daddr = np->daddr.s6_addr32;
477                 } else
478 #endif
479                 {
480                         entry.saddr = &inet->rcv_saddr;
481                         entry.daddr = &inet->daddr;
482                 }
483                 entry.sport = inet->num;
484                 entry.dport = ntohs(inet->dport);
485                 entry.userlocks = sk->sk_userlocks;
486
487                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
488                         return 0;
489         }
490
491         return inet_csk_diag_fill(sk, skb, r->idiag_ext,
492                                   NETLINK_CB(cb->skb).pid,
493                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
494 }
495
496 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
497                                struct sk_buff *skb,
498                                struct netlink_callback *cb)
499 {
500         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
501
502         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
503                 struct inet_diag_entry entry;
504                 struct rtattr *bc = (struct rtattr *)(r + 1);
505
506                 entry.family = tw->tw_family;
507 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
508                 if (tw->tw_family == AF_INET6) {
509                         struct inet6_timewait_sock *tw6 =
510                                                 inet6_twsk((struct sock *)tw);
511                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
512                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
513                 } else
514 #endif
515                 {
516                         entry.saddr = &tw->tw_rcv_saddr;
517                         entry.daddr = &tw->tw_daddr;
518                 }
519                 entry.sport = tw->tw_num;
520                 entry.dport = ntohs(tw->tw_dport);
521                 entry.userlocks = 0;
522
523                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
524                         return 0;
525         }
526
527         return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
528                                    NETLINK_CB(cb->skb).pid,
529                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
530 }
531
532 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
533                               struct request_sock *req, u32 pid, u32 seq,
534                               const struct nlmsghdr *unlh)
535 {
536         const struct inet_request_sock *ireq = inet_rsk(req);
537         struct inet_sock *inet = inet_sk(sk);
538         unsigned char *b = skb->tail;
539         struct inet_diag_msg *r;
540         struct nlmsghdr *nlh;
541         long tmo;
542
543         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
544         nlh->nlmsg_flags = NLM_F_MULTI;
545         r = NLMSG_DATA(nlh);
546
547         r->idiag_family = sk->sk_family;
548         r->idiag_state = TCP_SYN_RECV;
549         r->idiag_timer = 1;
550         r->idiag_retrans = req->retrans;
551
552         r->id.idiag_if = sk->sk_bound_dev_if;
553         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
554         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
555
556         tmo = req->expires - jiffies;
557         if (tmo < 0)
558                 tmo = 0;
559
560         r->id.idiag_sport = inet->sport;
561         r->id.idiag_dport = ireq->rmt_port;
562         r->id.idiag_src[0] = ireq->loc_addr;
563         r->id.idiag_dst[0] = ireq->rmt_addr;
564         r->idiag_expires = jiffies_to_msecs(tmo);
565         r->idiag_rqueue = 0;
566         r->idiag_wqueue = 0;
567         r->idiag_uid = sock_i_uid(sk);
568         r->idiag_inode = 0;
569 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
570         if (r->idiag_family == AF_INET6) {
571                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
572                                &inet6_rsk(req)->loc_addr);
573                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
574                                &inet6_rsk(req)->rmt_addr);
575         }
576 #endif
577         nlh->nlmsg_len = skb->tail - b;
578
579         return skb->len;
580
581 nlmsg_failure:
582         skb_trim(skb, b - skb->data);
583         return -1;
584 }
585
586 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
587                                struct netlink_callback *cb)
588 {
589         struct inet_diag_entry entry;
590         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
591         struct inet_connection_sock *icsk = inet_csk(sk);
592         struct listen_sock *lopt;
593         struct rtattr *bc = NULL;
594         struct inet_sock *inet = inet_sk(sk);
595         int j, s_j;
596         int reqnum, s_reqnum;
597         int err = 0;
598
599         s_j = cb->args[3];
600         s_reqnum = cb->args[4];
601
602         if (s_j > 0)
603                 s_j--;
604
605         entry.family = sk->sk_family;
606
607         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
608
609         lopt = icsk->icsk_accept_queue.listen_opt;
610         if (!lopt || !lopt->qlen)
611                 goto out;
612
613         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
614                 bc = (struct rtattr *)(r + 1);
615                 entry.sport = inet->num;
616                 entry.userlocks = sk->sk_userlocks;
617         }
618
619         for (j = s_j; j < lopt->nr_table_entries; j++) {
620                 struct request_sock *req, *head = lopt->syn_table[j];
621
622                 reqnum = 0;
623                 for (req = head; req; reqnum++, req = req->dl_next) {
624                         struct inet_request_sock *ireq = inet_rsk(req);
625
626                         if (reqnum < s_reqnum)
627                                 continue;
628                         if (r->id.idiag_dport != ireq->rmt_port &&
629                             r->id.idiag_dport)
630                                 continue;
631
632                         if (bc) {
633                                 entry.saddr =
634 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
635                                         (entry.family == AF_INET6) ?
636                                         inet6_rsk(req)->loc_addr.s6_addr32 :
637 #endif
638                                         &ireq->loc_addr;
639                                 entry.daddr =
640 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
641                                         (entry.family == AF_INET6) ?
642                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
643 #endif
644                                         &ireq->rmt_addr;
645                                 entry.dport = ntohs(ireq->rmt_port);
646
647                                 if (!inet_diag_bc_run(RTA_DATA(bc),
648                                                     RTA_PAYLOAD(bc), &entry))
649                                         continue;
650                         }
651
652                         err = inet_diag_fill_req(skb, sk, req,
653                                                NETLINK_CB(cb->skb).pid,
654                                                cb->nlh->nlmsg_seq, cb->nlh);
655                         if (err < 0) {
656                                 cb->args[3] = j + 1;
657                                 cb->args[4] = reqnum;
658                                 goto out;
659                         }
660                 }
661
662                 s_reqnum = 0;
663         }
664
665 out:
666         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
667
668         return err;
669 }
670
671 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
672 {
673         int i, num;
674         int s_i, s_num;
675         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
676         const struct inet_diag_handler *handler;
677         struct inet_hashinfo *hashinfo;
678
679         handler = inet_diag_table[cb->nlh->nlmsg_type];
680         BUG_ON(handler == NULL);
681         hashinfo = handler->idiag_hashinfo;
682
683         s_i = cb->args[1];
684         s_num = num = cb->args[2];
685
686         if (cb->args[0] == 0) {
687                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
688                         goto skip_listen_ht;
689
690                 inet_listen_lock(hashinfo);
691                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
692                         struct sock *sk;
693                         struct hlist_node *node;
694
695                         num = 0;
696                         sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
697                                 struct inet_sock *inet = inet_sk(sk);
698
699                                 if (num < s_num) {
700                                         num++;
701                                         continue;
702                                 }
703
704                                 if (r->id.idiag_sport != inet->sport &&
705                                     r->id.idiag_sport)
706                                         goto next_listen;
707
708                                 if (!(r->idiag_states & TCPF_LISTEN) ||
709                                     r->id.idiag_dport ||
710                                     cb->args[3] > 0)
711                                         goto syn_recv;
712
713                                 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
714                                         inet_listen_unlock(hashinfo);
715                                         goto done;
716                                 }
717
718 syn_recv:
719                                 if (!(r->idiag_states & TCPF_SYN_RECV))
720                                         goto next_listen;
721
722                                 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
723                                         inet_listen_unlock(hashinfo);
724                                         goto done;
725                                 }
726
727 next_listen:
728                                 cb->args[3] = 0;
729                                 cb->args[4] = 0;
730                                 ++num;
731                         }
732
733                         s_num = 0;
734                         cb->args[3] = 0;
735                         cb->args[4] = 0;
736                 }
737                 inet_listen_unlock(hashinfo);
738 skip_listen_ht:
739                 cb->args[0] = 1;
740                 s_i = num = s_num = 0;
741         }
742
743         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
744                 return skb->len;
745
746         for (i = s_i; i < hashinfo->ehash_size; i++) {
747                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
748                 struct sock *sk;
749                 struct hlist_node *node;
750
751                 if (i > s_i)
752                         s_num = 0;
753
754                 read_lock_bh(&head->lock);
755                 num = 0;
756                 sk_for_each(sk, node, &head->chain) {
757                         struct inet_sock *inet = inet_sk(sk);
758
759                         if (num < s_num)
760                                 goto next_normal;
761                         if (!(r->idiag_states & (1 << sk->sk_state)))
762                                 goto next_normal;
763                         if (r->id.idiag_sport != inet->sport &&
764                             r->id.idiag_sport)
765                                 goto next_normal;
766                         if (r->id.idiag_dport != inet->dport &&
767                             r->id.idiag_dport)
768                                 goto next_normal;
769                         if (inet_csk_diag_dump(sk, skb, cb) < 0) {
770                                 read_unlock_bh(&head->lock);
771                                 goto done;
772                         }
773 next_normal:
774                         ++num;
775                 }
776
777                 if (r->idiag_states & TCPF_TIME_WAIT) {
778                         struct inet_timewait_sock *tw;
779
780                         inet_twsk_for_each(tw, node,
781                                     &head->twchain) {
782
783                                 if (num < s_num)
784                                         goto next_dying;
785                                 if (r->id.idiag_sport != tw->tw_sport &&
786                                     r->id.idiag_sport)
787                                         goto next_dying;
788                                 if (r->id.idiag_dport != tw->tw_dport &&
789                                     r->id.idiag_dport)
790                                         goto next_dying;
791                                 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
792                                         read_unlock_bh(&head->lock);
793                                         goto done;
794                                 }
795 next_dying:
796                                 ++num;
797                         }
798                 }
799                 read_unlock_bh(&head->lock);
800         }
801
802 done:
803         cb->args[1] = i;
804         cb->args[2] = num;
805         return skb->len;
806 }
807
808 static inline int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
809 {
810         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
811                 return 0;
812
813         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX)
814                 goto err_inval;
815
816         if (inet_diag_table[nlh->nlmsg_type] == NULL)
817                 return -ENOENT;
818
819         if (NLMSG_LENGTH(sizeof(struct inet_diag_req)) > skb->len)
820                 goto err_inval;
821
822         if (nlh->nlmsg_flags&NLM_F_DUMP) {
823                 if (nlh->nlmsg_len >
824                     (4 + NLMSG_SPACE(sizeof(struct inet_diag_req)))) {
825                         struct rtattr *rta = (void *)(NLMSG_DATA(nlh) +
826                                                  sizeof(struct inet_diag_req));
827                         if (rta->rta_type != INET_DIAG_REQ_BYTECODE ||
828                             rta->rta_len < 8 ||
829                             rta->rta_len >
830                             (nlh->nlmsg_len -
831                              NLMSG_SPACE(sizeof(struct inet_diag_req))))
832                                 goto err_inval;
833                         if (inet_diag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
834                                 goto err_inval;
835                 }
836                 return netlink_dump_start(idiagnl, skb, nlh,
837                                           inet_diag_dump, NULL);
838         } else
839                 return inet_diag_get_exact(skb, nlh);
840
841 err_inval:
842         return -EINVAL;
843 }
844
845
846 static inline void inet_diag_rcv_skb(struct sk_buff *skb)
847 {
848         if (skb->len >= NLMSG_SPACE(0)) {
849                 int err;
850                 struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data;
851
852                 if (nlh->nlmsg_len < sizeof(*nlh) ||
853                     skb->len < nlh->nlmsg_len)
854                         return;
855                 err = inet_diag_rcv_msg(skb, nlh);
856                 if (err || nlh->nlmsg_flags & NLM_F_ACK)
857                         netlink_ack(skb, nlh, err);
858         }
859 }
860
861 static void inet_diag_rcv(struct sock *sk, int len)
862 {
863         struct sk_buff *skb;
864         unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
865
866         while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
867                 inet_diag_rcv_skb(skb);
868                 kfree_skb(skb);
869         }
870 }
871
872 static DEFINE_SPINLOCK(inet_diag_register_lock);
873
874 int inet_diag_register(const struct inet_diag_handler *h)
875 {
876         const __u16 type = h->idiag_type;
877         int err = -EINVAL;
878
879         if (type >= INET_DIAG_GETSOCK_MAX)
880                 goto out;
881
882         spin_lock(&inet_diag_register_lock);
883         err = -EEXIST;
884         if (inet_diag_table[type] == NULL) {
885                 inet_diag_table[type] = h;
886                 err = 0;
887         }
888         spin_unlock(&inet_diag_register_lock);
889 out:
890         return err;
891 }
892 EXPORT_SYMBOL_GPL(inet_diag_register);
893
894 void inet_diag_unregister(const struct inet_diag_handler *h)
895 {
896         const __u16 type = h->idiag_type;
897
898         if (type >= INET_DIAG_GETSOCK_MAX)
899                 return;
900
901         spin_lock(&inet_diag_register_lock);
902         inet_diag_table[type] = NULL;
903         spin_unlock(&inet_diag_register_lock);
904
905         synchronize_rcu();
906 }
907 EXPORT_SYMBOL_GPL(inet_diag_unregister);
908
909 static int __init inet_diag_init(void)
910 {
911         const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
912                                           sizeof(struct inet_diag_handler *));
913         int err = -ENOMEM;
914
915         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
916         if (!inet_diag_table)
917                 goto out;
918
919         idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, 0, inet_diag_rcv,
920                                         THIS_MODULE);
921         if (idiagnl == NULL)
922                 goto out_free_table;
923         err = 0;
924 out:
925         return err;
926 out_free_table:
927         kfree(inet_diag_table);
928         goto out;
929 }
930
931 static void __exit inet_diag_exit(void)
932 {
933         sock_release(idiagnl->sk_socket);
934         kfree(inet_diag_table);
935 }
936
937 module_init(inet_diag_init);
938 module_exit(inet_diag_exit);
939 MODULE_LICENSE("GPL");