Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.git] / net / ipv4 / inet_diag.c
1 /*
2  * inet_diag.c  Module for monitoring INET transport protocols sockets.
3  *
4  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5  *
6  *      This program is free software; you can redistribute it and/or
7  *      modify it under the terms of the GNU General Public License
8  *      as published by the Free Software Foundation; either version
9  *      2 of the License, or (at your option) any later version.
10  */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/fcntl.h>
16 #include <linux/random.h>
17 #include <linux/slab.h>
18 #include <linux/cache.h>
19 #include <linux/init.h>
20 #include <linux/time.h>
21
22 #include <net/icmp.h>
23 #include <net/tcp.h>
24 #include <net/ipv6.h>
25 #include <net/inet_common.h>
26 #include <net/inet_connection_sock.h>
27 #include <net/inet_hashtables.h>
28 #include <net/inet_timewait_sock.h>
29 #include <net/inet6_hashtables.h>
30 #include <net/netlink.h>
31
32 #include <linux/inet.h>
33 #include <linux/stddef.h>
34
35 #include <linux/inet_diag.h>
36
37 static const struct inet_diag_handler **inet_diag_table;
38
39 struct inet_diag_entry {
40         __be32 *saddr;
41         __be32 *daddr;
42         u16 sport;
43         u16 dport;
44         u16 family;
45         u16 userlocks;
46 };
47
48 static struct sock *idiagnl;
49
50 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
51         RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
52
53 static DEFINE_MUTEX(inet_diag_table_mutex);
54
55 static const struct inet_diag_handler *inet_diag_lock_handler(int type)
56 {
57         if (!inet_diag_table[type])
58                 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
59                                NETLINK_INET_DIAG, type);
60
61         mutex_lock(&inet_diag_table_mutex);
62         if (!inet_diag_table[type])
63                 return ERR_PTR(-ENOENT);
64
65         return inet_diag_table[type];
66 }
67
68 static inline void inet_diag_unlock_handler(
69         const struct inet_diag_handler *handler)
70 {
71         mutex_unlock(&inet_diag_table_mutex);
72 }
73
74 static int inet_csk_diag_fill(struct sock *sk,
75                               struct sk_buff *skb,
76                               int ext, u32 pid, u32 seq, u16 nlmsg_flags,
77                               const struct nlmsghdr *unlh)
78 {
79         const struct inet_sock *inet = inet_sk(sk);
80         const struct inet_connection_sock *icsk = inet_csk(sk);
81         struct inet_diag_msg *r;
82         struct nlmsghdr  *nlh;
83         void *info = NULL;
84         struct inet_diag_meminfo  *minfo = NULL;
85         unsigned char    *b = skb_tail_pointer(skb);
86         const struct inet_diag_handler *handler;
87
88         handler = inet_diag_table[unlh->nlmsg_type];
89         BUG_ON(handler == NULL);
90
91         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
92         nlh->nlmsg_flags = nlmsg_flags;
93
94         r = NLMSG_DATA(nlh);
95         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
96
97         if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
98                 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
99
100         if (ext & (1 << (INET_DIAG_INFO - 1)))
101                 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
102                                      handler->idiag_info_size);
103
104         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
105                 const size_t len = strlen(icsk->icsk_ca_ops->name);
106
107                 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
108                        icsk->icsk_ca_ops->name);
109         }
110
111         r->idiag_family = sk->sk_family;
112         r->idiag_state = sk->sk_state;
113         r->idiag_timer = 0;
114         r->idiag_retrans = 0;
115
116         r->id.idiag_if = sk->sk_bound_dev_if;
117         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
118         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
119
120         r->id.idiag_sport = inet->inet_sport;
121         r->id.idiag_dport = inet->inet_dport;
122         r->id.idiag_src[0] = inet->inet_rcv_saddr;
123         r->id.idiag_dst[0] = inet->inet_daddr;
124
125 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
126         if (r->idiag_family == AF_INET6) {
127                 const struct ipv6_pinfo *np = inet6_sk(sk);
128
129                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
130                                &np->rcv_saddr);
131                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
132                                &np->daddr);
133         }
134 #endif
135
136 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
137
138         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
139                 r->idiag_timer = 1;
140                 r->idiag_retrans = icsk->icsk_retransmits;
141                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
142         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
143                 r->idiag_timer = 4;
144                 r->idiag_retrans = icsk->icsk_probes_out;
145                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
146         } else if (timer_pending(&sk->sk_timer)) {
147                 r->idiag_timer = 2;
148                 r->idiag_retrans = icsk->icsk_probes_out;
149                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
150         } else {
151                 r->idiag_timer = 0;
152                 r->idiag_expires = 0;
153         }
154 #undef EXPIRES_IN_MS
155
156         r->idiag_uid = sock_i_uid(sk);
157         r->idiag_inode = sock_i_ino(sk);
158
159         if (minfo) {
160                 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
161                 minfo->idiag_wmem = sk->sk_wmem_queued;
162                 minfo->idiag_fmem = sk->sk_forward_alloc;
163                 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
164         }
165
166         handler->idiag_get_info(sk, r, info);
167
168         if (sk->sk_state < TCP_TIME_WAIT &&
169             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
170                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
171
172         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
173         return skb->len;
174
175 rtattr_failure:
176 nlmsg_failure:
177         nlmsg_trim(skb, b);
178         return -EMSGSIZE;
179 }
180
181 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
182                                struct sk_buff *skb, int ext, u32 pid,
183                                u32 seq, u16 nlmsg_flags,
184                                const struct nlmsghdr *unlh)
185 {
186         long tmo;
187         struct inet_diag_msg *r;
188         const unsigned char *previous_tail = skb_tail_pointer(skb);
189         struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
190                                          unlh->nlmsg_type, sizeof(*r));
191
192         r = NLMSG_DATA(nlh);
193         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
194
195         nlh->nlmsg_flags = nlmsg_flags;
196
197         tmo = tw->tw_ttd - jiffies;
198         if (tmo < 0)
199                 tmo = 0;
200
201         r->idiag_family       = tw->tw_family;
202         r->idiag_retrans      = 0;
203         r->id.idiag_if        = tw->tw_bound_dev_if;
204         r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
205         r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
206         r->id.idiag_sport     = tw->tw_sport;
207         r->id.idiag_dport     = tw->tw_dport;
208         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
209         r->id.idiag_dst[0]    = tw->tw_daddr;
210         r->idiag_state        = tw->tw_substate;
211         r->idiag_timer        = 3;
212         r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
213         r->idiag_rqueue       = 0;
214         r->idiag_wqueue       = 0;
215         r->idiag_uid          = 0;
216         r->idiag_inode        = 0;
217 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
218         if (tw->tw_family == AF_INET6) {
219                 const struct inet6_timewait_sock *tw6 =
220                                                 inet6_twsk((struct sock *)tw);
221
222                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
223                                &tw6->tw_v6_rcv_saddr);
224                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
225                                &tw6->tw_v6_daddr);
226         }
227 #endif
228         nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
229         return skb->len;
230 nlmsg_failure:
231         nlmsg_trim(skb, previous_tail);
232         return -EMSGSIZE;
233 }
234
235 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
236                         int ext, u32 pid, u32 seq, u16 nlmsg_flags,
237                         const struct nlmsghdr *unlh)
238 {
239         if (sk->sk_state == TCP_TIME_WAIT)
240                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
241                                            skb, ext, pid, seq, nlmsg_flags,
242                                            unlh);
243         return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
244 }
245
246 static int inet_diag_get_exact(struct sk_buff *in_skb,
247                                const struct nlmsghdr *nlh)
248 {
249         int err;
250         struct sock *sk;
251         struct inet_diag_req *req = NLMSG_DATA(nlh);
252         struct sk_buff *rep;
253         struct inet_hashinfo *hashinfo;
254         const struct inet_diag_handler *handler;
255
256         handler = inet_diag_lock_handler(nlh->nlmsg_type);
257         if (IS_ERR(handler)) {
258                 err = PTR_ERR(handler);
259                 goto unlock;
260         }
261
262         hashinfo = handler->idiag_hashinfo;
263         err = -EINVAL;
264
265         if (req->idiag_family == AF_INET) {
266                 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
267                                  req->id.idiag_dport, req->id.idiag_src[0],
268                                  req->id.idiag_sport, req->id.idiag_if);
269         }
270 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
271         else if (req->idiag_family == AF_INET6) {
272                 sk = inet6_lookup(&init_net, hashinfo,
273                                   (struct in6_addr *)req->id.idiag_dst,
274                                   req->id.idiag_dport,
275                                   (struct in6_addr *)req->id.idiag_src,
276                                   req->id.idiag_sport,
277                                   req->id.idiag_if);
278         }
279 #endif
280         else {
281                 goto unlock;
282         }
283
284         err = -ENOENT;
285         if (sk == NULL)
286                 goto unlock;
287
288         err = -ESTALE;
289         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
290              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
291             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
292              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
293                 goto out;
294
295         err = -ENOMEM;
296         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
297                                      sizeof(struct inet_diag_meminfo) +
298                                      handler->idiag_info_size + 64)),
299                         GFP_KERNEL);
300         if (!rep)
301                 goto out;
302
303         err = sk_diag_fill(sk, rep, req->idiag_ext,
304                            NETLINK_CB(in_skb).pid,
305                            nlh->nlmsg_seq, 0, nlh);
306         if (err < 0) {
307                 WARN_ON(err == -EMSGSIZE);
308                 kfree_skb(rep);
309                 goto out;
310         }
311         err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
312                               MSG_DONTWAIT);
313         if (err > 0)
314                 err = 0;
315
316 out:
317         if (sk) {
318                 if (sk->sk_state == TCP_TIME_WAIT)
319                         inet_twsk_put((struct inet_timewait_sock *)sk);
320                 else
321                         sock_put(sk);
322         }
323 unlock:
324         inet_diag_unlock_handler(handler);
325         return err;
326 }
327
328 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
329 {
330         int words = bits >> 5;
331
332         bits &= 0x1f;
333
334         if (words) {
335                 if (memcmp(a1, a2, words << 2))
336                         return 0;
337         }
338         if (bits) {
339                 __be32 w1, w2;
340                 __be32 mask;
341
342                 w1 = a1[words];
343                 w2 = a2[words];
344
345                 mask = htonl((0xffffffff) << (32 - bits));
346
347                 if ((w1 ^ w2) & mask)
348                         return 0;
349         }
350
351         return 1;
352 }
353
354
355 static int inet_diag_bc_run(const void *bc, int len,
356                             const struct inet_diag_entry *entry)
357 {
358         while (len > 0) {
359                 int yes = 1;
360                 const struct inet_diag_bc_op *op = bc;
361
362                 switch (op->code) {
363                 case INET_DIAG_BC_NOP:
364                         break;
365                 case INET_DIAG_BC_JMP:
366                         yes = 0;
367                         break;
368                 case INET_DIAG_BC_S_GE:
369                         yes = entry->sport >= op[1].no;
370                         break;
371                 case INET_DIAG_BC_S_LE:
372                         yes = entry->sport <= op[1].no;
373                         break;
374                 case INET_DIAG_BC_D_GE:
375                         yes = entry->dport >= op[1].no;
376                         break;
377                 case INET_DIAG_BC_D_LE:
378                         yes = entry->dport <= op[1].no;
379                         break;
380                 case INET_DIAG_BC_AUTO:
381                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
382                         break;
383                 case INET_DIAG_BC_S_COND:
384                 case INET_DIAG_BC_D_COND: {
385                         struct inet_diag_hostcond *cond;
386                         __be32 *addr;
387
388                         cond = (struct inet_diag_hostcond *)(op + 1);
389                         if (cond->port != -1 &&
390                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
391                                              entry->sport : entry->dport)) {
392                                 yes = 0;
393                                 break;
394                         }
395
396                         if (cond->prefix_len == 0)
397                                 break;
398
399                         if (op->code == INET_DIAG_BC_S_COND)
400                                 addr = entry->saddr;
401                         else
402                                 addr = entry->daddr;
403
404                         if (bitstring_match(addr, cond->addr,
405                                             cond->prefix_len))
406                                 break;
407                         if (entry->family == AF_INET6 &&
408                             cond->family == AF_INET) {
409                                 if (addr[0] == 0 && addr[1] == 0 &&
410                                     addr[2] == htonl(0xffff) &&
411                                     bitstring_match(addr + 3, cond->addr,
412                                                     cond->prefix_len))
413                                         break;
414                         }
415                         yes = 0;
416                         break;
417                 }
418                 }
419
420                 if (yes) {
421                         len -= op->yes;
422                         bc += op->yes;
423                 } else {
424                         len -= op->no;
425                         bc += op->no;
426                 }
427         }
428         return len == 0;
429 }
430
431 static int valid_cc(const void *bc, int len, int cc)
432 {
433         while (len >= 0) {
434                 const struct inet_diag_bc_op *op = bc;
435
436                 if (cc > len)
437                         return 0;
438                 if (cc == len)
439                         return 1;
440                 if (op->yes < 4)
441                         return 0;
442                 len -= op->yes;
443                 bc  += op->yes;
444         }
445         return 0;
446 }
447
448 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
449 {
450         const unsigned char *bc = bytecode;
451         int  len = bytecode_len;
452
453         while (len > 0) {
454                 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
455
456 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
457                 switch (op->code) {
458                 case INET_DIAG_BC_AUTO:
459                 case INET_DIAG_BC_S_COND:
460                 case INET_DIAG_BC_D_COND:
461                 case INET_DIAG_BC_S_GE:
462                 case INET_DIAG_BC_S_LE:
463                 case INET_DIAG_BC_D_GE:
464                 case INET_DIAG_BC_D_LE:
465                         if (op->yes < 4 || op->yes > len + 4)
466                                 return -EINVAL;
467                 case INET_DIAG_BC_JMP:
468                         if (op->no < 4 || op->no > len + 4)
469                                 return -EINVAL;
470                         if (op->no < len &&
471                             !valid_cc(bytecode, bytecode_len, len - op->no))
472                                 return -EINVAL;
473                         break;
474                 case INET_DIAG_BC_NOP:
475                         if (op->yes < 4 || op->yes > len + 4)
476                                 return -EINVAL;
477                         break;
478                 default:
479                         return -EINVAL;
480                 }
481                 bc  += op->yes;
482                 len -= op->yes;
483         }
484         return len == 0 ? 0 : -EINVAL;
485 }
486
487 static int inet_csk_diag_dump(struct sock *sk,
488                               struct sk_buff *skb,
489                               struct netlink_callback *cb)
490 {
491         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
492
493         if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
494                 struct inet_diag_entry entry;
495                 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
496                                                           sizeof(*r),
497                                                           INET_DIAG_REQ_BYTECODE);
498                 struct inet_sock *inet = inet_sk(sk);
499
500                 entry.family = sk->sk_family;
501 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
502                 if (entry.family == AF_INET6) {
503                         struct ipv6_pinfo *np = inet6_sk(sk);
504
505                         entry.saddr = np->rcv_saddr.s6_addr32;
506                         entry.daddr = np->daddr.s6_addr32;
507                 } else
508 #endif
509                 {
510                         entry.saddr = &inet->inet_rcv_saddr;
511                         entry.daddr = &inet->inet_daddr;
512                 }
513                 entry.sport = inet->inet_num;
514                 entry.dport = ntohs(inet->inet_dport);
515                 entry.userlocks = sk->sk_userlocks;
516
517                 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
518                         return 0;
519         }
520
521         return inet_csk_diag_fill(sk, skb, r->idiag_ext,
522                                   NETLINK_CB(cb->skb).pid,
523                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
524 }
525
526 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
527                                struct sk_buff *skb,
528                                struct netlink_callback *cb)
529 {
530         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
531
532         if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
533                 struct inet_diag_entry entry;
534                 const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
535                                                           sizeof(*r),
536                                                           INET_DIAG_REQ_BYTECODE);
537
538                 entry.family = tw->tw_family;
539 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
540                 if (tw->tw_family == AF_INET6) {
541                         struct inet6_timewait_sock *tw6 =
542                                                 inet6_twsk((struct sock *)tw);
543                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
544                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
545                 } else
546 #endif
547                 {
548                         entry.saddr = &tw->tw_rcv_saddr;
549                         entry.daddr = &tw->tw_daddr;
550                 }
551                 entry.sport = tw->tw_num;
552                 entry.dport = ntohs(tw->tw_dport);
553                 entry.userlocks = 0;
554
555                 if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))
556                         return 0;
557         }
558
559         return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
560                                    NETLINK_CB(cb->skb).pid,
561                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
562 }
563
564 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
565                               struct request_sock *req, u32 pid, u32 seq,
566                               const struct nlmsghdr *unlh)
567 {
568         const struct inet_request_sock *ireq = inet_rsk(req);
569         struct inet_sock *inet = inet_sk(sk);
570         unsigned char *b = skb_tail_pointer(skb);
571         struct inet_diag_msg *r;
572         struct nlmsghdr *nlh;
573         long tmo;
574
575         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
576         nlh->nlmsg_flags = NLM_F_MULTI;
577         r = NLMSG_DATA(nlh);
578
579         r->idiag_family = sk->sk_family;
580         r->idiag_state = TCP_SYN_RECV;
581         r->idiag_timer = 1;
582         r->idiag_retrans = req->retrans;
583
584         r->id.idiag_if = sk->sk_bound_dev_if;
585         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
586         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
587
588         tmo = req->expires - jiffies;
589         if (tmo < 0)
590                 tmo = 0;
591
592         r->id.idiag_sport = inet->inet_sport;
593         r->id.idiag_dport = ireq->rmt_port;
594         r->id.idiag_src[0] = ireq->loc_addr;
595         r->id.idiag_dst[0] = ireq->rmt_addr;
596         r->idiag_expires = jiffies_to_msecs(tmo);
597         r->idiag_rqueue = 0;
598         r->idiag_wqueue = 0;
599         r->idiag_uid = sock_i_uid(sk);
600         r->idiag_inode = 0;
601 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
602         if (r->idiag_family == AF_INET6) {
603                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
604                                &inet6_rsk(req)->loc_addr);
605                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
606                                &inet6_rsk(req)->rmt_addr);
607         }
608 #endif
609         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
610
611         return skb->len;
612
613 nlmsg_failure:
614         nlmsg_trim(skb, b);
615         return -1;
616 }
617
618 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
619                                struct netlink_callback *cb)
620 {
621         struct inet_diag_entry entry;
622         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
623         struct inet_connection_sock *icsk = inet_csk(sk);
624         struct listen_sock *lopt;
625         const struct nlattr *bc = NULL;
626         struct inet_sock *inet = inet_sk(sk);
627         int j, s_j;
628         int reqnum, s_reqnum;
629         int err = 0;
630
631         s_j = cb->args[3];
632         s_reqnum = cb->args[4];
633
634         if (s_j > 0)
635                 s_j--;
636
637         entry.family = sk->sk_family;
638
639         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
640
641         lopt = icsk->icsk_accept_queue.listen_opt;
642         if (!lopt || !lopt->qlen)
643                 goto out;
644
645         if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
646                 bc = nlmsg_find_attr(cb->nlh, sizeof(*r),
647                                      INET_DIAG_REQ_BYTECODE);
648                 entry.sport = inet->inet_num;
649                 entry.userlocks = sk->sk_userlocks;
650         }
651
652         for (j = s_j; j < lopt->nr_table_entries; j++) {
653                 struct request_sock *req, *head = lopt->syn_table[j];
654
655                 reqnum = 0;
656                 for (req = head; req; reqnum++, req = req->dl_next) {
657                         struct inet_request_sock *ireq = inet_rsk(req);
658
659                         if (reqnum < s_reqnum)
660                                 continue;
661                         if (r->id.idiag_dport != ireq->rmt_port &&
662                             r->id.idiag_dport)
663                                 continue;
664
665                         if (bc) {
666                                 entry.saddr =
667 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
668                                         (entry.family == AF_INET6) ?
669                                         inet6_rsk(req)->loc_addr.s6_addr32 :
670 #endif
671                                         &ireq->loc_addr;
672                                 entry.daddr =
673 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
674                                         (entry.family == AF_INET6) ?
675                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
676 #endif
677                                         &ireq->rmt_addr;
678                                 entry.dport = ntohs(ireq->rmt_port);
679
680                                 if (!inet_diag_bc_run(nla_data(bc),
681                                                       nla_len(bc), &entry))
682                                         continue;
683                         }
684
685                         err = inet_diag_fill_req(skb, sk, req,
686                                                NETLINK_CB(cb->skb).pid,
687                                                cb->nlh->nlmsg_seq, cb->nlh);
688                         if (err < 0) {
689                                 cb->args[3] = j + 1;
690                                 cb->args[4] = reqnum;
691                                 goto out;
692                         }
693                 }
694
695                 s_reqnum = 0;
696         }
697
698 out:
699         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
700
701         return err;
702 }
703
704 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
705 {
706         int i, num;
707         int s_i, s_num;
708         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
709         const struct inet_diag_handler *handler;
710         struct inet_hashinfo *hashinfo;
711
712         handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
713         if (IS_ERR(handler))
714                 goto unlock;
715
716         hashinfo = handler->idiag_hashinfo;
717
718         s_i = cb->args[1];
719         s_num = num = cb->args[2];
720
721         if (cb->args[0] == 0) {
722                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
723                         goto skip_listen_ht;
724
725                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
726                         struct sock *sk;
727                         struct hlist_nulls_node *node;
728                         struct inet_listen_hashbucket *ilb;
729
730                         num = 0;
731                         ilb = &hashinfo->listening_hash[i];
732                         spin_lock_bh(&ilb->lock);
733                         sk_nulls_for_each(sk, node, &ilb->head) {
734                                 struct inet_sock *inet = inet_sk(sk);
735
736                                 if (num < s_num) {
737                                         num++;
738                                         continue;
739                                 }
740
741                                 if (r->id.idiag_sport != inet->inet_sport &&
742                                     r->id.idiag_sport)
743                                         goto next_listen;
744
745                                 if (!(r->idiag_states & TCPF_LISTEN) ||
746                                     r->id.idiag_dport ||
747                                     cb->args[3] > 0)
748                                         goto syn_recv;
749
750                                 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
751                                         spin_unlock_bh(&ilb->lock);
752                                         goto done;
753                                 }
754
755 syn_recv:
756                                 if (!(r->idiag_states & TCPF_SYN_RECV))
757                                         goto next_listen;
758
759                                 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
760                                         spin_unlock_bh(&ilb->lock);
761                                         goto done;
762                                 }
763
764 next_listen:
765                                 cb->args[3] = 0;
766                                 cb->args[4] = 0;
767                                 ++num;
768                         }
769                         spin_unlock_bh(&ilb->lock);
770
771                         s_num = 0;
772                         cb->args[3] = 0;
773                         cb->args[4] = 0;
774                 }
775 skip_listen_ht:
776                 cb->args[0] = 1;
777                 s_i = num = s_num = 0;
778         }
779
780         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
781                 goto unlock;
782
783         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
784                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
785                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
786                 struct sock *sk;
787                 struct hlist_nulls_node *node;
788
789                 num = 0;
790
791                 if (hlist_nulls_empty(&head->chain) &&
792                         hlist_nulls_empty(&head->twchain))
793                         continue;
794
795                 if (i > s_i)
796                         s_num = 0;
797
798                 spin_lock_bh(lock);
799                 sk_nulls_for_each(sk, node, &head->chain) {
800                         struct inet_sock *inet = inet_sk(sk);
801
802                         if (num < s_num)
803                                 goto next_normal;
804                         if (!(r->idiag_states & (1 << sk->sk_state)))
805                                 goto next_normal;
806                         if (r->id.idiag_sport != inet->inet_sport &&
807                             r->id.idiag_sport)
808                                 goto next_normal;
809                         if (r->id.idiag_dport != inet->inet_dport &&
810                             r->id.idiag_dport)
811                                 goto next_normal;
812                         if (inet_csk_diag_dump(sk, skb, cb) < 0) {
813                                 spin_unlock_bh(lock);
814                                 goto done;
815                         }
816 next_normal:
817                         ++num;
818                 }
819
820                 if (r->idiag_states & TCPF_TIME_WAIT) {
821                         struct inet_timewait_sock *tw;
822
823                         inet_twsk_for_each(tw, node,
824                                     &head->twchain) {
825
826                                 if (num < s_num)
827                                         goto next_dying;
828                                 if (r->id.idiag_sport != tw->tw_sport &&
829                                     r->id.idiag_sport)
830                                         goto next_dying;
831                                 if (r->id.idiag_dport != tw->tw_dport &&
832                                     r->id.idiag_dport)
833                                         goto next_dying;
834                                 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
835                                         spin_unlock_bh(lock);
836                                         goto done;
837                                 }
838 next_dying:
839                                 ++num;
840                         }
841                 }
842                 spin_unlock_bh(lock);
843         }
844
845 done:
846         cb->args[1] = i;
847         cb->args[2] = num;
848 unlock:
849         inet_diag_unlock_handler(handler);
850         return skb->len;
851 }
852
853 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
854 {
855         int hdrlen = sizeof(struct inet_diag_req);
856
857         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
858             nlmsg_len(nlh) < hdrlen)
859                 return -EINVAL;
860
861         if (nlh->nlmsg_flags & NLM_F_DUMP) {
862                 if (nlmsg_attrlen(nlh, hdrlen)) {
863                         struct nlattr *attr;
864
865                         attr = nlmsg_find_attr(nlh, hdrlen,
866                                                INET_DIAG_REQ_BYTECODE);
867                         if (attr == NULL ||
868                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
869                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
870                                 return -EINVAL;
871                 }
872
873                 return netlink_dump_start(idiagnl, skb, nlh,
874                                           inet_diag_dump, NULL);
875         }
876
877         return inet_diag_get_exact(skb, nlh);
878 }
879
880 static DEFINE_MUTEX(inet_diag_mutex);
881
882 static void inet_diag_rcv(struct sk_buff *skb)
883 {
884         mutex_lock(&inet_diag_mutex);
885         netlink_rcv_skb(skb, &inet_diag_rcv_msg);
886         mutex_unlock(&inet_diag_mutex);
887 }
888
889 int inet_diag_register(const struct inet_diag_handler *h)
890 {
891         const __u16 type = h->idiag_type;
892         int err = -EINVAL;
893
894         if (type >= INET_DIAG_GETSOCK_MAX)
895                 goto out;
896
897         mutex_lock(&inet_diag_table_mutex);
898         err = -EEXIST;
899         if (inet_diag_table[type] == NULL) {
900                 inet_diag_table[type] = h;
901                 err = 0;
902         }
903         mutex_unlock(&inet_diag_table_mutex);
904 out:
905         return err;
906 }
907 EXPORT_SYMBOL_GPL(inet_diag_register);
908
909 void inet_diag_unregister(const struct inet_diag_handler *h)
910 {
911         const __u16 type = h->idiag_type;
912
913         if (type >= INET_DIAG_GETSOCK_MAX)
914                 return;
915
916         mutex_lock(&inet_diag_table_mutex);
917         inet_diag_table[type] = NULL;
918         mutex_unlock(&inet_diag_table_mutex);
919 }
920 EXPORT_SYMBOL_GPL(inet_diag_unregister);
921
922 static int __init inet_diag_init(void)
923 {
924         const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
925                                           sizeof(struct inet_diag_handler *));
926         int err = -ENOMEM;
927
928         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
929         if (!inet_diag_table)
930                 goto out;
931
932         idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
933                                         inet_diag_rcv, NULL, THIS_MODULE);
934         if (idiagnl == NULL)
935                 goto out_free_table;
936         err = 0;
937 out:
938         return err;
939 out_free_table:
940         kfree(inet_diag_table);
941         goto out;
942 }
943
944 static void __exit inet_diag_exit(void)
945 {
946         netlink_kernel_release(idiagnl);
947         kfree(inet_diag_table);
948 }
949
950 module_init(inet_diag_init);
951 module_exit(inet_diag_exit);
952 MODULE_LICENSE("GPL");
953 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);