cb73fdefba91e14820a566fe0e599a05e6956de3
[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/cache.h>
18 #include <linux/init.h>
19 #include <linux/time.h>
20
21 #include <net/icmp.h>
22 #include <net/tcp.h>
23 #include <net/ipv6.h>
24 #include <net/inet_common.h>
25 #include <net/inet_connection_sock.h>
26 #include <net/inet_hashtables.h>
27 #include <net/inet_timewait_sock.h>
28 #include <net/inet6_hashtables.h>
29 #include <net/netlink.h>
30
31 #include <linux/inet.h>
32 #include <linux/stddef.h>
33
34 #include <linux/inet_diag.h>
35
36 static const struct inet_diag_handler **inet_diag_table;
37
38 struct inet_diag_entry {
39         __be32 *saddr;
40         __be32 *daddr;
41         u16 sport;
42         u16 dport;
43         u16 family;
44         u16 userlocks;
45 };
46
47 static struct sock *idiagnl;
48
49 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
50         RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
51
52 static DEFINE_MUTEX(inet_diag_table_mutex);
53
54 static const struct inet_diag_handler *inet_diag_lock_handler(int type)
55 {
56         if (!inet_diag_table[type])
57                 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
58                                NETLINK_INET_DIAG, type);
59
60         mutex_lock(&inet_diag_table_mutex);
61         if (!inet_diag_table[type])
62                 return ERR_PTR(-ENOENT);
63
64         return inet_diag_table[type];
65 }
66
67 static inline void inet_diag_unlock_handler(
68         const struct inet_diag_handler *handler)
69 {
70         mutex_unlock(&inet_diag_table_mutex);
71 }
72
73 static int inet_csk_diag_fill(struct sock *sk,
74                               struct sk_buff *skb,
75                               int ext, u32 pid, u32 seq, u16 nlmsg_flags,
76                               const struct nlmsghdr *unlh)
77 {
78         const struct inet_sock *inet = inet_sk(sk);
79         const struct inet_connection_sock *icsk = inet_csk(sk);
80         struct inet_diag_msg *r;
81         struct nlmsghdr  *nlh;
82         void *info = NULL;
83         struct inet_diag_meminfo  *minfo = NULL;
84         unsigned char    *b = skb_tail_pointer(skb);
85         const struct inet_diag_handler *handler;
86
87         handler = inet_diag_table[unlh->nlmsg_type];
88         BUG_ON(handler == NULL);
89
90         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
91         nlh->nlmsg_flags = nlmsg_flags;
92
93         r = NLMSG_DATA(nlh);
94         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
95
96         if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
97                 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
98
99         if (ext & (1 << (INET_DIAG_INFO - 1)))
100                 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
101                                      handler->idiag_info_size);
102
103         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
104                 const size_t len = strlen(icsk->icsk_ca_ops->name);
105
106                 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
107                        icsk->icsk_ca_ops->name);
108         }
109
110         r->idiag_family = sk->sk_family;
111         r->idiag_state = sk->sk_state;
112         r->idiag_timer = 0;
113         r->idiag_retrans = 0;
114
115         r->id.idiag_if = sk->sk_bound_dev_if;
116         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
117         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
118
119         r->id.idiag_sport = inet->sport;
120         r->id.idiag_dport = inet->dport;
121         r->id.idiag_src[0] = inet->rcv_saddr;
122         r->id.idiag_dst[0] = inet->daddr;
123
124 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
125         if (r->idiag_family == AF_INET6) {
126                 struct ipv6_pinfo *np = inet6_sk(sk);
127
128                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
129                                &np->rcv_saddr);
130                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
131                                &np->daddr);
132         }
133 #endif
134
135 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
136
137         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
138                 r->idiag_timer = 1;
139                 r->idiag_retrans = icsk->icsk_retransmits;
140                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
141         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
142                 r->idiag_timer = 4;
143                 r->idiag_retrans = icsk->icsk_probes_out;
144                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
145         } else if (timer_pending(&sk->sk_timer)) {
146                 r->idiag_timer = 2;
147                 r->idiag_retrans = icsk->icsk_probes_out;
148                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
149         } else {
150                 r->idiag_timer = 0;
151                 r->idiag_expires = 0;
152         }
153 #undef EXPIRES_IN_MS
154
155         r->idiag_uid = sock_i_uid(sk);
156         r->idiag_inode = sock_i_ino(sk);
157
158         if (minfo) {
159                 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
160                 minfo->idiag_wmem = sk->sk_wmem_queued;
161                 minfo->idiag_fmem = sk->sk_forward_alloc;
162                 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
163         }
164
165         handler->idiag_get_info(sk, r, info);
166
167         if (sk->sk_state < TCP_TIME_WAIT &&
168             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
169                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
170
171         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
172         return skb->len;
173
174 rtattr_failure:
175 nlmsg_failure:
176         nlmsg_trim(skb, b);
177         return -EMSGSIZE;
178 }
179
180 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
181                                struct sk_buff *skb, int ext, u32 pid,
182                                u32 seq, u16 nlmsg_flags,
183                                const struct nlmsghdr *unlh)
184 {
185         long tmo;
186         struct inet_diag_msg *r;
187         const unsigned char *previous_tail = skb_tail_pointer(skb);
188         struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
189                                          unlh->nlmsg_type, sizeof(*r));
190
191         r = NLMSG_DATA(nlh);
192         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
193
194         nlh->nlmsg_flags = nlmsg_flags;
195
196         tmo = tw->tw_ttd - jiffies;
197         if (tmo < 0)
198                 tmo = 0;
199
200         r->idiag_family       = tw->tw_family;
201         r->idiag_retrans      = 0;
202         r->id.idiag_if        = tw->tw_bound_dev_if;
203         r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
204         r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
205         r->id.idiag_sport     = tw->tw_sport;
206         r->id.idiag_dport     = tw->tw_dport;
207         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
208         r->id.idiag_dst[0]    = tw->tw_daddr;
209         r->idiag_state        = tw->tw_substate;
210         r->idiag_timer        = 3;
211         r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
212         r->idiag_rqueue       = 0;
213         r->idiag_wqueue       = 0;
214         r->idiag_uid          = 0;
215         r->idiag_inode        = 0;
216 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
217         if (tw->tw_family == AF_INET6) {
218                 const struct inet6_timewait_sock *tw6 =
219                                                 inet6_twsk((struct sock *)tw);
220
221                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
222                                &tw6->tw_v6_rcv_saddr);
223                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
224                                &tw6->tw_v6_daddr);
225         }
226 #endif
227         nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
228         return skb->len;
229 nlmsg_failure:
230         nlmsg_trim(skb, previous_tail);
231         return -EMSGSIZE;
232 }
233
234 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
235                         int ext, u32 pid, u32 seq, u16 nlmsg_flags,
236                         const struct nlmsghdr *unlh)
237 {
238         if (sk->sk_state == TCP_TIME_WAIT)
239                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
240                                            skb, ext, pid, seq, nlmsg_flags,
241                                            unlh);
242         return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
243 }
244
245 static int inet_diag_get_exact(struct sk_buff *in_skb,
246                                const struct nlmsghdr *nlh)
247 {
248         int err;
249         struct sock *sk;
250         struct inet_diag_req *req = NLMSG_DATA(nlh);
251         struct sk_buff *rep;
252         struct inet_hashinfo *hashinfo;
253         const struct inet_diag_handler *handler;
254
255         handler = inet_diag_lock_handler(nlh->nlmsg_type);
256         if (IS_ERR(handler)) {
257                 err = PTR_ERR(handler);
258                 goto unlock;
259         }
260
261         hashinfo = handler->idiag_hashinfo;
262         err = -EINVAL;
263
264         if (req->idiag_family == AF_INET) {
265                 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
266                                  req->id.idiag_dport, req->id.idiag_src[0],
267                                  req->id.idiag_sport, req->id.idiag_if);
268         }
269 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
270         else if (req->idiag_family == AF_INET6) {
271                 sk = inet6_lookup(&init_net, hashinfo,
272                                   (struct in6_addr *)req->id.idiag_dst,
273                                   req->id.idiag_dport,
274                                   (struct in6_addr *)req->id.idiag_src,
275                                   req->id.idiag_sport,
276                                   req->id.idiag_if);
277         }
278 #endif
279         else {
280                 goto unlock;
281         }
282
283         err = -ENOENT;
284         if (sk == NULL)
285                 goto unlock;
286
287         err = -ESTALE;
288         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
289              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
290             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
291              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
292                 goto out;
293
294         err = -ENOMEM;
295         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
296                                      sizeof(struct inet_diag_meminfo) +
297                                      handler->idiag_info_size + 64)),
298                         GFP_KERNEL);
299         if (!rep)
300                 goto out;
301
302         err = sk_diag_fill(sk, rep, req->idiag_ext,
303                            NETLINK_CB(in_skb).pid,
304                            nlh->nlmsg_seq, 0, nlh);
305         if (err < 0) {
306                 WARN_ON(err == -EMSGSIZE);
307                 kfree_skb(rep);
308                 goto out;
309         }
310         err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
311                               MSG_DONTWAIT);
312         if (err > 0)
313                 err = 0;
314
315 out:
316         if (sk) {
317                 if (sk->sk_state == TCP_TIME_WAIT)
318                         inet_twsk_put((struct inet_timewait_sock *)sk);
319                 else
320                         sock_put(sk);
321         }
322 unlock:
323         inet_diag_unlock_handler(handler);
324         return err;
325 }
326
327 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
328 {
329         int words = bits >> 5;
330
331         bits &= 0x1f;
332
333         if (words) {
334                 if (memcmp(a1, a2, words << 2))
335                         return 0;
336         }
337         if (bits) {
338                 __be32 w1, w2;
339                 __be32 mask;
340
341                 w1 = a1[words];
342                 w2 = a2[words];
343
344                 mask = htonl((0xffffffff) << (32 - bits));
345
346                 if ((w1 ^ w2) & mask)
347                         return 0;
348         }
349
350         return 1;
351 }
352
353
354 static int inet_diag_bc_run(const void *bc, int len,
355                             const struct inet_diag_entry *entry)
356 {
357         while (len > 0) {
358                 int yes = 1;
359                 const struct inet_diag_bc_op *op = bc;
360
361                 switch (op->code) {
362                 case INET_DIAG_BC_NOP:
363                         break;
364                 case INET_DIAG_BC_JMP:
365                         yes = 0;
366                         break;
367                 case INET_DIAG_BC_S_GE:
368                         yes = entry->sport >= op[1].no;
369                         break;
370                 case INET_DIAG_BC_S_LE:
371                         yes = entry->dport <= op[1].no;
372                         break;
373                 case INET_DIAG_BC_D_GE:
374                         yes = entry->dport >= op[1].no;
375                         break;
376                 case INET_DIAG_BC_D_LE:
377                         yes = entry->dport <= op[1].no;
378                         break;
379                 case INET_DIAG_BC_AUTO:
380                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
381                         break;
382                 case INET_DIAG_BC_S_COND:
383                 case INET_DIAG_BC_D_COND: {
384                         struct inet_diag_hostcond *cond;
385                         __be32 *addr;
386
387                         cond = (struct inet_diag_hostcond *)(op + 1);
388                         if (cond->port != -1 &&
389                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
390                                              entry->sport : entry->dport)) {
391                                 yes = 0;
392                                 break;
393                         }
394
395                         if (cond->prefix_len == 0)
396                                 break;
397
398                         if (op->code == INET_DIAG_BC_S_COND)
399                                 addr = entry->saddr;
400                         else
401                                 addr = entry->daddr;
402
403                         if (bitstring_match(addr, cond->addr,
404                                             cond->prefix_len))
405                                 break;
406                         if (entry->family == AF_INET6 &&
407                             cond->family == AF_INET) {
408                                 if (addr[0] == 0 && addr[1] == 0 &&
409                                     addr[2] == htonl(0xffff) &&
410                                     bitstring_match(addr + 3, cond->addr,
411                                                     cond->prefix_len))
412                                         break;
413                         }
414                         yes = 0;
415                         break;
416                 }
417                 }
418
419                 if (yes) {
420                         len -= op->yes;
421                         bc += op->yes;
422                 } else {
423                         len -= op->no;
424                         bc += op->no;
425                 }
426         }
427         return (len == 0);
428 }
429
430 static int valid_cc(const void *bc, int len, int cc)
431 {
432         while (len >= 0) {
433                 const struct inet_diag_bc_op *op = bc;
434
435                 if (cc > len)
436                         return 0;
437                 if (cc == len)
438                         return 1;
439                 if (op->yes < 4)
440                         return 0;
441                 len -= op->yes;
442                 bc  += op->yes;
443         }
444         return 0;
445 }
446
447 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
448 {
449         const unsigned char *bc = bytecode;
450         int  len = bytecode_len;
451
452         while (len > 0) {
453                 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
454
455 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
456                 switch (op->code) {
457                 case INET_DIAG_BC_AUTO:
458                 case INET_DIAG_BC_S_COND:
459                 case INET_DIAG_BC_D_COND:
460                 case INET_DIAG_BC_S_GE:
461                 case INET_DIAG_BC_S_LE:
462                 case INET_DIAG_BC_D_GE:
463                 case INET_DIAG_BC_D_LE:
464                         if (op->yes < 4 || op->yes > len + 4)
465                                 return -EINVAL;
466                 case INET_DIAG_BC_JMP:
467                         if (op->no < 4 || op->no > len + 4)
468                                 return -EINVAL;
469                         if (op->no < len &&
470                             !valid_cc(bytecode, bytecode_len, len - op->no))
471                                 return -EINVAL;
472                         break;
473                 case INET_DIAG_BC_NOP:
474                         if (op->yes < 4 || op->yes > len + 4)
475                                 return -EINVAL;
476                         break;
477                 default:
478                         return -EINVAL;
479                 }
480                 bc  += op->yes;
481                 len -= op->yes;
482         }
483         return len == 0 ? 0 : -EINVAL;
484 }
485
486 static int inet_csk_diag_dump(struct sock *sk,
487                               struct sk_buff *skb,
488                               struct netlink_callback *cb)
489 {
490         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
491
492         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
493                 struct inet_diag_entry entry;
494                 struct rtattr *bc = (struct rtattr *)(r + 1);
495                 struct inet_sock *inet = inet_sk(sk);
496
497                 entry.family = sk->sk_family;
498 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
499                 if (entry.family == AF_INET6) {
500                         struct ipv6_pinfo *np = inet6_sk(sk);
501
502                         entry.saddr = np->rcv_saddr.s6_addr32;
503                         entry.daddr = np->daddr.s6_addr32;
504                 } else
505 #endif
506                 {
507                         entry.saddr = &inet->rcv_saddr;
508                         entry.daddr = &inet->daddr;
509                 }
510                 entry.sport = inet->num;
511                 entry.dport = ntohs(inet->dport);
512                 entry.userlocks = sk->sk_userlocks;
513
514                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
515                         return 0;
516         }
517
518         return inet_csk_diag_fill(sk, skb, r->idiag_ext,
519                                   NETLINK_CB(cb->skb).pid,
520                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
521 }
522
523 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
524                                struct sk_buff *skb,
525                                struct netlink_callback *cb)
526 {
527         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
528
529         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
530                 struct inet_diag_entry entry;
531                 struct rtattr *bc = (struct rtattr *)(r + 1);
532
533                 entry.family = tw->tw_family;
534 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
535                 if (tw->tw_family == AF_INET6) {
536                         struct inet6_timewait_sock *tw6 =
537                                                 inet6_twsk((struct sock *)tw);
538                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
539                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
540                 } else
541 #endif
542                 {
543                         entry.saddr = &tw->tw_rcv_saddr;
544                         entry.daddr = &tw->tw_daddr;
545                 }
546                 entry.sport = tw->tw_num;
547                 entry.dport = ntohs(tw->tw_dport);
548                 entry.userlocks = 0;
549
550                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
551                         return 0;
552         }
553
554         return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
555                                    NETLINK_CB(cb->skb).pid,
556                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
557 }
558
559 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
560                               struct request_sock *req, u32 pid, u32 seq,
561                               const struct nlmsghdr *unlh)
562 {
563         const struct inet_request_sock *ireq = inet_rsk(req);
564         struct inet_sock *inet = inet_sk(sk);
565         unsigned char *b = skb_tail_pointer(skb);
566         struct inet_diag_msg *r;
567         struct nlmsghdr *nlh;
568         long tmo;
569
570         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
571         nlh->nlmsg_flags = NLM_F_MULTI;
572         r = NLMSG_DATA(nlh);
573
574         r->idiag_family = sk->sk_family;
575         r->idiag_state = TCP_SYN_RECV;
576         r->idiag_timer = 1;
577         r->idiag_retrans = req->retrans;
578
579         r->id.idiag_if = sk->sk_bound_dev_if;
580         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
581         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
582
583         tmo = req->expires - jiffies;
584         if (tmo < 0)
585                 tmo = 0;
586
587         r->id.idiag_sport = inet->sport;
588         r->id.idiag_dport = ireq->rmt_port;
589         r->id.idiag_src[0] = ireq->loc_addr;
590         r->id.idiag_dst[0] = ireq->rmt_addr;
591         r->idiag_expires = jiffies_to_msecs(tmo);
592         r->idiag_rqueue = 0;
593         r->idiag_wqueue = 0;
594         r->idiag_uid = sock_i_uid(sk);
595         r->idiag_inode = 0;
596 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
597         if (r->idiag_family == AF_INET6) {
598                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
599                                &inet6_rsk(req)->loc_addr);
600                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
601                                &inet6_rsk(req)->rmt_addr);
602         }
603 #endif
604         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
605
606         return skb->len;
607
608 nlmsg_failure:
609         nlmsg_trim(skb, b);
610         return -1;
611 }
612
613 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
614                                struct netlink_callback *cb)
615 {
616         struct inet_diag_entry entry;
617         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
618         struct inet_connection_sock *icsk = inet_csk(sk);
619         struct listen_sock *lopt;
620         struct rtattr *bc = NULL;
621         struct inet_sock *inet = inet_sk(sk);
622         int j, s_j;
623         int reqnum, s_reqnum;
624         int err = 0;
625
626         s_j = cb->args[3];
627         s_reqnum = cb->args[4];
628
629         if (s_j > 0)
630                 s_j--;
631
632         entry.family = sk->sk_family;
633
634         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
635
636         lopt = icsk->icsk_accept_queue.listen_opt;
637         if (!lopt || !lopt->qlen)
638                 goto out;
639
640         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
641                 bc = (struct rtattr *)(r + 1);
642                 entry.sport = inet->num;
643                 entry.userlocks = sk->sk_userlocks;
644         }
645
646         for (j = s_j; j < lopt->nr_table_entries; j++) {
647                 struct request_sock *req, *head = lopt->syn_table[j];
648
649                 reqnum = 0;
650                 for (req = head; req; reqnum++, req = req->dl_next) {
651                         struct inet_request_sock *ireq = inet_rsk(req);
652
653                         if (reqnum < s_reqnum)
654                                 continue;
655                         if (r->id.idiag_dport != ireq->rmt_port &&
656                             r->id.idiag_dport)
657                                 continue;
658
659                         if (bc) {
660                                 entry.saddr =
661 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
662                                         (entry.family == AF_INET6) ?
663                                         inet6_rsk(req)->loc_addr.s6_addr32 :
664 #endif
665                                         &ireq->loc_addr;
666                                 entry.daddr =
667 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
668                                         (entry.family == AF_INET6) ?
669                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
670 #endif
671                                         &ireq->rmt_addr;
672                                 entry.dport = ntohs(ireq->rmt_port);
673
674                                 if (!inet_diag_bc_run(RTA_DATA(bc),
675                                                     RTA_PAYLOAD(bc), &entry))
676                                         continue;
677                         }
678
679                         err = inet_diag_fill_req(skb, sk, req,
680                                                NETLINK_CB(cb->skb).pid,
681                                                cb->nlh->nlmsg_seq, cb->nlh);
682                         if (err < 0) {
683                                 cb->args[3] = j + 1;
684                                 cb->args[4] = reqnum;
685                                 goto out;
686                         }
687                 }
688
689                 s_reqnum = 0;
690         }
691
692 out:
693         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
694
695         return err;
696 }
697
698 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
699 {
700         int i, num;
701         int s_i, s_num;
702         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
703         const struct inet_diag_handler *handler;
704         struct inet_hashinfo *hashinfo;
705
706         handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
707         if (IS_ERR(handler))
708                 goto unlock;
709
710         hashinfo = handler->idiag_hashinfo;
711
712         s_i = cb->args[1];
713         s_num = num = cb->args[2];
714
715         if (cb->args[0] == 0) {
716                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
717                         goto skip_listen_ht;
718
719                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
720                         struct sock *sk;
721                         struct hlist_nulls_node *node;
722                         struct inet_listen_hashbucket *ilb;
723
724                         num = 0;
725                         ilb = &hashinfo->listening_hash[i];
726                         spin_lock_bh(&ilb->lock);
727                         sk_nulls_for_each(sk, node, &ilb->head) {
728                                 struct inet_sock *inet = inet_sk(sk);
729
730                                 if (num < s_num) {
731                                         num++;
732                                         continue;
733                                 }
734
735                                 if (r->id.idiag_sport != inet->sport &&
736                                     r->id.idiag_sport)
737                                         goto next_listen;
738
739                                 if (!(r->idiag_states & TCPF_LISTEN) ||
740                                     r->id.idiag_dport ||
741                                     cb->args[3] > 0)
742                                         goto syn_recv;
743
744                                 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
745                                         spin_unlock_bh(&ilb->lock);
746                                         goto done;
747                                 }
748
749 syn_recv:
750                                 if (!(r->idiag_states & TCPF_SYN_RECV))
751                                         goto next_listen;
752
753                                 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
754                                         spin_unlock_bh(&ilb->lock);
755                                         goto done;
756                                 }
757
758 next_listen:
759                                 cb->args[3] = 0;
760                                 cb->args[4] = 0;
761                                 ++num;
762                         }
763                         spin_unlock_bh(&ilb->lock);
764
765                         s_num = 0;
766                         cb->args[3] = 0;
767                         cb->args[4] = 0;
768                 }
769 skip_listen_ht:
770                 cb->args[0] = 1;
771                 s_i = num = s_num = 0;
772         }
773
774         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
775                 goto unlock;
776
777         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
778                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
779                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
780                 struct sock *sk;
781                 struct hlist_nulls_node *node;
782
783                 num = 0;
784
785                 if (hlist_nulls_empty(&head->chain) &&
786                         hlist_nulls_empty(&head->twchain))
787                         continue;
788
789                 if (i > s_i)
790                         s_num = 0;
791
792                 spin_lock_bh(lock);
793                 sk_nulls_for_each(sk, node, &head->chain) {
794                         struct inet_sock *inet = inet_sk(sk);
795
796                         if (num < s_num)
797                                 goto next_normal;
798                         if (!(r->idiag_states & (1 << sk->sk_state)))
799                                 goto next_normal;
800                         if (r->id.idiag_sport != inet->sport &&
801                             r->id.idiag_sport)
802                                 goto next_normal;
803                         if (r->id.idiag_dport != inet->dport &&
804                             r->id.idiag_dport)
805                                 goto next_normal;
806                         if (inet_csk_diag_dump(sk, skb, cb) < 0) {
807                                 spin_unlock_bh(lock);
808                                 goto done;
809                         }
810 next_normal:
811                         ++num;
812                 }
813
814                 if (r->idiag_states & TCPF_TIME_WAIT) {
815                         struct inet_timewait_sock *tw;
816
817                         inet_twsk_for_each(tw, node,
818                                     &head->twchain) {
819
820                                 if (num < s_num)
821                                         goto next_dying;
822                                 if (r->id.idiag_sport != tw->tw_sport &&
823                                     r->id.idiag_sport)
824                                         goto next_dying;
825                                 if (r->id.idiag_dport != tw->tw_dport &&
826                                     r->id.idiag_dport)
827                                         goto next_dying;
828                                 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
829                                         spin_unlock_bh(lock);
830                                         goto done;
831                                 }
832 next_dying:
833                                 ++num;
834                         }
835                 }
836                 spin_unlock_bh(lock);
837         }
838
839 done:
840         cb->args[1] = i;
841         cb->args[2] = num;
842 unlock:
843         inet_diag_unlock_handler(handler);
844         return skb->len;
845 }
846
847 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
848 {
849         int hdrlen = sizeof(struct inet_diag_req);
850
851         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
852             nlmsg_len(nlh) < hdrlen)
853                 return -EINVAL;
854
855         if (nlh->nlmsg_flags & NLM_F_DUMP) {
856                 if (nlmsg_attrlen(nlh, hdrlen)) {
857                         struct nlattr *attr;
858
859                         attr = nlmsg_find_attr(nlh, hdrlen,
860                                                INET_DIAG_REQ_BYTECODE);
861                         if (attr == NULL ||
862                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
863                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
864                                 return -EINVAL;
865                 }
866
867                 return netlink_dump_start(idiagnl, skb, nlh,
868                                           inet_diag_dump, NULL);
869         }
870
871         return inet_diag_get_exact(skb, nlh);
872 }
873
874 static DEFINE_MUTEX(inet_diag_mutex);
875
876 static void inet_diag_rcv(struct sk_buff *skb)
877 {
878         mutex_lock(&inet_diag_mutex);
879         netlink_rcv_skb(skb, &inet_diag_rcv_msg);
880         mutex_unlock(&inet_diag_mutex);
881 }
882
883 int inet_diag_register(const struct inet_diag_handler *h)
884 {
885         const __u16 type = h->idiag_type;
886         int err = -EINVAL;
887
888         if (type >= INET_DIAG_GETSOCK_MAX)
889                 goto out;
890
891         mutex_lock(&inet_diag_table_mutex);
892         err = -EEXIST;
893         if (inet_diag_table[type] == NULL) {
894                 inet_diag_table[type] = h;
895                 err = 0;
896         }
897         mutex_unlock(&inet_diag_table_mutex);
898 out:
899         return err;
900 }
901 EXPORT_SYMBOL_GPL(inet_diag_register);
902
903 void inet_diag_unregister(const struct inet_diag_handler *h)
904 {
905         const __u16 type = h->idiag_type;
906
907         if (type >= INET_DIAG_GETSOCK_MAX)
908                 return;
909
910         mutex_lock(&inet_diag_table_mutex);
911         inet_diag_table[type] = NULL;
912         mutex_unlock(&inet_diag_table_mutex);
913 }
914 EXPORT_SYMBOL_GPL(inet_diag_unregister);
915
916 static int __init inet_diag_init(void)
917 {
918         const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
919                                           sizeof(struct inet_diag_handler *));
920         int err = -ENOMEM;
921
922         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
923         if (!inet_diag_table)
924                 goto out;
925
926         idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
927                                         inet_diag_rcv, NULL, THIS_MODULE);
928         if (idiagnl == NULL)
929                 goto out_free_table;
930         err = 0;
931 out:
932         return err;
933 out_free_table:
934         kfree(inet_diag_table);
935         goto out;
936 }
937
938 static void __exit inet_diag_exit(void)
939 {
940         netlink_kernel_release(idiagnl);
941         kfree(inet_diag_table);
942 }
943
944 module_init(inet_diag_init);
945 module_exit(inet_diag_exit);
946 MODULE_LICENSE("GPL");
947 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);