f66945cb158fd346c0b2f87d0dec068620b7a838
[linux-2.6.git] / net / ipv4 / tcp_diag.c
1 /*
2  * tcp_diag.c   Module for monitoring TCP sockets.
3  *
4  * Version:     $Id: tcp_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/config.h>
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <linux/fcntl.h>
18 #include <linux/random.h>
19 #include <linux/cache.h>
20 #include <linux/init.h>
21 #include <linux/time.h>
22
23 #include <net/icmp.h>
24 #include <net/tcp.h>
25 #include <net/ipv6.h>
26 #include <net/inet_common.h>
27
28 #include <linux/inet.h>
29 #include <linux/stddef.h>
30
31 #include <linux/tcp_diag.h>
32
33 struct tcpdiag_entry
34 {
35         u32 *saddr;
36         u32 *daddr;
37         u16 sport;
38         u16 dport;
39         u16 family;
40         u16 userlocks;
41 };
42
43 static struct sock *tcpnl;
44
45 #define TCPDIAG_PUT(skb, attrtype, attrlen) \
46         RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
47
48 static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk,
49                         int ext, u32 pid, u32 seq, u16 nlmsg_flags)
50 {
51         struct inet_sock *inet = inet_sk(sk);
52         struct tcp_sock *tp = tcp_sk(sk);
53         struct tcpdiagmsg *r;
54         struct nlmsghdr  *nlh;
55         struct tcp_info  *info = NULL;
56         struct tcpdiag_meminfo  *minfo = NULL;
57         unsigned char    *b = skb->tail;
58
59         nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r));
60         nlh->nlmsg_flags = nlmsg_flags;
61         r = NLMSG_DATA(nlh);
62         if (sk->sk_state != TCP_TIME_WAIT) {
63                 if (ext & (1<<(TCPDIAG_MEMINFO-1)))
64                         minfo = TCPDIAG_PUT(skb, TCPDIAG_MEMINFO, sizeof(*minfo));
65                 if (ext & (1<<(TCPDIAG_INFO-1)))
66                         info = TCPDIAG_PUT(skb, TCPDIAG_INFO, sizeof(*info));
67                 
68                 if (ext & (1<<(TCPDIAG_CONG-1))) {
69                         size_t len = strlen(tp->ca_ops->name);
70                         strcpy(TCPDIAG_PUT(skb, TCPDIAG_CONG, len+1),
71                                tp->ca_ops->name);
72                 }
73         }
74         r->tcpdiag_family = sk->sk_family;
75         r->tcpdiag_state = sk->sk_state;
76         r->tcpdiag_timer = 0;
77         r->tcpdiag_retrans = 0;
78
79         r->id.tcpdiag_if = sk->sk_bound_dev_if;
80         r->id.tcpdiag_cookie[0] = (u32)(unsigned long)sk;
81         r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
82
83         if (r->tcpdiag_state == TCP_TIME_WAIT) {
84                 struct tcp_tw_bucket *tw = (struct tcp_tw_bucket*)sk;
85                 long tmo = tw->tw_ttd - jiffies;
86                 if (tmo < 0)
87                         tmo = 0;
88
89                 r->id.tcpdiag_sport = tw->tw_sport;
90                 r->id.tcpdiag_dport = tw->tw_dport;
91                 r->id.tcpdiag_src[0] = tw->tw_rcv_saddr;
92                 r->id.tcpdiag_dst[0] = tw->tw_daddr;
93                 r->tcpdiag_state = tw->tw_substate;
94                 r->tcpdiag_timer = 3;
95                 r->tcpdiag_expires = (tmo*1000+HZ-1)/HZ;
96                 r->tcpdiag_rqueue = 0;
97                 r->tcpdiag_wqueue = 0;
98                 r->tcpdiag_uid = 0;
99                 r->tcpdiag_inode = 0;
100 #ifdef CONFIG_IP_TCPDIAG_IPV6
101                 if (r->tcpdiag_family == AF_INET6) {
102                         ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
103                                        &tw->tw_v6_rcv_saddr);
104                         ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
105                                        &tw->tw_v6_daddr);
106                 }
107 #endif
108                 nlh->nlmsg_len = skb->tail - b;
109                 return skb->len;
110         }
111
112         r->id.tcpdiag_sport = inet->sport;
113         r->id.tcpdiag_dport = inet->dport;
114         r->id.tcpdiag_src[0] = inet->rcv_saddr;
115         r->id.tcpdiag_dst[0] = inet->daddr;
116
117 #ifdef CONFIG_IP_TCPDIAG_IPV6
118         if (r->tcpdiag_family == AF_INET6) {
119                 struct ipv6_pinfo *np = inet6_sk(sk);
120
121                 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
122                                &np->rcv_saddr);
123                 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
124                                &np->daddr);
125         }
126 #endif
127
128 #define EXPIRES_IN_MS(tmo)  ((tmo-jiffies)*1000+HZ-1)/HZ
129
130         if (tp->pending == TCP_TIME_RETRANS) {
131                 r->tcpdiag_timer = 1;
132                 r->tcpdiag_retrans = tp->retransmits;
133                 r->tcpdiag_expires = EXPIRES_IN_MS(tp->timeout);
134         } else if (tp->pending == TCP_TIME_PROBE0) {
135                 r->tcpdiag_timer = 4;
136                 r->tcpdiag_retrans = tp->probes_out;
137                 r->tcpdiag_expires = EXPIRES_IN_MS(tp->timeout);
138         } else if (timer_pending(&sk->sk_timer)) {
139                 r->tcpdiag_timer = 2;
140                 r->tcpdiag_retrans = tp->probes_out;
141                 r->tcpdiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
142         } else {
143                 r->tcpdiag_timer = 0;
144                 r->tcpdiag_expires = 0;
145         }
146 #undef EXPIRES_IN_MS
147
148         r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq;
149         r->tcpdiag_wqueue = tp->write_seq - tp->snd_una;
150         r->tcpdiag_uid = sock_i_uid(sk);
151         r->tcpdiag_inode = sock_i_ino(sk);
152
153         if (minfo) {
154                 minfo->tcpdiag_rmem = atomic_read(&sk->sk_rmem_alloc);
155                 minfo->tcpdiag_wmem = sk->sk_wmem_queued;
156                 minfo->tcpdiag_fmem = sk->sk_forward_alloc;
157                 minfo->tcpdiag_tmem = atomic_read(&sk->sk_wmem_alloc);
158         }
159
160         if (info) 
161                 tcp_get_info(sk, info);
162
163         if (sk->sk_state < TCP_TIME_WAIT && tp->ca_ops->get_info)
164                 tp->ca_ops->get_info(tp, ext, skb);
165
166         nlh->nlmsg_len = skb->tail - b;
167         return skb->len;
168
169 rtattr_failure:
170 nlmsg_failure:
171         skb_trim(skb, b - skb->data);
172         return -1;
173 }
174
175 extern struct sock *tcp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 dport,
176                                   int dif);
177 #ifdef CONFIG_IP_TCPDIAG_IPV6
178 extern struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
179                                   struct in6_addr *daddr, u16 dport,
180                                   int dif);
181 #else
182 static inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
183                                          struct in6_addr *daddr, u16 dport,
184                                          int dif)
185 {
186         return NULL;
187 }
188 #endif
189
190 static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh)
191 {
192         int err;
193         struct sock *sk;
194         struct tcpdiagreq *req = NLMSG_DATA(nlh);
195         struct sk_buff *rep;
196
197         if (req->tcpdiag_family == AF_INET) {
198                 sk = tcp_v4_lookup(req->id.tcpdiag_dst[0], req->id.tcpdiag_dport,
199                                    req->id.tcpdiag_src[0], req->id.tcpdiag_sport,
200                                    req->id.tcpdiag_if);
201         }
202 #ifdef CONFIG_IP_TCPDIAG_IPV6
203         else if (req->tcpdiag_family == AF_INET6) {
204                 sk = tcp_v6_lookup((struct in6_addr*)req->id.tcpdiag_dst, req->id.tcpdiag_dport,
205                                    (struct in6_addr*)req->id.tcpdiag_src, req->id.tcpdiag_sport,
206                                    req->id.tcpdiag_if);
207         }
208 #endif
209         else {
210                 return -EINVAL;
211         }
212
213         if (sk == NULL)
214                 return -ENOENT;
215
216         err = -ESTALE;
217         if ((req->id.tcpdiag_cookie[0] != TCPDIAG_NOCOOKIE ||
218              req->id.tcpdiag_cookie[1] != TCPDIAG_NOCOOKIE) &&
219             ((u32)(unsigned long)sk != req->id.tcpdiag_cookie[0] ||
220              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.tcpdiag_cookie[1]))
221                 goto out;
222
223         err = -ENOMEM;
224         rep = alloc_skb(NLMSG_SPACE(sizeof(struct tcpdiagmsg)+
225                                     sizeof(struct tcpdiag_meminfo)+
226                                     sizeof(struct tcp_info)+64), GFP_KERNEL);
227         if (!rep)
228                 goto out;
229
230         if (tcpdiag_fill(rep, sk, req->tcpdiag_ext,
231                          NETLINK_CB(in_skb).pid,
232                          nlh->nlmsg_seq, 0) <= 0)
233                 BUG();
234
235         err = netlink_unicast(tcpnl, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
236         if (err > 0)
237                 err = 0;
238
239 out:
240         if (sk) {
241                 if (sk->sk_state == TCP_TIME_WAIT)
242                         tcp_tw_put((struct tcp_tw_bucket*)sk);
243                 else
244                         sock_put(sk);
245         }
246         return err;
247 }
248
249 static int bitstring_match(const u32 *a1, const u32 *a2, int bits)
250 {
251         int words = bits >> 5;
252
253         bits &= 0x1f;
254
255         if (words) {
256                 if (memcmp(a1, a2, words << 2))
257                         return 0;
258         }
259         if (bits) {
260                 __u32 w1, w2;
261                 __u32 mask;
262
263                 w1 = a1[words];
264                 w2 = a2[words];
265
266                 mask = htonl((0xffffffff) << (32 - bits));
267
268                 if ((w1 ^ w2) & mask)
269                         return 0;
270         }
271
272         return 1;
273 }
274
275
276 static int tcpdiag_bc_run(const void *bc, int len,
277                           const struct tcpdiag_entry *entry)
278 {
279         while (len > 0) {
280                 int yes = 1;
281                 const struct tcpdiag_bc_op *op = bc;
282
283                 switch (op->code) {
284                 case TCPDIAG_BC_NOP:
285                         break;
286                 case TCPDIAG_BC_JMP:
287                         yes = 0;
288                         break;
289                 case TCPDIAG_BC_S_GE:
290                         yes = entry->sport >= op[1].no;
291                         break;
292                 case TCPDIAG_BC_S_LE:
293                         yes = entry->dport <= op[1].no;
294                         break;
295                 case TCPDIAG_BC_D_GE:
296                         yes = entry->dport >= op[1].no;
297                         break;
298                 case TCPDIAG_BC_D_LE:
299                         yes = entry->dport <= op[1].no;
300                         break;
301                 case TCPDIAG_BC_AUTO:
302                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
303                         break;
304                 case TCPDIAG_BC_S_COND:
305                 case TCPDIAG_BC_D_COND:
306                 {
307                         struct tcpdiag_hostcond *cond = (struct tcpdiag_hostcond*)(op+1);
308                         u32 *addr;
309
310                         if (cond->port != -1 &&
311                             cond->port != (op->code == TCPDIAG_BC_S_COND ?
312                                              entry->sport : entry->dport)) {
313                                 yes = 0;
314                                 break;
315                         }
316                         
317                         if (cond->prefix_len == 0)
318                                 break;
319
320                         if (op->code == TCPDIAG_BC_S_COND)
321                                 addr = entry->saddr;
322                         else
323                                 addr = entry->daddr;
324
325                         if (bitstring_match(addr, cond->addr, cond->prefix_len))
326                                 break;
327                         if (entry->family == AF_INET6 &&
328                             cond->family == AF_INET) {
329                                 if (addr[0] == 0 && addr[1] == 0 &&
330                                     addr[2] == htonl(0xffff) &&
331                                     bitstring_match(addr+3, cond->addr, cond->prefix_len))
332                                         break;
333                         }
334                         yes = 0;
335                         break;
336                 }
337                 }
338
339                 if (yes) { 
340                         len -= op->yes;
341                         bc += op->yes;
342                 } else {
343                         len -= op->no;
344                         bc += op->no;
345                 }
346         }
347         return (len == 0);
348 }
349
350 static int valid_cc(const void *bc, int len, int cc)
351 {
352         while (len >= 0) {
353                 const struct tcpdiag_bc_op *op = bc;
354
355                 if (cc > len)
356                         return 0;
357                 if (cc == len)
358                         return 1;
359                 if (op->yes < 4)
360                         return 0;
361                 len -= op->yes;
362                 bc  += op->yes;
363         }
364         return 0;
365 }
366
367 static int tcpdiag_bc_audit(const void *bytecode, int bytecode_len)
368 {
369         const unsigned char *bc = bytecode;
370         int  len = bytecode_len;
371
372         while (len > 0) {
373                 struct tcpdiag_bc_op *op = (struct tcpdiag_bc_op*)bc;
374
375 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
376                 switch (op->code) {
377                 case TCPDIAG_BC_AUTO:
378                 case TCPDIAG_BC_S_COND:
379                 case TCPDIAG_BC_D_COND:
380                 case TCPDIAG_BC_S_GE:
381                 case TCPDIAG_BC_S_LE:
382                 case TCPDIAG_BC_D_GE:
383                 case TCPDIAG_BC_D_LE:
384                         if (op->yes < 4 || op->yes > len+4)
385                                 return -EINVAL;
386                 case TCPDIAG_BC_JMP:
387                         if (op->no < 4 || op->no > len+4)
388                                 return -EINVAL;
389                         if (op->no < len &&
390                             !valid_cc(bytecode, bytecode_len, len-op->no))
391                                 return -EINVAL;
392                         break;
393                 case TCPDIAG_BC_NOP:
394                         if (op->yes < 4 || op->yes > len+4)
395                                 return -EINVAL;
396                         break;
397                 default:
398                         return -EINVAL;
399                 }
400                 bc += op->yes;
401                 len -= op->yes;
402         }
403         return len == 0 ? 0 : -EINVAL;
404 }
405
406 static int tcpdiag_dump_sock(struct sk_buff *skb, struct sock *sk,
407                              struct netlink_callback *cb)
408 {
409         struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
410
411         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
412                 struct tcpdiag_entry entry;
413                 struct rtattr *bc = (struct rtattr *)(r + 1);
414                 struct inet_sock *inet = inet_sk(sk);
415
416                 entry.family = sk->sk_family;
417 #ifdef CONFIG_IP_TCPDIAG_IPV6
418                 if (entry.family == AF_INET6) {
419                         struct ipv6_pinfo *np = inet6_sk(sk);
420
421                         entry.saddr = np->rcv_saddr.s6_addr32;
422                         entry.daddr = np->daddr.s6_addr32;
423                 } else
424 #endif
425                 {
426                         entry.saddr = &inet->rcv_saddr;
427                         entry.daddr = &inet->daddr;
428                 }
429                 entry.sport = inet->num;
430                 entry.dport = ntohs(inet->dport);
431                 entry.userlocks = sk->sk_userlocks;
432
433                 if (!tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
434                         return 0;
435         }
436
437         return tcpdiag_fill(skb, sk, r->tcpdiag_ext, NETLINK_CB(cb->skb).pid,
438                             cb->nlh->nlmsg_seq, NLM_F_MULTI);
439 }
440
441 static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk,
442                             struct request_sock *req,
443                             u32 pid, u32 seq)
444 {
445         const struct inet_request_sock *ireq = inet_rsk(req);
446         struct inet_sock *inet = inet_sk(sk);
447         unsigned char *b = skb->tail;
448         struct tcpdiagmsg *r;
449         struct nlmsghdr *nlh;
450         long tmo;
451
452         nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r));
453         nlh->nlmsg_flags = NLM_F_MULTI;
454         r = NLMSG_DATA(nlh);
455
456         r->tcpdiag_family = sk->sk_family;
457         r->tcpdiag_state = TCP_SYN_RECV;
458         r->tcpdiag_timer = 1;
459         r->tcpdiag_retrans = req->retrans;
460
461         r->id.tcpdiag_if = sk->sk_bound_dev_if;
462         r->id.tcpdiag_cookie[0] = (u32)(unsigned long)req;
463         r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
464
465         tmo = req->expires - jiffies;
466         if (tmo < 0)
467                 tmo = 0;
468
469         r->id.tcpdiag_sport = inet->sport;
470         r->id.tcpdiag_dport = ireq->rmt_port;
471         r->id.tcpdiag_src[0] = ireq->loc_addr;
472         r->id.tcpdiag_dst[0] = ireq->rmt_addr;
473         r->tcpdiag_expires = jiffies_to_msecs(tmo),
474         r->tcpdiag_rqueue = 0;
475         r->tcpdiag_wqueue = 0;
476         r->tcpdiag_uid = sock_i_uid(sk);
477         r->tcpdiag_inode = 0;
478 #ifdef CONFIG_IP_TCPDIAG_IPV6
479         if (r->tcpdiag_family == AF_INET6) {
480                 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
481                                &tcp6_rsk(req)->loc_addr);
482                 ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
483                                &tcp6_rsk(req)->rmt_addr);
484         }
485 #endif
486         nlh->nlmsg_len = skb->tail - b;
487
488         return skb->len;
489
490 nlmsg_failure:
491         skb_trim(skb, b - skb->data);
492         return -1;
493 }
494
495 static int tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk,
496                              struct netlink_callback *cb)
497 {
498         struct tcpdiag_entry entry;
499         struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
500         struct tcp_sock *tp = tcp_sk(sk);
501         struct listen_sock *lopt;
502         struct rtattr *bc = NULL;
503         struct inet_sock *inet = inet_sk(sk);
504         int j, s_j;
505         int reqnum, s_reqnum;
506         int err = 0;
507
508         s_j = cb->args[3];
509         s_reqnum = cb->args[4];
510
511         if (s_j > 0)
512                 s_j--;
513
514         entry.family = sk->sk_family;
515
516         read_lock_bh(&tp->accept_queue.syn_wait_lock);
517
518         lopt = tp->accept_queue.listen_opt;
519         if (!lopt || !lopt->qlen)
520                 goto out;
521
522         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
523                 bc = (struct rtattr *)(r + 1);
524                 entry.sport = inet->num;
525                 entry.userlocks = sk->sk_userlocks;
526         }
527
528         for (j = s_j; j < TCP_SYNQ_HSIZE; j++) {
529                 struct request_sock *req, *head = lopt->syn_table[j];
530
531                 reqnum = 0;
532                 for (req = head; req; reqnum++, req = req->dl_next) {
533                         struct inet_request_sock *ireq = inet_rsk(req);
534
535                         if (reqnum < s_reqnum)
536                                 continue;
537                         if (r->id.tcpdiag_dport != ireq->rmt_port &&
538                             r->id.tcpdiag_dport)
539                                 continue;
540
541                         if (bc) {
542                                 entry.saddr =
543 #ifdef CONFIG_IP_TCPDIAG_IPV6
544                                         (entry.family == AF_INET6) ?
545                                         tcp6_rsk(req)->loc_addr.s6_addr32 :
546 #endif
547                                         &ireq->loc_addr;
548                                 entry.daddr = 
549 #ifdef CONFIG_IP_TCPDIAG_IPV6
550                                         (entry.family == AF_INET6) ?
551                                         tcp6_rsk(req)->rmt_addr.s6_addr32 :
552 #endif
553                                         &ireq->rmt_addr;
554                                 entry.dport = ntohs(ireq->rmt_port);
555
556                                 if (!tcpdiag_bc_run(RTA_DATA(bc),
557                                                     RTA_PAYLOAD(bc), &entry))
558                                         continue;
559                         }
560
561                         err = tcpdiag_fill_req(skb, sk, req,
562                                                NETLINK_CB(cb->skb).pid,
563                                                cb->nlh->nlmsg_seq);
564                         if (err < 0) {
565                                 cb->args[3] = j + 1;
566                                 cb->args[4] = reqnum;
567                                 goto out;
568                         }
569                 }
570
571                 s_reqnum = 0;
572         }
573
574 out:
575         read_unlock_bh(&tp->accept_queue.syn_wait_lock);
576
577         return err;
578 }
579
580 static int tcpdiag_dump(struct sk_buff *skb, struct netlink_callback *cb)
581 {
582         int i, num;
583         int s_i, s_num;
584         struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
585
586         s_i = cb->args[1];
587         s_num = num = cb->args[2];
588
589         if (cb->args[0] == 0) {
590                 if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV)))
591                         goto skip_listen_ht;
592                 tcp_listen_lock();
593                 for (i = s_i; i < TCP_LHTABLE_SIZE; i++) {
594                         struct sock *sk;
595                         struct hlist_node *node;
596
597                         num = 0;
598                         sk_for_each(sk, node, &tcp_listening_hash[i]) {
599                                 struct inet_sock *inet = inet_sk(sk);
600
601                                 if (num < s_num) {
602                                         num++;
603                                         continue;
604                                 }
605
606                                 if (r->id.tcpdiag_sport != inet->sport &&
607                                     r->id.tcpdiag_sport)
608                                         goto next_listen;
609
610                                 if (!(r->tcpdiag_states&TCPF_LISTEN) ||
611                                     r->id.tcpdiag_dport ||
612                                     cb->args[3] > 0)
613                                         goto syn_recv;
614
615                                 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
616                                         tcp_listen_unlock();
617                                         goto done;
618                                 }
619
620 syn_recv:
621                                 if (!(r->tcpdiag_states&TCPF_SYN_RECV))
622                                         goto next_listen;
623
624                                 if (tcpdiag_dump_reqs(skb, sk, cb) < 0) {
625                                         tcp_listen_unlock();
626                                         goto done;
627                                 }
628
629 next_listen:
630                                 cb->args[3] = 0;
631                                 cb->args[4] = 0;
632                                 ++num;
633                         }
634
635                         s_num = 0;
636                         cb->args[3] = 0;
637                         cb->args[4] = 0;
638                 }
639                 tcp_listen_unlock();
640 skip_listen_ht:
641                 cb->args[0] = 1;
642                 s_i = num = s_num = 0;
643         }
644
645         if (!(r->tcpdiag_states&~(TCPF_LISTEN|TCPF_SYN_RECV)))
646                 return skb->len;
647
648         for (i = s_i; i < tcp_ehash_size; i++) {
649                 struct tcp_ehash_bucket *head = &tcp_ehash[i];
650                 struct sock *sk;
651                 struct hlist_node *node;
652
653                 if (i > s_i)
654                         s_num = 0;
655
656                 read_lock_bh(&head->lock);
657
658                 num = 0;
659                 sk_for_each(sk, node, &head->chain) {
660                         struct inet_sock *inet = inet_sk(sk);
661
662                         if (num < s_num)
663                                 goto next_normal;
664                         if (!(r->tcpdiag_states & (1 << sk->sk_state)))
665                                 goto next_normal;
666                         if (r->id.tcpdiag_sport != inet->sport &&
667                             r->id.tcpdiag_sport)
668                                 goto next_normal;
669                         if (r->id.tcpdiag_dport != inet->dport && r->id.tcpdiag_dport)
670                                 goto next_normal;
671                         if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
672                                 read_unlock_bh(&head->lock);
673                                 goto done;
674                         }
675 next_normal:
676                         ++num;
677                 }
678
679                 if (r->tcpdiag_states&TCPF_TIME_WAIT) {
680                         sk_for_each(sk, node,
681                                     &tcp_ehash[i + tcp_ehash_size].chain) {
682                                 struct inet_sock *inet = inet_sk(sk);
683
684                                 if (num < s_num)
685                                         goto next_dying;
686                                 if (r->id.tcpdiag_sport != inet->sport &&
687                                     r->id.tcpdiag_sport)
688                                         goto next_dying;
689                                 if (r->id.tcpdiag_dport != inet->dport &&
690                                     r->id.tcpdiag_dport)
691                                         goto next_dying;
692                                 if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
693                                         read_unlock_bh(&head->lock);
694                                         goto done;
695                                 }
696 next_dying:
697                                 ++num;
698                         }
699                 }
700                 read_unlock_bh(&head->lock);
701         }
702
703 done:
704         cb->args[1] = i;
705         cb->args[2] = num;
706         return skb->len;
707 }
708
709 static int tcpdiag_dump_done(struct netlink_callback *cb)
710 {
711         return 0;
712 }
713
714
715 static __inline__ int
716 tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
717 {
718         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
719                 return 0;
720
721         if (nlh->nlmsg_type != TCPDIAG_GETSOCK)
722                 goto err_inval;
723
724         if (NLMSG_LENGTH(sizeof(struct tcpdiagreq)) > skb->len)
725                 goto err_inval;
726
727         if (nlh->nlmsg_flags&NLM_F_DUMP) {
728                 if (nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(struct tcpdiagreq))) {
729                         struct rtattr *rta = (struct rtattr*)(NLMSG_DATA(nlh) + sizeof(struct tcpdiagreq));
730                         if (rta->rta_type != TCPDIAG_REQ_BYTECODE ||
731                             rta->rta_len < 8 ||
732                             rta->rta_len > nlh->nlmsg_len - NLMSG_SPACE(sizeof(struct tcpdiagreq)))
733                                 goto err_inval;
734                         if (tcpdiag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
735                                 goto err_inval;
736                 }
737                 return netlink_dump_start(tcpnl, skb, nlh,
738                                           tcpdiag_dump,
739                                           tcpdiag_dump_done);
740         } else {
741                 return tcpdiag_get_exact(skb, nlh);
742         }
743
744 err_inval:
745         return -EINVAL;
746 }
747
748
749 static inline void tcpdiag_rcv_skb(struct sk_buff *skb)
750 {
751         int err;
752         struct nlmsghdr * nlh;
753
754         if (skb->len >= NLMSG_SPACE(0)) {
755                 nlh = (struct nlmsghdr *)skb->data;
756                 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
757                         return;
758                 err = tcpdiag_rcv_msg(skb, nlh);
759                 if (err || nlh->nlmsg_flags & NLM_F_ACK) 
760                         netlink_ack(skb, nlh, err);
761         }
762 }
763
764 static void tcpdiag_rcv(struct sock *sk, int len)
765 {
766         struct sk_buff *skb;
767         unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
768
769         while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
770                 tcpdiag_rcv_skb(skb);
771                 kfree_skb(skb);
772         }
773 }
774
775 static int __init tcpdiag_init(void)
776 {
777         tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv);
778         if (tcpnl == NULL)
779                 return -ENOMEM;
780         return 0;
781 }
782
783 static void __exit tcpdiag_exit(void)
784 {
785         sock_release(tcpnl->sk_socket);
786 }
787
788 module_init(tcpdiag_init);
789 module_exit(tcpdiag_exit);
790 MODULE_LICENSE("GPL");