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