fbe7714f21d08593beecb3945f2f85848b506be8
[linux-2.6.git] / net / ipv4 / inet_connection_sock.c
1 /*
2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
3  *              operating system.  INET is implemented using the  BSD Socket
4  *              interface as the means of communication with the user level.
5  *
6  *              Support for INET connection oriented protocols.
7  *
8  * Authors:     See the TCP sources
9  *
10  *              This program is free software; you can redistribute it and/or
11  *              modify it under the terms of the GNU General Public License
12  *              as published by the Free Software Foundation; either version
13  *              2 of the License, or(at your option) any later version.
14  */
15
16 #include <linux/module.h>
17 #include <linux/jhash.h>
18
19 #include <net/inet_connection_sock.h>
20 #include <net/inet_hashtables.h>
21 #include <net/inet_timewait_sock.h>
22 #include <net/ip.h>
23 #include <net/route.h>
24 #include <net/tcp_states.h>
25 #include <net/xfrm.h>
26
27 #ifdef INET_CSK_DEBUG
28 const char inet_csk_timer_bug_msg[] = "inet_csk BUG: unknown timer value\n";
29 EXPORT_SYMBOL(inet_csk_timer_bug_msg);
30 #endif
31
32 /*
33  * This array holds the first and last local port number.
34  */
35 int sysctl_local_port_range[2] = { 32768, 61000 };
36
37 int inet_csk_bind_conflict(const struct sock *sk,
38                            const struct inet_bind_bucket *tb)
39 {
40         const __be32 sk_rcv_saddr = inet_rcv_saddr(sk);
41         struct sock *sk2;
42         struct hlist_node *node;
43         int reuse = sk->sk_reuse;
44
45         sk_for_each_bound(sk2, node, &tb->owners) {
46                 if (sk != sk2 &&
47                     !inet_v6_ipv6only(sk2) &&
48                     (!sk->sk_bound_dev_if ||
49                      !sk2->sk_bound_dev_if ||
50                      sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
51                         if (!reuse || !sk2->sk_reuse ||
52                             sk2->sk_state == TCP_LISTEN) {
53                                 const __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
54                                 if (!sk2_rcv_saddr || !sk_rcv_saddr ||
55                                     sk2_rcv_saddr == sk_rcv_saddr)
56                                         break;
57                         }
58                 }
59         }
60         return node != NULL;
61 }
62
63 EXPORT_SYMBOL_GPL(inet_csk_bind_conflict);
64
65 /* Obtain a reference to a local port for the given sock,
66  * if snum is zero it means select any available local port.
67  */
68 int inet_csk_get_port(struct inet_hashinfo *hashinfo,
69                       struct sock *sk, unsigned short snum,
70                       int (*bind_conflict)(const struct sock *sk,
71                                            const struct inet_bind_bucket *tb))
72 {
73         struct inet_bind_hashbucket *head;
74         struct hlist_node *node;
75         struct inet_bind_bucket *tb;
76         int ret;
77
78         local_bh_disable();
79         if (!snum) {
80                 int low = sysctl_local_port_range[0];
81                 int high = sysctl_local_port_range[1];
82                 int remaining = (high - low) + 1;
83                 int rover = net_random() % (high - low) + low;
84
85                 do {
86                         head = &hashinfo->bhash[inet_bhashfn(rover, hashinfo->bhash_size)];
87                         spin_lock(&head->lock);
88                         inet_bind_bucket_for_each(tb, node, &head->chain)
89                                 if (tb->port == rover)
90                                         goto next;
91                         break;
92                 next:
93                         spin_unlock(&head->lock);
94                         if (++rover > high)
95                                 rover = low;
96                 } while (--remaining > 0);
97
98                 /* Exhausted local port range during search?  It is not
99                  * possible for us to be holding one of the bind hash
100                  * locks if this test triggers, because if 'remaining'
101                  * drops to zero, we broke out of the do/while loop at
102                  * the top level, not from the 'break;' statement.
103                  */
104                 ret = 1;
105                 if (remaining <= 0)
106                         goto fail;
107
108                 /* OK, here is the one we will use.  HEAD is
109                  * non-NULL and we hold it's mutex.
110                  */
111                 snum = rover;
112         } else {
113                 head = &hashinfo->bhash[inet_bhashfn(snum, hashinfo->bhash_size)];
114                 spin_lock(&head->lock);
115                 inet_bind_bucket_for_each(tb, node, &head->chain)
116                         if (tb->port == snum)
117                                 goto tb_found;
118         }
119         tb = NULL;
120         goto tb_not_found;
121 tb_found:
122         if (!hlist_empty(&tb->owners)) {
123                 if (sk->sk_reuse > 1)
124                         goto success;
125                 if (tb->fastreuse > 0 &&
126                     sk->sk_reuse && sk->sk_state != TCP_LISTEN) {
127                         goto success;
128                 } else {
129                         ret = 1;
130                         if (bind_conflict(sk, tb))
131                                 goto fail_unlock;
132                 }
133         }
134 tb_not_found:
135         ret = 1;
136         if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep, head, snum)) == NULL)
137                 goto fail_unlock;
138         if (hlist_empty(&tb->owners)) {
139                 if (sk->sk_reuse && sk->sk_state != TCP_LISTEN)
140                         tb->fastreuse = 1;
141                 else
142                         tb->fastreuse = 0;
143         } else if (tb->fastreuse &&
144                    (!sk->sk_reuse || sk->sk_state == TCP_LISTEN))
145                 tb->fastreuse = 0;
146 success:
147         if (!inet_csk(sk)->icsk_bind_hash)
148                 inet_bind_hash(sk, tb, snum);
149         BUG_TRAP(inet_csk(sk)->icsk_bind_hash == tb);
150         ret = 0;
151
152 fail_unlock:
153         spin_unlock(&head->lock);
154 fail:
155         local_bh_enable();
156         return ret;
157 }
158
159 EXPORT_SYMBOL_GPL(inet_csk_get_port);
160
161 /*
162  * Wait for an incoming connection, avoid race conditions. This must be called
163  * with the socket locked.
164  */
165 static int inet_csk_wait_for_connect(struct sock *sk, long timeo)
166 {
167         struct inet_connection_sock *icsk = inet_csk(sk);
168         DEFINE_WAIT(wait);
169         int err;
170
171         /*
172          * True wake-one mechanism for incoming connections: only
173          * one process gets woken up, not the 'whole herd'.
174          * Since we do not 'race & poll' for established sockets
175          * anymore, the common case will execute the loop only once.
176          *
177          * Subtle issue: "add_wait_queue_exclusive()" will be added
178          * after any current non-exclusive waiters, and we know that
179          * it will always _stay_ after any new non-exclusive waiters
180          * because all non-exclusive waiters are added at the
181          * beginning of the wait-queue. As such, it's ok to "drop"
182          * our exclusiveness temporarily when we get woken up without
183          * having to remove and re-insert us on the wait queue.
184          */
185         for (;;) {
186                 prepare_to_wait_exclusive(sk->sk_sleep, &wait,
187                                           TASK_INTERRUPTIBLE);
188                 release_sock(sk);
189                 if (reqsk_queue_empty(&icsk->icsk_accept_queue))
190                         timeo = schedule_timeout(timeo);
191                 lock_sock(sk);
192                 err = 0;
193                 if (!reqsk_queue_empty(&icsk->icsk_accept_queue))
194                         break;
195                 err = -EINVAL;
196                 if (sk->sk_state != TCP_LISTEN)
197                         break;
198                 err = sock_intr_errno(timeo);
199                 if (signal_pending(current))
200                         break;
201                 err = -EAGAIN;
202                 if (!timeo)
203                         break;
204         }
205         finish_wait(sk->sk_sleep, &wait);
206         return err;
207 }
208
209 /*
210  * This will accept the next outstanding connection.
211  */
212 struct sock *inet_csk_accept(struct sock *sk, int flags, int *err)
213 {
214         struct inet_connection_sock *icsk = inet_csk(sk);
215         struct sock *newsk;
216         int error;
217
218         lock_sock(sk);
219
220         /* We need to make sure that this socket is listening,
221          * and that it has something pending.
222          */
223         error = -EINVAL;
224         if (sk->sk_state != TCP_LISTEN)
225                 goto out_err;
226
227         /* Find already established connection */
228         if (reqsk_queue_empty(&icsk->icsk_accept_queue)) {
229                 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
230
231                 /* If this is a non blocking socket don't sleep */
232                 error = -EAGAIN;
233                 if (!timeo)
234                         goto out_err;
235
236                 error = inet_csk_wait_for_connect(sk, timeo);
237                 if (error)
238                         goto out_err;
239         }
240
241         newsk = reqsk_queue_get_child(&icsk->icsk_accept_queue, sk);
242         BUG_TRAP(newsk->sk_state != TCP_SYN_RECV);
243 out:
244         release_sock(sk);
245         return newsk;
246 out_err:
247         newsk = NULL;
248         *err = error;
249         goto out;
250 }
251
252 EXPORT_SYMBOL(inet_csk_accept);
253
254 /*
255  * Using different timers for retransmit, delayed acks and probes
256  * We may wish use just one timer maintaining a list of expire jiffies
257  * to optimize.
258  */
259 void inet_csk_init_xmit_timers(struct sock *sk,
260                                void (*retransmit_handler)(unsigned long),
261                                void (*delack_handler)(unsigned long),
262                                void (*keepalive_handler)(unsigned long))
263 {
264         struct inet_connection_sock *icsk = inet_csk(sk);
265
266         init_timer(&icsk->icsk_retransmit_timer);
267         init_timer(&icsk->icsk_delack_timer);
268         init_timer(&sk->sk_timer);
269
270         icsk->icsk_retransmit_timer.function = retransmit_handler;
271         icsk->icsk_delack_timer.function     = delack_handler;
272         sk->sk_timer.function                = keepalive_handler;
273
274         icsk->icsk_retransmit_timer.data =
275                 icsk->icsk_delack_timer.data =
276                         sk->sk_timer.data  = (unsigned long)sk;
277
278         icsk->icsk_pending = icsk->icsk_ack.pending = 0;
279 }
280
281 EXPORT_SYMBOL(inet_csk_init_xmit_timers);
282
283 void inet_csk_clear_xmit_timers(struct sock *sk)
284 {
285         struct inet_connection_sock *icsk = inet_csk(sk);
286
287         icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0;
288
289         sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
290         sk_stop_timer(sk, &icsk->icsk_delack_timer);
291         sk_stop_timer(sk, &sk->sk_timer);
292 }
293
294 EXPORT_SYMBOL(inet_csk_clear_xmit_timers);
295
296 void inet_csk_delete_keepalive_timer(struct sock *sk)
297 {
298         sk_stop_timer(sk, &sk->sk_timer);
299 }
300
301 EXPORT_SYMBOL(inet_csk_delete_keepalive_timer);
302
303 void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len)
304 {
305         sk_reset_timer(sk, &sk->sk_timer, jiffies + len);
306 }
307
308 EXPORT_SYMBOL(inet_csk_reset_keepalive_timer);
309
310 struct dst_entry* inet_csk_route_req(struct sock *sk,
311                                      const struct request_sock *req)
312 {
313         struct rtable *rt;
314         const struct inet_request_sock *ireq = inet_rsk(req);
315         struct ip_options *opt = inet_rsk(req)->opt;
316         struct flowi fl = { .oif = sk->sk_bound_dev_if,
317                             .nl_u = { .ip4_u =
318                                       { .daddr = ((opt && opt->srr) ?
319                                                   opt->faddr :
320                                                   ireq->rmt_addr),
321                                         .saddr = ireq->loc_addr,
322                                         .tos = RT_CONN_FLAGS(sk) } },
323                             .proto = sk->sk_protocol,
324                             .uli_u = { .ports =
325                                        { .sport = inet_sk(sk)->sport,
326                                          .dport = ireq->rmt_port } } };
327
328         security_req_classify_flow(req, &fl);
329         if (ip_route_output_flow(&rt, &fl, sk, 0)) {
330                 IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
331                 return NULL;
332         }
333         if (opt && opt->is_strictroute && rt->rt_dst != rt->rt_gateway) {
334                 ip_rt_put(rt);
335                 IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
336                 return NULL;
337         }
338         return &rt->u.dst;
339 }
340
341 EXPORT_SYMBOL_GPL(inet_csk_route_req);
342
343 static inline u32 inet_synq_hash(const __be32 raddr, const __be16 rport,
344                                  const u32 rnd, const u32 synq_hsize)
345 {
346         return jhash_2words((__force u32)raddr, (__force u32)rport, rnd) & (synq_hsize - 1);
347 }
348
349 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
350 #define AF_INET_FAMILY(fam) ((fam) == AF_INET)
351 #else
352 #define AF_INET_FAMILY(fam) 1
353 #endif
354
355 struct request_sock *inet_csk_search_req(const struct sock *sk,
356                                          struct request_sock ***prevp,
357                                          const __be16 rport, const __be32 raddr,
358                                          const __be32 laddr)
359 {
360         const struct inet_connection_sock *icsk = inet_csk(sk);
361         struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
362         struct request_sock *req, **prev;
363
364         for (prev = &lopt->syn_table[inet_synq_hash(raddr, rport, lopt->hash_rnd,
365                                                     lopt->nr_table_entries)];
366              (req = *prev) != NULL;
367              prev = &req->dl_next) {
368                 const struct inet_request_sock *ireq = inet_rsk(req);
369
370                 if (ireq->rmt_port == rport &&
371                     ireq->rmt_addr == raddr &&
372                     ireq->loc_addr == laddr &&
373                     AF_INET_FAMILY(req->rsk_ops->family)) {
374                         BUG_TRAP(!req->sk);
375                         *prevp = prev;
376                         break;
377                 }
378         }
379
380         return req;
381 }
382
383 EXPORT_SYMBOL_GPL(inet_csk_search_req);
384
385 void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
386                                    unsigned long timeout)
387 {
388         struct inet_connection_sock *icsk = inet_csk(sk);
389         struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
390         const u32 h = inet_synq_hash(inet_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port,
391                                      lopt->hash_rnd, lopt->nr_table_entries);
392
393         reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
394         inet_csk_reqsk_queue_added(sk, timeout);
395 }
396
397 /* Only thing we need from tcp.h */
398 extern int sysctl_tcp_synack_retries;
399
400 EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
401
402 void inet_csk_reqsk_queue_prune(struct sock *parent,
403                                 const unsigned long interval,
404                                 const unsigned long timeout,
405                                 const unsigned long max_rto)
406 {
407         struct inet_connection_sock *icsk = inet_csk(parent);
408         struct request_sock_queue *queue = &icsk->icsk_accept_queue;
409         struct listen_sock *lopt = queue->listen_opt;
410         int max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries;
411         int thresh = max_retries;
412         unsigned long now = jiffies;
413         struct request_sock **reqp, *req;
414         int i, budget;
415
416         if (lopt == NULL || lopt->qlen == 0)
417                 return;
418
419         /* Normally all the openreqs are young and become mature
420          * (i.e. converted to established socket) for first timeout.
421          * If synack was not acknowledged for 3 seconds, it means
422          * one of the following things: synack was lost, ack was lost,
423          * rtt is high or nobody planned to ack (i.e. synflood).
424          * When server is a bit loaded, queue is populated with old
425          * open requests, reducing effective size of queue.
426          * When server is well loaded, queue size reduces to zero
427          * after several minutes of work. It is not synflood,
428          * it is normal operation. The solution is pruning
429          * too old entries overriding normal timeout, when
430          * situation becomes dangerous.
431          *
432          * Essentially, we reserve half of room for young
433          * embrions; and abort old ones without pity, if old
434          * ones are about to clog our table.
435          */
436         if (lopt->qlen>>(lopt->max_qlen_log-1)) {
437                 int young = (lopt->qlen_young<<1);
438
439                 while (thresh > 2) {
440                         if (lopt->qlen < young)
441                                 break;
442                         thresh--;
443                         young <<= 1;
444                 }
445         }
446
447         if (queue->rskq_defer_accept)
448                 max_retries = queue->rskq_defer_accept;
449
450         budget = 2 * (lopt->nr_table_entries / (timeout / interval));
451         i = lopt->clock_hand;
452
453         do {
454                 reqp=&lopt->syn_table[i];
455                 while ((req = *reqp) != NULL) {
456                         if (time_after_eq(now, req->expires)) {
457                                 if ((req->retrans < thresh ||
458                                      (inet_rsk(req)->acked && req->retrans < max_retries))
459                                     && !req->rsk_ops->rtx_syn_ack(parent, req, NULL)) {
460                                         unsigned long timeo;
461
462                                         if (req->retrans++ == 0)
463                                                 lopt->qlen_young--;
464                                         timeo = min((timeout << req->retrans), max_rto);
465                                         req->expires = now + timeo;
466                                         reqp = &req->dl_next;
467                                         continue;
468                                 }
469
470                                 /* Drop this request */
471                                 inet_csk_reqsk_queue_unlink(parent, req, reqp);
472                                 reqsk_queue_removed(queue, req);
473                                 reqsk_free(req);
474                                 continue;
475                         }
476                         reqp = &req->dl_next;
477                 }
478
479                 i = (i + 1) & (lopt->nr_table_entries - 1);
480
481         } while (--budget > 0);
482
483         lopt->clock_hand = i;
484
485         if (lopt->qlen)
486                 inet_csk_reset_keepalive_timer(parent, interval);
487 }
488
489 EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_prune);
490
491 struct sock *inet_csk_clone(struct sock *sk, const struct request_sock *req,
492                             const gfp_t priority)
493 {
494         struct sock *newsk = sk_clone(sk, priority);
495
496         if (newsk != NULL) {
497                 struct inet_connection_sock *newicsk = inet_csk(newsk);
498
499                 newsk->sk_state = TCP_SYN_RECV;
500                 newicsk->icsk_bind_hash = NULL;
501
502                 inet_sk(newsk)->dport = inet_rsk(req)->rmt_port;
503                 newsk->sk_write_space = sk_stream_write_space;
504
505                 newicsk->icsk_retransmits = 0;
506                 newicsk->icsk_backoff     = 0;
507                 newicsk->icsk_probes_out  = 0;
508
509                 /* Deinitialize accept_queue to trap illegal accesses. */
510                 memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue));
511
512                 security_inet_csk_clone(newsk, req);
513         }
514         return newsk;
515 }
516
517 EXPORT_SYMBOL_GPL(inet_csk_clone);
518
519 /*
520  * At this point, there should be no process reference to this
521  * socket, and thus no user references at all.  Therefore we
522  * can assume the socket waitqueue is inactive and nobody will
523  * try to jump onto it.
524  */
525 void inet_csk_destroy_sock(struct sock *sk)
526 {
527         BUG_TRAP(sk->sk_state == TCP_CLOSE);
528         BUG_TRAP(sock_flag(sk, SOCK_DEAD));
529
530         /* It cannot be in hash table! */
531         BUG_TRAP(sk_unhashed(sk));
532
533         /* If it has not 0 inet_sk(sk)->num, it must be bound */
534         BUG_TRAP(!inet_sk(sk)->num || inet_csk(sk)->icsk_bind_hash);
535
536         sk->sk_prot->destroy(sk);
537
538         sk_stream_kill_queues(sk);
539
540         xfrm_sk_free_policy(sk);
541
542         sk_refcnt_debug_release(sk);
543
544         atomic_dec(sk->sk_prot->orphan_count);
545         sock_put(sk);
546 }
547
548 EXPORT_SYMBOL(inet_csk_destroy_sock);
549
550 int inet_csk_listen_start(struct sock *sk, const int nr_table_entries)
551 {
552         struct inet_sock *inet = inet_sk(sk);
553         struct inet_connection_sock *icsk = inet_csk(sk);
554         int rc = reqsk_queue_alloc(&icsk->icsk_accept_queue, nr_table_entries);
555
556         if (rc != 0)
557                 return rc;
558
559         sk->sk_max_ack_backlog = 0;
560         sk->sk_ack_backlog = 0;
561         inet_csk_delack_init(sk);
562
563         /* There is race window here: we announce ourselves listening,
564          * but this transition is still not validated by get_port().
565          * It is OK, because this socket enters to hash table only
566          * after validation is complete.
567          */
568         sk->sk_state = TCP_LISTEN;
569         if (!sk->sk_prot->get_port(sk, inet->num)) {
570                 inet->sport = htons(inet->num);
571
572                 sk_dst_reset(sk);
573                 sk->sk_prot->hash(sk);
574
575                 return 0;
576         }
577
578         sk->sk_state = TCP_CLOSE;
579         __reqsk_queue_destroy(&icsk->icsk_accept_queue);
580         return -EADDRINUSE;
581 }
582
583 EXPORT_SYMBOL_GPL(inet_csk_listen_start);
584
585 /*
586  *      This routine closes sockets which have been at least partially
587  *      opened, but not yet accepted.
588  */
589 void inet_csk_listen_stop(struct sock *sk)
590 {
591         struct inet_connection_sock *icsk = inet_csk(sk);
592         struct request_sock *acc_req;
593         struct request_sock *req;
594
595         inet_csk_delete_keepalive_timer(sk);
596
597         /* make all the listen_opt local to us */
598         acc_req = reqsk_queue_yank_acceptq(&icsk->icsk_accept_queue);
599
600         /* Following specs, it would be better either to send FIN
601          * (and enter FIN-WAIT-1, it is normal close)
602          * or to send active reset (abort).
603          * Certainly, it is pretty dangerous while synflood, but it is
604          * bad justification for our negligence 8)
605          * To be honest, we are not able to make either
606          * of the variants now.                 --ANK
607          */
608         reqsk_queue_destroy(&icsk->icsk_accept_queue);
609
610         while ((req = acc_req) != NULL) {
611                 struct sock *child = req->sk;
612
613                 acc_req = req->dl_next;
614
615                 local_bh_disable();
616                 bh_lock_sock(child);
617                 BUG_TRAP(!sock_owned_by_user(child));
618                 sock_hold(child);
619
620                 sk->sk_prot->disconnect(child, O_NONBLOCK);
621
622                 sock_orphan(child);
623
624                 atomic_inc(sk->sk_prot->orphan_count);
625
626                 inet_csk_destroy_sock(child);
627
628                 bh_unlock_sock(child);
629                 local_bh_enable();
630                 sock_put(child);
631
632                 sk_acceptq_removed(sk);
633                 __reqsk_free(req);
634         }
635         BUG_TRAP(!sk->sk_ack_backlog);
636 }
637
638 EXPORT_SYMBOL_GPL(inet_csk_listen_stop);
639
640 void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
641 {
642         struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
643         const struct inet_sock *inet = inet_sk(sk);
644
645         sin->sin_family         = AF_INET;
646         sin->sin_addr.s_addr    = inet->daddr;
647         sin->sin_port           = inet->dport;
648 }
649
650 EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr);
651
652 int inet_csk_ctl_sock_create(struct socket **sock, unsigned short family,
653                              unsigned short type, unsigned char protocol)
654 {
655         int rc = sock_create_kern(family, type, protocol, sock);
656
657         if (rc == 0) {
658                 (*sock)->sk->sk_allocation = GFP_ATOMIC;
659                 inet_sk((*sock)->sk)->uc_ttl = -1;
660                 /*
661                  * Unhash it so that IP input processing does not even see it,
662                  * we do not wish this socket to see incoming packets.
663                  */
664                 (*sock)->sk->sk_prot->unhash((*sock)->sk);
665         }
666         return rc;
667 }
668
669 EXPORT_SYMBOL_GPL(inet_csk_ctl_sock_create);
670
671 #ifdef CONFIG_COMPAT
672 int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
673                                char __user *optval, int __user *optlen)
674 {
675         const struct inet_connection_sock *icsk = inet_csk(sk);
676
677         if (icsk->icsk_af_ops->compat_getsockopt != NULL)
678                 return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname,
679                                                             optval, optlen);
680         return icsk->icsk_af_ops->getsockopt(sk, level, optname,
681                                              optval, optlen);
682 }
683
684 EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt);
685
686 int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
687                                char __user *optval, int optlen)
688 {
689         const struct inet_connection_sock *icsk = inet_csk(sk);
690
691         if (icsk->icsk_af_ops->compat_setsockopt != NULL)
692                 return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname,
693                                                             optval, optlen);
694         return icsk->icsk_af_ops->setsockopt(sk, level, optname,
695                                              optval, optlen);
696 }
697
698 EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt);
699 #endif