432c570c9f5f5cba8a1eea970e5e9e9c29206349
[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 DEFINE_SEQLOCK(sysctl_port_range_lock);
37
38 void inet_get_local_port_range(int *low, int *high)
39 {
40         unsigned seq;
41         do {
42                 seq = read_seqbegin(&sysctl_port_range_lock);
43
44                 *low = sysctl_local_port_range[0];
45                 *high = sysctl_local_port_range[1];
46         } while (read_seqretry(&sysctl_port_range_lock, seq));
47 }
48 EXPORT_SYMBOL(inet_get_local_port_range);
49
50 int inet_csk_bind_conflict(const struct sock *sk,
51                            const struct inet_bind_bucket *tb)
52 {
53         const __be32 sk_rcv_saddr = inet_rcv_saddr(sk);
54         struct sock *sk2;
55         struct hlist_node *node;
56         int reuse = sk->sk_reuse;
57
58         /*
59          * Unlike other sk lookup places we do not check
60          * for sk_net here, since _all_ the socks listed
61          * in tb->owners list belong to the same net - the
62          * one this bucket belongs to.
63          */
64
65         sk_for_each_bound(sk2, node, &tb->owners) {
66                 if (sk != sk2 &&
67                     !inet_v6_ipv6only(sk2) &&
68                     (!sk->sk_bound_dev_if ||
69                      !sk2->sk_bound_dev_if ||
70                      sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
71                         if (!reuse || !sk2->sk_reuse ||
72                             sk2->sk_state == TCP_LISTEN) {
73                                 const __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
74                                 if (!sk2_rcv_saddr || !sk_rcv_saddr ||
75                                     sk2_rcv_saddr == sk_rcv_saddr)
76                                         break;
77                         }
78                 }
79         }
80         return node != NULL;
81 }
82
83 EXPORT_SYMBOL_GPL(inet_csk_bind_conflict);
84
85 /* Obtain a reference to a local port for the given sock,
86  * if snum is zero it means select any available local port.
87  */
88 int inet_csk_get_port(struct sock *sk, unsigned short snum)
89 {
90         struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
91         struct inet_bind_hashbucket *head;
92         struct hlist_node *node;
93         struct inet_bind_bucket *tb;
94         int ret;
95         struct net *net = sock_net(sk);
96
97         local_bh_disable();
98         if (!snum) {
99                 int remaining, rover, low, high;
100
101                 inet_get_local_port_range(&low, &high);
102                 remaining = (high - low) + 1;
103                 rover = net_random() % remaining + low;
104
105                 do {
106                         head = &hashinfo->bhash[inet_bhashfn(net, rover,
107                                         hashinfo->bhash_size)];
108                         spin_lock(&head->lock);
109                         inet_bind_bucket_for_each(tb, node, &head->chain)
110                                 if (tb->ib_net == net && tb->port == rover)
111                                         goto next;
112                         break;
113                 next:
114                         spin_unlock(&head->lock);
115                         if (++rover > high)
116                                 rover = low;
117                 } while (--remaining > 0);
118
119                 /* Exhausted local port range during search?  It is not
120                  * possible for us to be holding one of the bind hash
121                  * locks if this test triggers, because if 'remaining'
122                  * drops to zero, we broke out of the do/while loop at
123                  * the top level, not from the 'break;' statement.
124                  */
125                 ret = 1;
126                 if (remaining <= 0)
127                         goto fail;
128
129                 /* OK, here is the one we will use.  HEAD is
130                  * non-NULL and we hold it's mutex.
131                  */
132                 snum = rover;
133         } else {
134                 head = &hashinfo->bhash[inet_bhashfn(net, snum,
135                                 hashinfo->bhash_size)];
136                 spin_lock(&head->lock);
137                 inet_bind_bucket_for_each(tb, node, &head->chain)
138                         if (tb->ib_net == net && tb->port == snum)
139                                 goto tb_found;
140         }
141         tb = NULL;
142         goto tb_not_found;
143 tb_found:
144         if (!hlist_empty(&tb->owners)) {
145                 if (tb->fastreuse > 0 &&
146                     sk->sk_reuse && sk->sk_state != TCP_LISTEN) {
147                         goto success;
148                 } else {
149                         ret = 1;
150                         if (inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb))
151                                 goto fail_unlock;
152                 }
153         }
154 tb_not_found:
155         ret = 1;
156         if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep,
157                                         net, head, snum)) == NULL)
158                 goto fail_unlock;
159         if (hlist_empty(&tb->owners)) {
160                 if (sk->sk_reuse && sk->sk_state != TCP_LISTEN)
161                         tb->fastreuse = 1;
162                 else
163                         tb->fastreuse = 0;
164         } else if (tb->fastreuse &&
165                    (!sk->sk_reuse || sk->sk_state == TCP_LISTEN))
166                 tb->fastreuse = 0;
167 success:
168         if (!inet_csk(sk)->icsk_bind_hash)
169                 inet_bind_hash(sk, tb, snum);
170         WARN_ON(inet_csk(sk)->icsk_bind_hash != tb);
171         ret = 0;
172
173 fail_unlock:
174         spin_unlock(&head->lock);
175 fail:
176         local_bh_enable();
177         return ret;
178 }
179
180 EXPORT_SYMBOL_GPL(inet_csk_get_port);
181
182 /*
183  * Wait for an incoming connection, avoid race conditions. This must be called
184  * with the socket locked.
185  */
186 static int inet_csk_wait_for_connect(struct sock *sk, long timeo)
187 {
188         struct inet_connection_sock *icsk = inet_csk(sk);
189         DEFINE_WAIT(wait);
190         int err;
191
192         /*
193          * True wake-one mechanism for incoming connections: only
194          * one process gets woken up, not the 'whole herd'.
195          * Since we do not 'race & poll' for established sockets
196          * anymore, the common case will execute the loop only once.
197          *
198          * Subtle issue: "add_wait_queue_exclusive()" will be added
199          * after any current non-exclusive waiters, and we know that
200          * it will always _stay_ after any new non-exclusive waiters
201          * because all non-exclusive waiters are added at the
202          * beginning of the wait-queue. As such, it's ok to "drop"
203          * our exclusiveness temporarily when we get woken up without
204          * having to remove and re-insert us on the wait queue.
205          */
206         for (;;) {
207                 prepare_to_wait_exclusive(sk->sk_sleep, &wait,
208                                           TASK_INTERRUPTIBLE);
209                 release_sock(sk);
210                 if (reqsk_queue_empty(&icsk->icsk_accept_queue))
211                         timeo = schedule_timeout(timeo);
212                 lock_sock(sk);
213                 err = 0;
214                 if (!reqsk_queue_empty(&icsk->icsk_accept_queue))
215                         break;
216                 err = -EINVAL;
217                 if (sk->sk_state != TCP_LISTEN)
218                         break;
219                 err = sock_intr_errno(timeo);
220                 if (signal_pending(current))
221                         break;
222                 err = -EAGAIN;
223                 if (!timeo)
224                         break;
225         }
226         finish_wait(sk->sk_sleep, &wait);
227         return err;
228 }
229
230 /*
231  * This will accept the next outstanding connection.
232  */
233 struct sock *inet_csk_accept(struct sock *sk, int flags, int *err)
234 {
235         struct inet_connection_sock *icsk = inet_csk(sk);
236         struct sock *newsk;
237         int error;
238
239         lock_sock(sk);
240
241         /* We need to make sure that this socket is listening,
242          * and that it has something pending.
243          */
244         error = -EINVAL;
245         if (sk->sk_state != TCP_LISTEN)
246                 goto out_err;
247
248         /* Find already established connection */
249         if (reqsk_queue_empty(&icsk->icsk_accept_queue)) {
250                 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
251
252                 /* If this is a non blocking socket don't sleep */
253                 error = -EAGAIN;
254                 if (!timeo)
255                         goto out_err;
256
257                 error = inet_csk_wait_for_connect(sk, timeo);
258                 if (error)
259                         goto out_err;
260         }
261
262         newsk = reqsk_queue_get_child(&icsk->icsk_accept_queue, sk);
263         WARN_ON(newsk->sk_state == TCP_SYN_RECV);
264 out:
265         release_sock(sk);
266         return newsk;
267 out_err:
268         newsk = NULL;
269         *err = error;
270         goto out;
271 }
272
273 EXPORT_SYMBOL(inet_csk_accept);
274
275 /*
276  * Using different timers for retransmit, delayed acks and probes
277  * We may wish use just one timer maintaining a list of expire jiffies
278  * to optimize.
279  */
280 void inet_csk_init_xmit_timers(struct sock *sk,
281                                void (*retransmit_handler)(unsigned long),
282                                void (*delack_handler)(unsigned long),
283                                void (*keepalive_handler)(unsigned long))
284 {
285         struct inet_connection_sock *icsk = inet_csk(sk);
286
287         setup_timer(&icsk->icsk_retransmit_timer, retransmit_handler,
288                         (unsigned long)sk);
289         setup_timer(&icsk->icsk_delack_timer, delack_handler,
290                         (unsigned long)sk);
291         setup_timer(&sk->sk_timer, keepalive_handler, (unsigned long)sk);
292         icsk->icsk_pending = icsk->icsk_ack.pending = 0;
293 }
294
295 EXPORT_SYMBOL(inet_csk_init_xmit_timers);
296
297 void inet_csk_clear_xmit_timers(struct sock *sk)
298 {
299         struct inet_connection_sock *icsk = inet_csk(sk);
300
301         icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0;
302
303         sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
304         sk_stop_timer(sk, &icsk->icsk_delack_timer);
305         sk_stop_timer(sk, &sk->sk_timer);
306 }
307
308 EXPORT_SYMBOL(inet_csk_clear_xmit_timers);
309
310 void inet_csk_delete_keepalive_timer(struct sock *sk)
311 {
312         sk_stop_timer(sk, &sk->sk_timer);
313 }
314
315 EXPORT_SYMBOL(inet_csk_delete_keepalive_timer);
316
317 void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len)
318 {
319         sk_reset_timer(sk, &sk->sk_timer, jiffies + len);
320 }
321
322 EXPORT_SYMBOL(inet_csk_reset_keepalive_timer);
323
324 struct dst_entry* inet_csk_route_req(struct sock *sk,
325                                      const struct request_sock *req)
326 {
327         struct rtable *rt;
328         const struct inet_request_sock *ireq = inet_rsk(req);
329         struct ip_options *opt = inet_rsk(req)->opt;
330         struct flowi fl = { .oif = sk->sk_bound_dev_if,
331                             .nl_u = { .ip4_u =
332                                       { .daddr = ((opt && opt->srr) ?
333                                                   opt->faddr :
334                                                   ireq->rmt_addr),
335                                         .saddr = ireq->loc_addr,
336                                         .tos = RT_CONN_FLAGS(sk) } },
337                             .proto = sk->sk_protocol,
338                             .flags = inet_sk_flowi_flags(sk),
339                             .uli_u = { .ports =
340                                        { .sport = inet_sk(sk)->sport,
341                                          .dport = ireq->rmt_port } } };
342         struct net *net = sock_net(sk);
343
344         security_req_classify_flow(req, &fl);
345         if (ip_route_output_flow(net, &rt, &fl, sk, 0)) {
346                 IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
347                 return NULL;
348         }
349         if (opt && opt->is_strictroute && rt->rt_dst != rt->rt_gateway) {
350                 ip_rt_put(rt);
351                 IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
352                 return NULL;
353         }
354         return &rt->u.dst;
355 }
356
357 EXPORT_SYMBOL_GPL(inet_csk_route_req);
358
359 static inline u32 inet_synq_hash(const __be32 raddr, const __be16 rport,
360                                  const u32 rnd, const u32 synq_hsize)
361 {
362         return jhash_2words((__force u32)raddr, (__force u32)rport, rnd) & (synq_hsize - 1);
363 }
364
365 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
366 #define AF_INET_FAMILY(fam) ((fam) == AF_INET)
367 #else
368 #define AF_INET_FAMILY(fam) 1
369 #endif
370
371 struct request_sock *inet_csk_search_req(const struct sock *sk,
372                                          struct request_sock ***prevp,
373                                          const __be16 rport, const __be32 raddr,
374                                          const __be32 laddr)
375 {
376         const struct inet_connection_sock *icsk = inet_csk(sk);
377         struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
378         struct request_sock *req, **prev;
379
380         for (prev = &lopt->syn_table[inet_synq_hash(raddr, rport, lopt->hash_rnd,
381                                                     lopt->nr_table_entries)];
382              (req = *prev) != NULL;
383              prev = &req->dl_next) {
384                 const struct inet_request_sock *ireq = inet_rsk(req);
385
386                 if (ireq->rmt_port == rport &&
387                     ireq->rmt_addr == raddr &&
388                     ireq->loc_addr == laddr &&
389                     AF_INET_FAMILY(req->rsk_ops->family)) {
390                         WARN_ON(req->sk);
391                         *prevp = prev;
392                         break;
393                 }
394         }
395
396         return req;
397 }
398
399 EXPORT_SYMBOL_GPL(inet_csk_search_req);
400
401 void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
402                                    unsigned long timeout)
403 {
404         struct inet_connection_sock *icsk = inet_csk(sk);
405         struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
406         const u32 h = inet_synq_hash(inet_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port,
407                                      lopt->hash_rnd, lopt->nr_table_entries);
408
409         reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
410         inet_csk_reqsk_queue_added(sk, timeout);
411 }
412
413 /* Only thing we need from tcp.h */
414 extern int sysctl_tcp_synack_retries;
415
416 EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
417
418 void inet_csk_reqsk_queue_prune(struct sock *parent,
419                                 const unsigned long interval,
420                                 const unsigned long timeout,
421                                 const unsigned long max_rto)
422 {
423         struct inet_connection_sock *icsk = inet_csk(parent);
424         struct request_sock_queue *queue = &icsk->icsk_accept_queue;
425         struct listen_sock *lopt = queue->listen_opt;
426         int max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries;
427         int thresh = max_retries;
428         unsigned long now = jiffies;
429         struct request_sock **reqp, *req;
430         int i, budget;
431
432         if (lopt == NULL || lopt->qlen == 0)
433                 return;
434
435         /* Normally all the openreqs are young and become mature
436          * (i.e. converted to established socket) for first timeout.
437          * If synack was not acknowledged for 3 seconds, it means
438          * one of the following things: synack was lost, ack was lost,
439          * rtt is high or nobody planned to ack (i.e. synflood).
440          * When server is a bit loaded, queue is populated with old
441          * open requests, reducing effective size of queue.
442          * When server is well loaded, queue size reduces to zero
443          * after several minutes of work. It is not synflood,
444          * it is normal operation. The solution is pruning
445          * too old entries overriding normal timeout, when
446          * situation becomes dangerous.
447          *
448          * Essentially, we reserve half of room for young
449          * embrions; and abort old ones without pity, if old
450          * ones are about to clog our table.
451          */
452         if (lopt->qlen>>(lopt->max_qlen_log-1)) {
453                 int young = (lopt->qlen_young<<1);
454
455                 while (thresh > 2) {
456                         if (lopt->qlen < young)
457                                 break;
458                         thresh--;
459                         young <<= 1;
460                 }
461         }
462
463         if (queue->rskq_defer_accept)
464                 max_retries = queue->rskq_defer_accept;
465
466         budget = 2 * (lopt->nr_table_entries / (timeout / interval));
467         i = lopt->clock_hand;
468
469         do {
470                 reqp=&lopt->syn_table[i];
471                 while ((req = *reqp) != NULL) {
472                         if (time_after_eq(now, req->expires)) {
473                                 if ((req->retrans < thresh ||
474                                      (inet_rsk(req)->acked && req->retrans < max_retries))
475                                     && !req->rsk_ops->rtx_syn_ack(parent, req)) {
476                                         unsigned long timeo;
477
478                                         if (req->retrans++ == 0)
479                                                 lopt->qlen_young--;
480                                         timeo = min((timeout << req->retrans), max_rto);
481                                         req->expires = now + timeo;
482                                         reqp = &req->dl_next;
483                                         continue;
484                                 }
485
486                                 /* Drop this request */
487                                 inet_csk_reqsk_queue_unlink(parent, req, reqp);
488                                 reqsk_queue_removed(queue, req);
489                                 reqsk_free(req);
490                                 continue;
491                         }
492                         reqp = &req->dl_next;
493                 }
494
495                 i = (i + 1) & (lopt->nr_table_entries - 1);
496
497         } while (--budget > 0);
498
499         lopt->clock_hand = i;
500
501         if (lopt->qlen)
502                 inet_csk_reset_keepalive_timer(parent, interval);
503 }
504
505 EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_prune);
506
507 struct sock *inet_csk_clone(struct sock *sk, const struct request_sock *req,
508                             const gfp_t priority)
509 {
510         struct sock *newsk = sk_clone(sk, priority);
511
512         if (newsk != NULL) {
513                 struct inet_connection_sock *newicsk = inet_csk(newsk);
514
515                 newsk->sk_state = TCP_SYN_RECV;
516                 newicsk->icsk_bind_hash = NULL;
517
518                 inet_sk(newsk)->dport = inet_rsk(req)->rmt_port;
519                 newsk->sk_write_space = sk_stream_write_space;
520
521                 newicsk->icsk_retransmits = 0;
522                 newicsk->icsk_backoff     = 0;
523                 newicsk->icsk_probes_out  = 0;
524
525                 /* Deinitialize accept_queue to trap illegal accesses. */
526                 memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue));
527
528                 security_inet_csk_clone(newsk, req);
529         }
530         return newsk;
531 }
532
533 EXPORT_SYMBOL_GPL(inet_csk_clone);
534
535 /*
536  * At this point, there should be no process reference to this
537  * socket, and thus no user references at all.  Therefore we
538  * can assume the socket waitqueue is inactive and nobody will
539  * try to jump onto it.
540  */
541 void inet_csk_destroy_sock(struct sock *sk)
542 {
543         WARN_ON(sk->sk_state != TCP_CLOSE);
544         WARN_ON(!sock_flag(sk, SOCK_DEAD));
545
546         /* It cannot be in hash table! */
547         WARN_ON(!sk_unhashed(sk));
548
549         /* If it has not 0 inet_sk(sk)->num, it must be bound */
550         WARN_ON(inet_sk(sk)->num && !inet_csk(sk)->icsk_bind_hash);
551
552         sk->sk_prot->destroy(sk);
553
554         sk_stream_kill_queues(sk);
555
556         xfrm_sk_free_policy(sk);
557
558         sk_refcnt_debug_release(sk);
559
560         atomic_dec(sk->sk_prot->orphan_count);
561         sock_put(sk);
562 }
563
564 EXPORT_SYMBOL(inet_csk_destroy_sock);
565
566 int inet_csk_listen_start(struct sock *sk, const int nr_table_entries)
567 {
568         struct inet_sock *inet = inet_sk(sk);
569         struct inet_connection_sock *icsk = inet_csk(sk);
570         int rc = reqsk_queue_alloc(&icsk->icsk_accept_queue, nr_table_entries);
571
572         if (rc != 0)
573                 return rc;
574
575         sk->sk_max_ack_backlog = 0;
576         sk->sk_ack_backlog = 0;
577         inet_csk_delack_init(sk);
578
579         /* There is race window here: we announce ourselves listening,
580          * but this transition is still not validated by get_port().
581          * It is OK, because this socket enters to hash table only
582          * after validation is complete.
583          */
584         sk->sk_state = TCP_LISTEN;
585         if (!sk->sk_prot->get_port(sk, inet->num)) {
586                 inet->sport = htons(inet->num);
587
588                 sk_dst_reset(sk);
589                 sk->sk_prot->hash(sk);
590
591                 return 0;
592         }
593
594         sk->sk_state = TCP_CLOSE;
595         __reqsk_queue_destroy(&icsk->icsk_accept_queue);
596         return -EADDRINUSE;
597 }
598
599 EXPORT_SYMBOL_GPL(inet_csk_listen_start);
600
601 /*
602  *      This routine closes sockets which have been at least partially
603  *      opened, but not yet accepted.
604  */
605 void inet_csk_listen_stop(struct sock *sk)
606 {
607         struct inet_connection_sock *icsk = inet_csk(sk);
608         struct request_sock *acc_req;
609         struct request_sock *req;
610
611         inet_csk_delete_keepalive_timer(sk);
612
613         /* make all the listen_opt local to us */
614         acc_req = reqsk_queue_yank_acceptq(&icsk->icsk_accept_queue);
615
616         /* Following specs, it would be better either to send FIN
617          * (and enter FIN-WAIT-1, it is normal close)
618          * or to send active reset (abort).
619          * Certainly, it is pretty dangerous while synflood, but it is
620          * bad justification for our negligence 8)
621          * To be honest, we are not able to make either
622          * of the variants now.                 --ANK
623          */
624         reqsk_queue_destroy(&icsk->icsk_accept_queue);
625
626         while ((req = acc_req) != NULL) {
627                 struct sock *child = req->sk;
628
629                 acc_req = req->dl_next;
630
631                 local_bh_disable();
632                 bh_lock_sock(child);
633                 WARN_ON(sock_owned_by_user(child));
634                 sock_hold(child);
635
636                 sk->sk_prot->disconnect(child, O_NONBLOCK);
637
638                 sock_orphan(child);
639
640                 atomic_inc(sk->sk_prot->orphan_count);
641
642                 inet_csk_destroy_sock(child);
643
644                 bh_unlock_sock(child);
645                 local_bh_enable();
646                 sock_put(child);
647
648                 sk_acceptq_removed(sk);
649                 __reqsk_free(req);
650         }
651         WARN_ON(sk->sk_ack_backlog);
652 }
653
654 EXPORT_SYMBOL_GPL(inet_csk_listen_stop);
655
656 void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
657 {
658         struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
659         const struct inet_sock *inet = inet_sk(sk);
660
661         sin->sin_family         = AF_INET;
662         sin->sin_addr.s_addr    = inet->daddr;
663         sin->sin_port           = inet->dport;
664 }
665
666 EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr);
667
668 #ifdef CONFIG_COMPAT
669 int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
670                                char __user *optval, int __user *optlen)
671 {
672         const struct inet_connection_sock *icsk = inet_csk(sk);
673
674         if (icsk->icsk_af_ops->compat_getsockopt != NULL)
675                 return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname,
676                                                             optval, optlen);
677         return icsk->icsk_af_ops->getsockopt(sk, level, optname,
678                                              optval, optlen);
679 }
680
681 EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt);
682
683 int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
684                                char __user *optval, int optlen)
685 {
686         const struct inet_connection_sock *icsk = inet_csk(sk);
687
688         if (icsk->icsk_af_ops->compat_setsockopt != NULL)
689                 return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname,
690                                                             optval, optlen);
691         return icsk->icsk_af_ops->setsockopt(sk, level, optname,
692                                              optval, optlen);
693 }
694
695 EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt);
696 #endif