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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#include <net/tcp.h>
27#include <net/sock_reuseport.h>
28
29#ifdef INET_CSK_DEBUG
30const char inet_csk_timer_bug_msg[] = "inet_csk BUG: unknown timer value\n";
31EXPORT_SYMBOL(inet_csk_timer_bug_msg);
32#endif
33
34void inet_get_local_port_range(struct net *net, int *low, int *high)
35{
36 unsigned int seq;
37
38 do {
39 seq = read_seqbegin(&net->ipv4.ip_local_ports.lock);
40
41 *low = net->ipv4.ip_local_ports.range[0];
42 *high = net->ipv4.ip_local_ports.range[1];
43 } while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq));
44}
45EXPORT_SYMBOL(inet_get_local_port_range);
46
47int inet_csk_bind_conflict(const struct sock *sk,
48 const struct inet_bind_bucket *tb, bool relax)
49{
50 struct sock *sk2;
51 int reuse = sk->sk_reuse;
52 int reuseport = sk->sk_reuseport;
53 kuid_t uid = sock_i_uid((struct sock *)sk);
54
55
56
57
58
59
60
61
62 sk_for_each_bound(sk2, &tb->owners) {
63 if (sk != sk2 &&
64 !inet_v6_ipv6only(sk2) &&
65 (!sk->sk_bound_dev_if ||
66 !sk2->sk_bound_dev_if ||
67 sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
68 if ((!reuse || !sk2->sk_reuse ||
69 sk2->sk_state == TCP_LISTEN) &&
70 (!reuseport || !sk2->sk_reuseport ||
71 rcu_access_pointer(sk->sk_reuseport_cb) ||
72 (sk2->sk_state != TCP_TIME_WAIT &&
73 !uid_eq(uid, sock_i_uid(sk2))))) {
74
75 if (!sk2->sk_rcv_saddr || !sk->sk_rcv_saddr ||
76 sk2->sk_rcv_saddr == sk->sk_rcv_saddr)
77 break;
78 }
79 if (!relax && reuse && sk2->sk_reuse &&
80 sk2->sk_state != TCP_LISTEN) {
81
82 if (!sk2->sk_rcv_saddr || !sk->sk_rcv_saddr ||
83 sk2->sk_rcv_saddr == sk->sk_rcv_saddr)
84 break;
85 }
86 }
87 }
88 return sk2 != NULL;
89}
90EXPORT_SYMBOL_GPL(inet_csk_bind_conflict);
91
92
93
94
95
96int inet_csk_get_port(struct sock *sk, unsigned short snum)
97{
98 bool reuse = sk->sk_reuse && sk->sk_state != TCP_LISTEN;
99 struct inet_hashinfo *hinfo = sk->sk_prot->h.hashinfo;
100 int ret = 1, attempts = 5, port = snum;
101 int smallest_size = -1, smallest_port;
102 struct inet_bind_hashbucket *head;
103 struct net *net = sock_net(sk);
104 int i, low, high, attempt_half;
105 struct inet_bind_bucket *tb;
106 kuid_t uid = sock_i_uid(sk);
107 u32 remaining, offset;
108
109 if (port) {
110have_port:
111 head = &hinfo->bhash[inet_bhashfn(net, port,
112 hinfo->bhash_size)];
113 spin_lock_bh(&head->lock);
114 inet_bind_bucket_for_each(tb, &head->chain)
115 if (net_eq(ib_net(tb), net) && tb->port == port)
116 goto tb_found;
117
118 goto tb_not_found;
119 }
120again:
121 attempt_half = (sk->sk_reuse == SK_CAN_REUSE) ? 1 : 0;
122other_half_scan:
123 inet_get_local_port_range(net, &low, &high);
124 high++;
125 if (high - low < 4)
126 attempt_half = 0;
127 if (attempt_half) {
128 int half = low + (((high - low) >> 2) << 1);
129
130 if (attempt_half == 1)
131 high = half;
132 else
133 low = half;
134 }
135 remaining = high - low;
136 if (likely(remaining > 1))
137 remaining &= ~1U;
138
139 offset = prandom_u32() % remaining;
140
141
142
143 offset |= 1U;
144 smallest_size = -1;
145 smallest_port = low;
146
147other_parity_scan:
148 port = low + offset;
149 for (i = 0; i < remaining; i += 2, port += 2) {
150 if (unlikely(port >= high))
151 port -= remaining;
152 if (inet_is_local_reserved_port(net, port))
153 continue;
154 head = &hinfo->bhash[inet_bhashfn(net, port,
155 hinfo->bhash_size)];
156 spin_lock_bh(&head->lock);
157 inet_bind_bucket_for_each(tb, &head->chain)
158 if (net_eq(ib_net(tb), net) && tb->port == port) {
159 if (((tb->fastreuse > 0 && reuse) ||
160 (tb->fastreuseport > 0 &&
161 sk->sk_reuseport &&
162 !rcu_access_pointer(sk->sk_reuseport_cb) &&
163 uid_eq(tb->fastuid, uid))) &&
164 (tb->num_owners < smallest_size || smallest_size == -1)) {
165 smallest_size = tb->num_owners;
166 smallest_port = port;
167 }
168 if (!inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb, false))
169 goto tb_found;
170 goto next_port;
171 }
172 goto tb_not_found;
173next_port:
174 spin_unlock_bh(&head->lock);
175 cond_resched();
176 }
177
178 if (smallest_size != -1) {
179 port = smallest_port;
180 goto have_port;
181 }
182 offset--;
183 if (!(offset & 1))
184 goto other_parity_scan;
185
186 if (attempt_half == 1) {
187
188 attempt_half = 2;
189 goto other_half_scan;
190 }
191 return ret;
192
193tb_not_found:
194 tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
195 net, head, port);
196 if (!tb)
197 goto fail_unlock;
198tb_found:
199 if (!hlist_empty(&tb->owners)) {
200 if (sk->sk_reuse == SK_FORCE_REUSE)
201 goto success;
202
203 if (((tb->fastreuse > 0 && reuse) ||
204 (tb->fastreuseport > 0 &&
205 !rcu_access_pointer(sk->sk_reuseport_cb) &&
206 sk->sk_reuseport && uid_eq(tb->fastuid, uid))) &&
207 smallest_size == -1)
208 goto success;
209 if (inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb, true)) {
210 if ((reuse ||
211 (tb->fastreuseport > 0 &&
212 sk->sk_reuseport &&
213 !rcu_access_pointer(sk->sk_reuseport_cb) &&
214 uid_eq(tb->fastuid, uid))) &&
215 smallest_size != -1 && --attempts >= 0) {
216 spin_unlock_bh(&head->lock);
217 goto again;
218 }
219 goto fail_unlock;
220 }
221 if (!reuse)
222 tb->fastreuse = 0;
223 if (!sk->sk_reuseport || !uid_eq(tb->fastuid, uid))
224 tb->fastreuseport = 0;
225 } else {
226 tb->fastreuse = reuse;
227 if (sk->sk_reuseport) {
228 tb->fastreuseport = 1;
229 tb->fastuid = uid;
230 } else {
231 tb->fastreuseport = 0;
232 }
233 }
234success:
235 if (!inet_csk(sk)->icsk_bind_hash)
236 inet_bind_hash(sk, tb, port);
237 WARN_ON(inet_csk(sk)->icsk_bind_hash != tb);
238 ret = 0;
239
240fail_unlock:
241 spin_unlock_bh(&head->lock);
242 return ret;
243}
244EXPORT_SYMBOL_GPL(inet_csk_get_port);
245
246
247
248
249
250static int inet_csk_wait_for_connect(struct sock *sk, long timeo)
251{
252 struct inet_connection_sock *icsk = inet_csk(sk);
253 DEFINE_WAIT(wait);
254 int err;
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270 for (;;) {
271 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
272 TASK_INTERRUPTIBLE);
273 release_sock(sk);
274 if (reqsk_queue_empty(&icsk->icsk_accept_queue))
275 timeo = schedule_timeout(timeo);
276 sched_annotate_sleep();
277 lock_sock(sk);
278 err = 0;
279 if (!reqsk_queue_empty(&icsk->icsk_accept_queue))
280 break;
281 err = -EINVAL;
282 if (sk->sk_state != TCP_LISTEN)
283 break;
284 err = sock_intr_errno(timeo);
285 if (signal_pending(current))
286 break;
287 err = -EAGAIN;
288 if (!timeo)
289 break;
290 }
291 finish_wait(sk_sleep(sk), &wait);
292 return err;
293}
294
295
296
297
298struct sock *inet_csk_accept(struct sock *sk, int flags, int *err)
299{
300 struct inet_connection_sock *icsk = inet_csk(sk);
301 struct request_sock_queue *queue = &icsk->icsk_accept_queue;
302 struct request_sock *req;
303 struct sock *newsk;
304 int error;
305
306 lock_sock(sk);
307
308
309
310
311 error = -EINVAL;
312 if (sk->sk_state != TCP_LISTEN)
313 goto out_err;
314
315
316 if (reqsk_queue_empty(queue)) {
317 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
318
319
320 error = -EAGAIN;
321 if (!timeo)
322 goto out_err;
323
324 error = inet_csk_wait_for_connect(sk, timeo);
325 if (error)
326 goto out_err;
327 }
328 req = reqsk_queue_remove(queue, sk);
329 newsk = req->sk;
330
331 if (sk->sk_protocol == IPPROTO_TCP &&
332 tcp_rsk(req)->tfo_listener) {
333 spin_lock_bh(&queue->fastopenq.lock);
334 if (tcp_rsk(req)->tfo_listener) {
335
336
337
338
339
340
341 req->sk = NULL;
342 req = NULL;
343 }
344 spin_unlock_bh(&queue->fastopenq.lock);
345 }
346out:
347 release_sock(sk);
348 if (req)
349 reqsk_put(req);
350 return newsk;
351out_err:
352 newsk = NULL;
353 req = NULL;
354 *err = error;
355 goto out;
356}
357EXPORT_SYMBOL(inet_csk_accept);
358
359
360
361
362
363
364void inet_csk_init_xmit_timers(struct sock *sk,
365 void (*retransmit_handler)(unsigned long),
366 void (*delack_handler)(unsigned long),
367 void (*keepalive_handler)(unsigned long))
368{
369 struct inet_connection_sock *icsk = inet_csk(sk);
370
371 setup_timer(&icsk->icsk_retransmit_timer, retransmit_handler,
372 (unsigned long)sk);
373 setup_timer(&icsk->icsk_delack_timer, delack_handler,
374 (unsigned long)sk);
375 setup_timer(&sk->sk_timer, keepalive_handler, (unsigned long)sk);
376 icsk->icsk_pending = icsk->icsk_ack.pending = 0;
377}
378EXPORT_SYMBOL(inet_csk_init_xmit_timers);
379
380void inet_csk_clear_xmit_timers(struct sock *sk)
381{
382 struct inet_connection_sock *icsk = inet_csk(sk);
383
384 icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0;
385
386 sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
387 sk_stop_timer(sk, &icsk->icsk_delack_timer);
388 sk_stop_timer(sk, &sk->sk_timer);
389}
390EXPORT_SYMBOL(inet_csk_clear_xmit_timers);
391
392void inet_csk_delete_keepalive_timer(struct sock *sk)
393{
394 sk_stop_timer(sk, &sk->sk_timer);
395}
396EXPORT_SYMBOL(inet_csk_delete_keepalive_timer);
397
398void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len)
399{
400 sk_reset_timer(sk, &sk->sk_timer, jiffies + len);
401}
402EXPORT_SYMBOL(inet_csk_reset_keepalive_timer);
403
404struct dst_entry *inet_csk_route_req(const struct sock *sk,
405 struct flowi4 *fl4,
406 const struct request_sock *req)
407{
408 const struct inet_request_sock *ireq = inet_rsk(req);
409 struct net *net = read_pnet(&ireq->ireq_net);
410 struct ip_options_rcu *opt = ireq->opt;
411 struct rtable *rt;
412
413 flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark,
414 RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE,
415 sk->sk_protocol, inet_sk_flowi_flags(sk),
416 (opt && opt->opt.srr) ? opt->opt.faddr : ireq->ir_rmt_addr,
417 ireq->ir_loc_addr, ireq->ir_rmt_port,
418 htons(ireq->ir_num));
419 security_req_classify_flow(req, flowi4_to_flowi(fl4));
420 rt = ip_route_output_flow(net, fl4, sk);
421 if (IS_ERR(rt))
422 goto no_route;
423 if (opt && opt->opt.is_strictroute && rt->rt_uses_gateway)
424 goto route_err;
425 return &rt->dst;
426
427route_err:
428 ip_rt_put(rt);
429no_route:
430 __IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
431 return NULL;
432}
433EXPORT_SYMBOL_GPL(inet_csk_route_req);
434
435struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
436 struct sock *newsk,
437 const struct request_sock *req)
438{
439 const struct inet_request_sock *ireq = inet_rsk(req);
440 struct net *net = read_pnet(&ireq->ireq_net);
441 struct inet_sock *newinet = inet_sk(newsk);
442 struct ip_options_rcu *opt;
443 struct flowi4 *fl4;
444 struct rtable *rt;
445
446 fl4 = &newinet->cork.fl.u.ip4;
447
448 rcu_read_lock();
449 opt = rcu_dereference(newinet->inet_opt);
450 flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark,
451 RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE,
452 sk->sk_protocol, inet_sk_flowi_flags(sk),
453 (opt && opt->opt.srr) ? opt->opt.faddr : ireq->ir_rmt_addr,
454 ireq->ir_loc_addr, ireq->ir_rmt_port,
455 htons(ireq->ir_num));
456 security_req_classify_flow(req, flowi4_to_flowi(fl4));
457 rt = ip_route_output_flow(net, fl4, sk);
458 if (IS_ERR(rt))
459 goto no_route;
460 if (opt && opt->opt.is_strictroute && rt->rt_uses_gateway)
461 goto route_err;
462 rcu_read_unlock();
463 return &rt->dst;
464
465route_err:
466 ip_rt_put(rt);
467no_route:
468 rcu_read_unlock();
469 __IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
470 return NULL;
471}
472EXPORT_SYMBOL_GPL(inet_csk_route_child_sock);
473
474#if IS_ENABLED(CONFIG_IPV6)
475#define AF_INET_FAMILY(fam) ((fam) == AF_INET)
476#else
477#define AF_INET_FAMILY(fam) true
478#endif
479
480
481static inline void syn_ack_recalc(struct request_sock *req, const int thresh,
482 const int max_retries,
483 const u8 rskq_defer_accept,
484 int *expire, int *resend)
485{
486 if (!rskq_defer_accept) {
487 *expire = req->num_timeout >= thresh;
488 *resend = 1;
489 return;
490 }
491 *expire = req->num_timeout >= thresh &&
492 (!inet_rsk(req)->acked || req->num_timeout >= max_retries);
493
494
495
496
497
498 *resend = !inet_rsk(req)->acked ||
499 req->num_timeout >= rskq_defer_accept - 1;
500}
501
502int inet_rtx_syn_ack(const struct sock *parent, struct request_sock *req)
503{
504 int err = req->rsk_ops->rtx_syn_ack(parent, req);
505
506 if (!err)
507 req->num_retrans++;
508 return err;
509}
510EXPORT_SYMBOL(inet_rtx_syn_ack);
511
512
513static bool reqsk_queue_unlink(struct request_sock_queue *queue,
514 struct request_sock *req)
515{
516 struct inet_hashinfo *hashinfo = req_to_sk(req)->sk_prot->h.hashinfo;
517 bool found = false;
518
519 if (sk_hashed(req_to_sk(req))) {
520 spinlock_t *lock = inet_ehash_lockp(hashinfo, req->rsk_hash);
521
522 spin_lock(lock);
523 found = __sk_nulls_del_node_init_rcu(req_to_sk(req));
524 spin_unlock(lock);
525 }
526 if (timer_pending(&req->rsk_timer) && del_timer_sync(&req->rsk_timer))
527 reqsk_put(req);
528 return found;
529}
530
531void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req)
532{
533 if (reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req)) {
534 reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req);
535 reqsk_put(req);
536 }
537}
538EXPORT_SYMBOL(inet_csk_reqsk_queue_drop);
539
540void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req)
541{
542 inet_csk_reqsk_queue_drop(sk, req);
543 reqsk_put(req);
544}
545EXPORT_SYMBOL(inet_csk_reqsk_queue_drop_and_put);
546
547static void reqsk_timer_handler(unsigned long data)
548{
549 struct request_sock *req = (struct request_sock *)data;
550 struct sock *sk_listener = req->rsk_listener;
551 struct net *net = sock_net(sk_listener);
552 struct inet_connection_sock *icsk = inet_csk(sk_listener);
553 struct request_sock_queue *queue = &icsk->icsk_accept_queue;
554 int qlen, expire = 0, resend = 0;
555 int max_retries, thresh;
556 u8 defer_accept;
557
558 if (sk_state_load(sk_listener) != TCP_LISTEN)
559 goto drop;
560
561 max_retries = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_synack_retries;
562 thresh = max_retries;
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580 qlen = reqsk_queue_len(queue);
581 if ((qlen << 1) > max(8U, sk_listener->sk_max_ack_backlog)) {
582 int young = reqsk_queue_len_young(queue) << 1;
583
584 while (thresh > 2) {
585 if (qlen < young)
586 break;
587 thresh--;
588 young <<= 1;
589 }
590 }
591 defer_accept = READ_ONCE(queue->rskq_defer_accept);
592 if (defer_accept)
593 max_retries = defer_accept;
594 syn_ack_recalc(req, thresh, max_retries, defer_accept,
595 &expire, &resend);
596 req->rsk_ops->syn_ack_timeout(req);
597 if (!expire &&
598 (!resend ||
599 !inet_rtx_syn_ack(sk_listener, req) ||
600 inet_rsk(req)->acked)) {
601 unsigned long timeo;
602
603 if (req->num_timeout++ == 0)
604 atomic_dec(&queue->young);
605 timeo = min(TCP_TIMEOUT_INIT << req->num_timeout, TCP_RTO_MAX);
606 mod_timer(&req->rsk_timer, jiffies + timeo);
607 return;
608 }
609drop:
610 inet_csk_reqsk_queue_drop_and_put(sk_listener, req);
611}
612
613static void reqsk_queue_hash_req(struct request_sock *req,
614 unsigned long timeout)
615{
616 req->num_retrans = 0;
617 req->num_timeout = 0;
618 req->sk = NULL;
619
620 setup_pinned_timer(&req->rsk_timer, reqsk_timer_handler,
621 (unsigned long)req);
622 mod_timer(&req->rsk_timer, jiffies + timeout);
623
624 inet_ehash_insert(req_to_sk(req), NULL);
625
626
627
628 smp_wmb();
629 atomic_set(&req->rsk_refcnt, 2 + 1);
630}
631
632void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
633 unsigned long timeout)
634{
635 reqsk_queue_hash_req(req, timeout);
636 inet_csk_reqsk_queue_added(sk);
637}
638EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
639
640
641
642
643
644
645
646
647
648struct sock *inet_csk_clone_lock(const struct sock *sk,
649 const struct request_sock *req,
650 const gfp_t priority)
651{
652 struct sock *newsk = sk_clone_lock(sk, priority);
653
654 if (newsk) {
655 struct inet_connection_sock *newicsk = inet_csk(newsk);
656
657 newsk->sk_state = TCP_SYN_RECV;
658 newicsk->icsk_bind_hash = NULL;
659
660 inet_sk(newsk)->inet_dport = inet_rsk(req)->ir_rmt_port;
661 inet_sk(newsk)->inet_num = inet_rsk(req)->ir_num;
662 inet_sk(newsk)->inet_sport = htons(inet_rsk(req)->ir_num);
663 newsk->sk_write_space = sk_stream_write_space;
664
665
666 sock_reset_flag(newsk, SOCK_RCU_FREE);
667
668 newsk->sk_mark = inet_rsk(req)->ir_mark;
669 atomic64_set(&newsk->sk_cookie,
670 atomic64_read(&inet_rsk(req)->ir_cookie));
671
672 newicsk->icsk_retransmits = 0;
673 newicsk->icsk_backoff = 0;
674 newicsk->icsk_probes_out = 0;
675
676
677 memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue));
678
679 security_inet_csk_clone(newsk, req);
680 }
681 return newsk;
682}
683EXPORT_SYMBOL_GPL(inet_csk_clone_lock);
684
685
686
687
688
689
690
691void inet_csk_destroy_sock(struct sock *sk)
692{
693 WARN_ON(sk->sk_state != TCP_CLOSE);
694 WARN_ON(!sock_flag(sk, SOCK_DEAD));
695
696
697 WARN_ON(!sk_unhashed(sk));
698
699
700 WARN_ON(inet_sk(sk)->inet_num && !inet_csk(sk)->icsk_bind_hash);
701
702 sk->sk_prot->destroy(sk);
703
704 sk_stream_kill_queues(sk);
705
706 xfrm_sk_free_policy(sk);
707
708 sk_refcnt_debug_release(sk);
709
710 local_bh_disable();
711 percpu_counter_dec(sk->sk_prot->orphan_count);
712 local_bh_enable();
713 sock_put(sk);
714}
715EXPORT_SYMBOL(inet_csk_destroy_sock);
716
717
718
719
720void inet_csk_prepare_forced_close(struct sock *sk)
721 __releases(&sk->sk_lock.slock)
722{
723
724 bh_unlock_sock(sk);
725 sock_put(sk);
726
727
728 sock_set_flag(sk, SOCK_DEAD);
729 percpu_counter_inc(sk->sk_prot->orphan_count);
730 inet_sk(sk)->inet_num = 0;
731}
732EXPORT_SYMBOL(inet_csk_prepare_forced_close);
733
734int inet_csk_listen_start(struct sock *sk, int backlog)
735{
736 struct inet_connection_sock *icsk = inet_csk(sk);
737 struct inet_sock *inet = inet_sk(sk);
738 int err = -EADDRINUSE;
739
740 reqsk_queue_alloc(&icsk->icsk_accept_queue);
741
742 sk->sk_max_ack_backlog = backlog;
743 sk->sk_ack_backlog = 0;
744 inet_csk_delack_init(sk);
745
746
747
748
749
750
751 sk_state_store(sk, TCP_LISTEN);
752 if (!sk->sk_prot->get_port(sk, inet->inet_num)) {
753 inet->inet_sport = htons(inet->inet_num);
754
755 sk_dst_reset(sk);
756 err = sk->sk_prot->hash(sk);
757
758 if (likely(!err))
759 return 0;
760 }
761
762 sk->sk_state = TCP_CLOSE;
763 return err;
764}
765EXPORT_SYMBOL_GPL(inet_csk_listen_start);
766
767static void inet_child_forget(struct sock *sk, struct request_sock *req,
768 struct sock *child)
769{
770 sk->sk_prot->disconnect(child, O_NONBLOCK);
771
772 sock_orphan(child);
773
774 percpu_counter_inc(sk->sk_prot->orphan_count);
775
776 if (sk->sk_protocol == IPPROTO_TCP && tcp_rsk(req)->tfo_listener) {
777 BUG_ON(tcp_sk(child)->fastopen_rsk != req);
778 BUG_ON(sk != req->rsk_listener);
779
780
781
782
783
784
785
786 tcp_sk(child)->fastopen_rsk = NULL;
787 }
788 inet_csk_destroy_sock(child);
789 reqsk_put(req);
790}
791
792struct sock *inet_csk_reqsk_queue_add(struct sock *sk,
793 struct request_sock *req,
794 struct sock *child)
795{
796 struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue;
797
798 spin_lock(&queue->rskq_lock);
799 if (unlikely(sk->sk_state != TCP_LISTEN)) {
800 inet_child_forget(sk, req, child);
801 child = NULL;
802 } else {
803 req->sk = child;
804 req->dl_next = NULL;
805 if (queue->rskq_accept_head == NULL)
806 queue->rskq_accept_head = req;
807 else
808 queue->rskq_accept_tail->dl_next = req;
809 queue->rskq_accept_tail = req;
810 sk_acceptq_added(sk);
811 }
812 spin_unlock(&queue->rskq_lock);
813 return child;
814}
815EXPORT_SYMBOL(inet_csk_reqsk_queue_add);
816
817struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,
818 struct request_sock *req, bool own_req)
819{
820 if (own_req) {
821 inet_csk_reqsk_queue_drop(sk, req);
822 reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req);
823 if (inet_csk_reqsk_queue_add(sk, req, child))
824 return child;
825 }
826
827 bh_unlock_sock(child);
828 sock_put(child);
829 return NULL;
830}
831EXPORT_SYMBOL(inet_csk_complete_hashdance);
832
833
834
835
836
837void inet_csk_listen_stop(struct sock *sk)
838{
839 struct inet_connection_sock *icsk = inet_csk(sk);
840 struct request_sock_queue *queue = &icsk->icsk_accept_queue;
841 struct request_sock *next, *req;
842
843
844
845
846
847
848
849
850
851 while ((req = reqsk_queue_remove(queue, sk)) != NULL) {
852 struct sock *child = req->sk;
853
854 local_bh_disable();
855 bh_lock_sock(child);
856 WARN_ON(sock_owned_by_user(child));
857 sock_hold(child);
858
859 inet_child_forget(sk, req, child);
860 bh_unlock_sock(child);
861 local_bh_enable();
862 sock_put(child);
863
864 cond_resched();
865 }
866 if (queue->fastopenq.rskq_rst_head) {
867
868 spin_lock_bh(&queue->fastopenq.lock);
869 req = queue->fastopenq.rskq_rst_head;
870 queue->fastopenq.rskq_rst_head = NULL;
871 spin_unlock_bh(&queue->fastopenq.lock);
872 while (req != NULL) {
873 next = req->dl_next;
874 reqsk_put(req);
875 req = next;
876 }
877 }
878 WARN_ON_ONCE(sk->sk_ack_backlog);
879}
880EXPORT_SYMBOL_GPL(inet_csk_listen_stop);
881
882void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
883{
884 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
885 const struct inet_sock *inet = inet_sk(sk);
886
887 sin->sin_family = AF_INET;
888 sin->sin_addr.s_addr = inet->inet_daddr;
889 sin->sin_port = inet->inet_dport;
890}
891EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr);
892
893#ifdef CONFIG_COMPAT
894int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
895 char __user *optval, int __user *optlen)
896{
897 const struct inet_connection_sock *icsk = inet_csk(sk);
898
899 if (icsk->icsk_af_ops->compat_getsockopt)
900 return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname,
901 optval, optlen);
902 return icsk->icsk_af_ops->getsockopt(sk, level, optname,
903 optval, optlen);
904}
905EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt);
906
907int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
908 char __user *optval, unsigned int optlen)
909{
910 const struct inet_connection_sock *icsk = inet_csk(sk);
911
912 if (icsk->icsk_af_ops->compat_setsockopt)
913 return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname,
914 optval, optlen);
915 return icsk->icsk_af_ops->setsockopt(sk, level, optname,
916 optval, optlen);
917}
918EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt);
919#endif
920
921static struct dst_entry *inet_csk_rebuild_route(struct sock *sk, struct flowi *fl)
922{
923 const struct inet_sock *inet = inet_sk(sk);
924 const struct ip_options_rcu *inet_opt;
925 __be32 daddr = inet->inet_daddr;
926 struct flowi4 *fl4;
927 struct rtable *rt;
928
929 rcu_read_lock();
930 inet_opt = rcu_dereference(inet->inet_opt);
931 if (inet_opt && inet_opt->opt.srr)
932 daddr = inet_opt->opt.faddr;
933 fl4 = &fl->u.ip4;
934 rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr,
935 inet->inet_saddr, inet->inet_dport,
936 inet->inet_sport, sk->sk_protocol,
937 RT_CONN_FLAGS(sk), sk->sk_bound_dev_if);
938 if (IS_ERR(rt))
939 rt = NULL;
940 if (rt)
941 sk_setup_caps(sk, &rt->dst);
942 rcu_read_unlock();
943
944 return &rt->dst;
945}
946
947struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu)
948{
949 struct dst_entry *dst = __sk_dst_check(sk, 0);
950 struct inet_sock *inet = inet_sk(sk);
951
952 if (!dst) {
953 dst = inet_csk_rebuild_route(sk, &inet->cork.fl);
954 if (!dst)
955 goto out;
956 }
957 dst->ops->update_pmtu(dst, sk, NULL, mtu);
958
959 dst = __sk_dst_check(sk, 0);
960 if (!dst)
961 dst = inet_csk_rebuild_route(sk, &inet->cork.fl);
962out:
963 return dst;
964}
965EXPORT_SYMBOL_GPL(inet_csk_update_pmtu);
966