Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-or-later
2 : /*
3 : * INET An implementation of the TCP/IP protocol suite for the LINUX
4 : * operating system. INET is implemented using the BSD Socket
5 : * interface as the means of communication with the user level.
6 : *
7 : * Support for INET connection oriented protocols.
8 : *
9 : * Authors: See the TCP sources
10 : */
11 :
12 : #include <linux/module.h>
13 : #include <linux/jhash.h>
14 :
15 : #include <net/inet_connection_sock.h>
16 : #include <net/inet_hashtables.h>
17 : #include <net/inet_timewait_sock.h>
18 : #include <net/ip.h>
19 : #include <net/route.h>
20 : #include <net/tcp_states.h>
21 : #include <net/xfrm.h>
22 : #include <net/tcp.h>
23 : #include <net/sock_reuseport.h>
24 : #include <net/addrconf.h>
25 :
26 : #if IS_ENABLED(CONFIG_IPV6)
27 : /* match_sk*_wildcard == true: IPV6_ADDR_ANY equals to any IPv6 addresses
28 : * if IPv6 only, and any IPv4 addresses
29 : * if not IPv6 only
30 : * match_sk*_wildcard == false: addresses must be exactly the same, i.e.
31 : * IPV6_ADDR_ANY only equals to IPV6_ADDR_ANY,
32 : * and 0.0.0.0 equals to 0.0.0.0 only
33 : */
34 : static bool ipv6_rcv_saddr_equal(const struct in6_addr *sk1_rcv_saddr6,
35 : const struct in6_addr *sk2_rcv_saddr6,
36 : __be32 sk1_rcv_saddr, __be32 sk2_rcv_saddr,
37 : bool sk1_ipv6only, bool sk2_ipv6only,
38 : bool match_sk1_wildcard,
39 : bool match_sk2_wildcard)
40 : {
41 : int addr_type = ipv6_addr_type(sk1_rcv_saddr6);
42 : int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
43 :
44 : /* if both are mapped, treat as IPv4 */
45 : if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) {
46 : if (!sk2_ipv6only) {
47 : if (sk1_rcv_saddr == sk2_rcv_saddr)
48 : return true;
49 : return (match_sk1_wildcard && !sk1_rcv_saddr) ||
50 : (match_sk2_wildcard && !sk2_rcv_saddr);
51 : }
52 : return false;
53 : }
54 :
55 : if (addr_type == IPV6_ADDR_ANY && addr_type2 == IPV6_ADDR_ANY)
56 : return true;
57 :
58 : if (addr_type2 == IPV6_ADDR_ANY && match_sk2_wildcard &&
59 : !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
60 : return true;
61 :
62 : if (addr_type == IPV6_ADDR_ANY && match_sk1_wildcard &&
63 : !(sk1_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
64 : return true;
65 :
66 : if (sk2_rcv_saddr6 &&
67 : ipv6_addr_equal(sk1_rcv_saddr6, sk2_rcv_saddr6))
68 : return true;
69 :
70 : return false;
71 : }
72 : #endif
73 :
74 : /* match_sk*_wildcard == true: 0.0.0.0 equals to any IPv4 addresses
75 : * match_sk*_wildcard == false: addresses must be exactly the same, i.e.
76 : * 0.0.0.0 only equals to 0.0.0.0
77 : */
78 0 : static bool ipv4_rcv_saddr_equal(__be32 sk1_rcv_saddr, __be32 sk2_rcv_saddr,
79 : bool sk2_ipv6only, bool match_sk1_wildcard,
80 : bool match_sk2_wildcard)
81 : {
82 0 : if (!sk2_ipv6only) {
83 0 : if (sk1_rcv_saddr == sk2_rcv_saddr)
84 : return true;
85 0 : return (match_sk1_wildcard && !sk1_rcv_saddr) ||
86 0 : (match_sk2_wildcard && !sk2_rcv_saddr);
87 : }
88 : return false;
89 : }
90 :
91 0 : bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
92 : bool match_wildcard)
93 : {
94 : #if IS_ENABLED(CONFIG_IPV6)
95 : if (sk->sk_family == AF_INET6)
96 : return ipv6_rcv_saddr_equal(&sk->sk_v6_rcv_saddr,
97 : inet6_rcv_saddr(sk2),
98 : sk->sk_rcv_saddr,
99 : sk2->sk_rcv_saddr,
100 : ipv6_only_sock(sk),
101 : ipv6_only_sock(sk2),
102 : match_wildcard,
103 : match_wildcard);
104 : #endif
105 0 : return ipv4_rcv_saddr_equal(sk->sk_rcv_saddr, sk2->sk_rcv_saddr,
106 : ipv6_only_sock(sk2), match_wildcard,
107 : match_wildcard);
108 : }
109 : EXPORT_SYMBOL(inet_rcv_saddr_equal);
110 :
111 0 : bool inet_rcv_saddr_any(const struct sock *sk)
112 : {
113 : #if IS_ENABLED(CONFIG_IPV6)
114 : if (sk->sk_family == AF_INET6)
115 : return ipv6_addr_any(&sk->sk_v6_rcv_saddr);
116 : #endif
117 0 : return !sk->sk_rcv_saddr;
118 : }
119 :
120 33 : void inet_get_local_port_range(struct net *net, int *low, int *high)
121 : {
122 33 : unsigned int seq;
123 :
124 33 : do {
125 33 : seq = read_seqbegin(&net->ipv4.ip_local_ports.lock);
126 :
127 33 : *low = net->ipv4.ip_local_ports.range[0];
128 33 : *high = net->ipv4.ip_local_ports.range[1];
129 33 : } while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq));
130 33 : }
131 : EXPORT_SYMBOL(inet_get_local_port_range);
132 :
133 3 : static int inet_csk_bind_conflict(const struct sock *sk,
134 : const struct inet_bind_bucket *tb,
135 : bool relax, bool reuseport_ok)
136 : {
137 3 : struct sock *sk2;
138 3 : bool reuse = sk->sk_reuse;
139 3 : bool reuseport = !!sk->sk_reuseport;
140 3 : kuid_t uid = sock_i_uid((struct sock *)sk);
141 :
142 : /*
143 : * Unlike other sk lookup places we do not check
144 : * for sk_net here, since _all_ the socks listed
145 : * in tb->owners list belong to the same net - the
146 : * one this bucket belongs to.
147 : */
148 :
149 9 : sk_for_each_bound(sk2, &tb->owners) {
150 3 : if (sk != sk2 &&
151 0 : (!sk->sk_bound_dev_if ||
152 0 : !sk2->sk_bound_dev_if ||
153 : sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
154 0 : if (reuse && sk2->sk_reuse &&
155 0 : sk2->sk_state != TCP_LISTEN) {
156 0 : if ((!relax ||
157 0 : (!reuseport_ok &&
158 0 : reuseport && sk2->sk_reuseport &&
159 0 : !rcu_access_pointer(sk->sk_reuseport_cb) &&
160 0 : (sk2->sk_state == TCP_TIME_WAIT ||
161 0 : uid_eq(uid, sock_i_uid(sk2))))) &&
162 0 : inet_rcv_saddr_equal(sk, sk2, true))
163 : break;
164 0 : } else if (!reuseport_ok ||
165 0 : !reuseport || !sk2->sk_reuseport ||
166 0 : rcu_access_pointer(sk->sk_reuseport_cb) ||
167 0 : (sk2->sk_state != TCP_TIME_WAIT &&
168 0 : !uid_eq(uid, sock_i_uid(sk2)))) {
169 0 : if (inet_rcv_saddr_equal(sk, sk2, true))
170 : break;
171 : }
172 : }
173 : }
174 3 : return sk2 != NULL;
175 : }
176 :
177 : /*
178 : * Find an open port number for the socket. Returns with the
179 : * inet_bind_hashbucket lock held.
180 : */
181 : static struct inet_bind_hashbucket *
182 0 : inet_csk_find_open_port(struct sock *sk, struct inet_bind_bucket **tb_ret, int *port_ret)
183 : {
184 0 : struct inet_hashinfo *hinfo = sk->sk_prot->h.hashinfo;
185 0 : int port = 0;
186 0 : struct inet_bind_hashbucket *head;
187 0 : struct net *net = sock_net(sk);
188 0 : bool relax = false;
189 0 : int i, low, high, attempt_half;
190 0 : struct inet_bind_bucket *tb;
191 0 : u32 remaining, offset;
192 0 : int l3mdev;
193 :
194 0 : l3mdev = inet_sk_bound_l3mdev(sk);
195 0 : ports_exhausted:
196 0 : attempt_half = (sk->sk_reuse == SK_CAN_REUSE) ? 1 : 0;
197 0 : other_half_scan:
198 0 : inet_get_local_port_range(net, &low, &high);
199 0 : high++; /* [32768, 60999] -> [32768, 61000[ */
200 0 : if (high - low < 4)
201 : attempt_half = 0;
202 0 : if (attempt_half) {
203 0 : int half = low + (((high - low) >> 2) << 1);
204 :
205 0 : if (attempt_half == 1)
206 0 : high = half;
207 : else
208 0 : low = half;
209 : }
210 0 : remaining = high - low;
211 0 : if (likely(remaining > 1))
212 0 : remaining &= ~1U;
213 :
214 0 : offset = prandom_u32() % remaining;
215 : /* __inet_hash_connect() favors ports having @low parity
216 : * We do the opposite to not pollute connect() users.
217 : */
218 0 : offset |= 1U;
219 :
220 0 : other_parity_scan:
221 0 : port = low + offset;
222 0 : for (i = 0; i < remaining; i += 2, port += 2) {
223 0 : if (unlikely(port >= high))
224 0 : port -= remaining;
225 0 : if (inet_is_local_reserved_port(net, port))
226 0 : continue;
227 0 : head = &hinfo->bhash[inet_bhashfn(net, port,
228 : hinfo->bhash_size)];
229 0 : spin_lock_bh(&head->lock);
230 0 : inet_bind_bucket_for_each(tb, &head->chain)
231 0 : if (net_eq(ib_net(tb), net) && tb->l3mdev == l3mdev &&
232 0 : tb->port == port) {
233 0 : if (!inet_csk_bind_conflict(sk, tb, relax, false))
234 0 : goto success;
235 0 : goto next_port;
236 : }
237 0 : tb = NULL;
238 0 : goto success;
239 0 : next_port:
240 0 : spin_unlock_bh(&head->lock);
241 0 : cond_resched();
242 : }
243 :
244 0 : offset--;
245 0 : if (!(offset & 1))
246 0 : goto other_parity_scan;
247 :
248 0 : if (attempt_half == 1) {
249 : /* OK we now try the upper half of the range */
250 0 : attempt_half = 2;
251 0 : goto other_half_scan;
252 : }
253 :
254 0 : if (net->ipv4.sysctl_ip_autobind_reuse && !relax) {
255 : /* We still have a chance to connect to different destinations */
256 0 : relax = true;
257 0 : goto ports_exhausted;
258 : }
259 : return NULL;
260 0 : success:
261 0 : *port_ret = port;
262 0 : *tb_ret = tb;
263 0 : return head;
264 : }
265 :
266 3 : static inline int sk_reuseport_match(struct inet_bind_bucket *tb,
267 : struct sock *sk)
268 : {
269 3 : kuid_t uid = sock_i_uid(sk);
270 :
271 3 : if (tb->fastreuseport <= 0)
272 : return 0;
273 0 : if (!sk->sk_reuseport)
274 : return 0;
275 0 : if (rcu_access_pointer(sk->sk_reuseport_cb))
276 : return 0;
277 0 : if (!uid_eq(tb->fastuid, uid))
278 : return 0;
279 : /* We only need to check the rcv_saddr if this tb was once marked
280 : * without fastreuseport and then was reset, as we can only know that
281 : * the fast_*rcv_saddr doesn't have any conflicts with the socks on the
282 : * owners list.
283 : */
284 0 : if (tb->fastreuseport == FASTREUSEPORT_ANY)
285 : return 1;
286 : #if IS_ENABLED(CONFIG_IPV6)
287 : if (tb->fast_sk_family == AF_INET6)
288 : return ipv6_rcv_saddr_equal(&tb->fast_v6_rcv_saddr,
289 : inet6_rcv_saddr(sk),
290 : tb->fast_rcv_saddr,
291 : sk->sk_rcv_saddr,
292 : tb->fast_ipv6_only,
293 : ipv6_only_sock(sk), true, false);
294 : #endif
295 0 : return ipv4_rcv_saddr_equal(tb->fast_rcv_saddr, sk->sk_rcv_saddr,
296 : ipv6_only_sock(sk), true, false);
297 : }
298 :
299 6 : void inet_csk_update_fastreuse(struct inet_bind_bucket *tb,
300 : struct sock *sk)
301 : {
302 6 : kuid_t uid = sock_i_uid(sk);
303 6 : bool reuse = sk->sk_reuse && sk->sk_state != TCP_LISTEN;
304 :
305 6 : if (hlist_empty(&tb->owners)) {
306 3 : tb->fastreuse = reuse;
307 3 : if (sk->sk_reuseport) {
308 0 : tb->fastreuseport = FASTREUSEPORT_ANY;
309 0 : tb->fastuid = uid;
310 0 : tb->fast_rcv_saddr = sk->sk_rcv_saddr;
311 0 : tb->fast_ipv6_only = ipv6_only_sock(sk);
312 0 : tb->fast_sk_family = sk->sk_family;
313 : #if IS_ENABLED(CONFIG_IPV6)
314 : tb->fast_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
315 : #endif
316 : } else {
317 3 : tb->fastreuseport = 0;
318 : }
319 : } else {
320 3 : if (!reuse)
321 3 : tb->fastreuse = 0;
322 3 : if (sk->sk_reuseport) {
323 : /* We didn't match or we don't have fastreuseport set on
324 : * the tb, but we have sk_reuseport set on this socket
325 : * and we know that there are no bind conflicts with
326 : * this socket in this tb, so reset our tb's reuseport
327 : * settings so that any subsequent sockets that match
328 : * our current socket will be put on the fast path.
329 : *
330 : * If we reset we need to set FASTREUSEPORT_STRICT so we
331 : * do extra checking for all subsequent sk_reuseport
332 : * socks.
333 : */
334 0 : if (!sk_reuseport_match(tb, sk)) {
335 0 : tb->fastreuseport = FASTREUSEPORT_STRICT;
336 0 : tb->fastuid = uid;
337 0 : tb->fast_rcv_saddr = sk->sk_rcv_saddr;
338 0 : tb->fast_ipv6_only = ipv6_only_sock(sk);
339 0 : tb->fast_sk_family = sk->sk_family;
340 : #if IS_ENABLED(CONFIG_IPV6)
341 : tb->fast_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
342 : #endif
343 : }
344 : } else {
345 3 : tb->fastreuseport = 0;
346 : }
347 : }
348 6 : }
349 :
350 : /* Obtain a reference to a local port for the given sock,
351 : * if snum is zero it means select any available local port.
352 : * We try to allocate an odd port (and leave even ports for connect())
353 : */
354 6 : int inet_csk_get_port(struct sock *sk, unsigned short snum)
355 : {
356 6 : bool reuse = sk->sk_reuse && sk->sk_state != TCP_LISTEN;
357 6 : struct inet_hashinfo *hinfo = sk->sk_prot->h.hashinfo;
358 6 : int ret = 1, port = snum;
359 6 : struct inet_bind_hashbucket *head;
360 6 : struct net *net = sock_net(sk);
361 6 : struct inet_bind_bucket *tb = NULL;
362 6 : int l3mdev;
363 :
364 6 : l3mdev = inet_sk_bound_l3mdev(sk);
365 :
366 6 : if (!port) {
367 0 : head = inet_csk_find_open_port(sk, &tb, &port);
368 0 : if (!head)
369 : return ret;
370 0 : if (!tb)
371 0 : goto tb_not_found;
372 0 : goto success;
373 : }
374 6 : head = &hinfo->bhash[inet_bhashfn(net, port,
375 : hinfo->bhash_size)];
376 6 : spin_lock_bh(&head->lock);
377 6 : inet_bind_bucket_for_each(tb, &head->chain)
378 3 : if (net_eq(ib_net(tb), net) && tb->l3mdev == l3mdev &&
379 3 : tb->port == port)
380 3 : goto tb_found;
381 3 : tb_not_found:
382 3 : tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
383 : net, head, port, l3mdev);
384 3 : if (!tb)
385 0 : goto fail_unlock;
386 3 : tb_found:
387 6 : if (!hlist_empty(&tb->owners)) {
388 3 : if (sk->sk_reuse == SK_FORCE_REUSE)
389 0 : goto success;
390 :
391 6 : if ((tb->fastreuse > 0 && reuse) ||
392 3 : sk_reuseport_match(tb, sk))
393 0 : goto success;
394 3 : if (inet_csk_bind_conflict(sk, tb, true, true))
395 0 : goto fail_unlock;
396 : }
397 6 : success:
398 6 : inet_csk_update_fastreuse(tb, sk);
399 :
400 6 : if (!inet_csk(sk)->icsk_bind_hash)
401 3 : inet_bind_hash(sk, tb, port);
402 6 : WARN_ON(inet_csk(sk)->icsk_bind_hash != tb);
403 : ret = 0;
404 :
405 6 : fail_unlock:
406 6 : spin_unlock_bh(&head->lock);
407 6 : return ret;
408 : }
409 : EXPORT_SYMBOL_GPL(inet_csk_get_port);
410 :
411 : /*
412 : * Wait for an incoming connection, avoid race conditions. This must be called
413 : * with the socket locked.
414 : */
415 0 : static int inet_csk_wait_for_connect(struct sock *sk, long timeo)
416 : {
417 0 : struct inet_connection_sock *icsk = inet_csk(sk);
418 0 : DEFINE_WAIT(wait);
419 0 : int err;
420 :
421 : /*
422 : * True wake-one mechanism for incoming connections: only
423 : * one process gets woken up, not the 'whole herd'.
424 : * Since we do not 'race & poll' for established sockets
425 : * anymore, the common case will execute the loop only once.
426 : *
427 : * Subtle issue: "add_wait_queue_exclusive()" will be added
428 : * after any current non-exclusive waiters, and we know that
429 : * it will always _stay_ after any new non-exclusive waiters
430 : * because all non-exclusive waiters are added at the
431 : * beginning of the wait-queue. As such, it's ok to "drop"
432 : * our exclusiveness temporarily when we get woken up without
433 : * having to remove and re-insert us on the wait queue.
434 : */
435 0 : for (;;) {
436 0 : prepare_to_wait_exclusive(sk_sleep(sk), &wait,
437 : TASK_INTERRUPTIBLE);
438 0 : release_sock(sk);
439 0 : if (reqsk_queue_empty(&icsk->icsk_accept_queue))
440 0 : timeo = schedule_timeout(timeo);
441 0 : sched_annotate_sleep();
442 0 : lock_sock(sk);
443 0 : err = 0;
444 0 : if (!reqsk_queue_empty(&icsk->icsk_accept_queue))
445 : break;
446 0 : err = -EINVAL;
447 0 : if (sk->sk_state != TCP_LISTEN)
448 : break;
449 0 : err = sock_intr_errno(timeo);
450 0 : if (signal_pending(current))
451 : break;
452 0 : err = -EAGAIN;
453 0 : if (!timeo)
454 : break;
455 : }
456 0 : finish_wait(sk_sleep(sk), &wait);
457 0 : return err;
458 : }
459 :
460 : /*
461 : * This will accept the next outstanding connection.
462 : */
463 4 : struct sock *inet_csk_accept(struct sock *sk, int flags, int *err, bool kern)
464 : {
465 4 : struct inet_connection_sock *icsk = inet_csk(sk);
466 4 : struct request_sock_queue *queue = &icsk->icsk_accept_queue;
467 4 : struct request_sock *req;
468 4 : struct sock *newsk;
469 4 : int error;
470 :
471 4 : lock_sock(sk);
472 :
473 : /* We need to make sure that this socket is listening,
474 : * and that it has something pending.
475 : */
476 4 : error = -EINVAL;
477 4 : if (sk->sk_state != TCP_LISTEN)
478 0 : goto out_err;
479 :
480 : /* Find already established connection */
481 4 : if (reqsk_queue_empty(queue)) {
482 0 : long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
483 :
484 : /* If this is a non blocking socket don't sleep */
485 0 : error = -EAGAIN;
486 0 : if (!timeo)
487 0 : goto out_err;
488 :
489 0 : error = inet_csk_wait_for_connect(sk, timeo);
490 0 : if (error)
491 0 : goto out_err;
492 : }
493 4 : req = reqsk_queue_remove(queue, sk);
494 4 : newsk = req->sk;
495 :
496 4 : if (sk->sk_protocol == IPPROTO_TCP &&
497 4 : tcp_rsk(req)->tfo_listener) {
498 0 : spin_lock_bh(&queue->fastopenq.lock);
499 0 : if (tcp_rsk(req)->tfo_listener) {
500 : /* We are still waiting for the final ACK from 3WHS
501 : * so can't free req now. Instead, we set req->sk to
502 : * NULL to signify that the child socket is taken
503 : * so reqsk_fastopen_remove() will free the req
504 : * when 3WHS finishes (or is aborted).
505 : */
506 0 : req->sk = NULL;
507 0 : req = NULL;
508 : }
509 0 : spin_unlock_bh(&queue->fastopenq.lock);
510 : }
511 :
512 4 : out:
513 4 : release_sock(sk);
514 4 : if (newsk && mem_cgroup_sockets_enabled) {
515 : int amt;
516 :
517 : /* atomically get the memory usage, set and charge the
518 : * newsk->sk_memcg.
519 : */
520 : lock_sock(newsk);
521 :
522 : /* The socket has not been accepted yet, no need to look at
523 : * newsk->sk_wmem_queued.
524 : */
525 : amt = sk_mem_pages(newsk->sk_forward_alloc +
526 : atomic_read(&newsk->sk_rmem_alloc));
527 : mem_cgroup_sk_alloc(newsk);
528 : if (newsk->sk_memcg && amt)
529 : mem_cgroup_charge_skmem(newsk->sk_memcg, amt);
530 :
531 : release_sock(newsk);
532 : }
533 4 : if (req)
534 4 : reqsk_put(req);
535 4 : return newsk;
536 0 : out_err:
537 0 : newsk = NULL;
538 0 : req = NULL;
539 0 : *err = error;
540 0 : goto out;
541 : }
542 : EXPORT_SYMBOL(inet_csk_accept);
543 :
544 : /*
545 : * Using different timers for retransmit, delayed acks and probes
546 : * We may wish use just one timer maintaining a list of expire jiffies
547 : * to optimize.
548 : */
549 7 : void inet_csk_init_xmit_timers(struct sock *sk,
550 : void (*retransmit_handler)(struct timer_list *t),
551 : void (*delack_handler)(struct timer_list *t),
552 : void (*keepalive_handler)(struct timer_list *t))
553 : {
554 7 : struct inet_connection_sock *icsk = inet_csk(sk);
555 :
556 7 : timer_setup(&icsk->icsk_retransmit_timer, retransmit_handler, 0);
557 7 : timer_setup(&icsk->icsk_delack_timer, delack_handler, 0);
558 7 : timer_setup(&sk->sk_timer, keepalive_handler, 0);
559 7 : icsk->icsk_pending = icsk->icsk_ack.pending = 0;
560 7 : }
561 : EXPORT_SYMBOL(inet_csk_init_xmit_timers);
562 :
563 7 : void inet_csk_clear_xmit_timers(struct sock *sk)
564 : {
565 7 : struct inet_connection_sock *icsk = inet_csk(sk);
566 :
567 7 : icsk->icsk_pending = icsk->icsk_ack.pending = 0;
568 :
569 7 : sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
570 7 : sk_stop_timer(sk, &icsk->icsk_delack_timer);
571 7 : sk_stop_timer(sk, &sk->sk_timer);
572 7 : }
573 : EXPORT_SYMBOL(inet_csk_clear_xmit_timers);
574 :
575 0 : void inet_csk_delete_keepalive_timer(struct sock *sk)
576 : {
577 0 : sk_stop_timer(sk, &sk->sk_timer);
578 0 : }
579 : EXPORT_SYMBOL(inet_csk_delete_keepalive_timer);
580 :
581 4 : void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len)
582 : {
583 4 : sk_reset_timer(sk, &sk->sk_timer, jiffies + len);
584 4 : }
585 : EXPORT_SYMBOL(inet_csk_reset_keepalive_timer);
586 :
587 4 : struct dst_entry *inet_csk_route_req(const struct sock *sk,
588 : struct flowi4 *fl4,
589 : const struct request_sock *req)
590 : {
591 4 : const struct inet_request_sock *ireq = inet_rsk(req);
592 4 : struct net *net = read_pnet(&ireq->ireq_net);
593 4 : struct ip_options_rcu *opt;
594 4 : struct rtable *rt;
595 :
596 4 : rcu_read_lock();
597 4 : opt = rcu_dereference(ireq->ireq_opt);
598 :
599 4 : flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark,
600 4 : RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE,
601 4 : sk->sk_protocol, inet_sk_flowi_flags(sk),
602 0 : (opt && opt->opt.srr) ? opt->opt.faddr : ireq->ir_rmt_addr,
603 4 : ireq->ir_loc_addr, ireq->ir_rmt_port,
604 4 : htons(ireq->ir_num), sk->sk_uid);
605 4 : security_req_classify_flow(req, flowi4_to_flowi_common(fl4));
606 4 : rt = ip_route_output_flow(net, fl4, sk);
607 4 : if (IS_ERR(rt))
608 0 : goto no_route;
609 4 : if (opt && opt->opt.is_strictroute && rt->rt_uses_gateway)
610 0 : goto route_err;
611 4 : rcu_read_unlock();
612 4 : return &rt->dst;
613 :
614 0 : route_err:
615 0 : ip_rt_put(rt);
616 0 : no_route:
617 0 : rcu_read_unlock();
618 0 : __IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
619 0 : return NULL;
620 : }
621 : EXPORT_SYMBOL_GPL(inet_csk_route_req);
622 :
623 4 : struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
624 : struct sock *newsk,
625 : const struct request_sock *req)
626 : {
627 4 : const struct inet_request_sock *ireq = inet_rsk(req);
628 4 : struct net *net = read_pnet(&ireq->ireq_net);
629 4 : struct inet_sock *newinet = inet_sk(newsk);
630 4 : struct ip_options_rcu *opt;
631 4 : struct flowi4 *fl4;
632 4 : struct rtable *rt;
633 :
634 4 : opt = rcu_dereference(ireq->ireq_opt);
635 4 : fl4 = &newinet->cork.fl.u.ip4;
636 :
637 4 : flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark,
638 4 : RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE,
639 4 : sk->sk_protocol, inet_sk_flowi_flags(sk),
640 0 : (opt && opt->opt.srr) ? opt->opt.faddr : ireq->ir_rmt_addr,
641 4 : ireq->ir_loc_addr, ireq->ir_rmt_port,
642 4 : htons(ireq->ir_num), sk->sk_uid);
643 4 : security_req_classify_flow(req, flowi4_to_flowi_common(fl4));
644 4 : rt = ip_route_output_flow(net, fl4, sk);
645 4 : if (IS_ERR(rt))
646 0 : goto no_route;
647 4 : if (opt && opt->opt.is_strictroute && rt->rt_uses_gateway)
648 0 : goto route_err;
649 4 : return &rt->dst;
650 :
651 0 : route_err:
652 0 : ip_rt_put(rt);
653 0 : no_route:
654 0 : __IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
655 0 : return NULL;
656 : }
657 : EXPORT_SYMBOL_GPL(inet_csk_route_child_sock);
658 :
659 : /* Decide when to expire the request and when to resend SYN-ACK */
660 0 : static void syn_ack_recalc(struct request_sock *req,
661 : const int max_syn_ack_retries,
662 : const u8 rskq_defer_accept,
663 : int *expire, int *resend)
664 : {
665 0 : if (!rskq_defer_accept) {
666 0 : *expire = req->num_timeout >= max_syn_ack_retries;
667 0 : *resend = 1;
668 0 : return;
669 : }
670 0 : *expire = req->num_timeout >= max_syn_ack_retries &&
671 0 : (!inet_rsk(req)->acked || req->num_timeout >= rskq_defer_accept);
672 : /* Do not resend while waiting for data after ACK,
673 : * start to resend on end of deferring period to give
674 : * last chance for data or ACK to create established socket.
675 : */
676 0 : *resend = !inet_rsk(req)->acked ||
677 0 : req->num_timeout >= rskq_defer_accept - 1;
678 : }
679 :
680 0 : int inet_rtx_syn_ack(const struct sock *parent, struct request_sock *req)
681 : {
682 0 : int err = req->rsk_ops->rtx_syn_ack(parent, req);
683 :
684 0 : if (!err)
685 0 : req->num_retrans++;
686 0 : return err;
687 : }
688 : EXPORT_SYMBOL(inet_rtx_syn_ack);
689 :
690 : /* return true if req was found in the ehash table */
691 4 : static bool reqsk_queue_unlink(struct request_sock *req)
692 : {
693 4 : struct inet_hashinfo *hashinfo = req_to_sk(req)->sk_prot->h.hashinfo;
694 4 : bool found = false;
695 :
696 4 : if (sk_hashed(req_to_sk(req))) {
697 0 : spinlock_t *lock = inet_ehash_lockp(hashinfo, req->rsk_hash);
698 :
699 0 : spin_lock(lock);
700 0 : found = __sk_nulls_del_node_init_rcu(req_to_sk(req));
701 0 : spin_unlock(lock);
702 : }
703 4 : if (timer_pending(&req->rsk_timer) && del_timer_sync(&req->rsk_timer))
704 4 : reqsk_put(req);
705 4 : return found;
706 : }
707 :
708 4 : void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req)
709 : {
710 4 : if (reqsk_queue_unlink(req)) {
711 0 : reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req);
712 0 : reqsk_put(req);
713 : }
714 4 : }
715 : EXPORT_SYMBOL(inet_csk_reqsk_queue_drop);
716 :
717 0 : void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req)
718 : {
719 0 : inet_csk_reqsk_queue_drop(sk, req);
720 0 : reqsk_put(req);
721 0 : }
722 : EXPORT_SYMBOL(inet_csk_reqsk_queue_drop_and_put);
723 :
724 0 : static void reqsk_timer_handler(struct timer_list *t)
725 : {
726 0 : struct request_sock *req = from_timer(req, t, rsk_timer);
727 0 : struct sock *sk_listener = req->rsk_listener;
728 0 : struct net *net = sock_net(sk_listener);
729 0 : struct inet_connection_sock *icsk = inet_csk(sk_listener);
730 0 : struct request_sock_queue *queue = &icsk->icsk_accept_queue;
731 0 : int max_syn_ack_retries, qlen, expire = 0, resend = 0;
732 :
733 0 : if (inet_sk_state_load(sk_listener) != TCP_LISTEN)
734 0 : goto drop;
735 :
736 0 : max_syn_ack_retries = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_synack_retries;
737 : /* Normally all the openreqs are young and become mature
738 : * (i.e. converted to established socket) for first timeout.
739 : * If synack was not acknowledged for 1 second, it means
740 : * one of the following things: synack was lost, ack was lost,
741 : * rtt is high or nobody planned to ack (i.e. synflood).
742 : * When server is a bit loaded, queue is populated with old
743 : * open requests, reducing effective size of queue.
744 : * When server is well loaded, queue size reduces to zero
745 : * after several minutes of work. It is not synflood,
746 : * it is normal operation. The solution is pruning
747 : * too old entries overriding normal timeout, when
748 : * situation becomes dangerous.
749 : *
750 : * Essentially, we reserve half of room for young
751 : * embrions; and abort old ones without pity, if old
752 : * ones are about to clog our table.
753 : */
754 0 : qlen = reqsk_queue_len(queue);
755 0 : if ((qlen << 1) > max(8U, READ_ONCE(sk_listener->sk_max_ack_backlog))) {
756 0 : int young = reqsk_queue_len_young(queue) << 1;
757 :
758 0 : while (max_syn_ack_retries > 2) {
759 0 : if (qlen < young)
760 : break;
761 0 : max_syn_ack_retries--;
762 0 : young <<= 1;
763 : }
764 : }
765 0 : syn_ack_recalc(req, max_syn_ack_retries, READ_ONCE(queue->rskq_defer_accept),
766 : &expire, &resend);
767 0 : req->rsk_ops->syn_ack_timeout(req);
768 0 : if (!expire &&
769 0 : (!resend ||
770 0 : !inet_rtx_syn_ack(sk_listener, req) ||
771 0 : inet_rsk(req)->acked)) {
772 0 : unsigned long timeo;
773 :
774 0 : if (req->num_timeout++ == 0)
775 0 : atomic_dec(&queue->young);
776 0 : timeo = min(TCP_TIMEOUT_INIT << req->num_timeout, TCP_RTO_MAX);
777 0 : mod_timer(&req->rsk_timer, jiffies + timeo);
778 0 : return;
779 : }
780 0 : drop:
781 0 : inet_csk_reqsk_queue_drop_and_put(sk_listener, req);
782 : }
783 :
784 4 : static void reqsk_queue_hash_req(struct request_sock *req,
785 : unsigned long timeout)
786 : {
787 4 : timer_setup(&req->rsk_timer, reqsk_timer_handler, TIMER_PINNED);
788 4 : mod_timer(&req->rsk_timer, jiffies + timeout);
789 :
790 4 : inet_ehash_insert(req_to_sk(req), NULL, NULL);
791 : /* before letting lookups find us, make sure all req fields
792 : * are committed to memory and refcnt initialized.
793 : */
794 4 : smp_wmb();
795 4 : refcount_set(&req->rsk_refcnt, 2 + 1);
796 4 : }
797 :
798 4 : void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
799 : unsigned long timeout)
800 : {
801 4 : reqsk_queue_hash_req(req, timeout);
802 4 : inet_csk_reqsk_queue_added(sk);
803 4 : }
804 : EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
805 :
806 4 : static void inet_clone_ulp(const struct request_sock *req, struct sock *newsk,
807 : const gfp_t priority)
808 : {
809 4 : struct inet_connection_sock *icsk = inet_csk(newsk);
810 :
811 4 : if (!icsk->icsk_ulp_ops)
812 : return;
813 :
814 0 : if (icsk->icsk_ulp_ops->clone)
815 0 : icsk->icsk_ulp_ops->clone(req, newsk, priority);
816 : }
817 :
818 : /**
819 : * inet_csk_clone_lock - clone an inet socket, and lock its clone
820 : * @sk: the socket to clone
821 : * @req: request_sock
822 : * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
823 : *
824 : * Caller must unlock socket even in error path (bh_unlock_sock(newsk))
825 : */
826 4 : struct sock *inet_csk_clone_lock(const struct sock *sk,
827 : const struct request_sock *req,
828 : const gfp_t priority)
829 : {
830 4 : struct sock *newsk = sk_clone_lock(sk, priority);
831 :
832 4 : if (newsk) {
833 4 : struct inet_connection_sock *newicsk = inet_csk(newsk);
834 :
835 4 : inet_sk_set_state(newsk, TCP_SYN_RECV);
836 4 : newicsk->icsk_bind_hash = NULL;
837 :
838 4 : inet_sk(newsk)->inet_dport = inet_rsk(req)->ir_rmt_port;
839 4 : inet_sk(newsk)->inet_num = inet_rsk(req)->ir_num;
840 4 : inet_sk(newsk)->inet_sport = htons(inet_rsk(req)->ir_num);
841 :
842 : /* listeners have SOCK_RCU_FREE, not the children */
843 4 : sock_reset_flag(newsk, SOCK_RCU_FREE);
844 :
845 4 : inet_sk(newsk)->mc_list = NULL;
846 :
847 4 : newsk->sk_mark = inet_rsk(req)->ir_mark;
848 4 : atomic64_set(&newsk->sk_cookie,
849 4 : atomic64_read(&inet_rsk(req)->ir_cookie));
850 :
851 4 : newicsk->icsk_retransmits = 0;
852 4 : newicsk->icsk_backoff = 0;
853 4 : newicsk->icsk_probes_out = 0;
854 4 : newicsk->icsk_probes_tstamp = 0;
855 :
856 : /* Deinitialize accept_queue to trap illegal accesses. */
857 4 : memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue));
858 :
859 4 : inet_clone_ulp(req, newsk, priority);
860 :
861 4 : security_inet_csk_clone(newsk, req);
862 : }
863 4 : return newsk;
864 : }
865 : EXPORT_SYMBOL_GPL(inet_csk_clone_lock);
866 :
867 : /*
868 : * At this point, there should be no process reference to this
869 : * socket, and thus no user references at all. Therefore we
870 : * can assume the socket waitqueue is inactive and nobody will
871 : * try to jump onto it.
872 : */
873 4 : void inet_csk_destroy_sock(struct sock *sk)
874 : {
875 4 : WARN_ON(sk->sk_state != TCP_CLOSE);
876 4 : WARN_ON(!sock_flag(sk, SOCK_DEAD));
877 :
878 : /* It cannot be in hash table! */
879 4 : WARN_ON(!sk_unhashed(sk));
880 :
881 : /* If it has not 0 inet_sk(sk)->inet_num, it must be bound */
882 5 : WARN_ON(inet_sk(sk)->inet_num && !inet_csk(sk)->icsk_bind_hash);
883 :
884 4 : sk->sk_prot->destroy(sk);
885 :
886 4 : sk_stream_kill_queues(sk);
887 :
888 4 : xfrm_sk_free_policy(sk);
889 :
890 4 : sk_refcnt_debug_release(sk);
891 :
892 4 : percpu_counter_dec(sk->sk_prot->orphan_count);
893 :
894 4 : sock_put(sk);
895 4 : }
896 : EXPORT_SYMBOL(inet_csk_destroy_sock);
897 :
898 : /* This function allows to force a closure of a socket after the call to
899 : * tcp/dccp_create_openreq_child().
900 : */
901 0 : void inet_csk_prepare_forced_close(struct sock *sk)
902 : __releases(&sk->sk_lock.slock)
903 : {
904 : /* sk_clone_lock locked the socket and set refcnt to 2 */
905 0 : bh_unlock_sock(sk);
906 0 : sock_put(sk);
907 0 : inet_csk_prepare_for_destroy_sock(sk);
908 0 : inet_sk(sk)->inet_num = 0;
909 0 : }
910 : EXPORT_SYMBOL(inet_csk_prepare_forced_close);
911 :
912 3 : int inet_csk_listen_start(struct sock *sk, int backlog)
913 : {
914 3 : struct inet_connection_sock *icsk = inet_csk(sk);
915 3 : struct inet_sock *inet = inet_sk(sk);
916 3 : int err = -EADDRINUSE;
917 :
918 3 : reqsk_queue_alloc(&icsk->icsk_accept_queue);
919 :
920 3 : sk->sk_ack_backlog = 0;
921 3 : inet_csk_delack_init(sk);
922 :
923 : /* There is race window here: we announce ourselves listening,
924 : * but this transition is still not validated by get_port().
925 : * It is OK, because this socket enters to hash table only
926 : * after validation is complete.
927 : */
928 3 : inet_sk_state_store(sk, TCP_LISTEN);
929 3 : if (!sk->sk_prot->get_port(sk, inet->inet_num)) {
930 3 : inet->inet_sport = htons(inet->inet_num);
931 :
932 3 : sk_dst_reset(sk);
933 3 : err = sk->sk_prot->hash(sk);
934 :
935 3 : if (likely(!err))
936 : return 0;
937 : }
938 :
939 0 : inet_sk_set_state(sk, TCP_CLOSE);
940 0 : return err;
941 : }
942 : EXPORT_SYMBOL_GPL(inet_csk_listen_start);
943 :
944 0 : static void inet_child_forget(struct sock *sk, struct request_sock *req,
945 : struct sock *child)
946 : {
947 0 : sk->sk_prot->disconnect(child, O_NONBLOCK);
948 :
949 0 : sock_orphan(child);
950 :
951 0 : percpu_counter_inc(sk->sk_prot->orphan_count);
952 :
953 0 : if (sk->sk_protocol == IPPROTO_TCP && tcp_rsk(req)->tfo_listener) {
954 0 : BUG_ON(rcu_access_pointer(tcp_sk(child)->fastopen_rsk) != req);
955 0 : BUG_ON(sk != req->rsk_listener);
956 :
957 : /* Paranoid, to prevent race condition if
958 : * an inbound pkt destined for child is
959 : * blocked by sock lock in tcp_v4_rcv().
960 : * Also to satisfy an assertion in
961 : * tcp_v4_destroy_sock().
962 : */
963 0 : RCU_INIT_POINTER(tcp_sk(child)->fastopen_rsk, NULL);
964 : }
965 0 : inet_csk_destroy_sock(child);
966 0 : }
967 :
968 4 : struct sock *inet_csk_reqsk_queue_add(struct sock *sk,
969 : struct request_sock *req,
970 : struct sock *child)
971 : {
972 4 : struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue;
973 :
974 4 : spin_lock(&queue->rskq_lock);
975 4 : if (unlikely(sk->sk_state != TCP_LISTEN)) {
976 0 : inet_child_forget(sk, req, child);
977 0 : child = NULL;
978 : } else {
979 4 : req->sk = child;
980 4 : req->dl_next = NULL;
981 4 : if (queue->rskq_accept_head == NULL)
982 4 : WRITE_ONCE(queue->rskq_accept_head, req);
983 : else
984 0 : queue->rskq_accept_tail->dl_next = req;
985 4 : queue->rskq_accept_tail = req;
986 4 : sk_acceptq_added(sk);
987 : }
988 4 : spin_unlock(&queue->rskq_lock);
989 4 : return child;
990 : }
991 : EXPORT_SYMBOL(inet_csk_reqsk_queue_add);
992 :
993 4 : struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,
994 : struct request_sock *req, bool own_req)
995 : {
996 4 : if (own_req) {
997 4 : inet_csk_reqsk_queue_drop(sk, req);
998 4 : reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req);
999 4 : if (inet_csk_reqsk_queue_add(sk, req, child))
1000 : return child;
1001 : }
1002 : /* Too bad, another child took ownership of the request, undo. */
1003 0 : bh_unlock_sock(child);
1004 0 : sock_put(child);
1005 0 : return NULL;
1006 : }
1007 : EXPORT_SYMBOL(inet_csk_complete_hashdance);
1008 :
1009 : /*
1010 : * This routine closes sockets which have been at least partially
1011 : * opened, but not yet accepted.
1012 : */
1013 1 : void inet_csk_listen_stop(struct sock *sk)
1014 : {
1015 1 : struct inet_connection_sock *icsk = inet_csk(sk);
1016 1 : struct request_sock_queue *queue = &icsk->icsk_accept_queue;
1017 1 : struct request_sock *next, *req;
1018 :
1019 : /* Following specs, it would be better either to send FIN
1020 : * (and enter FIN-WAIT-1, it is normal close)
1021 : * or to send active reset (abort).
1022 : * Certainly, it is pretty dangerous while synflood, but it is
1023 : * bad justification for our negligence 8)
1024 : * To be honest, we are not able to make either
1025 : * of the variants now. --ANK
1026 : */
1027 1 : while ((req = reqsk_queue_remove(queue, sk)) != NULL) {
1028 0 : struct sock *child = req->sk;
1029 :
1030 0 : local_bh_disable();
1031 0 : bh_lock_sock(child);
1032 0 : WARN_ON(sock_owned_by_user(child));
1033 0 : sock_hold(child);
1034 :
1035 0 : inet_child_forget(sk, req, child);
1036 0 : reqsk_put(req);
1037 0 : bh_unlock_sock(child);
1038 0 : local_bh_enable();
1039 0 : sock_put(child);
1040 :
1041 0 : cond_resched();
1042 : }
1043 1 : if (queue->fastopenq.rskq_rst_head) {
1044 : /* Free all the reqs queued in rskq_rst_head. */
1045 0 : spin_lock_bh(&queue->fastopenq.lock);
1046 0 : req = queue->fastopenq.rskq_rst_head;
1047 0 : queue->fastopenq.rskq_rst_head = NULL;
1048 0 : spin_unlock_bh(&queue->fastopenq.lock);
1049 0 : while (req != NULL) {
1050 0 : next = req->dl_next;
1051 0 : reqsk_put(req);
1052 0 : req = next;
1053 : }
1054 : }
1055 1 : WARN_ON_ONCE(sk->sk_ack_backlog);
1056 1 : }
1057 : EXPORT_SYMBOL_GPL(inet_csk_listen_stop);
1058 :
1059 0 : void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
1060 : {
1061 0 : struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
1062 0 : const struct inet_sock *inet = inet_sk(sk);
1063 :
1064 0 : sin->sin_family = AF_INET;
1065 0 : sin->sin_addr.s_addr = inet->inet_daddr;
1066 0 : sin->sin_port = inet->inet_dport;
1067 0 : }
1068 : EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr);
1069 :
1070 0 : static struct dst_entry *inet_csk_rebuild_route(struct sock *sk, struct flowi *fl)
1071 : {
1072 0 : const struct inet_sock *inet = inet_sk(sk);
1073 0 : const struct ip_options_rcu *inet_opt;
1074 0 : __be32 daddr = inet->inet_daddr;
1075 0 : struct flowi4 *fl4;
1076 0 : struct rtable *rt;
1077 :
1078 0 : rcu_read_lock();
1079 0 : inet_opt = rcu_dereference(inet->inet_opt);
1080 0 : if (inet_opt && inet_opt->opt.srr)
1081 0 : daddr = inet_opt->opt.faddr;
1082 0 : fl4 = &fl->u.ip4;
1083 0 : rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr,
1084 0 : inet->inet_saddr, inet->inet_dport,
1085 0 : inet->inet_sport, sk->sk_protocol,
1086 0 : RT_CONN_FLAGS(sk), sk->sk_bound_dev_if);
1087 0 : if (IS_ERR(rt))
1088 : rt = NULL;
1089 0 : if (rt)
1090 0 : sk_setup_caps(sk, &rt->dst);
1091 0 : rcu_read_unlock();
1092 :
1093 0 : return &rt->dst;
1094 : }
1095 :
1096 0 : struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu)
1097 : {
1098 0 : struct dst_entry *dst = __sk_dst_check(sk, 0);
1099 0 : struct inet_sock *inet = inet_sk(sk);
1100 :
1101 0 : if (!dst) {
1102 0 : dst = inet_csk_rebuild_route(sk, &inet->cork.fl);
1103 0 : if (!dst)
1104 0 : goto out;
1105 : }
1106 0 : dst->ops->update_pmtu(dst, sk, NULL, mtu, true);
1107 :
1108 0 : dst = __sk_dst_check(sk, 0);
1109 0 : if (!dst)
1110 0 : dst = inet_csk_rebuild_route(sk, &inet->cork.fl);
1111 0 : out:
1112 0 : return dst;
1113 : }
1114 : EXPORT_SYMBOL_GPL(inet_csk_update_pmtu);
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