Loading...
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 * Generic INET transport hashtables
7 *
8 * Authors: Lotsa people, from code originally in tcp
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/random.h>
18#include <linux/sched.h>
19#include <linux/slab.h>
20#include <linux/wait.h>
21
22#include <net/inet_connection_sock.h>
23#include <net/inet_hashtables.h>
24#include <net/secure_seq.h>
25#include <net/ip.h>
26
27static unsigned int inet_ehashfn(struct net *net, const __be32 laddr,
28 const __u16 lport, const __be32 faddr,
29 const __be16 fport)
30{
31 static u32 inet_ehash_secret __read_mostly;
32
33 net_get_random_once(&inet_ehash_secret, sizeof(inet_ehash_secret));
34
35 return __inet_ehashfn(laddr, lport, faddr, fport,
36 inet_ehash_secret + net_hash_mix(net));
37}
38
39
40static unsigned int inet_sk_ehashfn(const struct sock *sk)
41{
42 const struct inet_sock *inet = inet_sk(sk);
43 const __be32 laddr = inet->inet_rcv_saddr;
44 const __u16 lport = inet->inet_num;
45 const __be32 faddr = inet->inet_daddr;
46 const __be16 fport = inet->inet_dport;
47 struct net *net = sock_net(sk);
48
49 return inet_ehashfn(net, laddr, lport, faddr, fport);
50}
51
52/*
53 * Allocate and initialize a new local port bind bucket.
54 * The bindhash mutex for snum's hash chain must be held here.
55 */
56struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
57 struct net *net,
58 struct inet_bind_hashbucket *head,
59 const unsigned short snum)
60{
61 struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
62
63 if (tb != NULL) {
64 write_pnet(&tb->ib_net, hold_net(net));
65 tb->port = snum;
66 tb->fastreuse = 0;
67 tb->fastreuseport = 0;
68 tb->num_owners = 0;
69 INIT_HLIST_HEAD(&tb->owners);
70 hlist_add_head(&tb->node, &head->chain);
71 }
72 return tb;
73}
74
75/*
76 * Caller must hold hashbucket lock for this tb with local BH disabled
77 */
78void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb)
79{
80 if (hlist_empty(&tb->owners)) {
81 __hlist_del(&tb->node);
82 release_net(ib_net(tb));
83 kmem_cache_free(cachep, tb);
84 }
85}
86
87void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
88 const unsigned short snum)
89{
90 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
91
92 atomic_inc(&hashinfo->bsockets);
93
94 inet_sk(sk)->inet_num = snum;
95 sk_add_bind_node(sk, &tb->owners);
96 tb->num_owners++;
97 inet_csk(sk)->icsk_bind_hash = tb;
98}
99
100/*
101 * Get rid of any references to a local port held by the given sock.
102 */
103static void __inet_put_port(struct sock *sk)
104{
105 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
106 const int bhash = inet_bhashfn(sock_net(sk), inet_sk(sk)->inet_num,
107 hashinfo->bhash_size);
108 struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash];
109 struct inet_bind_bucket *tb;
110
111 atomic_dec(&hashinfo->bsockets);
112
113 spin_lock(&head->lock);
114 tb = inet_csk(sk)->icsk_bind_hash;
115 __sk_del_bind_node(sk);
116 tb->num_owners--;
117 inet_csk(sk)->icsk_bind_hash = NULL;
118 inet_sk(sk)->inet_num = 0;
119 inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
120 spin_unlock(&head->lock);
121}
122
123void inet_put_port(struct sock *sk)
124{
125 local_bh_disable();
126 __inet_put_port(sk);
127 local_bh_enable();
128}
129EXPORT_SYMBOL(inet_put_port);
130
131int __inet_inherit_port(struct sock *sk, struct sock *child)
132{
133 struct inet_hashinfo *table = sk->sk_prot->h.hashinfo;
134 unsigned short port = inet_sk(child)->inet_num;
135 const int bhash = inet_bhashfn(sock_net(sk), port,
136 table->bhash_size);
137 struct inet_bind_hashbucket *head = &table->bhash[bhash];
138 struct inet_bind_bucket *tb;
139
140 spin_lock(&head->lock);
141 tb = inet_csk(sk)->icsk_bind_hash;
142 if (tb->port != port) {
143 /* NOTE: using tproxy and redirecting skbs to a proxy
144 * on a different listener port breaks the assumption
145 * that the listener socket's icsk_bind_hash is the same
146 * as that of the child socket. We have to look up or
147 * create a new bind bucket for the child here. */
148 inet_bind_bucket_for_each(tb, &head->chain) {
149 if (net_eq(ib_net(tb), sock_net(sk)) &&
150 tb->port == port)
151 break;
152 }
153 if (!tb) {
154 tb = inet_bind_bucket_create(table->bind_bucket_cachep,
155 sock_net(sk), head, port);
156 if (!tb) {
157 spin_unlock(&head->lock);
158 return -ENOMEM;
159 }
160 }
161 }
162 inet_bind_hash(child, tb, port);
163 spin_unlock(&head->lock);
164
165 return 0;
166}
167EXPORT_SYMBOL_GPL(__inet_inherit_port);
168
169static inline int compute_score(struct sock *sk, struct net *net,
170 const unsigned short hnum, const __be32 daddr,
171 const int dif)
172{
173 int score = -1;
174 struct inet_sock *inet = inet_sk(sk);
175
176 if (net_eq(sock_net(sk), net) && inet->inet_num == hnum &&
177 !ipv6_only_sock(sk)) {
178 __be32 rcv_saddr = inet->inet_rcv_saddr;
179 score = sk->sk_family == PF_INET ? 2 : 1;
180 if (rcv_saddr) {
181 if (rcv_saddr != daddr)
182 return -1;
183 score += 4;
184 }
185 if (sk->sk_bound_dev_if) {
186 if (sk->sk_bound_dev_if != dif)
187 return -1;
188 score += 4;
189 }
190 }
191 return score;
192}
193
194/*
195 * Don't inline this cruft. Here are some nice properties to exploit here. The
196 * BSD API does not allow a listening sock to specify the remote port nor the
197 * remote address for the connection. So always assume those are both
198 * wildcarded during the search since they can never be otherwise.
199 */
200
201
202struct sock *__inet_lookup_listener(struct net *net,
203 struct inet_hashinfo *hashinfo,
204 const __be32 saddr, __be16 sport,
205 const __be32 daddr, const unsigned short hnum,
206 const int dif)
207{
208 struct sock *sk, *result;
209 struct hlist_nulls_node *node;
210 unsigned int hash = inet_lhashfn(net, hnum);
211 struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
212 int score, hiscore, matches = 0, reuseport = 0;
213 u32 phash = 0;
214
215 rcu_read_lock();
216begin:
217 result = NULL;
218 hiscore = 0;
219 sk_nulls_for_each_rcu(sk, node, &ilb->head) {
220 score = compute_score(sk, net, hnum, daddr, dif);
221 if (score > hiscore) {
222 result = sk;
223 hiscore = score;
224 reuseport = sk->sk_reuseport;
225 if (reuseport) {
226 phash = inet_ehashfn(net, daddr, hnum,
227 saddr, sport);
228 matches = 1;
229 }
230 } else if (score == hiscore && reuseport) {
231 matches++;
232 if (((u64)phash * matches) >> 32 == 0)
233 result = sk;
234 phash = next_pseudo_random32(phash);
235 }
236 }
237 /*
238 * if the nulls value we got at the end of this lookup is
239 * not the expected one, we must restart lookup.
240 * We probably met an item that was moved to another chain.
241 */
242 if (get_nulls_value(node) != hash + LISTENING_NULLS_BASE)
243 goto begin;
244 if (result) {
245 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
246 result = NULL;
247 else if (unlikely(compute_score(result, net, hnum, daddr,
248 dif) < hiscore)) {
249 sock_put(result);
250 goto begin;
251 }
252 }
253 rcu_read_unlock();
254 return result;
255}
256EXPORT_SYMBOL_GPL(__inet_lookup_listener);
257
258/* All sockets share common refcount, but have different destructors */
259void sock_gen_put(struct sock *sk)
260{
261 if (!atomic_dec_and_test(&sk->sk_refcnt))
262 return;
263
264 if (sk->sk_state == TCP_TIME_WAIT)
265 inet_twsk_free(inet_twsk(sk));
266 else
267 sk_free(sk);
268}
269EXPORT_SYMBOL_GPL(sock_gen_put);
270
271struct sock *__inet_lookup_established(struct net *net,
272 struct inet_hashinfo *hashinfo,
273 const __be32 saddr, const __be16 sport,
274 const __be32 daddr, const u16 hnum,
275 const int dif)
276{
277 INET_ADDR_COOKIE(acookie, saddr, daddr)
278 const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
279 struct sock *sk;
280 const struct hlist_nulls_node *node;
281 /* Optimize here for direct hit, only listening connections can
282 * have wildcards anyways.
283 */
284 unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport);
285 unsigned int slot = hash & hashinfo->ehash_mask;
286 struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
287
288 rcu_read_lock();
289begin:
290 sk_nulls_for_each_rcu(sk, node, &head->chain) {
291 if (sk->sk_hash != hash)
292 continue;
293 if (likely(INET_MATCH(sk, net, acookie,
294 saddr, daddr, ports, dif))) {
295 if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt)))
296 goto out;
297 if (unlikely(!INET_MATCH(sk, net, acookie,
298 saddr, daddr, ports, dif))) {
299 sock_gen_put(sk);
300 goto begin;
301 }
302 goto found;
303 }
304 }
305 /*
306 * if the nulls value we got at the end of this lookup is
307 * not the expected one, we must restart lookup.
308 * We probably met an item that was moved to another chain.
309 */
310 if (get_nulls_value(node) != slot)
311 goto begin;
312out:
313 sk = NULL;
314found:
315 rcu_read_unlock();
316 return sk;
317}
318EXPORT_SYMBOL_GPL(__inet_lookup_established);
319
320/* called with local bh disabled */
321static int __inet_check_established(struct inet_timewait_death_row *death_row,
322 struct sock *sk, __u16 lport,
323 struct inet_timewait_sock **twp)
324{
325 struct inet_hashinfo *hinfo = death_row->hashinfo;
326 struct inet_sock *inet = inet_sk(sk);
327 __be32 daddr = inet->inet_rcv_saddr;
328 __be32 saddr = inet->inet_daddr;
329 int dif = sk->sk_bound_dev_if;
330 INET_ADDR_COOKIE(acookie, saddr, daddr)
331 const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
332 struct net *net = sock_net(sk);
333 unsigned int hash = inet_ehashfn(net, daddr, lport,
334 saddr, inet->inet_dport);
335 struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
336 spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
337 struct sock *sk2;
338 const struct hlist_nulls_node *node;
339 struct inet_timewait_sock *tw = NULL;
340 int twrefcnt = 0;
341
342 spin_lock(lock);
343
344 sk_nulls_for_each(sk2, node, &head->chain) {
345 if (sk2->sk_hash != hash)
346 continue;
347
348 if (likely(INET_MATCH(sk2, net, acookie,
349 saddr, daddr, ports, dif))) {
350 if (sk2->sk_state == TCP_TIME_WAIT) {
351 tw = inet_twsk(sk2);
352 if (twsk_unique(sk, sk2, twp))
353 break;
354 }
355 goto not_unique;
356 }
357 }
358
359 /* Must record num and sport now. Otherwise we will see
360 * in hash table socket with a funny identity.
361 */
362 inet->inet_num = lport;
363 inet->inet_sport = htons(lport);
364 sk->sk_hash = hash;
365 WARN_ON(!sk_unhashed(sk));
366 __sk_nulls_add_node_rcu(sk, &head->chain);
367 if (tw) {
368 twrefcnt = inet_twsk_unhash(tw);
369 NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED);
370 }
371 spin_unlock(lock);
372 if (twrefcnt)
373 inet_twsk_put(tw);
374 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
375
376 if (twp) {
377 *twp = tw;
378 } else if (tw) {
379 /* Silly. Should hash-dance instead... */
380 inet_twsk_deschedule(tw, death_row);
381
382 inet_twsk_put(tw);
383 }
384 return 0;
385
386not_unique:
387 spin_unlock(lock);
388 return -EADDRNOTAVAIL;
389}
390
391static inline u32 inet_sk_port_offset(const struct sock *sk)
392{
393 const struct inet_sock *inet = inet_sk(sk);
394 return secure_ipv4_port_ephemeral(inet->inet_rcv_saddr,
395 inet->inet_daddr,
396 inet->inet_dport);
397}
398
399int __inet_hash_nolisten(struct sock *sk, struct inet_timewait_sock *tw)
400{
401 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
402 struct hlist_nulls_head *list;
403 spinlock_t *lock;
404 struct inet_ehash_bucket *head;
405 int twrefcnt = 0;
406
407 WARN_ON(!sk_unhashed(sk));
408
409 sk->sk_hash = inet_sk_ehashfn(sk);
410 head = inet_ehash_bucket(hashinfo, sk->sk_hash);
411 list = &head->chain;
412 lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
413
414 spin_lock(lock);
415 __sk_nulls_add_node_rcu(sk, list);
416 if (tw) {
417 WARN_ON(sk->sk_hash != tw->tw_hash);
418 twrefcnt = inet_twsk_unhash(tw);
419 }
420 spin_unlock(lock);
421 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
422 return twrefcnt;
423}
424EXPORT_SYMBOL_GPL(__inet_hash_nolisten);
425
426static void __inet_hash(struct sock *sk)
427{
428 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
429 struct inet_listen_hashbucket *ilb;
430
431 if (sk->sk_state != TCP_LISTEN) {
432 __inet_hash_nolisten(sk, NULL);
433 return;
434 }
435
436 WARN_ON(!sk_unhashed(sk));
437 ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
438
439 spin_lock(&ilb->lock);
440 __sk_nulls_add_node_rcu(sk, &ilb->head);
441 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
442 spin_unlock(&ilb->lock);
443}
444
445void inet_hash(struct sock *sk)
446{
447 if (sk->sk_state != TCP_CLOSE) {
448 local_bh_disable();
449 __inet_hash(sk);
450 local_bh_enable();
451 }
452}
453EXPORT_SYMBOL_GPL(inet_hash);
454
455void inet_unhash(struct sock *sk)
456{
457 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
458 spinlock_t *lock;
459 int done;
460
461 if (sk_unhashed(sk))
462 return;
463
464 if (sk->sk_state == TCP_LISTEN)
465 lock = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)].lock;
466 else
467 lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
468
469 spin_lock_bh(lock);
470 done = __sk_nulls_del_node_init_rcu(sk);
471 if (done)
472 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
473 spin_unlock_bh(lock);
474}
475EXPORT_SYMBOL_GPL(inet_unhash);
476
477int __inet_hash_connect(struct inet_timewait_death_row *death_row,
478 struct sock *sk, u32 port_offset,
479 int (*check_established)(struct inet_timewait_death_row *,
480 struct sock *, __u16, struct inet_timewait_sock **),
481 int (*hash)(struct sock *sk, struct inet_timewait_sock *twp))
482{
483 struct inet_hashinfo *hinfo = death_row->hashinfo;
484 const unsigned short snum = inet_sk(sk)->inet_num;
485 struct inet_bind_hashbucket *head;
486 struct inet_bind_bucket *tb;
487 int ret;
488 struct net *net = sock_net(sk);
489 int twrefcnt = 1;
490
491 if (!snum) {
492 int i, remaining, low, high, port;
493 static u32 hint;
494 u32 offset = hint + port_offset;
495 struct inet_timewait_sock *tw = NULL;
496
497 inet_get_local_port_range(net, &low, &high);
498 remaining = (high - low) + 1;
499
500 local_bh_disable();
501 for (i = 1; i <= remaining; i++) {
502 port = low + (i + offset) % remaining;
503 if (inet_is_reserved_local_port(port))
504 continue;
505 head = &hinfo->bhash[inet_bhashfn(net, port,
506 hinfo->bhash_size)];
507 spin_lock(&head->lock);
508
509 /* Does not bother with rcv_saddr checks,
510 * because the established check is already
511 * unique enough.
512 */
513 inet_bind_bucket_for_each(tb, &head->chain) {
514 if (net_eq(ib_net(tb), net) &&
515 tb->port == port) {
516 if (tb->fastreuse >= 0 ||
517 tb->fastreuseport >= 0)
518 goto next_port;
519 WARN_ON(hlist_empty(&tb->owners));
520 if (!check_established(death_row, sk,
521 port, &tw))
522 goto ok;
523 goto next_port;
524 }
525 }
526
527 tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
528 net, head, port);
529 if (!tb) {
530 spin_unlock(&head->lock);
531 break;
532 }
533 tb->fastreuse = -1;
534 tb->fastreuseport = -1;
535 goto ok;
536
537 next_port:
538 spin_unlock(&head->lock);
539 }
540 local_bh_enable();
541
542 return -EADDRNOTAVAIL;
543
544ok:
545 hint += i;
546
547 /* Head lock still held and bh's disabled */
548 inet_bind_hash(sk, tb, port);
549 if (sk_unhashed(sk)) {
550 inet_sk(sk)->inet_sport = htons(port);
551 twrefcnt += hash(sk, tw);
552 }
553 if (tw)
554 twrefcnt += inet_twsk_bind_unhash(tw, hinfo);
555 spin_unlock(&head->lock);
556
557 if (tw) {
558 inet_twsk_deschedule(tw, death_row);
559 while (twrefcnt) {
560 twrefcnt--;
561 inet_twsk_put(tw);
562 }
563 }
564
565 ret = 0;
566 goto out;
567 }
568
569 head = &hinfo->bhash[inet_bhashfn(net, snum, hinfo->bhash_size)];
570 tb = inet_csk(sk)->icsk_bind_hash;
571 spin_lock_bh(&head->lock);
572 if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) {
573 hash(sk, NULL);
574 spin_unlock_bh(&head->lock);
575 return 0;
576 } else {
577 spin_unlock(&head->lock);
578 /* No definite answer... Walk to established hash table */
579 ret = check_established(death_row, sk, snum, NULL);
580out:
581 local_bh_enable();
582 return ret;
583 }
584}
585
586/*
587 * Bind a port for a connect operation and hash it.
588 */
589int inet_hash_connect(struct inet_timewait_death_row *death_row,
590 struct sock *sk)
591{
592 return __inet_hash_connect(death_row, sk, inet_sk_port_offset(sk),
593 __inet_check_established, __inet_hash_nolisten);
594}
595EXPORT_SYMBOL_GPL(inet_hash_connect);
596
597void inet_hashinfo_init(struct inet_hashinfo *h)
598{
599 int i;
600
601 atomic_set(&h->bsockets, 0);
602 for (i = 0; i < INET_LHTABLE_SIZE; i++) {
603 spin_lock_init(&h->listening_hash[i].lock);
604 INIT_HLIST_NULLS_HEAD(&h->listening_hash[i].head,
605 i + LISTENING_NULLS_BASE);
606 }
607}
608EXPORT_SYMBOL_GPL(inet_hashinfo_init);
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 * Generic INET transport hashtables
7 *
8 * Authors: Lotsa people, from code originally in tcp
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/random.h>
18#include <linux/sched.h>
19#include <linux/slab.h>
20#include <linux/wait.h>
21#include <linux/vmalloc.h>
22#include <linux/bootmem.h>
23
24#include <net/addrconf.h>
25#include <net/inet_connection_sock.h>
26#include <net/inet_hashtables.h>
27#include <net/secure_seq.h>
28#include <net/ip.h>
29#include <net/tcp.h>
30#include <net/sock_reuseport.h>
31
32static u32 inet_ehashfn(const struct net *net, const __be32 laddr,
33 const __u16 lport, const __be32 faddr,
34 const __be16 fport)
35{
36 static u32 inet_ehash_secret __read_mostly;
37
38 net_get_random_once(&inet_ehash_secret, sizeof(inet_ehash_secret));
39
40 return __inet_ehashfn(laddr, lport, faddr, fport,
41 inet_ehash_secret + net_hash_mix(net));
42}
43
44/* This function handles inet_sock, but also timewait and request sockets
45 * for IPv4/IPv6.
46 */
47static u32 sk_ehashfn(const struct sock *sk)
48{
49#if IS_ENABLED(CONFIG_IPV6)
50 if (sk->sk_family == AF_INET6 &&
51 !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
52 return inet6_ehashfn(sock_net(sk),
53 &sk->sk_v6_rcv_saddr, sk->sk_num,
54 &sk->sk_v6_daddr, sk->sk_dport);
55#endif
56 return inet_ehashfn(sock_net(sk),
57 sk->sk_rcv_saddr, sk->sk_num,
58 sk->sk_daddr, sk->sk_dport);
59}
60
61/*
62 * Allocate and initialize a new local port bind bucket.
63 * The bindhash mutex for snum's hash chain must be held here.
64 */
65struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
66 struct net *net,
67 struct inet_bind_hashbucket *head,
68 const unsigned short snum)
69{
70 struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
71
72 if (tb) {
73 write_pnet(&tb->ib_net, net);
74 tb->port = snum;
75 tb->fastreuse = 0;
76 tb->fastreuseport = 0;
77 INIT_HLIST_HEAD(&tb->owners);
78 hlist_add_head(&tb->node, &head->chain);
79 }
80 return tb;
81}
82
83/*
84 * Caller must hold hashbucket lock for this tb with local BH disabled
85 */
86void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb)
87{
88 if (hlist_empty(&tb->owners)) {
89 __hlist_del(&tb->node);
90 kmem_cache_free(cachep, tb);
91 }
92}
93
94void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
95 const unsigned short snum)
96{
97 inet_sk(sk)->inet_num = snum;
98 sk_add_bind_node(sk, &tb->owners);
99 inet_csk(sk)->icsk_bind_hash = tb;
100}
101
102/*
103 * Get rid of any references to a local port held by the given sock.
104 */
105static void __inet_put_port(struct sock *sk)
106{
107 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
108 const int bhash = inet_bhashfn(sock_net(sk), inet_sk(sk)->inet_num,
109 hashinfo->bhash_size);
110 struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash];
111 struct inet_bind_bucket *tb;
112
113 spin_lock(&head->lock);
114 tb = inet_csk(sk)->icsk_bind_hash;
115 __sk_del_bind_node(sk);
116 inet_csk(sk)->icsk_bind_hash = NULL;
117 inet_sk(sk)->inet_num = 0;
118 inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
119 spin_unlock(&head->lock);
120}
121
122void inet_put_port(struct sock *sk)
123{
124 local_bh_disable();
125 __inet_put_port(sk);
126 local_bh_enable();
127}
128EXPORT_SYMBOL(inet_put_port);
129
130int __inet_inherit_port(const struct sock *sk, struct sock *child)
131{
132 struct inet_hashinfo *table = sk->sk_prot->h.hashinfo;
133 unsigned short port = inet_sk(child)->inet_num;
134 const int bhash = inet_bhashfn(sock_net(sk), port,
135 table->bhash_size);
136 struct inet_bind_hashbucket *head = &table->bhash[bhash];
137 struct inet_bind_bucket *tb;
138
139 spin_lock(&head->lock);
140 tb = inet_csk(sk)->icsk_bind_hash;
141 if (unlikely(!tb)) {
142 spin_unlock(&head->lock);
143 return -ENOENT;
144 }
145 if (tb->port != port) {
146 /* NOTE: using tproxy and redirecting skbs to a proxy
147 * on a different listener port breaks the assumption
148 * that the listener socket's icsk_bind_hash is the same
149 * as that of the child socket. We have to look up or
150 * create a new bind bucket for the child here. */
151 inet_bind_bucket_for_each(tb, &head->chain) {
152 if (net_eq(ib_net(tb), sock_net(sk)) &&
153 tb->port == port)
154 break;
155 }
156 if (!tb) {
157 tb = inet_bind_bucket_create(table->bind_bucket_cachep,
158 sock_net(sk), head, port);
159 if (!tb) {
160 spin_unlock(&head->lock);
161 return -ENOMEM;
162 }
163 }
164 }
165 inet_bind_hash(child, tb, port);
166 spin_unlock(&head->lock);
167
168 return 0;
169}
170EXPORT_SYMBOL_GPL(__inet_inherit_port);
171
172static struct inet_listen_hashbucket *
173inet_lhash2_bucket_sk(struct inet_hashinfo *h, struct sock *sk)
174{
175 u32 hash;
176
177#if IS_ENABLED(CONFIG_IPV6)
178 if (sk->sk_family == AF_INET6)
179 hash = ipv6_portaddr_hash(sock_net(sk),
180 &sk->sk_v6_rcv_saddr,
181 inet_sk(sk)->inet_num);
182 else
183#endif
184 hash = ipv4_portaddr_hash(sock_net(sk),
185 inet_sk(sk)->inet_rcv_saddr,
186 inet_sk(sk)->inet_num);
187 return inet_lhash2_bucket(h, hash);
188}
189
190static void inet_hash2(struct inet_hashinfo *h, struct sock *sk)
191{
192 struct inet_listen_hashbucket *ilb2;
193
194 if (!h->lhash2)
195 return;
196
197 ilb2 = inet_lhash2_bucket_sk(h, sk);
198
199 spin_lock(&ilb2->lock);
200 if (sk->sk_reuseport && sk->sk_family == AF_INET6)
201 hlist_add_tail_rcu(&inet_csk(sk)->icsk_listen_portaddr_node,
202 &ilb2->head);
203 else
204 hlist_add_head_rcu(&inet_csk(sk)->icsk_listen_portaddr_node,
205 &ilb2->head);
206 ilb2->count++;
207 spin_unlock(&ilb2->lock);
208}
209
210static void inet_unhash2(struct inet_hashinfo *h, struct sock *sk)
211{
212 struct inet_listen_hashbucket *ilb2;
213
214 if (!h->lhash2 ||
215 WARN_ON_ONCE(hlist_unhashed(&inet_csk(sk)->icsk_listen_portaddr_node)))
216 return;
217
218 ilb2 = inet_lhash2_bucket_sk(h, sk);
219
220 spin_lock(&ilb2->lock);
221 hlist_del_init_rcu(&inet_csk(sk)->icsk_listen_portaddr_node);
222 ilb2->count--;
223 spin_unlock(&ilb2->lock);
224}
225
226static inline int compute_score(struct sock *sk, struct net *net,
227 const unsigned short hnum, const __be32 daddr,
228 const int dif, const int sdif, bool exact_dif)
229{
230 int score = -1;
231 struct inet_sock *inet = inet_sk(sk);
232
233 if (net_eq(sock_net(sk), net) && inet->inet_num == hnum &&
234 !ipv6_only_sock(sk)) {
235 __be32 rcv_saddr = inet->inet_rcv_saddr;
236 score = sk->sk_family == PF_INET ? 2 : 1;
237 if (rcv_saddr) {
238 if (rcv_saddr != daddr)
239 return -1;
240 score += 4;
241 }
242 if (sk->sk_bound_dev_if || exact_dif) {
243 bool dev_match = (sk->sk_bound_dev_if == dif ||
244 sk->sk_bound_dev_if == sdif);
245
246 if (exact_dif && !dev_match)
247 return -1;
248 if (sk->sk_bound_dev_if && dev_match)
249 score += 4;
250 }
251 if (sk->sk_incoming_cpu == raw_smp_processor_id())
252 score++;
253 }
254 return score;
255}
256
257/*
258 * Here are some nice properties to exploit here. The BSD API
259 * does not allow a listening sock to specify the remote port nor the
260 * remote address for the connection. So always assume those are both
261 * wildcarded during the search since they can never be otherwise.
262 */
263
264/* called with rcu_read_lock() : No refcount taken on the socket */
265static struct sock *inet_lhash2_lookup(struct net *net,
266 struct inet_listen_hashbucket *ilb2,
267 struct sk_buff *skb, int doff,
268 const __be32 saddr, __be16 sport,
269 const __be32 daddr, const unsigned short hnum,
270 const int dif, const int sdif)
271{
272 bool exact_dif = inet_exact_dif_match(net, skb);
273 struct inet_connection_sock *icsk;
274 struct sock *sk, *result = NULL;
275 int score, hiscore = 0;
276 u32 phash = 0;
277
278 inet_lhash2_for_each_icsk_rcu(icsk, &ilb2->head) {
279 sk = (struct sock *)icsk;
280 score = compute_score(sk, net, hnum, daddr,
281 dif, sdif, exact_dif);
282 if (score > hiscore) {
283 if (sk->sk_reuseport) {
284 phash = inet_ehashfn(net, daddr, hnum,
285 saddr, sport);
286 result = reuseport_select_sock(sk, phash,
287 skb, doff);
288 if (result)
289 return result;
290 }
291 result = sk;
292 hiscore = score;
293 }
294 }
295
296 return result;
297}
298
299struct sock *__inet_lookup_listener(struct net *net,
300 struct inet_hashinfo *hashinfo,
301 struct sk_buff *skb, int doff,
302 const __be32 saddr, __be16 sport,
303 const __be32 daddr, const unsigned short hnum,
304 const int dif, const int sdif)
305{
306 unsigned int hash = inet_lhashfn(net, hnum);
307 struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
308 bool exact_dif = inet_exact_dif_match(net, skb);
309 struct inet_listen_hashbucket *ilb2;
310 struct sock *sk, *result = NULL;
311 int score, hiscore = 0;
312 unsigned int hash2;
313 u32 phash = 0;
314
315 if (ilb->count <= 10 || !hashinfo->lhash2)
316 goto port_lookup;
317
318 /* Too many sk in the ilb bucket (which is hashed by port alone).
319 * Try lhash2 (which is hashed by port and addr) instead.
320 */
321
322 hash2 = ipv4_portaddr_hash(net, daddr, hnum);
323 ilb2 = inet_lhash2_bucket(hashinfo, hash2);
324 if (ilb2->count > ilb->count)
325 goto port_lookup;
326
327 result = inet_lhash2_lookup(net, ilb2, skb, doff,
328 saddr, sport, daddr, hnum,
329 dif, sdif);
330 if (result)
331 return result;
332
333 /* Lookup lhash2 with INADDR_ANY */
334
335 hash2 = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum);
336 ilb2 = inet_lhash2_bucket(hashinfo, hash2);
337 if (ilb2->count > ilb->count)
338 goto port_lookup;
339
340 return inet_lhash2_lookup(net, ilb2, skb, doff,
341 saddr, sport, daddr, hnum,
342 dif, sdif);
343
344port_lookup:
345 sk_for_each_rcu(sk, &ilb->head) {
346 score = compute_score(sk, net, hnum, daddr,
347 dif, sdif, exact_dif);
348 if (score > hiscore) {
349 if (sk->sk_reuseport) {
350 phash = inet_ehashfn(net, daddr, hnum,
351 saddr, sport);
352 result = reuseport_select_sock(sk, phash,
353 skb, doff);
354 if (result)
355 return result;
356 }
357 result = sk;
358 hiscore = score;
359 }
360 }
361 return result;
362}
363EXPORT_SYMBOL_GPL(__inet_lookup_listener);
364
365/* All sockets share common refcount, but have different destructors */
366void sock_gen_put(struct sock *sk)
367{
368 if (!refcount_dec_and_test(&sk->sk_refcnt))
369 return;
370
371 if (sk->sk_state == TCP_TIME_WAIT)
372 inet_twsk_free(inet_twsk(sk));
373 else if (sk->sk_state == TCP_NEW_SYN_RECV)
374 reqsk_free(inet_reqsk(sk));
375 else
376 sk_free(sk);
377}
378EXPORT_SYMBOL_GPL(sock_gen_put);
379
380void sock_edemux(struct sk_buff *skb)
381{
382 sock_gen_put(skb->sk);
383}
384EXPORT_SYMBOL(sock_edemux);
385
386struct sock *__inet_lookup_established(struct net *net,
387 struct inet_hashinfo *hashinfo,
388 const __be32 saddr, const __be16 sport,
389 const __be32 daddr, const u16 hnum,
390 const int dif, const int sdif)
391{
392 INET_ADDR_COOKIE(acookie, saddr, daddr);
393 const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
394 struct sock *sk;
395 const struct hlist_nulls_node *node;
396 /* Optimize here for direct hit, only listening connections can
397 * have wildcards anyways.
398 */
399 unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport);
400 unsigned int slot = hash & hashinfo->ehash_mask;
401 struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
402
403begin:
404 sk_nulls_for_each_rcu(sk, node, &head->chain) {
405 if (sk->sk_hash != hash)
406 continue;
407 if (likely(INET_MATCH(sk, net, acookie,
408 saddr, daddr, ports, dif, sdif))) {
409 if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
410 goto out;
411 if (unlikely(!INET_MATCH(sk, net, acookie,
412 saddr, daddr, ports,
413 dif, sdif))) {
414 sock_gen_put(sk);
415 goto begin;
416 }
417 goto found;
418 }
419 }
420 /*
421 * if the nulls value we got at the end of this lookup is
422 * not the expected one, we must restart lookup.
423 * We probably met an item that was moved to another chain.
424 */
425 if (get_nulls_value(node) != slot)
426 goto begin;
427out:
428 sk = NULL;
429found:
430 return sk;
431}
432EXPORT_SYMBOL_GPL(__inet_lookup_established);
433
434/* called with local bh disabled */
435static int __inet_check_established(struct inet_timewait_death_row *death_row,
436 struct sock *sk, __u16 lport,
437 struct inet_timewait_sock **twp)
438{
439 struct inet_hashinfo *hinfo = death_row->hashinfo;
440 struct inet_sock *inet = inet_sk(sk);
441 __be32 daddr = inet->inet_rcv_saddr;
442 __be32 saddr = inet->inet_daddr;
443 int dif = sk->sk_bound_dev_if;
444 struct net *net = sock_net(sk);
445 int sdif = l3mdev_master_ifindex_by_index(net, dif);
446 INET_ADDR_COOKIE(acookie, saddr, daddr);
447 const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
448 unsigned int hash = inet_ehashfn(net, daddr, lport,
449 saddr, inet->inet_dport);
450 struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
451 spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
452 struct sock *sk2;
453 const struct hlist_nulls_node *node;
454 struct inet_timewait_sock *tw = NULL;
455
456 spin_lock(lock);
457
458 sk_nulls_for_each(sk2, node, &head->chain) {
459 if (sk2->sk_hash != hash)
460 continue;
461
462 if (likely(INET_MATCH(sk2, net, acookie,
463 saddr, daddr, ports, dif, sdif))) {
464 if (sk2->sk_state == TCP_TIME_WAIT) {
465 tw = inet_twsk(sk2);
466 if (twsk_unique(sk, sk2, twp))
467 break;
468 }
469 goto not_unique;
470 }
471 }
472
473 /* Must record num and sport now. Otherwise we will see
474 * in hash table socket with a funny identity.
475 */
476 inet->inet_num = lport;
477 inet->inet_sport = htons(lport);
478 sk->sk_hash = hash;
479 WARN_ON(!sk_unhashed(sk));
480 __sk_nulls_add_node_rcu(sk, &head->chain);
481 if (tw) {
482 sk_nulls_del_node_init_rcu((struct sock *)tw);
483 __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
484 }
485 spin_unlock(lock);
486 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
487
488 if (twp) {
489 *twp = tw;
490 } else if (tw) {
491 /* Silly. Should hash-dance instead... */
492 inet_twsk_deschedule_put(tw);
493 }
494 return 0;
495
496not_unique:
497 spin_unlock(lock);
498 return -EADDRNOTAVAIL;
499}
500
501static u32 inet_sk_port_offset(const struct sock *sk)
502{
503 const struct inet_sock *inet = inet_sk(sk);
504
505 return secure_ipv4_port_ephemeral(inet->inet_rcv_saddr,
506 inet->inet_daddr,
507 inet->inet_dport);
508}
509
510/* insert a socket into ehash, and eventually remove another one
511 * (The another one can be a SYN_RECV or TIMEWAIT
512 */
513bool inet_ehash_insert(struct sock *sk, struct sock *osk)
514{
515 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
516 struct hlist_nulls_head *list;
517 struct inet_ehash_bucket *head;
518 spinlock_t *lock;
519 bool ret = true;
520
521 WARN_ON_ONCE(!sk_unhashed(sk));
522
523 sk->sk_hash = sk_ehashfn(sk);
524 head = inet_ehash_bucket(hashinfo, sk->sk_hash);
525 list = &head->chain;
526 lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
527
528 spin_lock(lock);
529 if (osk) {
530 WARN_ON_ONCE(sk->sk_hash != osk->sk_hash);
531 ret = sk_nulls_del_node_init_rcu(osk);
532 }
533 if (ret)
534 __sk_nulls_add_node_rcu(sk, list);
535 spin_unlock(lock);
536 return ret;
537}
538
539bool inet_ehash_nolisten(struct sock *sk, struct sock *osk)
540{
541 bool ok = inet_ehash_insert(sk, osk);
542
543 if (ok) {
544 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
545 } else {
546 percpu_counter_inc(sk->sk_prot->orphan_count);
547 inet_sk_set_state(sk, TCP_CLOSE);
548 sock_set_flag(sk, SOCK_DEAD);
549 inet_csk_destroy_sock(sk);
550 }
551 return ok;
552}
553EXPORT_SYMBOL_GPL(inet_ehash_nolisten);
554
555static int inet_reuseport_add_sock(struct sock *sk,
556 struct inet_listen_hashbucket *ilb)
557{
558 struct inet_bind_bucket *tb = inet_csk(sk)->icsk_bind_hash;
559 struct sock *sk2;
560 kuid_t uid = sock_i_uid(sk);
561
562 sk_for_each_rcu(sk2, &ilb->head) {
563 if (sk2 != sk &&
564 sk2->sk_family == sk->sk_family &&
565 ipv6_only_sock(sk2) == ipv6_only_sock(sk) &&
566 sk2->sk_bound_dev_if == sk->sk_bound_dev_if &&
567 inet_csk(sk2)->icsk_bind_hash == tb &&
568 sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) &&
569 inet_rcv_saddr_equal(sk, sk2, false))
570 return reuseport_add_sock(sk, sk2);
571 }
572
573 return reuseport_alloc(sk);
574}
575
576int __inet_hash(struct sock *sk, struct sock *osk)
577{
578 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
579 struct inet_listen_hashbucket *ilb;
580 int err = 0;
581
582 if (sk->sk_state != TCP_LISTEN) {
583 inet_ehash_nolisten(sk, osk);
584 return 0;
585 }
586 WARN_ON(!sk_unhashed(sk));
587 ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
588
589 spin_lock(&ilb->lock);
590 if (sk->sk_reuseport) {
591 err = inet_reuseport_add_sock(sk, ilb);
592 if (err)
593 goto unlock;
594 }
595 if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
596 sk->sk_family == AF_INET6)
597 hlist_add_tail_rcu(&sk->sk_node, &ilb->head);
598 else
599 hlist_add_head_rcu(&sk->sk_node, &ilb->head);
600 inet_hash2(hashinfo, sk);
601 ilb->count++;
602 sock_set_flag(sk, SOCK_RCU_FREE);
603 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
604unlock:
605 spin_unlock(&ilb->lock);
606
607 return err;
608}
609EXPORT_SYMBOL(__inet_hash);
610
611int inet_hash(struct sock *sk)
612{
613 int err = 0;
614
615 if (sk->sk_state != TCP_CLOSE) {
616 local_bh_disable();
617 err = __inet_hash(sk, NULL);
618 local_bh_enable();
619 }
620
621 return err;
622}
623EXPORT_SYMBOL_GPL(inet_hash);
624
625void inet_unhash(struct sock *sk)
626{
627 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
628 struct inet_listen_hashbucket *ilb = NULL;
629 spinlock_t *lock;
630
631 if (sk_unhashed(sk))
632 return;
633
634 if (sk->sk_state == TCP_LISTEN) {
635 ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
636 lock = &ilb->lock;
637 } else {
638 lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
639 }
640 spin_lock_bh(lock);
641 if (sk_unhashed(sk))
642 goto unlock;
643
644 if (rcu_access_pointer(sk->sk_reuseport_cb))
645 reuseport_detach_sock(sk);
646 if (ilb) {
647 inet_unhash2(hashinfo, sk);
648 __sk_del_node_init(sk);
649 ilb->count--;
650 } else {
651 __sk_nulls_del_node_init_rcu(sk);
652 }
653 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
654unlock:
655 spin_unlock_bh(lock);
656}
657EXPORT_SYMBOL_GPL(inet_unhash);
658
659int __inet_hash_connect(struct inet_timewait_death_row *death_row,
660 struct sock *sk, u32 port_offset,
661 int (*check_established)(struct inet_timewait_death_row *,
662 struct sock *, __u16, struct inet_timewait_sock **))
663{
664 struct inet_hashinfo *hinfo = death_row->hashinfo;
665 struct inet_timewait_sock *tw = NULL;
666 struct inet_bind_hashbucket *head;
667 int port = inet_sk(sk)->inet_num;
668 struct net *net = sock_net(sk);
669 struct inet_bind_bucket *tb;
670 u32 remaining, offset;
671 int ret, i, low, high;
672 static u32 hint;
673
674 if (port) {
675 head = &hinfo->bhash[inet_bhashfn(net, port,
676 hinfo->bhash_size)];
677 tb = inet_csk(sk)->icsk_bind_hash;
678 spin_lock_bh(&head->lock);
679 if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) {
680 inet_ehash_nolisten(sk, NULL);
681 spin_unlock_bh(&head->lock);
682 return 0;
683 }
684 spin_unlock(&head->lock);
685 /* No definite answer... Walk to established hash table */
686 ret = check_established(death_row, sk, port, NULL);
687 local_bh_enable();
688 return ret;
689 }
690
691 inet_get_local_port_range(net, &low, &high);
692 high++; /* [32768, 60999] -> [32768, 61000[ */
693 remaining = high - low;
694 if (likely(remaining > 1))
695 remaining &= ~1U;
696
697 offset = (hint + port_offset) % remaining;
698 /* In first pass we try ports of @low parity.
699 * inet_csk_get_port() does the opposite choice.
700 */
701 offset &= ~1U;
702other_parity_scan:
703 port = low + offset;
704 for (i = 0; i < remaining; i += 2, port += 2) {
705 if (unlikely(port >= high))
706 port -= remaining;
707 if (inet_is_local_reserved_port(net, port))
708 continue;
709 head = &hinfo->bhash[inet_bhashfn(net, port,
710 hinfo->bhash_size)];
711 spin_lock_bh(&head->lock);
712
713 /* Does not bother with rcv_saddr checks, because
714 * the established check is already unique enough.
715 */
716 inet_bind_bucket_for_each(tb, &head->chain) {
717 if (net_eq(ib_net(tb), net) && tb->port == port) {
718 if (tb->fastreuse >= 0 ||
719 tb->fastreuseport >= 0)
720 goto next_port;
721 WARN_ON(hlist_empty(&tb->owners));
722 if (!check_established(death_row, sk,
723 port, &tw))
724 goto ok;
725 goto next_port;
726 }
727 }
728
729 tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
730 net, head, port);
731 if (!tb) {
732 spin_unlock_bh(&head->lock);
733 return -ENOMEM;
734 }
735 tb->fastreuse = -1;
736 tb->fastreuseport = -1;
737 goto ok;
738next_port:
739 spin_unlock_bh(&head->lock);
740 cond_resched();
741 }
742
743 offset++;
744 if ((offset & 1) && remaining > 1)
745 goto other_parity_scan;
746
747 return -EADDRNOTAVAIL;
748
749ok:
750 hint += i + 2;
751
752 /* Head lock still held and bh's disabled */
753 inet_bind_hash(sk, tb, port);
754 if (sk_unhashed(sk)) {
755 inet_sk(sk)->inet_sport = htons(port);
756 inet_ehash_nolisten(sk, (struct sock *)tw);
757 }
758 if (tw)
759 inet_twsk_bind_unhash(tw, hinfo);
760 spin_unlock(&head->lock);
761 if (tw)
762 inet_twsk_deschedule_put(tw);
763 local_bh_enable();
764 return 0;
765}
766
767/*
768 * Bind a port for a connect operation and hash it.
769 */
770int inet_hash_connect(struct inet_timewait_death_row *death_row,
771 struct sock *sk)
772{
773 u32 port_offset = 0;
774
775 if (!inet_sk(sk)->inet_num)
776 port_offset = inet_sk_port_offset(sk);
777 return __inet_hash_connect(death_row, sk, port_offset,
778 __inet_check_established);
779}
780EXPORT_SYMBOL_GPL(inet_hash_connect);
781
782void inet_hashinfo_init(struct inet_hashinfo *h)
783{
784 int i;
785
786 for (i = 0; i < INET_LHTABLE_SIZE; i++) {
787 spin_lock_init(&h->listening_hash[i].lock);
788 INIT_HLIST_HEAD(&h->listening_hash[i].head);
789 h->listening_hash[i].count = 0;
790 }
791
792 h->lhash2 = NULL;
793}
794EXPORT_SYMBOL_GPL(inet_hashinfo_init);
795
796void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
797 unsigned long numentries, int scale,
798 unsigned long low_limit,
799 unsigned long high_limit)
800{
801 unsigned int i;
802
803 h->lhash2 = alloc_large_system_hash(name,
804 sizeof(*h->lhash2),
805 numentries,
806 scale,
807 0,
808 NULL,
809 &h->lhash2_mask,
810 low_limit,
811 high_limit);
812
813 for (i = 0; i <= h->lhash2_mask; i++) {
814 spin_lock_init(&h->lhash2[i].lock);
815 INIT_HLIST_HEAD(&h->lhash2[i].head);
816 h->lhash2[i].count = 0;
817 }
818}
819
820int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
821{
822 unsigned int locksz = sizeof(spinlock_t);
823 unsigned int i, nblocks = 1;
824
825 if (locksz != 0) {
826 /* allocate 2 cache lines or at least one spinlock per cpu */
827 nblocks = max(2U * L1_CACHE_BYTES / locksz, 1U);
828 nblocks = roundup_pow_of_two(nblocks * num_possible_cpus());
829
830 /* no more locks than number of hash buckets */
831 nblocks = min(nblocks, hashinfo->ehash_mask + 1);
832
833 hashinfo->ehash_locks = kvmalloc_array(nblocks, locksz, GFP_KERNEL);
834 if (!hashinfo->ehash_locks)
835 return -ENOMEM;
836
837 for (i = 0; i < nblocks; i++)
838 spin_lock_init(&hashinfo->ehash_locks[i]);
839 }
840 hashinfo->ehash_locks_mask = nblocks - 1;
841 return 0;
842}
843EXPORT_SYMBOL_GPL(inet_ehash_locks_alloc);