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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 * Generic INET transport hashtables
8 *
9 * Authors: Lotsa people, from code originally in tcp
10 */
11
12#include <linux/module.h>
13#include <linux/random.h>
14#include <linux/sched.h>
15#include <linux/slab.h>
16#include <linux/wait.h>
17#include <linux/vmalloc.h>
18#include <linux/memblock.h>
19#include <linux/gcd.h>
20
21#include <net/addrconf.h>
22#include <net/inet_connection_sock.h>
23#include <net/inet_hashtables.h>
24#if IS_ENABLED(CONFIG_IPV6)
25#include <net/inet6_hashtables.h>
26#endif
27#include <net/hotdata.h>
28#include <net/ip.h>
29#include <net/rps.h>
30#include <net/secure_seq.h>
31#include <net/sock_reuseport.h>
32#include <net/tcp.h>
33
34static void inet_init_ehash_secret(void)
35{
36 net_get_random_sleepable_once(&inet_ehash_secret,
37 sizeof(inet_ehash_secret));
38}
39
40u32 inet_ehashfn(const struct net *net, const __be32 laddr,
41 const __u16 lport, const __be32 faddr,
42 const __be16 fport)
43{
44 return lport + __inet_ehashfn(laddr, 0, faddr, fport,
45 inet_ehash_secret + net_hash_mix(net));
46}
47EXPORT_SYMBOL_GPL(inet_ehashfn);
48
49/* This function handles inet_sock, but also timewait and request sockets
50 * for IPv4/IPv6.
51 */
52static u32 sk_ehashfn(const struct sock *sk)
53{
54#if IS_ENABLED(CONFIG_IPV6)
55 if (sk->sk_family == AF_INET6 &&
56 !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
57 return inet6_ehashfn(sock_net(sk),
58 &sk->sk_v6_rcv_saddr, sk->sk_num,
59 &sk->sk_v6_daddr, sk->sk_dport);
60#endif
61 return inet_ehashfn(sock_net(sk),
62 sk->sk_rcv_saddr, sk->sk_num,
63 sk->sk_daddr, sk->sk_dport);
64}
65
66static bool sk_is_connect_bind(const struct sock *sk)
67{
68 if (sk->sk_state == TCP_TIME_WAIT)
69 return inet_twsk(sk)->tw_connect_bind;
70 else
71 return sk->sk_userlocks & SOCK_CONNECT_BIND;
72}
73
74/*
75 * Allocate and initialize a new local port bind bucket.
76 * The bindhash mutex for snum's hash chain must be held here.
77 */
78struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
79 struct net *net,
80 struct inet_bind_hashbucket *head,
81 const unsigned short snum,
82 int l3mdev)
83{
84 struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
85
86 if (tb) {
87 write_pnet(&tb->ib_net, net);
88 tb->l3mdev = l3mdev;
89 tb->port = snum;
90 tb->fastreuse = 0;
91 tb->fastreuseport = 0;
92 INIT_HLIST_HEAD(&tb->bhash2);
93 hlist_add_head_rcu(&tb->node, &head->chain);
94 }
95 return tb;
96}
97
98/*
99 * Caller must hold hashbucket lock for this tb with local BH disabled
100 */
101void inet_bind_bucket_destroy(struct inet_bind_bucket *tb)
102{
103 const struct inet_bind2_bucket *tb2;
104
105 if (hlist_empty(&tb->bhash2)) {
106 hlist_del_rcu(&tb->node);
107 kfree_rcu(tb, rcu);
108 return;
109 }
110
111 if (tb->fastreuse == -1 && tb->fastreuseport == -1)
112 return;
113 hlist_for_each_entry(tb2, &tb->bhash2, bhash_node) {
114 if (tb2->fastreuse != -1 || tb2->fastreuseport != -1)
115 return;
116 }
117 tb->fastreuse = -1;
118 tb->fastreuseport = -1;
119}
120
121bool inet_bind_bucket_match(const struct inet_bind_bucket *tb, const struct net *net,
122 unsigned short port, int l3mdev)
123{
124 return net_eq(ib_net(tb), net) && tb->port == port &&
125 tb->l3mdev == l3mdev;
126}
127
128static void inet_bind2_bucket_init(struct inet_bind2_bucket *tb2,
129 struct net *net,
130 struct inet_bind_hashbucket *head,
131 struct inet_bind_bucket *tb,
132 const struct sock *sk)
133{
134 write_pnet(&tb2->ib_net, net);
135 tb2->l3mdev = tb->l3mdev;
136 tb2->port = tb->port;
137#if IS_ENABLED(CONFIG_IPV6)
138 BUILD_BUG_ON(USHRT_MAX < (IPV6_ADDR_ANY | IPV6_ADDR_MAPPED));
139 if (sk->sk_family == AF_INET6) {
140 tb2->addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
141 tb2->v6_rcv_saddr = sk->sk_v6_rcv_saddr;
142 } else {
143 tb2->addr_type = IPV6_ADDR_MAPPED;
144 ipv6_addr_set_v4mapped(sk->sk_rcv_saddr, &tb2->v6_rcv_saddr);
145 }
146#else
147 tb2->rcv_saddr = sk->sk_rcv_saddr;
148#endif
149 tb2->fastreuse = 0;
150 tb2->fastreuseport = 0;
151 INIT_HLIST_HEAD(&tb2->owners);
152 hlist_add_head(&tb2->node, &head->chain);
153 hlist_add_head(&tb2->bhash_node, &tb->bhash2);
154}
155
156struct inet_bind2_bucket *inet_bind2_bucket_create(struct kmem_cache *cachep,
157 struct net *net,
158 struct inet_bind_hashbucket *head,
159 struct inet_bind_bucket *tb,
160 const struct sock *sk)
161{
162 struct inet_bind2_bucket *tb2 = kmem_cache_alloc(cachep, GFP_ATOMIC);
163
164 if (tb2)
165 inet_bind2_bucket_init(tb2, net, head, tb, sk);
166
167 return tb2;
168}
169
170/* Caller must hold hashbucket lock for this tb with local BH disabled */
171void inet_bind2_bucket_destroy(struct kmem_cache *cachep, struct inet_bind2_bucket *tb)
172{
173 const struct sock *sk;
174
175 if (hlist_empty(&tb->owners)) {
176 __hlist_del(&tb->node);
177 __hlist_del(&tb->bhash_node);
178 kmem_cache_free(cachep, tb);
179 return;
180 }
181
182 if (tb->fastreuse == -1 && tb->fastreuseport == -1)
183 return;
184 sk_for_each_bound(sk, &tb->owners) {
185 if (!sk_is_connect_bind(sk))
186 return;
187 }
188 tb->fastreuse = -1;
189 tb->fastreuseport = -1;
190}
191
192static bool inet_bind2_bucket_addr_match(const struct inet_bind2_bucket *tb2,
193 const struct sock *sk)
194{
195#if IS_ENABLED(CONFIG_IPV6)
196 if (sk->sk_family == AF_INET6)
197 return ipv6_addr_equal(&tb2->v6_rcv_saddr, &sk->sk_v6_rcv_saddr);
198
199 if (tb2->addr_type != IPV6_ADDR_MAPPED)
200 return false;
201#endif
202 return tb2->rcv_saddr == sk->sk_rcv_saddr;
203}
204
205void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
206 struct inet_bind2_bucket *tb2, unsigned short port)
207{
208 WRITE_ONCE(inet_sk(sk)->inet_num, port);
209 inet_csk(sk)->icsk_bind_hash = tb;
210 inet_csk(sk)->icsk_bind2_hash = tb2;
211 sk_add_bind_node(sk, &tb2->owners);
212}
213
214/*
215 * Get rid of any references to a local port held by the given sock.
216 */
217static void __inet_put_port(struct sock *sk)
218{
219 struct inet_hashinfo *hashinfo = tcp_get_hashinfo(sk);
220 struct inet_bind_hashbucket *head, *head2;
221 struct net *net = sock_net(sk);
222 struct inet_bind_bucket *tb;
223 int bhash;
224
225 bhash = inet_bhashfn(net, inet_sk(sk)->inet_num, hashinfo->bhash_size);
226 head = &hashinfo->bhash[bhash];
227 head2 = inet_bhashfn_portaddr(hashinfo, sk, net, inet_sk(sk)->inet_num);
228
229 spin_lock(&head->lock);
230 tb = inet_csk(sk)->icsk_bind_hash;
231 inet_csk(sk)->icsk_bind_hash = NULL;
232 WRITE_ONCE(inet_sk(sk)->inet_num, 0);
233 sk->sk_userlocks &= ~SOCK_CONNECT_BIND;
234
235 spin_lock(&head2->lock);
236 if (inet_csk(sk)->icsk_bind2_hash) {
237 struct inet_bind2_bucket *tb2 = inet_csk(sk)->icsk_bind2_hash;
238
239 __sk_del_bind_node(sk);
240 inet_csk(sk)->icsk_bind2_hash = NULL;
241 inet_bind2_bucket_destroy(hashinfo->bind2_bucket_cachep, tb2);
242 }
243 spin_unlock(&head2->lock);
244
245 inet_bind_bucket_destroy(tb);
246 spin_unlock(&head->lock);
247}
248
249void inet_put_port(struct sock *sk)
250{
251 local_bh_disable();
252 __inet_put_port(sk);
253 local_bh_enable();
254}
255
256int __inet_inherit_port(const struct sock *sk, struct sock *child)
257{
258 struct inet_hashinfo *table = tcp_get_hashinfo(sk);
259 unsigned short port = inet_sk(child)->inet_num;
260 struct inet_bind_hashbucket *head, *head2;
261 bool created_inet_bind_bucket = false;
262 struct net *net = sock_net(sk);
263 bool update_fastreuse = false;
264 struct inet_bind2_bucket *tb2;
265 struct inet_bind_bucket *tb;
266 int bhash, l3mdev;
267
268 bhash = inet_bhashfn(net, port, table->bhash_size);
269 head = &table->bhash[bhash];
270 head2 = inet_bhashfn_portaddr(table, child, net, port);
271
272 spin_lock(&head->lock);
273 spin_lock(&head2->lock);
274 tb = inet_csk(sk)->icsk_bind_hash;
275 tb2 = inet_csk(sk)->icsk_bind2_hash;
276 if (unlikely(!tb || !tb2)) {
277 spin_unlock(&head2->lock);
278 spin_unlock(&head->lock);
279 return -ENOENT;
280 }
281 if (tb->port != port) {
282 l3mdev = inet_sk_bound_l3mdev(sk);
283
284 /* NOTE: using tproxy and redirecting skbs to a proxy
285 * on a different listener port breaks the assumption
286 * that the listener socket's icsk_bind_hash is the same
287 * as that of the child socket. We have to look up or
288 * create a new bind bucket for the child here. */
289 inet_bind_bucket_for_each(tb, &head->chain) {
290 if (inet_bind_bucket_match(tb, net, port, l3mdev))
291 break;
292 }
293 if (!tb) {
294 tb = inet_bind_bucket_create(table->bind_bucket_cachep,
295 net, head, port, l3mdev);
296 if (!tb) {
297 spin_unlock(&head2->lock);
298 spin_unlock(&head->lock);
299 return -ENOMEM;
300 }
301 created_inet_bind_bucket = true;
302 }
303 update_fastreuse = true;
304
305 goto bhash2_find;
306 } else if (!inet_bind2_bucket_addr_match(tb2, child)) {
307 l3mdev = inet_sk_bound_l3mdev(sk);
308
309bhash2_find:
310 tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, child);
311 if (!tb2) {
312 tb2 = inet_bind2_bucket_create(table->bind2_bucket_cachep,
313 net, head2, tb, child);
314 if (!tb2)
315 goto error;
316 }
317 }
318 if (update_fastreuse)
319 inet_csk_update_fastreuse(child, tb, tb2);
320 inet_bind_hash(child, tb, tb2, port);
321 spin_unlock(&head2->lock);
322 spin_unlock(&head->lock);
323
324 return 0;
325
326error:
327 if (created_inet_bind_bucket)
328 inet_bind_bucket_destroy(tb);
329 spin_unlock(&head2->lock);
330 spin_unlock(&head->lock);
331 return -ENOMEM;
332}
333
334static struct inet_listen_hashbucket *
335inet_lhash2_bucket_sk(struct inet_hashinfo *h, struct sock *sk)
336{
337 u32 hash;
338
339#if IS_ENABLED(CONFIG_IPV6)
340 if (sk->sk_family == AF_INET6)
341 hash = ipv6_portaddr_hash(sock_net(sk),
342 &sk->sk_v6_rcv_saddr,
343 inet_sk(sk)->inet_num);
344 else
345#endif
346 hash = ipv4_portaddr_hash(sock_net(sk),
347 inet_sk(sk)->inet_rcv_saddr,
348 inet_sk(sk)->inet_num);
349 return inet_lhash2_bucket(h, hash);
350}
351
352static inline int compute_score(struct sock *sk, const struct net *net,
353 const unsigned short hnum, const __be32 daddr,
354 const int dif, const int sdif)
355{
356 int score = -1;
357
358 if (net_eq(sock_net(sk), net) && READ_ONCE(sk->sk_num) == hnum &&
359 !ipv6_only_sock(sk)) {
360 if (sk->sk_rcv_saddr != daddr)
361 return -1;
362
363 if (!inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
364 return -1;
365 score = sk->sk_bound_dev_if ? 2 : 1;
366
367 if (sk->sk_family == PF_INET)
368 score++;
369 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
370 score++;
371 }
372 return score;
373}
374
375/**
376 * inet_lookup_reuseport() - execute reuseport logic on AF_INET socket if necessary.
377 * @net: network namespace.
378 * @sk: AF_INET socket, must be in TCP_LISTEN state for TCP or TCP_CLOSE for UDP.
379 * @skb: context for a potential SK_REUSEPORT program.
380 * @doff: header offset.
381 * @saddr: source address.
382 * @sport: source port.
383 * @daddr: destination address.
384 * @hnum: destination port in host byte order.
385 * @ehashfn: hash function used to generate the fallback hash.
386 *
387 * Return: NULL if sk doesn't have SO_REUSEPORT set, otherwise a pointer to
388 * the selected sock or an error.
389 */
390struct sock *inet_lookup_reuseport(const struct net *net, struct sock *sk,
391 struct sk_buff *skb, int doff,
392 __be32 saddr, __be16 sport,
393 __be32 daddr, unsigned short hnum,
394 inet_ehashfn_t *ehashfn)
395{
396 struct sock *reuse_sk = NULL;
397 u32 phash;
398
399 if (sk->sk_reuseport) {
400 phash = INDIRECT_CALL_2(ehashfn, udp_ehashfn, inet_ehashfn,
401 net, daddr, hnum, saddr, sport);
402 reuse_sk = reuseport_select_sock(sk, phash, skb, doff);
403 }
404 return reuse_sk;
405}
406EXPORT_SYMBOL_GPL(inet_lookup_reuseport);
407
408/*
409 * Here are some nice properties to exploit here. The BSD API
410 * does not allow a listening sock to specify the remote port nor the
411 * remote address for the connection. So always assume those are both
412 * wildcarded during the search since they can never be otherwise.
413 */
414
415/* called with rcu_read_lock() : No refcount taken on the socket */
416static struct sock *inet_lhash2_lookup(const struct net *net,
417 struct inet_listen_hashbucket *ilb2,
418 struct sk_buff *skb, int doff,
419 const __be32 saddr, __be16 sport,
420 const __be32 daddr, const unsigned short hnum,
421 const int dif, const int sdif)
422{
423 struct sock *sk, *result = NULL;
424 struct hlist_nulls_node *node;
425 int score, hiscore = 0;
426
427 sk_nulls_for_each_rcu(sk, node, &ilb2->nulls_head) {
428 score = compute_score(sk, net, hnum, daddr, dif, sdif);
429 if (score > hiscore) {
430 result = inet_lookup_reuseport(net, sk, skb, doff,
431 saddr, sport, daddr, hnum, inet_ehashfn);
432 if (result)
433 return result;
434
435 result = sk;
436 hiscore = score;
437 }
438 }
439
440 return result;
441}
442
443struct sock *inet_lookup_run_sk_lookup(const struct net *net,
444 int protocol,
445 struct sk_buff *skb, int doff,
446 __be32 saddr, __be16 sport,
447 __be32 daddr, u16 hnum, const int dif,
448 inet_ehashfn_t *ehashfn)
449{
450 struct sock *sk, *reuse_sk;
451 bool no_reuseport;
452
453 no_reuseport = bpf_sk_lookup_run_v4(net, protocol, saddr, sport,
454 daddr, hnum, dif, &sk);
455 if (no_reuseport || IS_ERR_OR_NULL(sk))
456 return sk;
457
458 reuse_sk = inet_lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum,
459 ehashfn);
460 if (reuse_sk)
461 sk = reuse_sk;
462 return sk;
463}
464
465struct sock *__inet_lookup_listener(const struct net *net,
466 struct sk_buff *skb, int doff,
467 const __be32 saddr, __be16 sport,
468 const __be32 daddr, const unsigned short hnum,
469 const int dif, const int sdif)
470{
471 struct inet_listen_hashbucket *ilb2;
472 struct inet_hashinfo *hashinfo;
473 struct sock *result = NULL;
474 unsigned int hash2;
475
476 /* Lookup redirect from BPF */
477 if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
478 result = inet_lookup_run_sk_lookup(net, IPPROTO_TCP, skb, doff,
479 saddr, sport, daddr, hnum, dif,
480 inet_ehashfn);
481 if (result)
482 goto done;
483 }
484
485 hashinfo = net->ipv4.tcp_death_row.hashinfo;
486 hash2 = ipv4_portaddr_hash(net, daddr, hnum);
487 ilb2 = inet_lhash2_bucket(hashinfo, hash2);
488
489 result = inet_lhash2_lookup(net, ilb2, skb, doff,
490 saddr, sport, daddr, hnum,
491 dif, sdif);
492 if (result)
493 goto done;
494
495 /* Lookup lhash2 with INADDR_ANY */
496 hash2 = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum);
497 ilb2 = inet_lhash2_bucket(hashinfo, hash2);
498
499 result = inet_lhash2_lookup(net, ilb2, skb, doff,
500 saddr, sport, htonl(INADDR_ANY), hnum,
501 dif, sdif);
502done:
503 if (IS_ERR(result))
504 return NULL;
505 return result;
506}
507EXPORT_SYMBOL_GPL(__inet_lookup_listener);
508
509/* All sockets share common refcount, but have different destructors */
510void sock_gen_put(struct sock *sk)
511{
512 if (!refcount_dec_and_test(&sk->sk_refcnt))
513 return;
514
515 if (sk->sk_state == TCP_TIME_WAIT)
516 inet_twsk_free(inet_twsk(sk));
517 else if (sk->sk_state == TCP_NEW_SYN_RECV)
518 reqsk_free(inet_reqsk(sk));
519 else
520 sk_free(sk);
521}
522EXPORT_SYMBOL_GPL(sock_gen_put);
523
524void sock_edemux(struct sk_buff *skb)
525{
526 sock_gen_put(skb->sk);
527}
528EXPORT_SYMBOL(sock_edemux);
529
530struct sock *__inet_lookup_established(const struct net *net,
531 const __be32 saddr, const __be16 sport,
532 const __be32 daddr, const u16 hnum,
533 const int dif, const int sdif)
534{
535 const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
536 INET_ADDR_COOKIE(acookie, saddr, daddr);
537 const struct hlist_nulls_node *node;
538 struct inet_ehash_bucket *head;
539 struct inet_hashinfo *hashinfo;
540 unsigned int hash, slot;
541 struct sock *sk;
542
543 hashinfo = net->ipv4.tcp_death_row.hashinfo;
544 hash = inet_ehashfn(net, daddr, hnum, saddr, sport);
545 slot = hash & hashinfo->ehash_mask;
546 head = &hashinfo->ehash[slot];
547
548begin:
549 sk_nulls_for_each_rcu(sk, node, &head->chain) {
550 if (sk->sk_hash != hash)
551 continue;
552 if (likely(inet_match(net, sk, acookie, ports, dif, sdif))) {
553 if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
554 goto out;
555 if (unlikely(!inet_match(net, sk, acookie,
556 ports, dif, sdif))) {
557 sock_gen_put(sk);
558 goto begin;
559 }
560 goto found;
561 }
562 }
563 /*
564 * if the nulls value we got at the end of this lookup is
565 * not the expected one, we must restart lookup.
566 * We probably met an item that was moved to another chain.
567 */
568 if (get_nulls_value(node) != slot)
569 goto begin;
570out:
571 sk = NULL;
572found:
573 return sk;
574}
575EXPORT_SYMBOL_GPL(__inet_lookup_established);
576
577/* called with local bh disabled */
578static int __inet_check_established(struct inet_timewait_death_row *death_row,
579 struct sock *sk, __u16 lport,
580 struct inet_timewait_sock **twp,
581 bool rcu_lookup,
582 u32 hash)
583{
584 struct inet_hashinfo *hinfo = death_row->hashinfo;
585 struct inet_sock *inet = inet_sk(sk);
586 __be32 daddr = inet->inet_rcv_saddr;
587 __be32 saddr = inet->inet_daddr;
588 int dif = sk->sk_bound_dev_if;
589 struct net *net = sock_net(sk);
590 int sdif = l3mdev_master_ifindex_by_index(net, dif);
591 INET_ADDR_COOKIE(acookie, saddr, daddr);
592 const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
593 struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
594 struct inet_timewait_sock *tw = NULL;
595 const struct hlist_nulls_node *node;
596 struct sock *sk2;
597 spinlock_t *lock;
598
599 if (rcu_lookup) {
600 sk_nulls_for_each(sk2, node, &head->chain) {
601 if (sk2->sk_hash != hash ||
602 !inet_match(net, sk2, acookie, ports, dif, sdif))
603 continue;
604 if (sk2->sk_state == TCP_TIME_WAIT)
605 break;
606 return -EADDRNOTAVAIL;
607 }
608 return 0;
609 }
610
611 lock = inet_ehash_lockp(hinfo, hash);
612 spin_lock(lock);
613
614 sk_nulls_for_each(sk2, node, &head->chain) {
615 if (sk2->sk_hash != hash)
616 continue;
617
618 if (likely(inet_match(net, sk2, acookie, ports, dif, sdif))) {
619 if (sk2->sk_state == TCP_TIME_WAIT) {
620 tw = inet_twsk(sk2);
621 if (tcp_twsk_unique(sk, sk2, twp))
622 break;
623 }
624 goto not_unique;
625 }
626 }
627
628 /* Must record num and sport now. Otherwise we will see
629 * in hash table socket with a funny identity.
630 */
631 inet->inet_num = lport;
632 inet->inet_sport = htons(lport);
633 sk->sk_hash = hash;
634 WARN_ON(!sk_unhashed(sk));
635 __sk_nulls_add_node_rcu(sk, &head->chain);
636 if (tw) {
637 sk_nulls_del_node_init_rcu((struct sock *)tw);
638 __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
639 }
640 spin_unlock(lock);
641 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
642
643 if (twp) {
644 *twp = tw;
645 } else if (tw) {
646 /* Silly. Should hash-dance instead... */
647 inet_twsk_deschedule_put(tw);
648 }
649 return 0;
650
651not_unique:
652 spin_unlock(lock);
653 return -EADDRNOTAVAIL;
654}
655
656static u64 inet_sk_port_offset(const struct sock *sk)
657{
658 const struct inet_sock *inet = inet_sk(sk);
659
660 return secure_ipv4_port_ephemeral(inet->inet_rcv_saddr,
661 inet->inet_daddr,
662 inet->inet_dport);
663}
664
665/* Searches for an exsiting socket in the ehash bucket list.
666 * Returns true if found, false otherwise.
667 */
668static bool inet_ehash_lookup_by_sk(struct sock *sk,
669 struct hlist_nulls_head *list)
670{
671 const __portpair ports = INET_COMBINED_PORTS(sk->sk_dport, sk->sk_num);
672 const int sdif = sk->sk_bound_dev_if;
673 const int dif = sk->sk_bound_dev_if;
674 const struct hlist_nulls_node *node;
675 struct net *net = sock_net(sk);
676 struct sock *esk;
677
678 INET_ADDR_COOKIE(acookie, sk->sk_daddr, sk->sk_rcv_saddr);
679
680 sk_nulls_for_each_rcu(esk, node, list) {
681 if (esk->sk_hash != sk->sk_hash)
682 continue;
683 if (sk->sk_family == AF_INET) {
684 if (unlikely(inet_match(net, esk, acookie,
685 ports, dif, sdif))) {
686 return true;
687 }
688 }
689#if IS_ENABLED(CONFIG_IPV6)
690 else if (sk->sk_family == AF_INET6) {
691 if (unlikely(inet6_match(net, esk,
692 &sk->sk_v6_daddr,
693 &sk->sk_v6_rcv_saddr,
694 ports, dif, sdif))) {
695 return true;
696 }
697 }
698#endif
699 }
700 return false;
701}
702
703/* Insert a socket into ehash, and eventually remove another one
704 * (The another one can be a SYN_RECV or TIMEWAIT)
705 * If an existing socket already exists, socket sk is not inserted,
706 * and sets found_dup_sk parameter to true.
707 */
708bool inet_ehash_insert(struct sock *sk, struct sock *osk, bool *found_dup_sk)
709{
710 struct inet_hashinfo *hashinfo = tcp_get_hashinfo(sk);
711 struct inet_ehash_bucket *head;
712 struct hlist_nulls_head *list;
713 spinlock_t *lock;
714 bool ret = true;
715
716 WARN_ON_ONCE(!sk_unhashed(sk));
717
718 sk->sk_hash = sk_ehashfn(sk);
719 head = inet_ehash_bucket(hashinfo, sk->sk_hash);
720 list = &head->chain;
721 lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
722
723 spin_lock(lock);
724 if (osk) {
725 WARN_ON_ONCE(sk->sk_hash != osk->sk_hash);
726 ret = sk_nulls_replace_node_init_rcu(osk, sk);
727 goto unlock;
728 }
729
730 if (found_dup_sk) {
731 *found_dup_sk = inet_ehash_lookup_by_sk(sk, list);
732 if (*found_dup_sk)
733 ret = false;
734 }
735
736 if (ret)
737 __sk_nulls_add_node_rcu(sk, list);
738
739unlock:
740 spin_unlock(lock);
741
742 return ret;
743}
744
745bool inet_ehash_nolisten(struct sock *sk, struct sock *osk, bool *found_dup_sk)
746{
747 bool ok = inet_ehash_insert(sk, osk, found_dup_sk);
748
749 if (ok) {
750 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
751 } else {
752 tcp_orphan_count_inc();
753 inet_sk_set_state(sk, TCP_CLOSE);
754 sock_set_flag(sk, SOCK_DEAD);
755 inet_csk_destroy_sock(sk);
756 }
757 return ok;
758}
759
760static int inet_reuseport_add_sock(struct sock *sk,
761 struct inet_listen_hashbucket *ilb)
762{
763 struct inet_bind_bucket *tb = inet_csk(sk)->icsk_bind_hash;
764 const struct hlist_nulls_node *node;
765 kuid_t uid = sk_uid(sk);
766 struct sock *sk2;
767
768 sk_nulls_for_each_rcu(sk2, node, &ilb->nulls_head) {
769 if (sk2 != sk &&
770 sk2->sk_family == sk->sk_family &&
771 ipv6_only_sock(sk2) == ipv6_only_sock(sk) &&
772 sk2->sk_bound_dev_if == sk->sk_bound_dev_if &&
773 inet_csk(sk2)->icsk_bind_hash == tb &&
774 sk2->sk_reuseport && uid_eq(uid, sk_uid(sk2)) &&
775 inet_rcv_saddr_equal(sk, sk2, false))
776 return reuseport_add_sock(sk, sk2,
777 inet_rcv_saddr_any(sk));
778 }
779
780 return reuseport_alloc(sk, inet_rcv_saddr_any(sk));
781}
782
783int inet_hash(struct sock *sk)
784{
785 struct inet_hashinfo *hashinfo = tcp_get_hashinfo(sk);
786 struct inet_listen_hashbucket *ilb2;
787 int err = 0;
788
789 if (sk->sk_state == TCP_CLOSE)
790 return 0;
791
792 if (sk->sk_state != TCP_LISTEN) {
793 local_bh_disable();
794 inet_ehash_nolisten(sk, NULL, NULL);
795 local_bh_enable();
796 return 0;
797 }
798
799#if IS_ENABLED(CONFIG_IPV6)
800 if (sk->sk_family == AF_INET6)
801 inet6_init_ehash_secret();
802#endif
803 inet_init_ehash_secret();
804
805 WARN_ON(!sk_unhashed(sk));
806 ilb2 = inet_lhash2_bucket_sk(hashinfo, sk);
807
808 spin_lock(&ilb2->lock);
809 if (sk->sk_reuseport) {
810 err = inet_reuseport_add_sock(sk, ilb2);
811 if (err)
812 goto unlock;
813 }
814 sock_set_flag(sk, SOCK_RCU_FREE);
815 if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
816 sk->sk_family == AF_INET6)
817 __sk_nulls_add_node_tail_rcu(sk, &ilb2->nulls_head);
818 else
819 __sk_nulls_add_node_rcu(sk, &ilb2->nulls_head);
820 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
821unlock:
822 spin_unlock(&ilb2->lock);
823
824 return err;
825}
826
827void inet_unhash(struct sock *sk)
828{
829 struct inet_hashinfo *hashinfo = tcp_get_hashinfo(sk);
830
831 if (sk_unhashed(sk))
832 return;
833
834 sock_rps_delete_flow(sk);
835 if (sk->sk_state == TCP_LISTEN) {
836 struct inet_listen_hashbucket *ilb2;
837
838 ilb2 = inet_lhash2_bucket_sk(hashinfo, sk);
839 /* Don't disable bottom halves while acquiring the lock to
840 * avoid circular locking dependency on PREEMPT_RT.
841 */
842 spin_lock(&ilb2->lock);
843 if (rcu_access_pointer(sk->sk_reuseport_cb))
844 reuseport_stop_listen_sock(sk);
845
846 __sk_nulls_del_node_init_rcu(sk);
847 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
848 spin_unlock(&ilb2->lock);
849 } else {
850 spinlock_t *lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
851
852 spin_lock_bh(lock);
853 __sk_nulls_del_node_init_rcu(sk);
854 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
855 spin_unlock_bh(lock);
856 }
857}
858
859static bool inet_bind2_bucket_match(const struct inet_bind2_bucket *tb,
860 const struct net *net, unsigned short port,
861 int l3mdev, const struct sock *sk)
862{
863 if (!net_eq(ib2_net(tb), net) || tb->port != port ||
864 tb->l3mdev != l3mdev)
865 return false;
866
867 return inet_bind2_bucket_addr_match(tb, sk);
868}
869
870bool inet_bind2_bucket_match_addr_any(const struct inet_bind2_bucket *tb, const struct net *net,
871 unsigned short port, int l3mdev, const struct sock *sk)
872{
873 if (!net_eq(ib2_net(tb), net) || tb->port != port ||
874 tb->l3mdev != l3mdev)
875 return false;
876
877#if IS_ENABLED(CONFIG_IPV6)
878 if (tb->addr_type == IPV6_ADDR_ANY)
879 return true;
880
881 if (tb->addr_type != IPV6_ADDR_MAPPED)
882 return false;
883
884 if (sk->sk_family == AF_INET6 &&
885 !ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
886 return false;
887#endif
888 return tb->rcv_saddr == 0;
889}
890
891/* The socket's bhash2 hashbucket spinlock must be held when this is called */
892struct inet_bind2_bucket *
893inet_bind2_bucket_find(const struct inet_bind_hashbucket *head, const struct net *net,
894 unsigned short port, int l3mdev, const struct sock *sk)
895{
896 struct inet_bind2_bucket *bhash2 = NULL;
897
898 inet_bind_bucket_for_each(bhash2, &head->chain)
899 if (inet_bind2_bucket_match(bhash2, net, port, l3mdev, sk))
900 break;
901
902 return bhash2;
903}
904
905struct inet_bind_hashbucket *
906inet_bhash2_addr_any_hashbucket(const struct sock *sk, const struct net *net, int port)
907{
908 struct inet_hashinfo *hinfo = tcp_get_hashinfo(sk);
909 u32 hash;
910
911#if IS_ENABLED(CONFIG_IPV6)
912 if (sk->sk_family == AF_INET6)
913 hash = ipv6_portaddr_hash(net, &in6addr_any, port);
914 else
915#endif
916 hash = ipv4_portaddr_hash(net, 0, port);
917
918 return &hinfo->bhash2[hash & (hinfo->bhash_size - 1)];
919}
920
921static void inet_update_saddr(struct sock *sk, void *saddr, int family)
922{
923 if (family == AF_INET) {
924 inet_sk(sk)->inet_saddr = *(__be32 *)saddr;
925 sk_rcv_saddr_set(sk, inet_sk(sk)->inet_saddr);
926 }
927#if IS_ENABLED(CONFIG_IPV6)
928 else {
929 sk->sk_v6_rcv_saddr = *(struct in6_addr *)saddr;
930 }
931#endif
932}
933
934static int __inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family, bool reset)
935{
936 struct inet_hashinfo *hinfo = tcp_get_hashinfo(sk);
937 struct inet_bind_hashbucket *head, *head2;
938 struct inet_bind2_bucket *tb2, *new_tb2;
939 int l3mdev = inet_sk_bound_l3mdev(sk);
940 int port = inet_sk(sk)->inet_num;
941 struct net *net = sock_net(sk);
942 int bhash;
943
944 if (!inet_csk(sk)->icsk_bind2_hash) {
945 /* Not bind()ed before. */
946 if (reset)
947 inet_reset_saddr(sk);
948 else
949 inet_update_saddr(sk, saddr, family);
950
951 return 0;
952 }
953
954 /* Allocate a bind2 bucket ahead of time to avoid permanently putting
955 * the bhash2 table in an inconsistent state if a new tb2 bucket
956 * allocation fails.
957 */
958 new_tb2 = kmem_cache_alloc(hinfo->bind2_bucket_cachep, GFP_ATOMIC);
959 if (!new_tb2) {
960 if (reset) {
961 /* The (INADDR_ANY, port) bucket might have already
962 * been freed, then we cannot fixup icsk_bind2_hash,
963 * so we give up and unlink sk from bhash/bhash2 not
964 * to leave inconsistency in bhash2.
965 */
966 inet_put_port(sk);
967 inet_reset_saddr(sk);
968 }
969
970 return -ENOMEM;
971 }
972
973 bhash = inet_bhashfn(net, port, hinfo->bhash_size);
974 head = &hinfo->bhash[bhash];
975 head2 = inet_bhashfn_portaddr(hinfo, sk, net, port);
976
977 /* If we change saddr locklessly, another thread
978 * iterating over bhash might see corrupted address.
979 */
980 spin_lock_bh(&head->lock);
981
982 spin_lock(&head2->lock);
983 __sk_del_bind_node(sk);
984 inet_bind2_bucket_destroy(hinfo->bind2_bucket_cachep, inet_csk(sk)->icsk_bind2_hash);
985 spin_unlock(&head2->lock);
986
987 if (reset)
988 inet_reset_saddr(sk);
989 else
990 inet_update_saddr(sk, saddr, family);
991
992 head2 = inet_bhashfn_portaddr(hinfo, sk, net, port);
993
994 spin_lock(&head2->lock);
995 tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, sk);
996 if (!tb2) {
997 tb2 = new_tb2;
998 inet_bind2_bucket_init(tb2, net, head2, inet_csk(sk)->icsk_bind_hash, sk);
999 if (sk_is_connect_bind(sk)) {
1000 tb2->fastreuse = -1;
1001 tb2->fastreuseport = -1;
1002 }
1003 }
1004 inet_csk(sk)->icsk_bind2_hash = tb2;
1005 sk_add_bind_node(sk, &tb2->owners);
1006 spin_unlock(&head2->lock);
1007
1008 spin_unlock_bh(&head->lock);
1009
1010 if (tb2 != new_tb2)
1011 kmem_cache_free(hinfo->bind2_bucket_cachep, new_tb2);
1012
1013 return 0;
1014}
1015
1016int inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family)
1017{
1018 return __inet_bhash2_update_saddr(sk, saddr, family, false);
1019}
1020
1021void inet_bhash2_reset_saddr(struct sock *sk)
1022{
1023 if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
1024 __inet_bhash2_update_saddr(sk, NULL, 0, true);
1025}
1026
1027/* RFC 6056 3.3.4. Algorithm 4: Double-Hash Port Selection Algorithm
1028 * Note that we use 32bit integers (vs RFC 'short integers')
1029 * because 2^16 is not a multiple of num_ephemeral and this
1030 * property might be used by clever attacker.
1031 *
1032 * RFC claims using TABLE_LENGTH=10 buckets gives an improvement, though
1033 * attacks were since demonstrated, thus we use 65536 by default instead
1034 * to really give more isolation and privacy, at the expense of 256kB
1035 * of kernel memory.
1036 */
1037#define INET_TABLE_PERTURB_SIZE (1 << CONFIG_INET_TABLE_PERTURB_ORDER)
1038static u32 *table_perturb;
1039
1040int __inet_hash_connect(struct inet_timewait_death_row *death_row,
1041 struct sock *sk, u64 port_offset,
1042 u32 hash_port0,
1043 int (*check_established)(struct inet_timewait_death_row *,
1044 struct sock *, __u16, struct inet_timewait_sock **,
1045 bool rcu_lookup, u32 hash))
1046{
1047 struct inet_hashinfo *hinfo = death_row->hashinfo;
1048 struct inet_bind_hashbucket *head, *head2;
1049 struct inet_timewait_sock *tw = NULL;
1050 int port = inet_sk(sk)->inet_num;
1051 struct net *net = sock_net(sk);
1052 struct inet_bind2_bucket *tb2;
1053 struct inet_bind_bucket *tb;
1054 int step, scan_step, l3mdev;
1055 u32 index, max_rand_step;
1056 bool tb_created = false;
1057 u32 remaining, offset;
1058 int ret, i, low, high;
1059 bool local_ports;
1060
1061 if (port) {
1062 local_bh_disable();
1063 ret = check_established(death_row, sk, port, NULL, false,
1064 hash_port0 + port);
1065 local_bh_enable();
1066 return ret;
1067 }
1068
1069 l3mdev = inet_sk_bound_l3mdev(sk);
1070
1071 local_ports = inet_sk_get_local_port_range(sk, &low, &high);
1072 step = local_ports ? 1 : 2;
1073 scan_step = step;
1074 max_rand_step = READ_ONCE(net->ipv4.sysctl_ip_local_port_step_width);
1075
1076 high++; /* [32768, 60999] -> [32768, 61000[ */
1077 remaining = high - low;
1078 if (!local_ports && remaining > 1)
1079 remaining &= ~1U;
1080
1081 get_random_sleepable_once(table_perturb,
1082 INET_TABLE_PERTURB_SIZE * sizeof(*table_perturb));
1083 index = port_offset & (INET_TABLE_PERTURB_SIZE - 1);
1084
1085 offset = READ_ONCE(table_perturb[index]) + (port_offset >> 32);
1086 offset %= remaining;
1087
1088 /* In first pass we try ports of @low parity.
1089 * inet_csk_get_port() does the opposite choice.
1090 */
1091 if (!local_ports)
1092 offset &= ~1U;
1093
1094 if (max_rand_step && remaining > 1) {
1095 u32 range = remaining / step;
1096 u32 upper_bound;
1097
1098 upper_bound = min(range, max_rand_step);
1099 scan_step = get_random_u32_inclusive(1, upper_bound);
1100 while (gcd(scan_step, range) != 1) {
1101 scan_step++;
1102 /* if both scan_step and range are even gcd won't be 1 */
1103 if (!(scan_step & 1) && !(range & 1))
1104 scan_step++;
1105 if (unlikely(scan_step > upper_bound)) {
1106 scan_step = 1;
1107 break;
1108 }
1109 }
1110 scan_step *= step;
1111 }
1112other_parity_scan:
1113 port = low + offset;
1114 for (i = 0; i < remaining; i += step, port += scan_step) {
1115 if (unlikely(port >= high))
1116 port -= remaining;
1117 if (inet_is_local_reserved_port(net, port))
1118 continue;
1119 head = &hinfo->bhash[inet_bhashfn(net, port,
1120 hinfo->bhash_size)];
1121 rcu_read_lock();
1122 hlist_for_each_entry_rcu(tb, &head->chain, node) {
1123 if (!inet_bind_bucket_match(tb, net, port, l3mdev))
1124 continue;
1125 if (tb->fastreuse >= 0 || tb->fastreuseport >= 0) {
1126 rcu_read_unlock();
1127 goto next_port;
1128 }
1129 if (!check_established(death_row, sk, port, &tw, true,
1130 hash_port0 + port))
1131 break;
1132 rcu_read_unlock();
1133 goto next_port;
1134 }
1135 rcu_read_unlock();
1136
1137 spin_lock_bh(&head->lock);
1138
1139 /* Does not bother with rcv_saddr checks, because
1140 * the established check is already unique enough.
1141 */
1142 inet_bind_bucket_for_each(tb, &head->chain) {
1143 if (inet_bind_bucket_match(tb, net, port, l3mdev)) {
1144 if (tb->fastreuse >= 0 ||
1145 tb->fastreuseport >= 0)
1146 goto next_port_unlock;
1147 WARN_ON(hlist_empty(&tb->bhash2));
1148 if (!check_established(death_row, sk,
1149 port, &tw, false,
1150 hash_port0 + port))
1151 goto ok;
1152 goto next_port_unlock;
1153 }
1154 }
1155
1156 tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
1157 net, head, port, l3mdev);
1158 if (!tb) {
1159 spin_unlock_bh(&head->lock);
1160 return -ENOMEM;
1161 }
1162 tb_created = true;
1163 tb->fastreuse = -1;
1164 tb->fastreuseport = -1;
1165 goto ok;
1166next_port_unlock:
1167 spin_unlock_bh(&head->lock);
1168next_port:
1169 cond_resched();
1170 }
1171
1172 if (!local_ports) {
1173 offset++;
1174 if ((offset & 1) && remaining > 1)
1175 goto other_parity_scan;
1176 }
1177 return -EADDRNOTAVAIL;
1178
1179ok:
1180 /* Find the corresponding tb2 bucket since we need to
1181 * add the socket to the bhash2 table as well
1182 */
1183 head2 = inet_bhashfn_portaddr(hinfo, sk, net, port);
1184 spin_lock(&head2->lock);
1185
1186 tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, sk);
1187 if (!tb2) {
1188 tb2 = inet_bind2_bucket_create(hinfo->bind2_bucket_cachep, net,
1189 head2, tb, sk);
1190 if (!tb2)
1191 goto error;
1192 tb2->fastreuse = -1;
1193 tb2->fastreuseport = -1;
1194 }
1195
1196 /* Here we want to add a little bit of randomness to the next source
1197 * port that will be chosen. We use a max() with a random here so that
1198 * on low contention the randomness is maximal and on high contention
1199 * it may be inexistent.
1200 */
1201 i = max_t(int, i, get_random_u32_below(8) * step);
1202 WRITE_ONCE(table_perturb[index], READ_ONCE(table_perturb[index]) + i + step);
1203
1204 /* Head lock still held and bh's disabled */
1205 inet_bind_hash(sk, tb, tb2, port);
1206 sk->sk_userlocks |= SOCK_CONNECT_BIND;
1207
1208 if (sk_unhashed(sk)) {
1209 inet_sk(sk)->inet_sport = htons(port);
1210 inet_ehash_nolisten(sk, (struct sock *)tw, NULL);
1211 }
1212 if (tw)
1213 inet_twsk_bind_unhash(tw, hinfo);
1214
1215 spin_unlock(&head2->lock);
1216 spin_unlock(&head->lock);
1217
1218 if (tw)
1219 inet_twsk_deschedule_put(tw);
1220 local_bh_enable();
1221 return 0;
1222
1223error:
1224 if (sk_hashed(sk)) {
1225 spinlock_t *lock = inet_ehash_lockp(hinfo, sk->sk_hash);
1226
1227 sock_prot_inuse_add(net, sk->sk_prot, -1);
1228
1229 spin_lock(lock);
1230 __sk_nulls_del_node_init_rcu(sk);
1231 spin_unlock(lock);
1232
1233 sk->sk_hash = 0;
1234 inet_sk(sk)->inet_sport = 0;
1235 WRITE_ONCE(inet_sk(sk)->inet_num, 0);
1236
1237 if (tw)
1238 inet_twsk_bind_unhash(tw, hinfo);
1239 }
1240
1241 spin_unlock(&head2->lock);
1242 if (tb_created)
1243 inet_bind_bucket_destroy(tb);
1244 spin_unlock(&head->lock);
1245
1246 if (tw)
1247 inet_twsk_deschedule_put(tw);
1248
1249 local_bh_enable();
1250
1251 return -ENOMEM;
1252}
1253
1254/*
1255 * Bind a port for a connect operation and hash it.
1256 */
1257int inet_hash_connect(struct inet_timewait_death_row *death_row,
1258 struct sock *sk)
1259{
1260 const struct inet_sock *inet = inet_sk(sk);
1261 const struct net *net = sock_net(sk);
1262 u64 port_offset = 0;
1263 u32 hash_port0;
1264
1265 if (!inet_sk(sk)->inet_num)
1266 port_offset = inet_sk_port_offset(sk);
1267
1268 inet_init_ehash_secret();
1269
1270 hash_port0 = inet_ehashfn(net, inet->inet_rcv_saddr, 0,
1271 inet->inet_daddr, inet->inet_dport);
1272
1273 return __inet_hash_connect(death_row, sk, port_offset, hash_port0,
1274 __inet_check_established);
1275}
1276
1277void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
1278 unsigned long numentries, int scale,
1279 unsigned long low_limit,
1280 unsigned long high_limit)
1281{
1282 unsigned int i;
1283
1284 h->lhash2 = alloc_large_system_hash(name,
1285 sizeof(*h->lhash2),
1286 numentries,
1287 scale,
1288 0,
1289 NULL,
1290 &h->lhash2_mask,
1291 low_limit,
1292 high_limit);
1293
1294 for (i = 0; i <= h->lhash2_mask; i++) {
1295 spin_lock_init(&h->lhash2[i].lock);
1296 INIT_HLIST_NULLS_HEAD(&h->lhash2[i].nulls_head,
1297 i + LISTENING_NULLS_BASE);
1298 }
1299
1300 /* this one is used for source ports of outgoing connections */
1301 table_perturb = alloc_large_system_hash("Table-perturb",
1302 sizeof(*table_perturb),
1303 INET_TABLE_PERTURB_SIZE,
1304 0, 0, NULL, NULL,
1305 INET_TABLE_PERTURB_SIZE,
1306 INET_TABLE_PERTURB_SIZE);
1307}
1308
1309int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
1310{
1311 unsigned int locksz = sizeof(spinlock_t);
1312 unsigned int i, nblocks = 1;
1313 spinlock_t *ptr = NULL;
1314
1315 if (locksz == 0)
1316 goto set_mask;
1317
1318 /* Allocate 2 cache lines or at least one spinlock per cpu. */
1319 nblocks = max(2U * L1_CACHE_BYTES / locksz, 1U) * num_possible_cpus();
1320
1321 /* At least one page per NUMA node. */
1322 nblocks = max(nblocks, num_online_nodes() * PAGE_SIZE / locksz);
1323
1324 nblocks = roundup_pow_of_two(nblocks);
1325
1326 /* No more locks than number of hash buckets. */
1327 nblocks = min(nblocks, hashinfo->ehash_mask + 1);
1328
1329 if (num_online_nodes() > 1) {
1330 /* Use vmalloc() to allow NUMA policy to spread pages
1331 * on all available nodes if desired.
1332 */
1333 ptr = vmalloc_array(nblocks, locksz);
1334 }
1335 if (!ptr) {
1336 ptr = kvmalloc_array(nblocks, locksz, GFP_KERNEL);
1337 if (!ptr)
1338 return -ENOMEM;
1339 }
1340 for (i = 0; i < nblocks; i++)
1341 spin_lock_init(&ptr[i]);
1342 hashinfo->ehash_locks = ptr;
1343set_mask:
1344 hashinfo->ehash_locks_mask = nblocks - 1;
1345 return 0;
1346}
1347
1348struct inet_hashinfo *inet_pernet_hashinfo_alloc(struct inet_hashinfo *hashinfo,
1349 unsigned int ehash_entries)
1350{
1351 struct inet_hashinfo *new_hashinfo;
1352 int i;
1353
1354 new_hashinfo = kmemdup(hashinfo, sizeof(*hashinfo), GFP_KERNEL);
1355 if (!new_hashinfo)
1356 goto err;
1357
1358 new_hashinfo->ehash = vmalloc_huge(ehash_entries * sizeof(struct inet_ehash_bucket),
1359 GFP_KERNEL_ACCOUNT);
1360 if (!new_hashinfo->ehash)
1361 goto free_hashinfo;
1362
1363 new_hashinfo->ehash_mask = ehash_entries - 1;
1364
1365 if (inet_ehash_locks_alloc(new_hashinfo))
1366 goto free_ehash;
1367
1368 for (i = 0; i < ehash_entries; i++)
1369 INIT_HLIST_NULLS_HEAD(&new_hashinfo->ehash[i].chain, i);
1370
1371 new_hashinfo->pernet = true;
1372
1373 return new_hashinfo;
1374
1375free_ehash:
1376 vfree(new_hashinfo->ehash);
1377free_hashinfo:
1378 kfree(new_hashinfo);
1379err:
1380 return NULL;
1381}
1382
1383void inet_pernet_hashinfo_free(struct inet_hashinfo *hashinfo)
1384{
1385 if (!hashinfo->pernet)
1386 return;
1387
1388 inet_ehash_locks_free(hashinfo);
1389 vfree(hashinfo->ehash);
1390 kfree(hashinfo);
1391}