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
20#include <net/addrconf.h>
21#include <net/inet_connection_sock.h>
22#include <net/inet_hashtables.h>
23#if IS_ENABLED(CONFIG_IPV6)
24#include <net/inet6_hashtables.h>
25#endif
26#include <net/hotdata.h>
27#include <net/ip.h>
28#include <net/rps.h>
29#include <net/secure_seq.h>
30#include <net/sock_reuseport.h>
31#include <net/tcp.h>
32
33u32 inet_ehashfn(const struct net *net, const __be32 laddr,
34 const __u16 lport, const __be32 faddr,
35 const __be16 fport)
36{
37 net_get_random_once(&inet_ehash_secret, sizeof(inet_ehash_secret));
38
39 return lport + __inet_ehashfn(laddr, lport: 0, faddr, fport,
40 inet_ehash_secret + net_hash_mix(net));
41}
42EXPORT_SYMBOL_GPL(inet_ehashfn);
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(a: &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
61static bool sk_is_connect_bind(const struct sock *sk)
62{
63 if (sk->sk_state == TCP_TIME_WAIT)
64 return inet_twsk(sk)->tw_connect_bind;
65 else
66 return sk->sk_userlocks & SOCK_CONNECT_BIND;
67}
68
69/*
70 * Allocate and initialize a new local port bind bucket.
71 * The bindhash mutex for snum's hash chain must be held here.
72 */
73struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
74 struct net *net,
75 struct inet_bind_hashbucket *head,
76 const unsigned short snum,
77 int l3mdev)
78{
79 struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
80
81 if (tb) {
82 write_pnet(pnet: &tb->ib_net, net);
83 tb->l3mdev = l3mdev;
84 tb->port = snum;
85 tb->fastreuse = 0;
86 tb->fastreuseport = 0;
87 INIT_HLIST_HEAD(&tb->bhash2);
88 hlist_add_head_rcu(n: &tb->node, h: &head->chain);
89 }
90 return tb;
91}
92
93/*
94 * Caller must hold hashbucket lock for this tb with local BH disabled
95 */
96void inet_bind_bucket_destroy(struct inet_bind_bucket *tb)
97{
98 const struct inet_bind2_bucket *tb2;
99
100 if (hlist_empty(h: &tb->bhash2)) {
101 hlist_del_rcu(n: &tb->node);
102 kfree_rcu(tb, rcu);
103 return;
104 }
105
106 if (tb->fastreuse == -1 && tb->fastreuseport == -1)
107 return;
108 hlist_for_each_entry(tb2, &tb->bhash2, bhash_node) {
109 if (tb2->fastreuse != -1 || tb2->fastreuseport != -1)
110 return;
111 }
112 tb->fastreuse = -1;
113 tb->fastreuseport = -1;
114}
115
116bool inet_bind_bucket_match(const struct inet_bind_bucket *tb, const struct net *net,
117 unsigned short port, int l3mdev)
118{
119 return net_eq(net1: ib_net(ib: tb), net2: net) && tb->port == port &&
120 tb->l3mdev == l3mdev;
121}
122
123static void inet_bind2_bucket_init(struct inet_bind2_bucket *tb2,
124 struct net *net,
125 struct inet_bind_hashbucket *head,
126 struct inet_bind_bucket *tb,
127 const struct sock *sk)
128{
129 write_pnet(pnet: &tb2->ib_net, net);
130 tb2->l3mdev = tb->l3mdev;
131 tb2->port = tb->port;
132#if IS_ENABLED(CONFIG_IPV6)
133 BUILD_BUG_ON(USHRT_MAX < (IPV6_ADDR_ANY | IPV6_ADDR_MAPPED));
134 if (sk->sk_family == AF_INET6) {
135 tb2->addr_type = ipv6_addr_type(addr: &sk->sk_v6_rcv_saddr);
136 tb2->v6_rcv_saddr = sk->sk_v6_rcv_saddr;
137 } else {
138 tb2->addr_type = IPV6_ADDR_MAPPED;
139 ipv6_addr_set_v4mapped(addr: sk->sk_rcv_saddr, v4mapped: &tb2->v6_rcv_saddr);
140 }
141#else
142 tb2->rcv_saddr = sk->sk_rcv_saddr;
143#endif
144 tb2->fastreuse = 0;
145 tb2->fastreuseport = 0;
146 INIT_HLIST_HEAD(&tb2->owners);
147 hlist_add_head(n: &tb2->node, h: &head->chain);
148 hlist_add_head(n: &tb2->bhash_node, h: &tb->bhash2);
149}
150
151struct inet_bind2_bucket *inet_bind2_bucket_create(struct kmem_cache *cachep,
152 struct net *net,
153 struct inet_bind_hashbucket *head,
154 struct inet_bind_bucket *tb,
155 const struct sock *sk)
156{
157 struct inet_bind2_bucket *tb2 = kmem_cache_alloc(cachep, GFP_ATOMIC);
158
159 if (tb2)
160 inet_bind2_bucket_init(tb2, net, head, tb, sk);
161
162 return tb2;
163}
164
165/* Caller must hold hashbucket lock for this tb with local BH disabled */
166void inet_bind2_bucket_destroy(struct kmem_cache *cachep, struct inet_bind2_bucket *tb)
167{
168 const struct sock *sk;
169
170 if (hlist_empty(h: &tb->owners)) {
171 __hlist_del(n: &tb->node);
172 __hlist_del(n: &tb->bhash_node);
173 kmem_cache_free(s: cachep, objp: tb);
174 return;
175 }
176
177 if (tb->fastreuse == -1 && tb->fastreuseport == -1)
178 return;
179 sk_for_each_bound(sk, &tb->owners) {
180 if (!sk_is_connect_bind(sk))
181 return;
182 }
183 tb->fastreuse = -1;
184 tb->fastreuseport = -1;
185}
186
187static bool inet_bind2_bucket_addr_match(const struct inet_bind2_bucket *tb2,
188 const struct sock *sk)
189{
190#if IS_ENABLED(CONFIG_IPV6)
191 if (sk->sk_family == AF_INET6)
192 return ipv6_addr_equal(a1: &tb2->v6_rcv_saddr, a2: &sk->sk_v6_rcv_saddr);
193
194 if (tb2->addr_type != IPV6_ADDR_MAPPED)
195 return false;
196#endif
197 return tb2->rcv_saddr == sk->sk_rcv_saddr;
198}
199
200void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
201 struct inet_bind2_bucket *tb2, unsigned short port)
202{
203 inet_sk(sk)->inet_num = port;
204 inet_csk(sk)->icsk_bind_hash = tb;
205 inet_csk(sk)->icsk_bind2_hash = tb2;
206 sk_add_bind_node(sk, list: &tb2->owners);
207}
208
209/*
210 * Get rid of any references to a local port held by the given sock.
211 */
212static void __inet_put_port(struct sock *sk)
213{
214 struct inet_hashinfo *hashinfo = tcp_get_hashinfo(sk);
215 struct inet_bind_hashbucket *head, *head2;
216 struct net *net = sock_net(sk);
217 struct inet_bind_bucket *tb;
218 int bhash;
219
220 bhash = inet_bhashfn(net, inet_sk(sk)->inet_num, bhash_size: hashinfo->bhash_size);
221 head = &hashinfo->bhash[bhash];
222 head2 = inet_bhashfn_portaddr(hinfo: hashinfo, sk, net, inet_sk(sk)->inet_num);
223
224 spin_lock(lock: &head->lock);
225 tb = inet_csk(sk)->icsk_bind_hash;
226 inet_csk(sk)->icsk_bind_hash = NULL;
227 inet_sk(sk)->inet_num = 0;
228 sk->sk_userlocks &= ~SOCK_CONNECT_BIND;
229
230 spin_lock(lock: &head2->lock);
231 if (inet_csk(sk)->icsk_bind2_hash) {
232 struct inet_bind2_bucket *tb2 = inet_csk(sk)->icsk_bind2_hash;
233
234 __sk_del_bind_node(sk);
235 inet_csk(sk)->icsk_bind2_hash = NULL;
236 inet_bind2_bucket_destroy(cachep: hashinfo->bind2_bucket_cachep, tb: tb2);
237 }
238 spin_unlock(lock: &head2->lock);
239
240 inet_bind_bucket_destroy(tb);
241 spin_unlock(lock: &head->lock);
242}
243
244void inet_put_port(struct sock *sk)
245{
246 local_bh_disable();
247 __inet_put_port(sk);
248 local_bh_enable();
249}
250EXPORT_SYMBOL(inet_put_port);
251
252int __inet_inherit_port(const struct sock *sk, struct sock *child)
253{
254 struct inet_hashinfo *table = tcp_get_hashinfo(sk);
255 unsigned short port = inet_sk(child)->inet_num;
256 struct inet_bind_hashbucket *head, *head2;
257 bool created_inet_bind_bucket = false;
258 struct net *net = sock_net(sk);
259 bool update_fastreuse = false;
260 struct inet_bind2_bucket *tb2;
261 struct inet_bind_bucket *tb;
262 int bhash, l3mdev;
263
264 bhash = inet_bhashfn(net, lport: port, bhash_size: table->bhash_size);
265 head = &table->bhash[bhash];
266 head2 = inet_bhashfn_portaddr(hinfo: table, sk: child, net, port);
267
268 spin_lock(lock: &head->lock);
269 spin_lock(lock: &head2->lock);
270 tb = inet_csk(sk)->icsk_bind_hash;
271 tb2 = inet_csk(sk)->icsk_bind2_hash;
272 if (unlikely(!tb || !tb2)) {
273 spin_unlock(lock: &head2->lock);
274 spin_unlock(lock: &head->lock);
275 return -ENOENT;
276 }
277 if (tb->port != port) {
278 l3mdev = inet_sk_bound_l3mdev(sk);
279
280 /* NOTE: using tproxy and redirecting skbs to a proxy
281 * on a different listener port breaks the assumption
282 * that the listener socket's icsk_bind_hash is the same
283 * as that of the child socket. We have to look up or
284 * create a new bind bucket for the child here. */
285 inet_bind_bucket_for_each(tb, &head->chain) {
286 if (inet_bind_bucket_match(tb, net, port, l3mdev))
287 break;
288 }
289 if (!tb) {
290 tb = inet_bind_bucket_create(cachep: table->bind_bucket_cachep,
291 net, head, snum: port, l3mdev);
292 if (!tb) {
293 spin_unlock(lock: &head2->lock);
294 spin_unlock(lock: &head->lock);
295 return -ENOMEM;
296 }
297 created_inet_bind_bucket = true;
298 }
299 update_fastreuse = true;
300
301 goto bhash2_find;
302 } else if (!inet_bind2_bucket_addr_match(tb2, sk: child)) {
303 l3mdev = inet_sk_bound_l3mdev(sk);
304
305bhash2_find:
306 tb2 = inet_bind2_bucket_find(head: head2, net, port, l3mdev, sk: child);
307 if (!tb2) {
308 tb2 = inet_bind2_bucket_create(cachep: table->bind2_bucket_cachep,
309 net, head: head2, tb, sk: child);
310 if (!tb2)
311 goto error;
312 }
313 }
314 if (update_fastreuse)
315 inet_csk_update_fastreuse(sk: child, tb, tb2);
316 inet_bind_hash(sk: child, tb, tb2, port);
317 spin_unlock(lock: &head2->lock);
318 spin_unlock(lock: &head->lock);
319
320 return 0;
321
322error:
323 if (created_inet_bind_bucket)
324 inet_bind_bucket_destroy(tb);
325 spin_unlock(lock: &head2->lock);
326 spin_unlock(lock: &head->lock);
327 return -ENOMEM;
328}
329EXPORT_SYMBOL_GPL(__inet_inherit_port);
330
331static struct inet_listen_hashbucket *
332inet_lhash2_bucket_sk(struct inet_hashinfo *h, struct sock *sk)
333{
334 u32 hash;
335
336#if IS_ENABLED(CONFIG_IPV6)
337 if (sk->sk_family == AF_INET6)
338 hash = ipv6_portaddr_hash(net: sock_net(sk),
339 addr6: &sk->sk_v6_rcv_saddr,
340 inet_sk(sk)->inet_num);
341 else
342#endif
343 hash = ipv4_portaddr_hash(net: sock_net(sk),
344 inet_sk(sk)->inet_rcv_saddr,
345 inet_sk(sk)->inet_num);
346 return inet_lhash2_bucket(h, hash);
347}
348
349static inline int compute_score(struct sock *sk, const struct net *net,
350 const unsigned short hnum, const __be32 daddr,
351 const int dif, const int sdif)
352{
353 int score = -1;
354
355 if (net_eq(net1: sock_net(sk), net2: net) && sk->sk_num == hnum &&
356 !ipv6_only_sock(sk)) {
357 if (sk->sk_rcv_saddr != daddr)
358 return -1;
359
360 if (!inet_sk_bound_dev_eq(net, bound_dev_if: sk->sk_bound_dev_if, dif, sdif))
361 return -1;
362 score = sk->sk_bound_dev_if ? 2 : 1;
363
364 if (sk->sk_family == PF_INET)
365 score++;
366 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
367 score++;
368 }
369 return score;
370}
371
372/**
373 * inet_lookup_reuseport() - execute reuseport logic on AF_INET socket if necessary.
374 * @net: network namespace.
375 * @sk: AF_INET socket, must be in TCP_LISTEN state for TCP or TCP_CLOSE for UDP.
376 * @skb: context for a potential SK_REUSEPORT program.
377 * @doff: header offset.
378 * @saddr: source address.
379 * @sport: source port.
380 * @daddr: destination address.
381 * @hnum: destination port in host byte order.
382 * @ehashfn: hash function used to generate the fallback hash.
383 *
384 * Return: NULL if sk doesn't have SO_REUSEPORT set, otherwise a pointer to
385 * the selected sock or an error.
386 */
387struct sock *inet_lookup_reuseport(const struct net *net, struct sock *sk,
388 struct sk_buff *skb, int doff,
389 __be32 saddr, __be16 sport,
390 __be32 daddr, unsigned short hnum,
391 inet_ehashfn_t *ehashfn)
392{
393 struct sock *reuse_sk = NULL;
394 u32 phash;
395
396 if (sk->sk_reuseport) {
397 phash = INDIRECT_CALL_2(ehashfn, udp_ehashfn, inet_ehashfn,
398 net, daddr, hnum, saddr, sport);
399 reuse_sk = reuseport_select_sock(sk, hash: phash, skb, hdr_len: doff);
400 }
401 return reuse_sk;
402}
403EXPORT_SYMBOL_GPL(inet_lookup_reuseport);
404
405/*
406 * Here are some nice properties to exploit here. The BSD API
407 * does not allow a listening sock to specify the remote port nor the
408 * remote address for the connection. So always assume those are both
409 * wildcarded during the search since they can never be otherwise.
410 */
411
412/* called with rcu_read_lock() : No refcount taken on the socket */
413static struct sock *inet_lhash2_lookup(const struct net *net,
414 struct inet_listen_hashbucket *ilb2,
415 struct sk_buff *skb, int doff,
416 const __be32 saddr, __be16 sport,
417 const __be32 daddr, const unsigned short hnum,
418 const int dif, const int sdif)
419{
420 struct sock *sk, *result = NULL;
421 struct hlist_nulls_node *node;
422 int score, hiscore = 0;
423
424 sk_nulls_for_each_rcu(sk, node, &ilb2->nulls_head) {
425 score = compute_score(sk, net, hnum, daddr, dif, sdif);
426 if (score > hiscore) {
427 result = inet_lookup_reuseport(net, sk, skb, doff,
428 saddr, sport, daddr, hnum, inet_ehashfn);
429 if (result)
430 return result;
431
432 result = sk;
433 hiscore = score;
434 }
435 }
436
437 return result;
438}
439
440struct sock *inet_lookup_run_sk_lookup(const struct net *net,
441 int protocol,
442 struct sk_buff *skb, int doff,
443 __be32 saddr, __be16 sport,
444 __be32 daddr, u16 hnum, const int dif,
445 inet_ehashfn_t *ehashfn)
446{
447 struct sock *sk, *reuse_sk;
448 bool no_reuseport;
449
450 no_reuseport = bpf_sk_lookup_run_v4(net, protocol, saddr, sport,
451 daddr, dport: hnum, ifindex: dif, psk: &sk);
452 if (no_reuseport || IS_ERR_OR_NULL(ptr: sk))
453 return sk;
454
455 reuse_sk = inet_lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum,
456 ehashfn);
457 if (reuse_sk)
458 sk = reuse_sk;
459 return sk;
460}
461
462struct sock *__inet_lookup_listener(const struct net *net,
463 struct sk_buff *skb, int doff,
464 const __be32 saddr, __be16 sport,
465 const __be32 daddr, const unsigned short hnum,
466 const int dif, const int sdif)
467{
468 struct inet_listen_hashbucket *ilb2;
469 struct inet_hashinfo *hashinfo;
470 struct sock *result = NULL;
471 unsigned int hash2;
472
473 /* Lookup redirect from BPF */
474 if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
475 result = inet_lookup_run_sk_lookup(net, IPPROTO_TCP, skb, doff,
476 saddr, sport, daddr, hnum, dif,
477 ehashfn: inet_ehashfn);
478 if (result)
479 goto done;
480 }
481
482 hashinfo = net->ipv4.tcp_death_row.hashinfo;
483 hash2 = ipv4_portaddr_hash(net, saddr: daddr, port: hnum);
484 ilb2 = inet_lhash2_bucket(h: hashinfo, hash: hash2);
485
486 result = inet_lhash2_lookup(net, ilb2, skb, doff,
487 saddr, sport, daddr, hnum,
488 dif, sdif);
489 if (result)
490 goto done;
491
492 /* Lookup lhash2 with INADDR_ANY */
493 hash2 = ipv4_portaddr_hash(net, htonl(INADDR_ANY), port: hnum);
494 ilb2 = inet_lhash2_bucket(h: hashinfo, hash: hash2);
495
496 result = inet_lhash2_lookup(net, ilb2, skb, doff,
497 saddr, sport, htonl(INADDR_ANY), hnum,
498 dif, sdif);
499done:
500 if (IS_ERR(ptr: result))
501 return NULL;
502 return result;
503}
504EXPORT_SYMBOL_GPL(__inet_lookup_listener);
505
506/* All sockets share common refcount, but have different destructors */
507void sock_gen_put(struct sock *sk)
508{
509 if (!refcount_dec_and_test(r: &sk->sk_refcnt))
510 return;
511
512 if (sk->sk_state == TCP_TIME_WAIT)
513 inet_twsk_free(tw: inet_twsk(sk));
514 else if (sk->sk_state == TCP_NEW_SYN_RECV)
515 reqsk_free(req: inet_reqsk(sk));
516 else
517 sk_free(sk);
518}
519EXPORT_SYMBOL_GPL(sock_gen_put);
520
521void sock_edemux(struct sk_buff *skb)
522{
523 sock_gen_put(skb->sk);
524}
525EXPORT_SYMBOL(sock_edemux);
526
527struct sock *__inet_lookup_established(const struct net *net,
528 const __be32 saddr, const __be16 sport,
529 const __be32 daddr, const u16 hnum,
530 const int dif, const int sdif)
531{
532 const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
533 INET_ADDR_COOKIE(acookie, saddr, daddr);
534 const struct hlist_nulls_node *node;
535 struct inet_ehash_bucket *head;
536 struct inet_hashinfo *hashinfo;
537 unsigned int hash, slot;
538 struct sock *sk;
539
540 hashinfo = net->ipv4.tcp_death_row.hashinfo;
541 hash = inet_ehashfn(net, daddr, hnum, saddr, sport);
542 slot = hash & hashinfo->ehash_mask;
543 head = &hashinfo->ehash[slot];
544
545begin:
546 sk_nulls_for_each_rcu(sk, node, &head->chain) {
547 if (sk->sk_hash != hash)
548 continue;
549 if (likely(inet_match(net, sk, acookie, ports, dif, sdif))) {
550 if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
551 goto out;
552 if (unlikely(!inet_match(net, sk, acookie,
553 ports, dif, sdif))) {
554 sock_gen_put(sk);
555 goto begin;
556 }
557 goto found;
558 }
559 }
560 /*
561 * if the nulls value we got at the end of this lookup is
562 * not the expected one, we must restart lookup.
563 * We probably met an item that was moved to another chain.
564 */
565 if (get_nulls_value(ptr: node) != slot)
566 goto begin;
567out:
568 sk = NULL;
569found:
570 return sk;
571}
572EXPORT_SYMBOL_GPL(__inet_lookup_established);
573
574/* called with local bh disabled */
575static int __inet_check_established(struct inet_timewait_death_row *death_row,
576 struct sock *sk, __u16 lport,
577 struct inet_timewait_sock **twp,
578 bool rcu_lookup,
579 u32 hash)
580{
581 struct inet_hashinfo *hinfo = death_row->hashinfo;
582 struct inet_sock *inet = inet_sk(sk);
583 __be32 daddr = inet->inet_rcv_saddr;
584 __be32 saddr = inet->inet_daddr;
585 int dif = sk->sk_bound_dev_if;
586 struct net *net = sock_net(sk);
587 int sdif = l3mdev_master_ifindex_by_index(net, ifindex: dif);
588 INET_ADDR_COOKIE(acookie, saddr, daddr);
589 const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
590 struct inet_ehash_bucket *head = inet_ehash_bucket(hashinfo: hinfo, hash);
591 struct inet_timewait_sock *tw = NULL;
592 const struct hlist_nulls_node *node;
593 struct sock *sk2;
594 spinlock_t *lock;
595
596 if (rcu_lookup) {
597 sk_nulls_for_each(sk2, node, &head->chain) {
598 if (sk2->sk_hash != hash ||
599 !inet_match(net, sk: sk2, cookie: acookie, ports, dif, sdif))
600 continue;
601 if (sk2->sk_state == TCP_TIME_WAIT)
602 break;
603 return -EADDRNOTAVAIL;
604 }
605 return 0;
606 }
607
608 lock = inet_ehash_lockp(hashinfo: hinfo, hash);
609 spin_lock(lock);
610
611 sk_nulls_for_each(sk2, node, &head->chain) {
612 if (sk2->sk_hash != hash)
613 continue;
614
615 if (likely(inet_match(net, sk2, acookie, ports, dif, sdif))) {
616 if (sk2->sk_state == TCP_TIME_WAIT) {
617 tw = inet_twsk(sk: sk2);
618 if (tcp_twsk_unique(sk, sktw: sk2, twp))
619 break;
620 }
621 goto not_unique;
622 }
623 }
624
625 /* Must record num and sport now. Otherwise we will see
626 * in hash table socket with a funny identity.
627 */
628 inet->inet_num = lport;
629 inet->inet_sport = htons(lport);
630 sk->sk_hash = hash;
631 WARN_ON(!sk_unhashed(sk));
632 __sk_nulls_add_node_rcu(sk, list: &head->chain);
633 if (tw) {
634 sk_nulls_del_node_init_rcu(sk: (struct sock *)tw);
635 __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
636 }
637 spin_unlock(lock);
638 sock_prot_inuse_add(net: sock_net(sk), prot: sk->sk_prot, val: 1);
639
640 if (twp) {
641 *twp = tw;
642 } else if (tw) {
643 /* Silly. Should hash-dance instead... */
644 inet_twsk_deschedule_put(tw);
645 }
646 return 0;
647
648not_unique:
649 spin_unlock(lock);
650 return -EADDRNOTAVAIL;
651}
652
653static u64 inet_sk_port_offset(const struct sock *sk)
654{
655 const struct inet_sock *inet = inet_sk(sk);
656
657 return secure_ipv4_port_ephemeral(saddr: inet->inet_rcv_saddr,
658 daddr: inet->inet_daddr,
659 dport: inet->inet_dport);
660}
661
662/* Searches for an exsiting socket in the ehash bucket list.
663 * Returns true if found, false otherwise.
664 */
665static bool inet_ehash_lookup_by_sk(struct sock *sk,
666 struct hlist_nulls_head *list)
667{
668 const __portpair ports = INET_COMBINED_PORTS(sk->sk_dport, sk->sk_num);
669 const int sdif = sk->sk_bound_dev_if;
670 const int dif = sk->sk_bound_dev_if;
671 const struct hlist_nulls_node *node;
672 struct net *net = sock_net(sk);
673 struct sock *esk;
674
675 INET_ADDR_COOKIE(acookie, sk->sk_daddr, sk->sk_rcv_saddr);
676
677 sk_nulls_for_each_rcu(esk, node, list) {
678 if (esk->sk_hash != sk->sk_hash)
679 continue;
680 if (sk->sk_family == AF_INET) {
681 if (unlikely(inet_match(net, esk, acookie,
682 ports, dif, sdif))) {
683 return true;
684 }
685 }
686#if IS_ENABLED(CONFIG_IPV6)
687 else if (sk->sk_family == AF_INET6) {
688 if (unlikely(inet6_match(net, esk,
689 &sk->sk_v6_daddr,
690 &sk->sk_v6_rcv_saddr,
691 ports, dif, sdif))) {
692 return true;
693 }
694 }
695#endif
696 }
697 return false;
698}
699
700/* Insert a socket into ehash, and eventually remove another one
701 * (The another one can be a SYN_RECV or TIMEWAIT)
702 * If an existing socket already exists, socket sk is not inserted,
703 * and sets found_dup_sk parameter to true.
704 */
705bool inet_ehash_insert(struct sock *sk, struct sock *osk, bool *found_dup_sk)
706{
707 struct inet_hashinfo *hashinfo = tcp_get_hashinfo(sk);
708 struct inet_ehash_bucket *head;
709 struct hlist_nulls_head *list;
710 spinlock_t *lock;
711 bool ret = true;
712
713 WARN_ON_ONCE(!sk_unhashed(sk));
714
715 sk->sk_hash = sk_ehashfn(sk);
716 head = inet_ehash_bucket(hashinfo, hash: sk->sk_hash);
717 list = &head->chain;
718 lock = inet_ehash_lockp(hashinfo, hash: sk->sk_hash);
719
720 spin_lock(lock);
721 if (osk) {
722 WARN_ON_ONCE(sk->sk_hash != osk->sk_hash);
723 ret = sk_nulls_del_node_init_rcu(sk: osk);
724 } else if (found_dup_sk) {
725 *found_dup_sk = inet_ehash_lookup_by_sk(sk, list);
726 if (*found_dup_sk)
727 ret = false;
728 }
729
730 if (ret)
731 __sk_nulls_add_node_rcu(sk, list);
732
733 spin_unlock(lock);
734
735 return ret;
736}
737
738bool inet_ehash_nolisten(struct sock *sk, struct sock *osk, bool *found_dup_sk)
739{
740 bool ok = inet_ehash_insert(sk, osk, found_dup_sk);
741
742 if (ok) {
743 sock_prot_inuse_add(net: sock_net(sk), prot: sk->sk_prot, val: 1);
744 } else {
745 tcp_orphan_count_inc();
746 inet_sk_set_state(sk, state: TCP_CLOSE);
747 sock_set_flag(sk, flag: SOCK_DEAD);
748 inet_csk_destroy_sock(sk);
749 }
750 return ok;
751}
752EXPORT_IPV6_MOD(inet_ehash_nolisten);
753
754static int inet_reuseport_add_sock(struct sock *sk,
755 struct inet_listen_hashbucket *ilb)
756{
757 struct inet_bind_bucket *tb = inet_csk(sk)->icsk_bind_hash;
758 const struct hlist_nulls_node *node;
759 kuid_t uid = sk_uid(sk);
760 struct sock *sk2;
761
762 sk_nulls_for_each_rcu(sk2, node, &ilb->nulls_head) {
763 if (sk2 != sk &&
764 sk2->sk_family == sk->sk_family &&
765 ipv6_only_sock(sk2) == ipv6_only_sock(sk) &&
766 sk2->sk_bound_dev_if == sk->sk_bound_dev_if &&
767 inet_csk(sk2)->icsk_bind_hash == tb &&
768 sk2->sk_reuseport && uid_eq(left: uid, right: sk_uid(sk: sk2)) &&
769 inet_rcv_saddr_equal(sk, sk2, match_wildcard: false))
770 return reuseport_add_sock(sk, sk2,
771 bind_inany: inet_rcv_saddr_any(sk));
772 }
773
774 return reuseport_alloc(sk, bind_inany: inet_rcv_saddr_any(sk));
775}
776
777int inet_hash(struct sock *sk)
778{
779 struct inet_hashinfo *hashinfo = tcp_get_hashinfo(sk);
780 struct inet_listen_hashbucket *ilb2;
781 int err = 0;
782
783 if (sk->sk_state == TCP_CLOSE)
784 return 0;
785
786 if (sk->sk_state != TCP_LISTEN) {
787 local_bh_disable();
788 inet_ehash_nolisten(sk, NULL, NULL);
789 local_bh_enable();
790 return 0;
791 }
792 WARN_ON(!sk_unhashed(sk));
793 ilb2 = inet_lhash2_bucket_sk(h: hashinfo, sk);
794
795 spin_lock(lock: &ilb2->lock);
796 if (sk->sk_reuseport) {
797 err = inet_reuseport_add_sock(sk, ilb: ilb2);
798 if (err)
799 goto unlock;
800 }
801 sock_set_flag(sk, flag: SOCK_RCU_FREE);
802 if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
803 sk->sk_family == AF_INET6)
804 __sk_nulls_add_node_tail_rcu(sk, list: &ilb2->nulls_head);
805 else
806 __sk_nulls_add_node_rcu(sk, list: &ilb2->nulls_head);
807 sock_prot_inuse_add(net: sock_net(sk), prot: sk->sk_prot, val: 1);
808unlock:
809 spin_unlock(lock: &ilb2->lock);
810
811 return err;
812}
813EXPORT_IPV6_MOD(inet_hash);
814
815void inet_unhash(struct sock *sk)
816{
817 struct inet_hashinfo *hashinfo = tcp_get_hashinfo(sk);
818
819 if (sk_unhashed(sk))
820 return;
821
822 sock_rps_delete_flow(sk);
823 if (sk->sk_state == TCP_LISTEN) {
824 struct inet_listen_hashbucket *ilb2;
825
826 ilb2 = inet_lhash2_bucket_sk(h: hashinfo, sk);
827 /* Don't disable bottom halves while acquiring the lock to
828 * avoid circular locking dependency on PREEMPT_RT.
829 */
830 spin_lock(lock: &ilb2->lock);
831 if (rcu_access_pointer(sk->sk_reuseport_cb))
832 reuseport_stop_listen_sock(sk);
833
834 __sk_nulls_del_node_init_rcu(sk);
835 sock_prot_inuse_add(net: sock_net(sk), prot: sk->sk_prot, val: -1);
836 spin_unlock(lock: &ilb2->lock);
837 } else {
838 spinlock_t *lock = inet_ehash_lockp(hashinfo, hash: sk->sk_hash);
839
840 spin_lock_bh(lock);
841 __sk_nulls_del_node_init_rcu(sk);
842 sock_prot_inuse_add(net: sock_net(sk), prot: sk->sk_prot, val: -1);
843 spin_unlock_bh(lock);
844 }
845}
846EXPORT_IPV6_MOD(inet_unhash);
847
848static bool inet_bind2_bucket_match(const struct inet_bind2_bucket *tb,
849 const struct net *net, unsigned short port,
850 int l3mdev, const struct sock *sk)
851{
852 if (!net_eq(net1: ib2_net(ib: tb), net2: net) || tb->port != port ||
853 tb->l3mdev != l3mdev)
854 return false;
855
856 return inet_bind2_bucket_addr_match(tb2: tb, sk);
857}
858
859bool inet_bind2_bucket_match_addr_any(const struct inet_bind2_bucket *tb, const struct net *net,
860 unsigned short port, int l3mdev, const struct sock *sk)
861{
862 if (!net_eq(net1: ib2_net(ib: tb), net2: net) || tb->port != port ||
863 tb->l3mdev != l3mdev)
864 return false;
865
866#if IS_ENABLED(CONFIG_IPV6)
867 if (tb->addr_type == IPV6_ADDR_ANY)
868 return true;
869
870 if (tb->addr_type != IPV6_ADDR_MAPPED)
871 return false;
872
873 if (sk->sk_family == AF_INET6 &&
874 !ipv6_addr_v4mapped(a: &sk->sk_v6_rcv_saddr))
875 return false;
876#endif
877 return tb->rcv_saddr == 0;
878}
879
880/* The socket's bhash2 hashbucket spinlock must be held when this is called */
881struct inet_bind2_bucket *
882inet_bind2_bucket_find(const struct inet_bind_hashbucket *head, const struct net *net,
883 unsigned short port, int l3mdev, const struct sock *sk)
884{
885 struct inet_bind2_bucket *bhash2 = NULL;
886
887 inet_bind_bucket_for_each(bhash2, &head->chain)
888 if (inet_bind2_bucket_match(tb: bhash2, net, port, l3mdev, sk))
889 break;
890
891 return bhash2;
892}
893
894struct inet_bind_hashbucket *
895inet_bhash2_addr_any_hashbucket(const struct sock *sk, const struct net *net, int port)
896{
897 struct inet_hashinfo *hinfo = tcp_get_hashinfo(sk);
898 u32 hash;
899
900#if IS_ENABLED(CONFIG_IPV6)
901 if (sk->sk_family == AF_INET6)
902 hash = ipv6_portaddr_hash(net, addr6: &in6addr_any, port);
903 else
904#endif
905 hash = ipv4_portaddr_hash(net, saddr: 0, port);
906
907 return &hinfo->bhash2[hash & (hinfo->bhash_size - 1)];
908}
909
910static void inet_update_saddr(struct sock *sk, void *saddr, int family)
911{
912 if (family == AF_INET) {
913 inet_sk(sk)->inet_saddr = *(__be32 *)saddr;
914 sk_rcv_saddr_set(sk, inet_sk(sk)->inet_saddr);
915 }
916#if IS_ENABLED(CONFIG_IPV6)
917 else {
918 sk->sk_v6_rcv_saddr = *(struct in6_addr *)saddr;
919 }
920#endif
921}
922
923static int __inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family, bool reset)
924{
925 struct inet_hashinfo *hinfo = tcp_get_hashinfo(sk);
926 struct inet_bind_hashbucket *head, *head2;
927 struct inet_bind2_bucket *tb2, *new_tb2;
928 int l3mdev = inet_sk_bound_l3mdev(sk);
929 int port = inet_sk(sk)->inet_num;
930 struct net *net = sock_net(sk);
931 int bhash;
932
933 if (!inet_csk(sk)->icsk_bind2_hash) {
934 /* Not bind()ed before. */
935 if (reset)
936 inet_reset_saddr(sk);
937 else
938 inet_update_saddr(sk, saddr, family);
939
940 return 0;
941 }
942
943 /* Allocate a bind2 bucket ahead of time to avoid permanently putting
944 * the bhash2 table in an inconsistent state if a new tb2 bucket
945 * allocation fails.
946 */
947 new_tb2 = kmem_cache_alloc(hinfo->bind2_bucket_cachep, GFP_ATOMIC);
948 if (!new_tb2) {
949 if (reset) {
950 /* The (INADDR_ANY, port) bucket might have already
951 * been freed, then we cannot fixup icsk_bind2_hash,
952 * so we give up and unlink sk from bhash/bhash2 not
953 * to leave inconsistency in bhash2.
954 */
955 inet_put_port(sk);
956 inet_reset_saddr(sk);
957 }
958
959 return -ENOMEM;
960 }
961
962 bhash = inet_bhashfn(net, lport: port, bhash_size: hinfo->bhash_size);
963 head = &hinfo->bhash[bhash];
964 head2 = inet_bhashfn_portaddr(hinfo, sk, net, port);
965
966 /* If we change saddr locklessly, another thread
967 * iterating over bhash might see corrupted address.
968 */
969 spin_lock_bh(lock: &head->lock);
970
971 spin_lock(lock: &head2->lock);
972 __sk_del_bind_node(sk);
973 inet_bind2_bucket_destroy(cachep: hinfo->bind2_bucket_cachep, inet_csk(sk)->icsk_bind2_hash);
974 spin_unlock(lock: &head2->lock);
975
976 if (reset)
977 inet_reset_saddr(sk);
978 else
979 inet_update_saddr(sk, saddr, family);
980
981 head2 = inet_bhashfn_portaddr(hinfo, sk, net, port);
982
983 spin_lock(lock: &head2->lock);
984 tb2 = inet_bind2_bucket_find(head: head2, net, port, l3mdev, sk);
985 if (!tb2) {
986 tb2 = new_tb2;
987 inet_bind2_bucket_init(tb2, net, head: head2, inet_csk(sk)->icsk_bind_hash, sk);
988 if (sk_is_connect_bind(sk)) {
989 tb2->fastreuse = -1;
990 tb2->fastreuseport = -1;
991 }
992 }
993 inet_csk(sk)->icsk_bind2_hash = tb2;
994 sk_add_bind_node(sk, list: &tb2->owners);
995 spin_unlock(lock: &head2->lock);
996
997 spin_unlock_bh(lock: &head->lock);
998
999 if (tb2 != new_tb2)
1000 kmem_cache_free(s: hinfo->bind2_bucket_cachep, objp: new_tb2);
1001
1002 return 0;
1003}
1004
1005int inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family)
1006{
1007 return __inet_bhash2_update_saddr(sk, saddr, family, reset: false);
1008}
1009EXPORT_IPV6_MOD(inet_bhash2_update_saddr);
1010
1011void inet_bhash2_reset_saddr(struct sock *sk)
1012{
1013 if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
1014 __inet_bhash2_update_saddr(sk, NULL, family: 0, reset: true);
1015}
1016EXPORT_IPV6_MOD(inet_bhash2_reset_saddr);
1017
1018/* RFC 6056 3.3.4. Algorithm 4: Double-Hash Port Selection Algorithm
1019 * Note that we use 32bit integers (vs RFC 'short integers')
1020 * because 2^16 is not a multiple of num_ephemeral and this
1021 * property might be used by clever attacker.
1022 *
1023 * RFC claims using TABLE_LENGTH=10 buckets gives an improvement, though
1024 * attacks were since demonstrated, thus we use 65536 by default instead
1025 * to really give more isolation and privacy, at the expense of 256kB
1026 * of kernel memory.
1027 */
1028#define INET_TABLE_PERTURB_SIZE (1 << CONFIG_INET_TABLE_PERTURB_ORDER)
1029static u32 *table_perturb;
1030
1031int __inet_hash_connect(struct inet_timewait_death_row *death_row,
1032 struct sock *sk, u64 port_offset,
1033 u32 hash_port0,
1034 int (*check_established)(struct inet_timewait_death_row *,
1035 struct sock *, __u16, struct inet_timewait_sock **,
1036 bool rcu_lookup, u32 hash))
1037{
1038 struct inet_hashinfo *hinfo = death_row->hashinfo;
1039 struct inet_bind_hashbucket *head, *head2;
1040 struct inet_timewait_sock *tw = NULL;
1041 int port = inet_sk(sk)->inet_num;
1042 struct net *net = sock_net(sk);
1043 struct inet_bind2_bucket *tb2;
1044 struct inet_bind_bucket *tb;
1045 bool tb_created = false;
1046 u32 remaining, offset;
1047 int ret, i, low, high;
1048 bool local_ports;
1049 int step, l3mdev;
1050 u32 index;
1051
1052 if (port) {
1053 local_bh_disable();
1054 ret = check_established(death_row, sk, port, NULL, false,
1055 hash_port0 + port);
1056 local_bh_enable();
1057 return ret;
1058 }
1059
1060 l3mdev = inet_sk_bound_l3mdev(sk);
1061
1062 local_ports = inet_sk_get_local_port_range(sk, low: &low, high: &high);
1063 step = local_ports ? 1 : 2;
1064
1065 high++; /* [32768, 60999] -> [32768, 61000[ */
1066 remaining = high - low;
1067 if (!local_ports && remaining > 1)
1068 remaining &= ~1U;
1069
1070 get_random_sleepable_once(table_perturb,
1071 INET_TABLE_PERTURB_SIZE * sizeof(*table_perturb));
1072 index = port_offset & (INET_TABLE_PERTURB_SIZE - 1);
1073
1074 offset = READ_ONCE(table_perturb[index]) + (port_offset >> 32);
1075 offset %= remaining;
1076
1077 /* In first pass we try ports of @low parity.
1078 * inet_csk_get_port() does the opposite choice.
1079 */
1080 if (!local_ports)
1081 offset &= ~1U;
1082other_parity_scan:
1083 port = low + offset;
1084 for (i = 0; i < remaining; i += step, port += step) {
1085 if (unlikely(port >= high))
1086 port -= remaining;
1087 if (inet_is_local_reserved_port(net, port))
1088 continue;
1089 head = &hinfo->bhash[inet_bhashfn(net, lport: port,
1090 bhash_size: hinfo->bhash_size)];
1091 rcu_read_lock();
1092 hlist_for_each_entry_rcu(tb, &head->chain, node) {
1093 if (!inet_bind_bucket_match(tb, net, port, l3mdev))
1094 continue;
1095 if (tb->fastreuse >= 0 || tb->fastreuseport >= 0) {
1096 rcu_read_unlock();
1097 goto next_port;
1098 }
1099 if (!check_established(death_row, sk, port, &tw, true,
1100 hash_port0 + port))
1101 break;
1102 rcu_read_unlock();
1103 goto next_port;
1104 }
1105 rcu_read_unlock();
1106
1107 spin_lock_bh(lock: &head->lock);
1108
1109 /* Does not bother with rcv_saddr checks, because
1110 * the established check is already unique enough.
1111 */
1112 inet_bind_bucket_for_each(tb, &head->chain) {
1113 if (inet_bind_bucket_match(tb, net, port, l3mdev)) {
1114 if (tb->fastreuse >= 0 ||
1115 tb->fastreuseport >= 0)
1116 goto next_port_unlock;
1117 WARN_ON(hlist_empty(&tb->bhash2));
1118 if (!check_established(death_row, sk,
1119 port, &tw, false,
1120 hash_port0 + port))
1121 goto ok;
1122 goto next_port_unlock;
1123 }
1124 }
1125
1126 tb = inet_bind_bucket_create(cachep: hinfo->bind_bucket_cachep,
1127 net, head, snum: port, l3mdev);
1128 if (!tb) {
1129 spin_unlock_bh(lock: &head->lock);
1130 return -ENOMEM;
1131 }
1132 tb_created = true;
1133 tb->fastreuse = -1;
1134 tb->fastreuseport = -1;
1135 goto ok;
1136next_port_unlock:
1137 spin_unlock_bh(lock: &head->lock);
1138next_port:
1139 cond_resched();
1140 }
1141
1142 if (!local_ports) {
1143 offset++;
1144 if ((offset & 1) && remaining > 1)
1145 goto other_parity_scan;
1146 }
1147 return -EADDRNOTAVAIL;
1148
1149ok:
1150 /* Find the corresponding tb2 bucket since we need to
1151 * add the socket to the bhash2 table as well
1152 */
1153 head2 = inet_bhashfn_portaddr(hinfo, sk, net, port);
1154 spin_lock(lock: &head2->lock);
1155
1156 tb2 = inet_bind2_bucket_find(head: head2, net, port, l3mdev, sk);
1157 if (!tb2) {
1158 tb2 = inet_bind2_bucket_create(cachep: hinfo->bind2_bucket_cachep, net,
1159 head: head2, tb, sk);
1160 if (!tb2)
1161 goto error;
1162 tb2->fastreuse = -1;
1163 tb2->fastreuseport = -1;
1164 }
1165
1166 /* Here we want to add a little bit of randomness to the next source
1167 * port that will be chosen. We use a max() with a random here so that
1168 * on low contention the randomness is maximal and on high contention
1169 * it may be inexistent.
1170 */
1171 i = max_t(int, i, get_random_u32_below(8) * step);
1172 WRITE_ONCE(table_perturb[index], READ_ONCE(table_perturb[index]) + i + step);
1173
1174 /* Head lock still held and bh's disabled */
1175 inet_bind_hash(sk, tb, tb2, port);
1176 sk->sk_userlocks |= SOCK_CONNECT_BIND;
1177
1178 if (sk_unhashed(sk)) {
1179 inet_sk(sk)->inet_sport = htons(port);
1180 inet_ehash_nolisten(sk, osk: (struct sock *)tw, NULL);
1181 }
1182 if (tw)
1183 inet_twsk_bind_unhash(tw, hashinfo: hinfo);
1184
1185 spin_unlock(lock: &head2->lock);
1186 spin_unlock(lock: &head->lock);
1187
1188 if (tw)
1189 inet_twsk_deschedule_put(tw);
1190 local_bh_enable();
1191 return 0;
1192
1193error:
1194 if (sk_hashed(sk)) {
1195 spinlock_t *lock = inet_ehash_lockp(hashinfo: hinfo, hash: sk->sk_hash);
1196
1197 sock_prot_inuse_add(net, prot: sk->sk_prot, val: -1);
1198
1199 spin_lock(lock);
1200 __sk_nulls_del_node_init_rcu(sk);
1201 spin_unlock(lock);
1202
1203 sk->sk_hash = 0;
1204 inet_sk(sk)->inet_sport = 0;
1205 inet_sk(sk)->inet_num = 0;
1206
1207 if (tw)
1208 inet_twsk_bind_unhash(tw, hashinfo: hinfo);
1209 }
1210
1211 spin_unlock(lock: &head2->lock);
1212 if (tb_created)
1213 inet_bind_bucket_destroy(tb);
1214 spin_unlock(lock: &head->lock);
1215
1216 if (tw)
1217 inet_twsk_deschedule_put(tw);
1218
1219 local_bh_enable();
1220
1221 return -ENOMEM;
1222}
1223
1224/*
1225 * Bind a port for a connect operation and hash it.
1226 */
1227int inet_hash_connect(struct inet_timewait_death_row *death_row,
1228 struct sock *sk)
1229{
1230 const struct inet_sock *inet = inet_sk(sk);
1231 const struct net *net = sock_net(sk);
1232 u64 port_offset = 0;
1233 u32 hash_port0;
1234
1235 if (!inet_sk(sk)->inet_num)
1236 port_offset = inet_sk_port_offset(sk);
1237
1238 hash_port0 = inet_ehashfn(net, inet->inet_rcv_saddr, 0,
1239 inet->inet_daddr, inet->inet_dport);
1240
1241 return __inet_hash_connect(death_row, sk, port_offset, hash_port0,
1242 check_established: __inet_check_established);
1243}
1244
1245static void init_hashinfo_lhash2(struct inet_hashinfo *h)
1246{
1247 int i;
1248
1249 for (i = 0; i <= h->lhash2_mask; i++) {
1250 spin_lock_init(&h->lhash2[i].lock);
1251 INIT_HLIST_NULLS_HEAD(&h->lhash2[i].nulls_head,
1252 i + LISTENING_NULLS_BASE);
1253 }
1254}
1255
1256void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
1257 unsigned long numentries, int scale,
1258 unsigned long low_limit,
1259 unsigned long high_limit)
1260{
1261 h->lhash2 = alloc_large_system_hash(tablename: name,
1262 bucketsize: sizeof(*h->lhash2),
1263 numentries,
1264 scale,
1265 flags: 0,
1266 NULL,
1267 hash_mask: &h->lhash2_mask,
1268 low_limit,
1269 high_limit);
1270 init_hashinfo_lhash2(h);
1271
1272 /* this one is used for source ports of outgoing connections */
1273 table_perturb = alloc_large_system_hash(tablename: "Table-perturb",
1274 bucketsize: sizeof(*table_perturb),
1275 INET_TABLE_PERTURB_SIZE,
1276 scale: 0, flags: 0, NULL, NULL,
1277 INET_TABLE_PERTURB_SIZE,
1278 INET_TABLE_PERTURB_SIZE);
1279}
1280
1281int inet_hashinfo2_init_mod(struct inet_hashinfo *h)
1282{
1283 h->lhash2 = kmalloc_array(INET_LHTABLE_SIZE, sizeof(*h->lhash2), GFP_KERNEL);
1284 if (!h->lhash2)
1285 return -ENOMEM;
1286
1287 h->lhash2_mask = INET_LHTABLE_SIZE - 1;
1288 /* INET_LHTABLE_SIZE must be a power of 2 */
1289 BUG_ON(INET_LHTABLE_SIZE & h->lhash2_mask);
1290
1291 init_hashinfo_lhash2(h);
1292 return 0;
1293}
1294
1295int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
1296{
1297 unsigned int locksz = sizeof(spinlock_t);
1298 unsigned int i, nblocks = 1;
1299 spinlock_t *ptr = NULL;
1300
1301 if (locksz == 0)
1302 goto set_mask;
1303
1304 /* Allocate 2 cache lines or at least one spinlock per cpu. */
1305 nblocks = max(2U * L1_CACHE_BYTES / locksz, 1U) * num_possible_cpus();
1306
1307 /* At least one page per NUMA node. */
1308 nblocks = max(nblocks, num_online_nodes() * PAGE_SIZE / locksz);
1309
1310 nblocks = roundup_pow_of_two(nblocks);
1311
1312 /* No more locks than number of hash buckets. */
1313 nblocks = min(nblocks, hashinfo->ehash_mask + 1);
1314
1315 if (num_online_nodes() > 1) {
1316 /* Use vmalloc() to allow NUMA policy to spread pages
1317 * on all available nodes if desired.
1318 */
1319 ptr = vmalloc_array(nblocks, locksz);
1320 }
1321 if (!ptr) {
1322 ptr = kvmalloc_array(nblocks, locksz, GFP_KERNEL);
1323 if (!ptr)
1324 return -ENOMEM;
1325 }
1326 for (i = 0; i < nblocks; i++)
1327 spin_lock_init(&ptr[i]);
1328 hashinfo->ehash_locks = ptr;
1329set_mask:
1330 hashinfo->ehash_locks_mask = nblocks - 1;
1331 return 0;
1332}
1333
1334struct inet_hashinfo *inet_pernet_hashinfo_alloc(struct inet_hashinfo *hashinfo,
1335 unsigned int ehash_entries)
1336{
1337 struct inet_hashinfo *new_hashinfo;
1338 int i;
1339
1340 new_hashinfo = kmemdup(hashinfo, sizeof(*hashinfo), GFP_KERNEL);
1341 if (!new_hashinfo)
1342 goto err;
1343
1344 new_hashinfo->ehash = vmalloc_huge(size: ehash_entries * sizeof(struct inet_ehash_bucket),
1345 GFP_KERNEL_ACCOUNT);
1346 if (!new_hashinfo->ehash)
1347 goto free_hashinfo;
1348
1349 new_hashinfo->ehash_mask = ehash_entries - 1;
1350
1351 if (inet_ehash_locks_alloc(hashinfo: new_hashinfo))
1352 goto free_ehash;
1353
1354 for (i = 0; i < ehash_entries; i++)
1355 INIT_HLIST_NULLS_HEAD(&new_hashinfo->ehash[i].chain, i);
1356
1357 new_hashinfo->pernet = true;
1358
1359 return new_hashinfo;
1360
1361free_ehash:
1362 vfree(addr: new_hashinfo->ehash);
1363free_hashinfo:
1364 kfree(objp: new_hashinfo);
1365err:
1366 return NULL;
1367}
1368
1369void inet_pernet_hashinfo_free(struct inet_hashinfo *hashinfo)
1370{
1371 if (!hashinfo->pernet)
1372 return;
1373
1374 inet_ehash_locks_free(hashinfo);
1375 vfree(addr: hashinfo->ehash);
1376 kfree(objp: hashinfo);
1377}
1378