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.
6 * Generic INET transport hashtables
8 * Authors: Lotsa people, from code originally in tcp
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.
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>
24 #include <net/addrconf.h>
25 #include <net/inet_connection_sock.h>
26 #include <net/inet_hashtables.h>
27 #include <net/secure_seq.h>
30 #include <net/sock_reuseport.h>
32 static u32 inet_ehashfn(const struct net *net, const __be32 laddr,
33 const __u16 lport, const __be32 faddr,
36 static u32 inet_ehash_secret __read_mostly;
38 net_get_random_once(&inet_ehash_secret, sizeof(inet_ehash_secret));
40 return __inet_ehashfn(laddr, lport, faddr, fport,
41 inet_ehash_secret + net_hash_mix(net));
44 /* This function handles inet_sock, but also timewait and request sockets
47 static u32 sk_ehashfn(const struct sock *sk)
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);
56 return inet_ehashfn(sock_net(sk),
57 sk->sk_rcv_saddr, sk->sk_num,
58 sk->sk_daddr, sk->sk_dport);
62 * Allocate and initialize a new local port bind bucket.
63 * The bindhash mutex for snum's hash chain must be held here.
65 struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
67 struct inet_bind_hashbucket *head,
68 const unsigned short snum)
70 struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
73 write_pnet(&tb->ib_net, net);
76 tb->fastreuseport = 0;
77 INIT_HLIST_HEAD(&tb->owners);
78 hlist_add_head(&tb->node, &head->chain);
84 * Caller must hold hashbucket lock for this tb with local BH disabled
86 void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb)
88 if (hlist_empty(&tb->owners)) {
89 __hlist_del(&tb->node);
90 kmem_cache_free(cachep, tb);
94 void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
95 const unsigned short snum)
97 inet_sk(sk)->inet_num = snum;
98 sk_add_bind_node(sk, &tb->owners);
99 inet_csk(sk)->icsk_bind_hash = tb;
103 * Get rid of any references to a local port held by the given sock.
105 static void __inet_put_port(struct sock *sk)
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;
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);
122 void inet_put_port(struct sock *sk)
128 EXPORT_SYMBOL(inet_put_port);
130 int __inet_inherit_port(const struct sock *sk, struct sock *child)
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,
136 struct inet_bind_hashbucket *head = &table->bhash[bhash];
137 struct inet_bind_bucket *tb;
139 spin_lock(&head->lock);
140 tb = inet_csk(sk)->icsk_bind_hash;
142 spin_unlock(&head->lock);
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)) &&
157 tb = inet_bind_bucket_create(table->bind_bucket_cachep,
158 sock_net(sk), head, port);
160 spin_unlock(&head->lock);
165 inet_bind_hash(child, tb, port);
166 spin_unlock(&head->lock);
170 EXPORT_SYMBOL_GPL(__inet_inherit_port);
172 static struct inet_listen_hashbucket *
173 inet_lhash2_bucket_sk(struct inet_hashinfo *h, struct sock *sk)
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);
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);
190 static void inet_hash2(struct inet_hashinfo *h, struct sock *sk)
192 struct inet_listen_hashbucket *ilb2;
197 ilb2 = inet_lhash2_bucket_sk(h, sk);
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,
204 hlist_add_head_rcu(&inet_csk(sk)->icsk_listen_portaddr_node,
207 spin_unlock(&ilb2->lock);
210 static void inet_unhash2(struct inet_hashinfo *h, struct sock *sk)
212 struct inet_listen_hashbucket *ilb2;
215 WARN_ON_ONCE(hlist_unhashed(&inet_csk(sk)->icsk_listen_portaddr_node)))
218 ilb2 = inet_lhash2_bucket_sk(h, sk);
220 spin_lock(&ilb2->lock);
221 hlist_del_init_rcu(&inet_csk(sk)->icsk_listen_portaddr_node);
223 spin_unlock(&ilb2->lock);
226 static 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)
231 struct inet_sock *inet = inet_sk(sk);
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;
238 if (rcv_saddr != daddr)
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);
248 if (sk->sk_bound_dev_if)
251 if (sk->sk_incoming_cpu == raw_smp_processor_id())
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.
264 /* called with rcu_read_lock() : No refcount taken on the socket */
265 static 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)
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;
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,
286 result = reuseport_select_sock(sk, phash,
299 struct 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)
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;
315 if (ilb->count <= 10 || !hashinfo->lhash2)
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.
322 hash2 = ipv4_portaddr_hash(net, daddr, hnum);
323 ilb2 = inet_lhash2_bucket(hashinfo, hash2);
324 if (ilb2->count > ilb->count)
327 result = inet_lhash2_lookup(net, ilb2, skb, doff,
328 saddr, sport, daddr, hnum,
333 /* Lookup lhash2 with INADDR_ANY */
335 hash2 = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum);
336 ilb2 = inet_lhash2_bucket(hashinfo, hash2);
337 if (ilb2->count > ilb->count)
340 result = inet_lhash2_lookup(net, ilb2, skb, doff,
341 saddr, sport, daddr, hnum,
346 sk_for_each_rcu(sk, &ilb->head) {
347 score = compute_score(sk, net, hnum, daddr,
348 dif, sdif, exact_dif);
349 if (score > hiscore) {
350 if (sk->sk_reuseport) {
351 phash = inet_ehashfn(net, daddr, hnum,
353 result = reuseport_select_sock(sk, phash,
363 if (unlikely(IS_ERR(result)))
367 EXPORT_SYMBOL_GPL(__inet_lookup_listener);
369 /* All sockets share common refcount, but have different destructors */
370 void sock_gen_put(struct sock *sk)
372 if (!refcount_dec_and_test(&sk->sk_refcnt))
375 if (sk->sk_state == TCP_TIME_WAIT)
376 inet_twsk_free(inet_twsk(sk));
377 else if (sk->sk_state == TCP_NEW_SYN_RECV)
378 reqsk_free(inet_reqsk(sk));
382 EXPORT_SYMBOL_GPL(sock_gen_put);
384 void sock_edemux(struct sk_buff *skb)
386 sock_gen_put(skb->sk);
388 EXPORT_SYMBOL(sock_edemux);
390 struct sock *__inet_lookup_established(struct net *net,
391 struct inet_hashinfo *hashinfo,
392 const __be32 saddr, const __be16 sport,
393 const __be32 daddr, const u16 hnum,
394 const int dif, const int sdif)
396 INET_ADDR_COOKIE(acookie, saddr, daddr);
397 const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
399 const struct hlist_nulls_node *node;
400 /* Optimize here for direct hit, only listening connections can
401 * have wildcards anyways.
403 unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport);
404 unsigned int slot = hash & hashinfo->ehash_mask;
405 struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
408 sk_nulls_for_each_rcu(sk, node, &head->chain) {
409 if (sk->sk_hash != hash)
411 if (likely(INET_MATCH(sk, net, acookie,
412 saddr, daddr, ports, dif, sdif))) {
413 if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
415 if (unlikely(!INET_MATCH(sk, net, acookie,
425 * if the nulls value we got at the end of this lookup is
426 * not the expected one, we must restart lookup.
427 * We probably met an item that was moved to another chain.
429 if (get_nulls_value(node) != slot)
436 EXPORT_SYMBOL_GPL(__inet_lookup_established);
438 /* called with local bh disabled */
439 static int __inet_check_established(struct inet_timewait_death_row *death_row,
440 struct sock *sk, __u16 lport,
441 struct inet_timewait_sock **twp)
443 struct inet_hashinfo *hinfo = death_row->hashinfo;
444 struct inet_sock *inet = inet_sk(sk);
445 __be32 daddr = inet->inet_rcv_saddr;
446 __be32 saddr = inet->inet_daddr;
447 int dif = sk->sk_bound_dev_if;
448 struct net *net = sock_net(sk);
449 int sdif = l3mdev_master_ifindex_by_index(net, dif);
450 INET_ADDR_COOKIE(acookie, saddr, daddr);
451 const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
452 unsigned int hash = inet_ehashfn(net, daddr, lport,
453 saddr, inet->inet_dport);
454 struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
455 spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
457 const struct hlist_nulls_node *node;
458 struct inet_timewait_sock *tw = NULL;
462 sk_nulls_for_each(sk2, node, &head->chain) {
463 if (sk2->sk_hash != hash)
466 if (likely(INET_MATCH(sk2, net, acookie,
467 saddr, daddr, ports, dif, sdif))) {
468 if (sk2->sk_state == TCP_TIME_WAIT) {
470 if (twsk_unique(sk, sk2, twp))
477 /* Must record num and sport now. Otherwise we will see
478 * in hash table socket with a funny identity.
480 inet->inet_num = lport;
481 inet->inet_sport = htons(lport);
483 WARN_ON(!sk_unhashed(sk));
484 __sk_nulls_add_node_rcu(sk, &head->chain);
486 sk_nulls_del_node_init_rcu((struct sock *)tw);
487 __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
490 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
495 /* Silly. Should hash-dance instead... */
496 inet_twsk_deschedule_put(tw);
502 return -EADDRNOTAVAIL;
505 static u32 inet_sk_port_offset(const struct sock *sk)
507 const struct inet_sock *inet = inet_sk(sk);
509 return secure_ipv4_port_ephemeral(inet->inet_rcv_saddr,
514 /* insert a socket into ehash, and eventually remove another one
515 * (The another one can be a SYN_RECV or TIMEWAIT
517 bool inet_ehash_insert(struct sock *sk, struct sock *osk)
519 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
520 struct hlist_nulls_head *list;
521 struct inet_ehash_bucket *head;
525 WARN_ON_ONCE(!sk_unhashed(sk));
527 sk->sk_hash = sk_ehashfn(sk);
528 head = inet_ehash_bucket(hashinfo, sk->sk_hash);
530 lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
534 WARN_ON_ONCE(sk->sk_hash != osk->sk_hash);
535 ret = sk_nulls_del_node_init_rcu(osk);
538 __sk_nulls_add_node_rcu(sk, list);
543 bool inet_ehash_nolisten(struct sock *sk, struct sock *osk)
545 bool ok = inet_ehash_insert(sk, osk);
548 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
550 percpu_counter_inc(sk->sk_prot->orphan_count);
551 inet_sk_set_state(sk, TCP_CLOSE);
552 sock_set_flag(sk, SOCK_DEAD);
553 inet_csk_destroy_sock(sk);
557 EXPORT_SYMBOL_GPL(inet_ehash_nolisten);
559 static int inet_reuseport_add_sock(struct sock *sk,
560 struct inet_listen_hashbucket *ilb)
562 struct inet_bind_bucket *tb = inet_csk(sk)->icsk_bind_hash;
564 kuid_t uid = sock_i_uid(sk);
566 sk_for_each_rcu(sk2, &ilb->head) {
568 sk2->sk_family == sk->sk_family &&
569 ipv6_only_sock(sk2) == ipv6_only_sock(sk) &&
570 sk2->sk_bound_dev_if == sk->sk_bound_dev_if &&
571 inet_csk(sk2)->icsk_bind_hash == tb &&
572 sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) &&
573 inet_rcv_saddr_equal(sk, sk2, false))
574 return reuseport_add_sock(sk, sk2,
575 inet_rcv_saddr_any(sk));
578 return reuseport_alloc(sk, inet_rcv_saddr_any(sk));
581 int __inet_hash(struct sock *sk, struct sock *osk)
583 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
584 struct inet_listen_hashbucket *ilb;
587 if (sk->sk_state != TCP_LISTEN) {
588 inet_ehash_nolisten(sk, osk);
591 WARN_ON(!sk_unhashed(sk));
592 ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
594 spin_lock(&ilb->lock);
595 if (sk->sk_reuseport) {
596 err = inet_reuseport_add_sock(sk, ilb);
600 if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
601 sk->sk_family == AF_INET6)
602 hlist_add_tail_rcu(&sk->sk_node, &ilb->head);
604 hlist_add_head_rcu(&sk->sk_node, &ilb->head);
605 inet_hash2(hashinfo, sk);
607 sock_set_flag(sk, SOCK_RCU_FREE);
608 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
610 spin_unlock(&ilb->lock);
614 EXPORT_SYMBOL(__inet_hash);
616 int inet_hash(struct sock *sk)
620 if (sk->sk_state != TCP_CLOSE) {
622 err = __inet_hash(sk, NULL);
628 EXPORT_SYMBOL_GPL(inet_hash);
630 void inet_unhash(struct sock *sk)
632 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
633 struct inet_listen_hashbucket *ilb = NULL;
639 if (sk->sk_state == TCP_LISTEN) {
640 ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
643 lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
649 if (rcu_access_pointer(sk->sk_reuseport_cb))
650 reuseport_detach_sock(sk);
652 inet_unhash2(hashinfo, sk);
653 __sk_del_node_init(sk);
656 __sk_nulls_del_node_init_rcu(sk);
658 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
660 spin_unlock_bh(lock);
662 EXPORT_SYMBOL_GPL(inet_unhash);
664 int __inet_hash_connect(struct inet_timewait_death_row *death_row,
665 struct sock *sk, u32 port_offset,
666 int (*check_established)(struct inet_timewait_death_row *,
667 struct sock *, __u16, struct inet_timewait_sock **))
669 struct inet_hashinfo *hinfo = death_row->hashinfo;
670 struct inet_timewait_sock *tw = NULL;
671 struct inet_bind_hashbucket *head;
672 int port = inet_sk(sk)->inet_num;
673 struct net *net = sock_net(sk);
674 struct inet_bind_bucket *tb;
675 u32 remaining, offset;
676 int ret, i, low, high;
680 head = &hinfo->bhash[inet_bhashfn(net, port,
682 tb = inet_csk(sk)->icsk_bind_hash;
683 spin_lock_bh(&head->lock);
684 if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) {
685 inet_ehash_nolisten(sk, NULL);
686 spin_unlock_bh(&head->lock);
689 spin_unlock(&head->lock);
690 /* No definite answer... Walk to established hash table */
691 ret = check_established(death_row, sk, port, NULL);
696 inet_get_local_port_range(net, &low, &high);
697 high++; /* [32768, 60999] -> [32768, 61000[ */
698 remaining = high - low;
699 if (likely(remaining > 1))
702 offset = (hint + port_offset) % remaining;
703 /* In first pass we try ports of @low parity.
704 * inet_csk_get_port() does the opposite choice.
709 for (i = 0; i < remaining; i += 2, port += 2) {
710 if (unlikely(port >= high))
712 if (inet_is_local_reserved_port(net, port))
714 head = &hinfo->bhash[inet_bhashfn(net, port,
716 spin_lock_bh(&head->lock);
718 /* Does not bother with rcv_saddr checks, because
719 * the established check is already unique enough.
721 inet_bind_bucket_for_each(tb, &head->chain) {
722 if (net_eq(ib_net(tb), net) && tb->port == port) {
723 if (tb->fastreuse >= 0 ||
724 tb->fastreuseport >= 0)
726 WARN_ON(hlist_empty(&tb->owners));
727 if (!check_established(death_row, sk,
734 tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
737 spin_unlock_bh(&head->lock);
741 tb->fastreuseport = -1;
744 spin_unlock_bh(&head->lock);
749 if ((offset & 1) && remaining > 1)
750 goto other_parity_scan;
752 return -EADDRNOTAVAIL;
757 /* Head lock still held and bh's disabled */
758 inet_bind_hash(sk, tb, port);
759 if (sk_unhashed(sk)) {
760 inet_sk(sk)->inet_sport = htons(port);
761 inet_ehash_nolisten(sk, (struct sock *)tw);
764 inet_twsk_bind_unhash(tw, hinfo);
765 spin_unlock(&head->lock);
767 inet_twsk_deschedule_put(tw);
773 * Bind a port for a connect operation and hash it.
775 int inet_hash_connect(struct inet_timewait_death_row *death_row,
780 if (!inet_sk(sk)->inet_num)
781 port_offset = inet_sk_port_offset(sk);
782 return __inet_hash_connect(death_row, sk, port_offset,
783 __inet_check_established);
785 EXPORT_SYMBOL_GPL(inet_hash_connect);
787 void inet_hashinfo_init(struct inet_hashinfo *h)
791 for (i = 0; i < INET_LHTABLE_SIZE; i++) {
792 spin_lock_init(&h->listening_hash[i].lock);
793 INIT_HLIST_HEAD(&h->listening_hash[i].head);
794 h->listening_hash[i].count = 0;
799 EXPORT_SYMBOL_GPL(inet_hashinfo_init);
801 void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
802 unsigned long numentries, int scale,
803 unsigned long low_limit,
804 unsigned long high_limit)
808 h->lhash2 = alloc_large_system_hash(name,
818 for (i = 0; i <= h->lhash2_mask; i++) {
819 spin_lock_init(&h->lhash2[i].lock);
820 INIT_HLIST_HEAD(&h->lhash2[i].head);
821 h->lhash2[i].count = 0;
825 int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
827 unsigned int locksz = sizeof(spinlock_t);
828 unsigned int i, nblocks = 1;
831 /* allocate 2 cache lines or at least one spinlock per cpu */
832 nblocks = max(2U * L1_CACHE_BYTES / locksz, 1U);
833 nblocks = roundup_pow_of_two(nblocks * num_possible_cpus());
835 /* no more locks than number of hash buckets */
836 nblocks = min(nblocks, hashinfo->ehash_mask + 1);
838 hashinfo->ehash_locks = kvmalloc_array(nblocks, locksz, GFP_KERNEL);
839 if (!hashinfo->ehash_locks)
842 for (i = 0; i < nblocks; i++)
843 spin_lock_init(&hashinfo->ehash_locks[i]);
845 hashinfo->ehash_locks_mask = nblocks - 1;
848 EXPORT_SYMBOL_GPL(inet_ehash_locks_alloc);