1 // SPDX-License-Identifier: GPL-2.0-or-later
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.
7 * Generic INET transport hashtables
9 * Authors: Lotsa people, from code originally in tcp
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>
20 #include <net/addrconf.h>
21 #include <net/inet_connection_sock.h>
22 #include <net/inet_hashtables.h>
23 #include <net/secure_seq.h>
26 #include <net/sock_reuseport.h>
28 static u32 inet_ehashfn(const struct net *net, const __be32 laddr,
29 const __u16 lport, const __be32 faddr,
32 static u32 inet_ehash_secret __read_mostly;
34 net_get_random_once(&inet_ehash_secret, sizeof(inet_ehash_secret));
36 return __inet_ehashfn(laddr, lport, faddr, fport,
37 inet_ehash_secret + net_hash_mix(net));
40 /* This function handles inet_sock, but also timewait and request sockets
43 static u32 sk_ehashfn(const struct sock *sk)
45 #if IS_ENABLED(CONFIG_IPV6)
46 if (sk->sk_family == AF_INET6 &&
47 !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
48 return inet6_ehashfn(sock_net(sk),
49 &sk->sk_v6_rcv_saddr, sk->sk_num,
50 &sk->sk_v6_daddr, sk->sk_dport);
52 return inet_ehashfn(sock_net(sk),
53 sk->sk_rcv_saddr, sk->sk_num,
54 sk->sk_daddr, sk->sk_dport);
58 * Allocate and initialize a new local port bind bucket.
59 * The bindhash mutex for snum's hash chain must be held here.
61 struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
63 struct inet_bind_hashbucket *head,
64 const unsigned short snum,
67 struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
70 write_pnet(&tb->ib_net, net);
74 tb->fastreuseport = 0;
75 INIT_HLIST_HEAD(&tb->owners);
76 hlist_add_head(&tb->node, &head->chain);
82 * Caller must hold hashbucket lock for this tb with local BH disabled
84 void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb)
86 if (hlist_empty(&tb->owners)) {
87 __hlist_del(&tb->node);
88 kmem_cache_free(cachep, tb);
92 void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
93 const unsigned short snum)
95 inet_sk(sk)->inet_num = snum;
96 sk_add_bind_node(sk, &tb->owners);
97 inet_csk(sk)->icsk_bind_hash = tb;
101 * Get rid of any references to a local port held by the given sock.
103 static void __inet_put_port(struct sock *sk)
105 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
106 const int bhash = inet_bhashfn(sock_net(sk), inet_sk(sk)->inet_num,
107 hashinfo->bhash_size);
108 struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash];
109 struct inet_bind_bucket *tb;
111 spin_lock(&head->lock);
112 tb = inet_csk(sk)->icsk_bind_hash;
113 __sk_del_bind_node(sk);
114 inet_csk(sk)->icsk_bind_hash = NULL;
115 inet_sk(sk)->inet_num = 0;
116 inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
117 spin_unlock(&head->lock);
120 void inet_put_port(struct sock *sk)
126 EXPORT_SYMBOL(inet_put_port);
128 int __inet_inherit_port(const struct sock *sk, struct sock *child)
130 struct inet_hashinfo *table = sk->sk_prot->h.hashinfo;
131 unsigned short port = inet_sk(child)->inet_num;
132 const int bhash = inet_bhashfn(sock_net(sk), port,
134 struct inet_bind_hashbucket *head = &table->bhash[bhash];
135 struct inet_bind_bucket *tb;
138 spin_lock(&head->lock);
139 tb = inet_csk(sk)->icsk_bind_hash;
141 spin_unlock(&head->lock);
144 if (tb->port != port) {
145 l3mdev = inet_sk_bound_l3mdev(sk);
147 /* NOTE: using tproxy and redirecting skbs to a proxy
148 * on a different listener port breaks the assumption
149 * that the listener socket's icsk_bind_hash is the same
150 * as that of the child socket. We have to look up or
151 * create a new bind bucket for the child here. */
152 inet_bind_bucket_for_each(tb, &head->chain) {
153 if (net_eq(ib_net(tb), sock_net(sk)) &&
154 tb->l3mdev == l3mdev && tb->port == port)
158 tb = inet_bind_bucket_create(table->bind_bucket_cachep,
159 sock_net(sk), head, port,
162 spin_unlock(&head->lock);
166 inet_csk_update_fastreuse(tb, child);
168 inet_bind_hash(child, tb, port);
169 spin_unlock(&head->lock);
173 EXPORT_SYMBOL_GPL(__inet_inherit_port);
175 static struct inet_listen_hashbucket *
176 inet_lhash2_bucket_sk(struct inet_hashinfo *h, struct sock *sk)
180 #if IS_ENABLED(CONFIG_IPV6)
181 if (sk->sk_family == AF_INET6)
182 hash = ipv6_portaddr_hash(sock_net(sk),
183 &sk->sk_v6_rcv_saddr,
184 inet_sk(sk)->inet_num);
187 hash = ipv4_portaddr_hash(sock_net(sk),
188 inet_sk(sk)->inet_rcv_saddr,
189 inet_sk(sk)->inet_num);
190 return inet_lhash2_bucket(h, hash);
193 static void inet_hash2(struct inet_hashinfo *h, struct sock *sk)
195 struct inet_listen_hashbucket *ilb2;
200 ilb2 = inet_lhash2_bucket_sk(h, sk);
202 spin_lock(&ilb2->lock);
203 if (sk->sk_reuseport && sk->sk_family == AF_INET6)
204 hlist_add_tail_rcu(&inet_csk(sk)->icsk_listen_portaddr_node,
207 hlist_add_head_rcu(&inet_csk(sk)->icsk_listen_portaddr_node,
210 spin_unlock(&ilb2->lock);
213 static void inet_unhash2(struct inet_hashinfo *h, struct sock *sk)
215 struct inet_listen_hashbucket *ilb2;
218 WARN_ON_ONCE(hlist_unhashed(&inet_csk(sk)->icsk_listen_portaddr_node)))
221 ilb2 = inet_lhash2_bucket_sk(h, sk);
223 spin_lock(&ilb2->lock);
224 hlist_del_init_rcu(&inet_csk(sk)->icsk_listen_portaddr_node);
226 spin_unlock(&ilb2->lock);
229 static inline int compute_score(struct sock *sk, struct net *net,
230 const unsigned short hnum, const __be32 daddr,
231 const int dif, const int sdif)
235 if (net_eq(sock_net(sk), net) && sk->sk_num == hnum &&
236 !ipv6_only_sock(sk)) {
237 if (sk->sk_rcv_saddr != daddr)
240 if (!inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
243 score = sk->sk_family == PF_INET ? 2 : 1;
244 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
250 static inline struct sock *lookup_reuseport(struct net *net, struct sock *sk,
251 struct sk_buff *skb, int doff,
252 __be32 saddr, __be16 sport,
253 __be32 daddr, unsigned short hnum)
255 struct sock *reuse_sk = NULL;
258 if (sk->sk_reuseport) {
259 phash = inet_ehashfn(net, daddr, hnum, saddr, sport);
260 reuse_sk = reuseport_select_sock(sk, phash, skb, doff);
266 * Here are some nice properties to exploit here. The BSD API
267 * does not allow a listening sock to specify the remote port nor the
268 * remote address for the connection. So always assume those are both
269 * wildcarded during the search since they can never be otherwise.
272 /* called with rcu_read_lock() : No refcount taken on the socket */
273 static struct sock *inet_lhash2_lookup(struct net *net,
274 struct inet_listen_hashbucket *ilb2,
275 struct sk_buff *skb, int doff,
276 const __be32 saddr, __be16 sport,
277 const __be32 daddr, const unsigned short hnum,
278 const int dif, const int sdif)
280 struct inet_connection_sock *icsk;
281 struct sock *sk, *result = NULL;
282 int score, hiscore = 0;
284 inet_lhash2_for_each_icsk_rcu(icsk, &ilb2->head) {
285 sk = (struct sock *)icsk;
286 score = compute_score(sk, net, hnum, daddr, dif, sdif);
287 if (score > hiscore) {
288 result = lookup_reuseport(net, sk, skb, doff,
289 saddr, sport, daddr, hnum);
301 static inline struct sock *inet_lookup_run_bpf(struct net *net,
302 struct inet_hashinfo *hashinfo,
303 struct sk_buff *skb, int doff,
304 __be32 saddr, __be16 sport,
305 __be32 daddr, u16 hnum)
307 struct sock *sk, *reuse_sk;
310 if (hashinfo != &tcp_hashinfo)
311 return NULL; /* only TCP is supported */
313 no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_TCP,
314 saddr, sport, daddr, hnum, &sk);
315 if (no_reuseport || IS_ERR_OR_NULL(sk))
318 reuse_sk = lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
324 struct sock *__inet_lookup_listener(struct net *net,
325 struct inet_hashinfo *hashinfo,
326 struct sk_buff *skb, int doff,
327 const __be32 saddr, __be16 sport,
328 const __be32 daddr, const unsigned short hnum,
329 const int dif, const int sdif)
331 struct inet_listen_hashbucket *ilb2;
332 struct sock *result = NULL;
335 /* Lookup redirect from BPF */
336 if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
337 result = inet_lookup_run_bpf(net, hashinfo, skb, doff,
338 saddr, sport, daddr, hnum);
343 hash2 = ipv4_portaddr_hash(net, daddr, hnum);
344 ilb2 = inet_lhash2_bucket(hashinfo, hash2);
346 result = inet_lhash2_lookup(net, ilb2, skb, doff,
347 saddr, sport, daddr, hnum,
352 /* Lookup lhash2 with INADDR_ANY */
353 hash2 = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum);
354 ilb2 = inet_lhash2_bucket(hashinfo, hash2);
356 result = inet_lhash2_lookup(net, ilb2, skb, doff,
357 saddr, sport, htonl(INADDR_ANY), hnum,
364 EXPORT_SYMBOL_GPL(__inet_lookup_listener);
366 /* All sockets share common refcount, but have different destructors */
367 void sock_gen_put(struct sock *sk)
369 if (!refcount_dec_and_test(&sk->sk_refcnt))
372 if (sk->sk_state == TCP_TIME_WAIT)
373 inet_twsk_free(inet_twsk(sk));
374 else if (sk->sk_state == TCP_NEW_SYN_RECV)
375 reqsk_free(inet_reqsk(sk));
379 EXPORT_SYMBOL_GPL(sock_gen_put);
381 void sock_edemux(struct sk_buff *skb)
383 sock_gen_put(skb->sk);
385 EXPORT_SYMBOL(sock_edemux);
387 struct sock *__inet_lookup_established(struct net *net,
388 struct inet_hashinfo *hashinfo,
389 const __be32 saddr, const __be16 sport,
390 const __be32 daddr, const u16 hnum,
391 const int dif, const int sdif)
393 INET_ADDR_COOKIE(acookie, saddr, daddr);
394 const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
396 const struct hlist_nulls_node *node;
397 /* Optimize here for direct hit, only listening connections can
398 * have wildcards anyways.
400 unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport);
401 unsigned int slot = hash & hashinfo->ehash_mask;
402 struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
405 sk_nulls_for_each_rcu(sk, node, &head->chain) {
406 if (sk->sk_hash != hash)
408 if (likely(INET_MATCH(sk, net, acookie,
409 saddr, daddr, ports, dif, sdif))) {
410 if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
412 if (unlikely(!INET_MATCH(sk, net, acookie,
422 * if the nulls value we got at the end of this lookup is
423 * not the expected one, we must restart lookup.
424 * We probably met an item that was moved to another chain.
426 if (get_nulls_value(node) != slot)
433 EXPORT_SYMBOL_GPL(__inet_lookup_established);
435 /* called with local bh disabled */
436 static int __inet_check_established(struct inet_timewait_death_row *death_row,
437 struct sock *sk, __u16 lport,
438 struct inet_timewait_sock **twp)
440 struct inet_hashinfo *hinfo = death_row->hashinfo;
441 struct inet_sock *inet = inet_sk(sk);
442 __be32 daddr = inet->inet_rcv_saddr;
443 __be32 saddr = inet->inet_daddr;
444 int dif = sk->sk_bound_dev_if;
445 struct net *net = sock_net(sk);
446 int sdif = l3mdev_master_ifindex_by_index(net, dif);
447 INET_ADDR_COOKIE(acookie, saddr, daddr);
448 const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
449 unsigned int hash = inet_ehashfn(net, daddr, lport,
450 saddr, inet->inet_dport);
451 struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
452 spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
454 const struct hlist_nulls_node *node;
455 struct inet_timewait_sock *tw = NULL;
459 sk_nulls_for_each(sk2, node, &head->chain) {
460 if (sk2->sk_hash != hash)
463 if (likely(INET_MATCH(sk2, net, acookie,
464 saddr, daddr, ports, dif, sdif))) {
465 if (sk2->sk_state == TCP_TIME_WAIT) {
467 if (twsk_unique(sk, sk2, twp))
474 /* Must record num and sport now. Otherwise we will see
475 * in hash table socket with a funny identity.
477 inet->inet_num = lport;
478 inet->inet_sport = htons(lport);
480 WARN_ON(!sk_unhashed(sk));
481 __sk_nulls_add_node_rcu(sk, &head->chain);
483 sk_nulls_del_node_init_rcu((struct sock *)tw);
484 __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
487 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
492 /* Silly. Should hash-dance instead... */
493 inet_twsk_deschedule_put(tw);
499 return -EADDRNOTAVAIL;
502 static u32 inet_sk_port_offset(const struct sock *sk)
504 const struct inet_sock *inet = inet_sk(sk);
506 return secure_ipv4_port_ephemeral(inet->inet_rcv_saddr,
511 /* insert a socket into ehash, and eventually remove another one
512 * (The another one can be a SYN_RECV or TIMEWAIT
514 bool inet_ehash_insert(struct sock *sk, struct sock *osk)
516 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
517 struct hlist_nulls_head *list;
518 struct inet_ehash_bucket *head;
522 WARN_ON_ONCE(!sk_unhashed(sk));
524 sk->sk_hash = sk_ehashfn(sk);
525 head = inet_ehash_bucket(hashinfo, sk->sk_hash);
527 lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
531 WARN_ON_ONCE(sk->sk_hash != osk->sk_hash);
532 ret = sk_nulls_del_node_init_rcu(osk);
535 __sk_nulls_add_node_rcu(sk, list);
540 bool inet_ehash_nolisten(struct sock *sk, struct sock *osk)
542 bool ok = inet_ehash_insert(sk, osk);
545 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
547 percpu_counter_inc(sk->sk_prot->orphan_count);
548 inet_sk_set_state(sk, TCP_CLOSE);
549 sock_set_flag(sk, SOCK_DEAD);
550 inet_csk_destroy_sock(sk);
554 EXPORT_SYMBOL_GPL(inet_ehash_nolisten);
556 static int inet_reuseport_add_sock(struct sock *sk,
557 struct inet_listen_hashbucket *ilb)
559 struct inet_bind_bucket *tb = inet_csk(sk)->icsk_bind_hash;
560 const struct hlist_nulls_node *node;
562 kuid_t uid = sock_i_uid(sk);
564 sk_nulls_for_each_rcu(sk2, node, &ilb->nulls_head) {
566 sk2->sk_family == sk->sk_family &&
567 ipv6_only_sock(sk2) == ipv6_only_sock(sk) &&
568 sk2->sk_bound_dev_if == sk->sk_bound_dev_if &&
569 inet_csk(sk2)->icsk_bind_hash == tb &&
570 sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) &&
571 inet_rcv_saddr_equal(sk, sk2, false))
572 return reuseport_add_sock(sk, sk2,
573 inet_rcv_saddr_any(sk));
576 return reuseport_alloc(sk, inet_rcv_saddr_any(sk));
579 int __inet_hash(struct sock *sk, struct sock *osk)
581 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
582 struct inet_listen_hashbucket *ilb;
585 if (sk->sk_state != TCP_LISTEN) {
586 inet_ehash_nolisten(sk, osk);
589 WARN_ON(!sk_unhashed(sk));
590 ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
592 spin_lock(&ilb->lock);
593 if (sk->sk_reuseport) {
594 err = inet_reuseport_add_sock(sk, ilb);
598 if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
599 sk->sk_family == AF_INET6)
600 __sk_nulls_add_node_tail_rcu(sk, &ilb->nulls_head);
602 __sk_nulls_add_node_rcu(sk, &ilb->nulls_head);
603 inet_hash2(hashinfo, sk);
605 sock_set_flag(sk, SOCK_RCU_FREE);
606 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
608 spin_unlock(&ilb->lock);
612 EXPORT_SYMBOL(__inet_hash);
614 int inet_hash(struct sock *sk)
618 if (sk->sk_state != TCP_CLOSE) {
620 err = __inet_hash(sk, NULL);
626 EXPORT_SYMBOL_GPL(inet_hash);
628 void inet_unhash(struct sock *sk)
630 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
631 struct inet_listen_hashbucket *ilb = NULL;
637 if (sk->sk_state == TCP_LISTEN) {
638 ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
641 lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
647 if (rcu_access_pointer(sk->sk_reuseport_cb))
648 reuseport_detach_sock(sk);
650 inet_unhash2(hashinfo, sk);
653 __sk_nulls_del_node_init_rcu(sk);
654 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
656 spin_unlock_bh(lock);
658 EXPORT_SYMBOL_GPL(inet_unhash);
660 int __inet_hash_connect(struct inet_timewait_death_row *death_row,
661 struct sock *sk, u32 port_offset,
662 int (*check_established)(struct inet_timewait_death_row *,
663 struct sock *, __u16, struct inet_timewait_sock **))
665 struct inet_hashinfo *hinfo = death_row->hashinfo;
666 struct inet_timewait_sock *tw = NULL;
667 struct inet_bind_hashbucket *head;
668 int port = inet_sk(sk)->inet_num;
669 struct net *net = sock_net(sk);
670 struct inet_bind_bucket *tb;
671 u32 remaining, offset;
672 int ret, i, low, high;
677 head = &hinfo->bhash[inet_bhashfn(net, port,
679 tb = inet_csk(sk)->icsk_bind_hash;
680 spin_lock_bh(&head->lock);
681 if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) {
682 inet_ehash_nolisten(sk, NULL);
683 spin_unlock_bh(&head->lock);
686 spin_unlock(&head->lock);
687 /* No definite answer... Walk to established hash table */
688 ret = check_established(death_row, sk, port, NULL);
693 l3mdev = inet_sk_bound_l3mdev(sk);
695 inet_get_local_port_range(net, &low, &high);
696 high++; /* [32768, 60999] -> [32768, 61000[ */
697 remaining = high - low;
698 if (likely(remaining > 1))
701 offset = (hint + port_offset) % remaining;
702 /* In first pass we try ports of @low parity.
703 * inet_csk_get_port() does the opposite choice.
708 for (i = 0; i < remaining; i += 2, port += 2) {
709 if (unlikely(port >= high))
711 if (inet_is_local_reserved_port(net, port))
713 head = &hinfo->bhash[inet_bhashfn(net, port,
715 spin_lock_bh(&head->lock);
717 /* Does not bother with rcv_saddr checks, because
718 * the established check is already unique enough.
720 inet_bind_bucket_for_each(tb, &head->chain) {
721 if (net_eq(ib_net(tb), net) && tb->l3mdev == l3mdev &&
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,
735 net, head, port, l3mdev);
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_NULLS_HEAD(&h->listening_hash[i].nulls_head,
794 i + LISTENING_NULLS_BASE);
795 h->listening_hash[i].count = 0;
800 EXPORT_SYMBOL_GPL(inet_hashinfo_init);
802 static void init_hashinfo_lhash2(struct inet_hashinfo *h)
806 for (i = 0; i <= h->lhash2_mask; i++) {
807 spin_lock_init(&h->lhash2[i].lock);
808 INIT_HLIST_HEAD(&h->lhash2[i].head);
809 h->lhash2[i].count = 0;
813 void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
814 unsigned long numentries, int scale,
815 unsigned long low_limit,
816 unsigned long high_limit)
818 h->lhash2 = alloc_large_system_hash(name,
827 init_hashinfo_lhash2(h);
830 int inet_hashinfo2_init_mod(struct inet_hashinfo *h)
832 h->lhash2 = kmalloc_array(INET_LHTABLE_SIZE, sizeof(*h->lhash2), GFP_KERNEL);
836 h->lhash2_mask = INET_LHTABLE_SIZE - 1;
837 /* INET_LHTABLE_SIZE must be a power of 2 */
838 BUG_ON(INET_LHTABLE_SIZE & h->lhash2_mask);
840 init_hashinfo_lhash2(h);
843 EXPORT_SYMBOL_GPL(inet_hashinfo2_init_mod);
845 int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
847 unsigned int locksz = sizeof(spinlock_t);
848 unsigned int i, nblocks = 1;
851 /* allocate 2 cache lines or at least one spinlock per cpu */
852 nblocks = max(2U * L1_CACHE_BYTES / locksz, 1U);
853 nblocks = roundup_pow_of_two(nblocks * num_possible_cpus());
855 /* no more locks than number of hash buckets */
856 nblocks = min(nblocks, hashinfo->ehash_mask + 1);
858 hashinfo->ehash_locks = kvmalloc_array(nblocks, locksz, GFP_KERNEL);
859 if (!hashinfo->ehash_locks)
862 for (i = 0; i < nblocks; i++)
863 spin_lock_init(&hashinfo->ehash_locks[i]);
865 hashinfo->ehash_locks_mask = nblocks - 1;
868 EXPORT_SYMBOL_GPL(inet_ehash_locks_alloc);