[linux-block.git] / net / ipv6 / inet6_hashtables.c

/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Generic INET6 transport hashtables
 *
 * Authors:	Lotsa people, from code originally in tcp, generalised here
 *		by Arnaldo Carvalho de Melo <acme@mandriva.com>
 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/random.h>

#include <net/addrconf.h>
#include <net/inet_connection_sock.h>
#include <net/inet_hashtables.h>
#include <net/inet6_hashtables.h>
#include <net/secure_seq.h>
#include <net/ip.h>
#include <net/sock_reuseport.h>

u32 inet6_ehashfn(const struct net *net,
		  const struct in6_addr *laddr, const u16 lport,
		  const struct in6_addr *faddr, const __be16 fport)
{
	static u32 inet6_ehash_secret __read_mostly;
	static u32 ipv6_hash_secret __read_mostly;

	u32 lhash, fhash;

	net_get_random_once(&inet6_ehash_secret, sizeof(inet6_ehash_secret));
	net_get_random_once(&ipv6_hash_secret, sizeof(ipv6_hash_secret));

	lhash = (__force u32)laddr->s6_addr32[3];
	fhash = __ipv6_addr_jhash(faddr, ipv6_hash_secret);

	return __inet6_ehashfn(lhash, lport, fhash, fport,
			       inet6_ehash_secret + net_hash_mix(net));
}

/*
 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
 * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
 *
 * The sockhash lock must be held as a reader here.
 */
struct sock *__inet6_lookup_established(struct net *net,
					struct inet_hashinfo *hashinfo,
					   const struct in6_addr *saddr,
					   const __be16 sport,
					   const struct in6_addr *daddr,
					   const u16 hnum,
					   const int dif, const int sdif)
{
	struct sock *sk;
	const struct hlist_nulls_node *node;
	const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
	/* Optimize here for direct hit, only listening connections can
	 * have wildcards anyways.
	 */
	unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport);
	unsigned int slot = hash & hashinfo->ehash_mask;
	struct inet_ehash_bucket *head = &hashinfo->ehash[slot];


begin:
	sk_nulls_for_each_rcu(sk, node, &head->chain) {
		if (sk->sk_hash != hash)
			continue;
		if (!INET6_MATCH(sk, net, saddr, daddr, ports, dif, sdif))
			continue;
		if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
			goto out;

		if (unlikely(!INET6_MATCH(sk, net, saddr, daddr, ports, dif, sdif))) {
			sock_gen_put(sk);
			goto begin;
		}
		goto found;
	}
	if (get_nulls_value(node) != slot)
		goto begin;
out:
	sk = NULL;
found:
	return sk;
}
EXPORT_SYMBOL(__inet6_lookup_established);

static inline int compute_score(struct sock *sk, struct net *net,
				const unsigned short hnum,
				const struct in6_addr *daddr,
				const int dif, const int sdif, bool exact_dif)
{
	int score = -1;

	if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum &&
	    sk->sk_family == PF_INET6) {

		score = 1;
		if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
			if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
				return -1;
			score++;
		}
		if (sk->sk_bound_dev_if || exact_dif) {
			bool dev_match = (sk->sk_bound_dev_if == dif ||
					  sk->sk_bound_dev_if == sdif);

			if (!dev_match)
				return -1;
			if (sk->sk_bound_dev_if)
				score++;
		}
		if (sk->sk_incoming_cpu == raw_smp_processor_id())
			score++;
	}
	return score;
}

/* called with rcu_read_lock() */
static struct sock *inet6_lhash2_lookup(struct net *net,
		struct inet_listen_hashbucket *ilb2,
		struct sk_buff *skb, int doff,
		const struct in6_addr *saddr,
		const __be16 sport, const struct in6_addr *daddr,
		const unsigned short hnum, const int dif, const int sdif)
{
	bool exact_dif = inet6_exact_dif_match(net, skb);
	struct inet_connection_sock *icsk;
	struct sock *sk, *result = NULL;
	int score, hiscore = 0;
	u32 phash = 0;

	inet_lhash2_for_each_icsk_rcu(icsk, &ilb2->head) {
		sk = (struct sock *)icsk;
		score = compute_score(sk, net, hnum, daddr, dif, sdif,
				      exact_dif);
		if (score > hiscore) {
			if (sk->sk_reuseport) {
				phash = inet6_ehashfn(net, daddr, hnum,
						      saddr, sport);
				result = reuseport_select_sock(sk, phash,
							       skb, doff);
				if (result)
					return result;
			}
			result = sk;
			hiscore = score;
		}
	}

	return result;
}

struct sock *inet6_lookup_listener(struct net *net,
		struct inet_hashinfo *hashinfo,
		struct sk_buff *skb, int doff,
		const struct in6_addr *saddr,
		const __be16 sport, const struct in6_addr *daddr,
		const unsigned short hnum, const int dif, const int sdif)
{
	unsigned int hash = inet_lhashfn(net, hnum);
	struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
	bool exact_dif = inet6_exact_dif_match(net, skb);
	struct inet_listen_hashbucket *ilb2;
	struct sock *sk, *result = NULL;
	int score, hiscore = 0;
	unsigned int hash2;
	u32 phash = 0;

	if (ilb->count <= 10 || !hashinfo->lhash2)
		goto port_lookup;

	/* Too many sk in the ilb bucket (which is hashed by port alone).
	 * Try lhash2 (which is hashed by port and addr) instead.
	 */

	hash2 = ipv6_portaddr_hash(net, daddr, hnum);
	ilb2 = inet_lhash2_bucket(hashinfo, hash2);
	if (ilb2->count > ilb->count)
		goto port_lookup;

	result = inet6_lhash2_lookup(net, ilb2, skb, doff,
				     saddr, sport, daddr, hnum,
				     dif, sdif);
	if (result)
		return result;

	/* Lookup lhash2 with in6addr_any */

	hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
	ilb2 = inet_lhash2_bucket(hashinfo, hash2);
	if (ilb2->count > ilb->count)
		goto port_lookup;

	return inet6_lhash2_lookup(net, ilb2, skb, doff,
				   saddr, sport, daddr, hnum,
				   dif, sdif);

port_lookup:
	sk_for_each(sk, &ilb->head) {
		score = compute_score(sk, net, hnum, daddr, dif, sdif, exact_dif);
		if (score > hiscore) {
			if (sk->sk_reuseport) {
				phash = inet6_ehashfn(net, daddr, hnum,
						      saddr, sport);
				result = reuseport_select_sock(sk, phash,
							       skb, doff);
				if (result)
					return result;
			}
			result = sk;
			hiscore = score;
		}
	}
	return result;
}
EXPORT_SYMBOL_GPL(inet6_lookup_listener);

struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
			  struct sk_buff *skb, int doff,
			  const struct in6_addr *saddr, const __be16 sport,
			  const struct in6_addr *daddr, const __be16 dport,
			  const int dif)
{
	struct sock *sk;
	bool refcounted;

	sk = __inet6_lookup(net, hashinfo, skb, doff, saddr, sport, daddr,
			    ntohs(dport), dif, 0, &refcounted);
	if (sk && !refcounted && !refcount_inc_not_zero(&sk->sk_refcnt))
		sk = NULL;
	return sk;
}
EXPORT_SYMBOL_GPL(inet6_lookup);

static int __inet6_check_established(struct inet_timewait_death_row *death_row,
				     struct sock *sk, const __u16 lport,
				     struct inet_timewait_sock **twp)
{
	struct inet_hashinfo *hinfo = death_row->hashinfo;
	struct inet_sock *inet = inet_sk(sk);
	const struct in6_addr *daddr = &sk->sk_v6_rcv_saddr;
	const struct in6_addr *saddr = &sk->sk_v6_daddr;
	const int dif = sk->sk_bound_dev_if;
	struct net *net = sock_net(sk);
	const int sdif = l3mdev_master_ifindex_by_index(net, dif);
	const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
	const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr,
						inet->inet_dport);
	struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
	spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
	struct sock *sk2;
	const struct hlist_nulls_node *node;
	struct inet_timewait_sock *tw = NULL;

	spin_lock(lock);

	sk_nulls_for_each(sk2, node, &head->chain) {
		if (sk2->sk_hash != hash)
			continue;

		if (likely(INET6_MATCH(sk2, net, saddr, daddr, ports,
				       dif, sdif))) {
			if (sk2->sk_state == TCP_TIME_WAIT) {
				tw = inet_twsk(sk2);
				if (twsk_unique(sk, sk2, twp))
					break;
			}
			goto not_unique;
		}
	}

	/* Must record num and sport now. Otherwise we will see
	 * in hash table socket with a funny identity.
	 */
	inet->inet_num = lport;
	inet->inet_sport = htons(lport);
	sk->sk_hash = hash;
	WARN_ON(!sk_unhashed(sk));
	__sk_nulls_add_node_rcu(sk, &head->chain);
	if (tw) {
		sk_nulls_del_node_init_rcu((struct sock *)tw);
		__NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
	}
	spin_unlock(lock);
	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);

	if (twp) {
		*twp = tw;
	} else if (tw) {
		/* Silly. Should hash-dance instead... */
		inet_twsk_deschedule_put(tw);
	}
	return 0;

not_unique:
	spin_unlock(lock);
	return -EADDRNOTAVAIL;
}

static u32 inet6_sk_port_offset(const struct sock *sk)
{
	const struct inet_sock *inet = inet_sk(sk);

	return secure_ipv6_port_ephemeral(sk->sk_v6_rcv_saddr.s6_addr32,
					  sk->sk_v6_daddr.s6_addr32,
					  inet->inet_dport);
}

int inet6_hash_connect(struct inet_timewait_death_row *death_row,
		       struct sock *sk)
{
	u32 port_offset = 0;

	if (!inet_sk(sk)->inet_num)
		port_offset = inet6_sk_port_offset(sk);
	return __inet_hash_connect(death_row, sk, port_offset,
				   __inet6_check_established);
}
EXPORT_SYMBOL_GPL(inet6_hash_connect);

int inet6_hash(struct sock *sk)
{
	int err = 0;

	if (sk->sk_state != TCP_CLOSE) {
		local_bh_disable();
		err = __inet_hash(sk, NULL);
		local_bh_enable();
	}

	return err;
}
EXPORT_SYMBOL_GPL(inet6_hash);
Commit	Line	Data
5324a040 ACM	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* Generic INET6 transport hashtables
	7	*
d8313f5c	8	* Authors: Lotsa people, from code originally in tcp, generalised here
67ba4152	9	* by Arnaldo Carvalho de Melo <acme@mandriva.com>
5324a040 ACM	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* as published by the Free Software Foundation; either version
	14	* 2 of the License, or (at your option) any later version.
	15	*/
	16
5324a040	17	#include <linux/module.h>
d8313f5c	18	#include <linux/random.h>
5324a040	19
c125e80b	20	#include <net/addrconf.h>
5324a040 ACM	21	#include <net/inet_connection_sock.h>
	22	#include <net/inet_hashtables.h>
	23	#include <net/inet6_hashtables.h>
6e5714ea	24	#include <net/secure_seq.h>
d8313f5c	25	#include <net/ip.h>
c125e80b	26	#include <net/sock_reuseport.h>
5324a040	27
d1e559d0 ED	28	u32 inet6_ehashfn(const struct net *net,
	29	const struct in6_addr *laddr, const u16 lport,
	30	const struct in6_addr *faddr, const __be16 fport)
b50026b5	31	{
1bbdceef HFS	32	static u32 inet6_ehash_secret __read_mostly;
	33	static u32 ipv6_hash_secret __read_mostly;
	34
	35	u32 lhash, fhash;
	36
	37	net_get_random_once(&inet6_ehash_secret, sizeof(inet6_ehash_secret));
	38	net_get_random_once(&ipv6_hash_secret, sizeof(ipv6_hash_secret));
	39
	40	lhash = (__force u32)laddr->s6_addr32[3];
	41	fhash = __ipv6_addr_jhash(faddr, ipv6_hash_secret);
	42
b50026b5	43	return __inet6_ehashfn(lhash, lport, fhash, fport,
1bbdceef	44	inet6_ehash_secret + net_hash_mix(net));
b50026b5 HFS	45	}
b50026b5 HFS	46
b1a7ffcb DV	47	/*
	48	* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
	49	* we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
	50	*
	51	* The sockhash lock must be held as a reader here.
	52	*/
d86e0dac PE	53	struct sock __inet6_lookup_established(struct net net,
d86e0dac PE	54	struct inet_hashinfo *hashinfo,
b1a7ffcb	55	const struct in6_addr *saddr,
d2ecd9cc	56	const __be16 sport,
b1a7ffcb DV	57	const struct in6_addr *daddr,
b1a7ffcb DV	58	const u16 hnum,
4297a0ef	59	const int dif, const int sdif)
b1a7ffcb DV	60	{
b1a7ffcb DV	61	struct sock *sk;
3ab5aee7	62	const struct hlist_nulls_node *node;
4f765d84	63	const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
b1a7ffcb DV	64	/* Optimize here for direct hit, only listening connections can
	65	* have wildcards anyways.
	66	*/
33de014c	67	unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport);
f373b53b	68	unsigned int slot = hash & hashinfo->ehash_mask;
3ab5aee7	69	struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
b1a7ffcb	70
3ab5aee7	71
3ab5aee7 ED	72	begin:
3ab5aee7 ED	73	sk_nulls_for_each_rcu(sk, node, &head->chain) {
ce43b03e ED	74	if (sk->sk_hash != hash)
ce43b03e ED	75	continue;
4297a0ef	76	if (!INET6_MATCH(sk, net, saddr, daddr, ports, dif, sdif))
efe4208f	77	continue;
41c6d650	78	if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
05dbc7b5 ED	79	goto out;
05dbc7b5 ED	80
4297a0ef	81	if (unlikely(!INET6_MATCH(sk, net, saddr, daddr, ports, dif, sdif))) {
efe4208f ED	82	sock_gen_put(sk);
efe4208f ED	83	goto begin;
3ab5aee7	84	}
efe4208f	85	goto found;
b1a7ffcb	86	}
3ab5aee7 ED	87	if (get_nulls_value(node) != slot)
3ab5aee7 ED	88	goto begin;
3ab5aee7	89	out:
05dbc7b5 ED	90	sk = NULL;
05dbc7b5 ED	91	found:
b1a7ffcb DV	92	return sk;
	93	}
	94	EXPORT_SYMBOL(__inet6_lookup_established);
	95
42b16b3f	96	static inline int compute_score(struct sock sk, struct net net,
c25eb3bf ED	97	const unsigned short hnum,
c25eb3bf ED	98	const struct in6_addr *daddr,
4297a0ef	99	const int dif, const int sdif, bool exact_dif)
c25eb3bf ED	100	{
	101	int score = -1;
	102
c720c7e8	103	if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum &&
c25eb3bf	104	sk->sk_family == PF_INET6) {
c25eb3bf ED	105
c25eb3bf ED	106	score = 1;
efe4208f ED	107	if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
efe4208f ED	108	if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
c25eb3bf ED	109	return -1;
	110	score++;
	111	}
a04a480d	112	if (sk->sk_bound_dev_if \|\| exact_dif) {
4297a0ef DA	113	bool dev_match = (sk->sk_bound_dev_if == dif \|\|
	114	sk->sk_bound_dev_if == sdif);
	115
8c43bd17	116	if (!dev_match)
c25eb3bf	117	return -1;
8c43bd17	118	if (sk->sk_bound_dev_if)
4297a0ef	119	score++;
c25eb3bf	120	}
70da268b ED	121	if (sk->sk_incoming_cpu == raw_smp_processor_id())
70da268b ED	122	score++;
c25eb3bf ED	123	}
	124	return score;
	125	}
	126
3b24d854	127	/* called with rcu_read_lock() */
61b7c691 MKL	128	static struct sock inet6_lhash2_lookup(struct net net,
	129	struct inet_listen_hashbucket *ilb2,
	130	struct sk_buff *skb, int doff,
	131	const struct in6_addr *saddr,
	132	const __be16 sport, const struct in6_addr *daddr,
	133	const unsigned short hnum, const int dif, const int sdif)
	134	{
	135	bool exact_dif = inet6_exact_dif_match(net, skb);
	136	struct inet_connection_sock *icsk;
	137	struct sock sk, result = NULL;
	138	int score, hiscore = 0;
	139	u32 phash = 0;
	140
	141	inet_lhash2_for_each_icsk_rcu(icsk, &ilb2->head) {
	142	sk = (struct sock *)icsk;
	143	score = compute_score(sk, net, hnum, daddr, dif, sdif,
	144	exact_dif);
	145	if (score > hiscore) {
	146	if (sk->sk_reuseport) {
	147	phash = inet6_ehashfn(net, daddr, hnum,
	148	saddr, sport);
	149	result = reuseport_select_sock(sk, phash,
	150	skb, doff);
	151	if (result)
	152	return result;
	153	}
	154	result = sk;
	155	hiscore = score;
	156	}
	157	}
	158
	159	return result;
	160	}
	161
d86e0dac	162	struct sock inet6_lookup_listener(struct net net,
a583636a CG	163	struct inet_hashinfo *hashinfo,
	164	struct sk_buff *skb, int doff,
	165	const struct in6_addr *saddr,
5ba24953	166	const __be16 sport, const struct in6_addr *daddr,
4297a0ef	167	const unsigned short hnum, const int dif, const int sdif)
5324a040	168	{
c25eb3bf ED	169	unsigned int hash = inet_lhashfn(net, hnum);
c25eb3bf ED	170	struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
a04a480d	171	bool exact_dif = inet6_exact_dif_match(net, skb);
61b7c691	172	struct inet_listen_hashbucket *ilb2;
3b24d854	173	struct sock sk, result = NULL;
e94a62f5	174	int score, hiscore = 0;
61b7c691	175	unsigned int hash2;
3b24d854	176	u32 phash = 0;
c25eb3bf	177
61b7c691 MKL	178	if (ilb->count <= 10 \|\| !hashinfo->lhash2)
	179	goto port_lookup;
	180
	181	/* Too many sk in the ilb bucket (which is hashed by port alone).
	182	* Try lhash2 (which is hashed by port and addr) instead.
	183	*/
	184
	185	hash2 = ipv6_portaddr_hash(net, daddr, hnum);
	186	ilb2 = inet_lhash2_bucket(hashinfo, hash2);
	187	if (ilb2->count > ilb->count)
	188	goto port_lookup;
	189
	190	result = inet6_lhash2_lookup(net, ilb2, skb, doff,
	191	saddr, sport, daddr, hnum,
	192	dif, sdif);
	193	if (result)
	194	return result;
	195
	196	/* Lookup lhash2 with in6addr_any */
	197
	198	hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
	199	ilb2 = inet_lhash2_bucket(hashinfo, hash2);
	200	if (ilb2->count > ilb->count)
	201	goto port_lookup;
	202
	203	return inet6_lhash2_lookup(net, ilb2, skb, doff,
	204	saddr, sport, daddr, hnum,
	205	dif, sdif);
	206
	207	port_lookup:
3b24d854	208	sk_for_each(sk, &ilb->head) {
4297a0ef	209	score = compute_score(sk, net, hnum, daddr, dif, sdif, exact_dif);
c25eb3bf	210	if (score > hiscore) {
e94a62f5	211	if (sk->sk_reuseport) {
5ba24953 TH	212	phash = inet6_ehashfn(net, daddr, hnum,
5ba24953 TH	213	saddr, sport);
3b24d854 ED	214	result = reuseport_select_sock(sk, phash,
	215	skb, doff);
	216	if (result)
	217	return result;
5ba24953	218	}
3b24d854	219	result = sk;
03c5b534	220	hiscore = score;
5324a040 ACM	221	}
5324a040 ACM	222	}
5324a040 ACM	223	return result;
5324a040 ACM	224	}
5324a040 ACM	225	EXPORT_SYMBOL_GPL(inet6_lookup_listener);
5324a040 ACM	226
d86e0dac	227	struct sock inet6_lookup(struct net net, struct inet_hashinfo *hashinfo,
a583636a	228	struct sk_buff *skb, int doff,
d2ecd9cc AV	229	const struct in6_addr *saddr, const __be16 sport,
d2ecd9cc AV	230	const struct in6_addr *daddr, const __be16 dport,
5324a040 ACM	231	const int dif)
	232	{
	233	struct sock *sk;
3b24d854	234	bool refcounted;
5324a040	235
a583636a	236	sk = __inet6_lookup(net, hashinfo, skb, doff, saddr, sport, daddr,
4297a0ef	237	ntohs(dport), dif, 0, &refcounted);
41c6d650	238	if (sk && !refcounted && !refcount_inc_not_zero(&sk->sk_refcnt))
3b24d854	239	sk = NULL;
5324a040 ACM	240	return sk;
5324a040 ACM	241	}
5324a040	242	EXPORT_SYMBOL_GPL(inet6_lookup);
d8313f5c ACM	243
	244	static int __inet6_check_established(struct inet_timewait_death_row *death_row,
	245	struct sock *sk, const __u16 lport,
	246	struct inet_timewait_sock **twp)
	247	{
	248	struct inet_hashinfo *hinfo = death_row->hashinfo;
3759fa9c	249	struct inet_sock *inet = inet_sk(sk);
efe4208f ED	250	const struct in6_addr *daddr = &sk->sk_v6_rcv_saddr;
efe4208f ED	251	const struct in6_addr *saddr = &sk->sk_v6_daddr;
d8313f5c	252	const int dif = sk->sk_bound_dev_if;
33de014c	253	struct net *net = sock_net(sk);
4297a0ef DA	254	const int sdif = l3mdev_master_ifindex_by_index(net, dif);
4297a0ef DA	255	const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
33de014c	256	const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr,
c720c7e8	257	inet->inet_dport);
d8313f5c	258	struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
9db66bdc	259	spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
d8313f5c	260	struct sock *sk2;
3ab5aee7	261	const struct hlist_nulls_node *node;
05dbc7b5	262	struct inet_timewait_sock *tw = NULL;
d8313f5c	263
9db66bdc	264	spin_lock(lock);
d8313f5c	265
05dbc7b5	266	sk_nulls_for_each(sk2, node, &head->chain) {
ce43b03e ED	267	if (sk2->sk_hash != hash)
ce43b03e ED	268	continue;
d8313f5c	269
4297a0ef DA	270	if (likely(INET6_MATCH(sk2, net, saddr, daddr, ports,
4297a0ef DA	271	dif, sdif))) {
efe4208f	272	if (sk2->sk_state == TCP_TIME_WAIT) {
05dbc7b5 ED	273	tw = inet_twsk(sk2);
05dbc7b5 ED	274	if (twsk_unique(sk, sk2, twp))
efe4208f	275	break;
05dbc7b5	276	}
d8313f5c	277	goto not_unique;
efe4208f	278	}
d8313f5c ACM	279	}
d8313f5c ACM	280
3759fa9c	281	/* Must record num and sport now. Otherwise we will see
efe4208f ED	282	* in hash table socket with a funny identity.
efe4208f ED	283	*/
c720c7e8 ED	284	inet->inet_num = lport;
c720c7e8 ED	285	inet->inet_sport = htons(lport);
13475a30	286	sk->sk_hash = hash;
547b792c	287	WARN_ON(!sk_unhashed(sk));
3ab5aee7	288	__sk_nulls_add_node_rcu(sk, &head->chain);
13475a30	289	if (tw) {
fc01538f	290	sk_nulls_del_node_init_rcu((struct sock *)tw);
02a1d6e7	291	__NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
13475a30	292	}
9db66bdc	293	spin_unlock(lock);
c29a0bc4	294	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
d8313f5c	295
13475a30	296	if (twp) {
d8313f5c	297	*twp = tw;
13475a30	298	} else if (tw) {
d8313f5c	299	/* Silly. Should hash-dance instead... */
dbe7faa4	300	inet_twsk_deschedule_put(tw);
d8313f5c ACM	301	}
	302	return 0;
	303
	304	not_unique:
9db66bdc	305	spin_unlock(lock);
d8313f5c ACM	306	return -EADDRNOTAVAIL;
	307	}
	308
e2baad9e	309	static u32 inet6_sk_port_offset(const struct sock *sk)
d8313f5c ACM	310	{
d8313f5c ACM	311	const struct inet_sock *inet = inet_sk(sk);
efe4208f ED	312
	313	return secure_ipv6_port_ephemeral(sk->sk_v6_rcv_saddr.s6_addr32,
	314	sk->sk_v6_daddr.s6_addr32,
c720c7e8	315	inet->inet_dport);
d8313f5c ACM	316	}
	317
	318	int inet6_hash_connect(struct inet_timewait_death_row *death_row,
	319	struct sock *sk)
	320	{
e2baad9e ED	321	u32 port_offset = 0;
	322
	323	if (!inet_sk(sk)->inet_num)
	324	port_offset = inet6_sk_port_offset(sk);
	325	return __inet_hash_connect(death_row, sk, port_offset,
b4d6444e	326	__inet6_check_established);
d8313f5c	327	}
d8313f5c	328	EXPORT_SYMBOL_GPL(inet6_hash_connect);
496611d7 CG	329
	330	int inet6_hash(struct sock *sk)
	331	{
e4cabca5 CG	332	int err = 0;
e4cabca5 CG	333
496611d7 CG	334	if (sk->sk_state != TCP_CLOSE) {
496611d7 CG	335	local_bh_disable();
fe38d2a1	336	err = __inet_hash(sk, NULL);
496611d7 CG	337	local_bh_enable();
	338	}
	339
e4cabca5	340	return err;
496611d7 CG	341	}
496611d7 CG	342	EXPORT_SYMBOL_GPL(inet6_hash);