[deliverable/linux.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/inet_connection_sock.h>
#include <net/inet_hashtables.h>
#include <net/inet6_hashtables.h>
#include <net/secure_seq.h>
#include <net/ip.h>

static unsigned int inet6_ehashfn(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));
}

static int inet6_sk_ehashfn(const struct sock *sk)
{
	const struct inet_sock *inet = inet_sk(sk);
	const struct in6_addr *laddr = &sk->sk_v6_rcv_saddr;
	const struct in6_addr *faddr = &sk->sk_v6_daddr;
	const __u16 lport = inet->inet_num;
	const __be16 fport = inet->inet_dport;
	struct net *net = sock_net(sk);

	return inet6_ehashfn(net, laddr, lport, faddr, fport);
}

int __inet6_hash(struct sock *sk, struct inet_timewait_sock *tw)
{
	struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
	int twrefcnt = 0;

	WARN_ON(!sk_unhashed(sk));

	if (sk->sk_state == TCP_LISTEN) {
		struct inet_listen_hashbucket *ilb;

		ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
		spin_lock(&ilb->lock);
		__sk_nulls_add_node_rcu(sk, &ilb->head);
		spin_unlock(&ilb->lock);
	} else {
		unsigned int hash;
		struct hlist_nulls_head *list;
		spinlock_t *lock;

		sk->sk_hash = hash = inet6_sk_ehashfn(sk);
		list = &inet_ehash_bucket(hashinfo, hash)->chain;
		lock = inet_ehash_lockp(hashinfo, hash);
		spin_lock(lock);
		__sk_nulls_add_node_rcu(sk, list);
		if (tw) {
			WARN_ON(sk->sk_hash != tw->tw_hash);
			twrefcnt = inet_twsk_unhash(tw);
		}
		spin_unlock(lock);
	}

	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
	return twrefcnt;
}
EXPORT_SYMBOL(__inet6_hash);

/*
 * 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)
{
	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];


	rcu_read_lock();
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))
			continue;
		if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt)))
			goto out;

		if (unlikely(!INET6_MATCH(sk, net, saddr, daddr, ports, dif))) {
			sock_gen_put(sk);
			goto begin;
		}
		goto found;
	}
	if (get_nulls_value(node) != slot)
		goto begin;
out:
	sk = NULL;
found:
	rcu_read_unlock();
	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)
{
	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) {
			if (sk->sk_bound_dev_if != dif)
				return -1;
			score++;
		}
	}
	return score;
}

struct sock *inet6_lookup_listener(struct net *net,
		struct inet_hashinfo *hashinfo, const struct in6_addr *saddr,
		const __be16 sport, const struct in6_addr *daddr,
		const unsigned short hnum, const int dif)
{
	struct sock *sk;
	const struct hlist_nulls_node *node;
	struct sock *result;
	int score, hiscore, matches = 0, reuseport = 0;
	u32 phash = 0;
	unsigned int hash = inet_lhashfn(net, hnum);
	struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];

	rcu_read_lock();
begin:
	result = NULL;
	hiscore = 0;
	sk_nulls_for_each(sk, node, &ilb->head) {
		score = compute_score(sk, net, hnum, daddr, dif);
		if (score > hiscore) {
			hiscore = score;
			result = sk;
			reuseport = sk->sk_reuseport;
			if (reuseport) {
				phash = inet6_ehashfn(net, daddr, hnum,
						      saddr, sport);
				matches = 1;
			}
		} else if (score == hiscore && reuseport) {
			matches++;
			if (((u64)phash * matches) >> 32 == 0)
				result = sk;
			phash = next_pseudo_random32(phash);
		}
	}
	/*
	 * if the nulls value we got at the end of this lookup is
	 * not the expected one, we must restart lookup.
	 * We probably met an item that was moved to another chain.
	 */
	if (get_nulls_value(node) != hash + LISTENING_NULLS_BASE)
		goto begin;
	if (result) {
		if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
			result = NULL;
		else if (unlikely(compute_score(result, net, hnum, daddr,
				  dif) < hiscore)) {
			sock_put(result);
			goto begin;
		}
	}
	rcu_read_unlock();
	return result;
}

EXPORT_SYMBOL_GPL(inet6_lookup_listener);

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

	local_bh_disable();
	sk = __inet6_lookup(net, hashinfo, saddr, sport, daddr, ntohs(dport), dif);
	local_bh_enable();

	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;
	const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
	struct net *net = sock_net(sk);
	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;
	int twrefcnt = 0;

	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))) {
			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) {
		twrefcnt = inet_twsk_unhash(tw);
		NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED);
	}
	spin_unlock(lock);
	if (twrefcnt)
		inet_twsk_put(tw);
	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(tw, death_row);

		inet_twsk_put(tw);
	}
	return 0;

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

static inline 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)
{
	return __inet_hash_connect(death_row, sk, inet6_sk_port_offset(sk),
			__inet6_check_established, __inet6_hash);
}

EXPORT_SYMBOL_GPL(inet6_hash_connect);
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 ACM	8	* Authors: Lotsa people, from code originally in tcp, generalised here
d8313f5c ACM	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 ACM	19
	20	#include <net/inet_connection_sock.h>
	21	#include <net/inet_hashtables.h>
	22	#include <net/inet6_hashtables.h>
6e5714ea	23	#include <net/secure_seq.h>
d8313f5c	24	#include <net/ip.h>
5324a040	25
b50026b5 HFS	26	static unsigned int inet6_ehashfn(struct net *net,
	27	const struct in6_addr *laddr,
	28	const u16 lport,
	29	const struct in6_addr *faddr,
	30	const __be16 fport)
	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	}
	46
	47	static int inet6_sk_ehashfn(const struct sock *sk)
	48	{
	49	const struct inet_sock *inet = inet_sk(sk);
	50	const struct in6_addr *laddr = &sk->sk_v6_rcv_saddr;
	51	const struct in6_addr *faddr = &sk->sk_v6_daddr;
	52	const __u16 lport = inet->inet_num;
	53	const __be16 fport = inet->inet_dport;
	54	struct net *net = sock_net(sk);
	55
	56	return inet6_ehashfn(net, laddr, lport, faddr, fport);
	57	}
	58
9327f705	59	int __inet6_hash(struct sock sk, struct inet_timewait_sock tw)
b1a7ffcb	60	{
39d8cda7	61	struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
9327f705	62	int twrefcnt = 0;
b1a7ffcb	63
547b792c	64	WARN_ON(!sk_unhashed(sk));
b1a7ffcb DV	65
b1a7ffcb DV	66	if (sk->sk_state == TCP_LISTEN) {
5caea4ea	67	struct inet_listen_hashbucket *ilb;
3ab5aee7	68
5caea4ea ED	69	ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
5caea4ea ED	70	spin_lock(&ilb->lock);
c25eb3bf	71	__sk_nulls_add_node_rcu(sk, &ilb->head);
5caea4ea	72	spin_unlock(&ilb->lock);
b1a7ffcb DV	73	} else {
b1a7ffcb DV	74	unsigned int hash;
3ab5aee7	75	struct hlist_nulls_head *list;
9db66bdc	76	spinlock_t *lock;
3ab5aee7	77
b1a7ffcb	78	sk->sk_hash = hash = inet6_sk_ehashfn(sk);
230140cf ED	79	list = &inet_ehash_bucket(hashinfo, hash)->chain;
230140cf ED	80	lock = inet_ehash_lockp(hashinfo, hash);
9db66bdc	81	spin_lock(lock);
3ab5aee7	82	__sk_nulls_add_node_rcu(sk, list);
9327f705 ED	83	if (tw) {
	84	WARN_ON(sk->sk_hash != tw->tw_hash);
	85	twrefcnt = inet_twsk_unhash(tw);
	86	}
9db66bdc	87	spin_unlock(lock);
b1a7ffcb DV	88	}
b1a7ffcb DV	89
c29a0bc4	90	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
9327f705	91	return twrefcnt;
b1a7ffcb DV	92	}
	93	EXPORT_SYMBOL(__inet6_hash);
	94
	95	/*
	96	* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
	97	* we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
	98	*
	99	* The sockhash lock must be held as a reader here.
	100	*/
d86e0dac PE	101	struct sock __inet6_lookup_established(struct net net,
d86e0dac PE	102	struct inet_hashinfo *hashinfo,
b1a7ffcb	103	const struct in6_addr *saddr,
d2ecd9cc	104	const __be16 sport,
b1a7ffcb DV	105	const struct in6_addr *daddr,
	106	const u16 hnum,
	107	const int dif)
	108	{
	109	struct sock *sk;
3ab5aee7	110	const struct hlist_nulls_node *node;
4f765d84	111	const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
b1a7ffcb DV	112	/* Optimize here for direct hit, only listening connections can
	113	* have wildcards anyways.
	114	*/
33de014c	115	unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport);
f373b53b	116	unsigned int slot = hash & hashinfo->ehash_mask;
3ab5aee7	117	struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
b1a7ffcb	118
3ab5aee7 ED	119
	120	rcu_read_lock();
	121	begin:
	122	sk_nulls_for_each_rcu(sk, node, &head->chain) {
ce43b03e ED	123	if (sk->sk_hash != hash)
ce43b03e ED	124	continue;
efe4208f ED	125	if (!INET6_MATCH(sk, net, saddr, daddr, ports, dif))
efe4208f ED	126	continue;
05dbc7b5 ED	127	if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt)))
	128	goto out;
	129
efe4208f ED	130	if (unlikely(!INET6_MATCH(sk, net, saddr, daddr, ports, dif))) {
	131	sock_gen_put(sk);
	132	goto begin;
3ab5aee7	133	}
efe4208f	134	goto found;
b1a7ffcb	135	}
3ab5aee7 ED	136	if (get_nulls_value(node) != slot)
3ab5aee7 ED	137	goto begin;
3ab5aee7	138	out:
05dbc7b5 ED	139	sk = NULL;
05dbc7b5 ED	140	found:
3ab5aee7	141	rcu_read_unlock();
b1a7ffcb DV	142	return sk;
	143	}
	144	EXPORT_SYMBOL(__inet6_lookup_established);
	145
42b16b3f	146	static inline int compute_score(struct sock sk, struct net net,
c25eb3bf ED	147	const unsigned short hnum,
	148	const struct in6_addr *daddr,
	149	const int dif)
	150	{
	151	int score = -1;
	152
c720c7e8	153	if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum &&
c25eb3bf	154	sk->sk_family == PF_INET6) {
c25eb3bf ED	155
c25eb3bf ED	156	score = 1;
efe4208f ED	157	if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
efe4208f ED	158	if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
c25eb3bf ED	159	return -1;
	160	score++;
	161	}
	162	if (sk->sk_bound_dev_if) {
	163	if (sk->sk_bound_dev_if != dif)
	164	return -1;
	165	score++;
	166	}
	167	}
	168	return score;
	169	}
	170
d86e0dac	171	struct sock inet6_lookup_listener(struct net net,
5ba24953 TH	172	struct inet_hashinfo hashinfo, const struct in6_addr saddr,
5ba24953 TH	173	const __be16 sport, const struct in6_addr *daddr,
d86e0dac	174	const unsigned short hnum, const int dif)
5324a040 ACM	175	{
5324a040 ACM	176	struct sock *sk;
c25eb3bf ED	177	const struct hlist_nulls_node *node;
c25eb3bf ED	178	struct sock *result;
5ba24953 TH	179	int score, hiscore, matches = 0, reuseport = 0;
5ba24953 TH	180	u32 phash = 0;
c25eb3bf ED	181	unsigned int hash = inet_lhashfn(net, hnum);
	182	struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
	183
	184	rcu_read_lock();
	185	begin:
	186	result = NULL;
5ba24953	187	hiscore = 0;
c25eb3bf ED	188	sk_nulls_for_each(sk, node, &ilb->head) {
	189	score = compute_score(sk, net, hnum, daddr, dif);
	190	if (score > hiscore) {
	191	hiscore = score;
	192	result = sk;
5ba24953 TH	193	reuseport = sk->sk_reuseport;
	194	if (reuseport) {
	195	phash = inet6_ehashfn(net, daddr, hnum,
	196	saddr, sport);
	197	matches = 1;
	198	}
	199	} else if (score == hiscore && reuseport) {
	200	matches++;
	201	if (((u64)phash * matches) >> 32 == 0)
	202	result = sk;
	203	phash = next_pseudo_random32(phash);
5324a040 ACM	204	}
5324a040 ACM	205	}
c25eb3bf ED	206	/*
	207	* if the nulls value we got at the end of this lookup is
	208	* not the expected one, we must restart lookup.
	209	* We probably met an item that was moved to another chain.
	210	*/
	211	if (get_nulls_value(node) != hash + LISTENING_NULLS_BASE)
	212	goto begin;
	213	if (result) {
	214	if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
	215	result = NULL;
	216	else if (unlikely(compute_score(result, net, hnum, daddr,
	217	dif) < hiscore)) {
	218	sock_put(result);
	219	goto begin;
	220	}
	221	}
	222	rcu_read_unlock();
5324a040 ACM	223	return result;
	224	}
	225
	226	EXPORT_SYMBOL_GPL(inet6_lookup_listener);
	227
d86e0dac	228	struct sock inet6_lookup(struct net net, struct inet_hashinfo *hashinfo,
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;
	234
	235	local_bh_disable();
d86e0dac	236	sk = __inet6_lookup(net, hashinfo, saddr, sport, daddr, ntohs(dport), dif);
5324a040 ACM	237	local_bh_enable();
	238
	239	return sk;
	240	}
	241
	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;
c720c7e8	253	const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
33de014c PE	254	struct net *net = sock_net(sk);
33de014c PE	255	const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr,
c720c7e8	256	inet->inet_dport);
d8313f5c	257	struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
9db66bdc	258	spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
d8313f5c	259	struct sock *sk2;
3ab5aee7	260	const struct hlist_nulls_node *node;
05dbc7b5	261	struct inet_timewait_sock *tw = NULL;
13475a30	262	int twrefcnt = 0;
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
efe4208f ED	270	if (likely(INET6_MATCH(sk2, net, saddr, daddr, ports, dif))) {
efe4208f ED	271	if (sk2->sk_state == TCP_TIME_WAIT) {
05dbc7b5 ED	272	tw = inet_twsk(sk2);
05dbc7b5 ED	273	if (twsk_unique(sk, sk2, twp))
efe4208f	274	break;
05dbc7b5	275	}
d8313f5c	276	goto not_unique;
efe4208f	277	}
d8313f5c ACM	278	}
d8313f5c ACM	279
3759fa9c	280	/* Must record num and sport now. Otherwise we will see
efe4208f ED	281	* in hash table socket with a funny identity.
efe4208f ED	282	*/
c720c7e8 ED	283	inet->inet_num = lport;
c720c7e8 ED	284	inet->inet_sport = htons(lport);
13475a30	285	sk->sk_hash = hash;
547b792c	286	WARN_ON(!sk_unhashed(sk));
3ab5aee7	287	__sk_nulls_add_node_rcu(sk, &head->chain);
13475a30 ED	288	if (tw) {
	289	twrefcnt = inet_twsk_unhash(tw);
	290	NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED);
	291	}
9db66bdc	292	spin_unlock(lock);
13475a30 ED	293	if (twrefcnt)
13475a30 ED	294	inet_twsk_put(tw);
c29a0bc4	295	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
d8313f5c	296
13475a30	297	if (twp) {
d8313f5c	298	*twp = tw;
13475a30	299	} else if (tw) {
d8313f5c ACM	300	/* Silly. Should hash-dance instead... */
d8313f5c ACM	301	inet_twsk_deschedule(tw, death_row);
d8313f5c ACM	302
	303	inet_twsk_put(tw);
	304	}
	305	return 0;
	306
	307	not_unique:
9db66bdc	308	spin_unlock(lock);
d8313f5c ACM	309	return -EADDRNOTAVAIL;
	310	}
	311
	312	static inline u32 inet6_sk_port_offset(const struct sock *sk)
	313	{
	314	const struct inet_sock *inet = inet_sk(sk);
efe4208f ED	315
	316	return secure_ipv6_port_ephemeral(sk->sk_v6_rcv_saddr.s6_addr32,
	317	sk->sk_v6_daddr.s6_addr32,
c720c7e8	318	inet->inet_dport);
d8313f5c ACM	319	}
	320
	321	int inet6_hash_connect(struct inet_timewait_death_row *death_row,
	322	struct sock *sk)
	323	{
5d8c0aa9	324	return __inet_hash_connect(death_row, sk, inet6_sk_port_offset(sk),
5ee31fc1	325	__inet6_check_established, __inet6_hash);
d8313f5c ACM	326	}
	327
	328	EXPORT_SYMBOL_GPL(inet6_hash_connect);