[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 <[email protected]>
 *
 *	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)
{
	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))
			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:
	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, 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) {
			if (sk->sk_bound_dev_if != dif)
				return -1;
			score++;
		}
		if (sk->sk_incoming_cpu == raw_smp_processor_id())
			score++;
	}
	return score;
}

/* called with rcu_read_lock() */
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)
{
	unsigned int hash = inet_lhashfn(net, hnum);
	struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
	int score, hiscore = 0, matches = 0, reuseport = 0;
	bool exact_dif = inet6_exact_dif_match(net, skb);
	struct sock *sk, *result = NULL;
	u32 phash = 0;

	sk_for_each(sk, &ilb->head) {
		score = compute_score(sk, net, hnum, daddr, dif, exact_dif);
		if (score > hiscore) {
			reuseport = sk->sk_reuseport;
			if (reuseport) {
				phash = inet6_ehashfn(net, daddr, hnum,
						      saddr, sport);
				result = reuseport_select_sock(sk, phash,
							       skb, doff);
				if (result)
					return result;
				matches = 1;
			}
			result = sk;
			hiscore = score;
		} else if (score == hiscore && reuseport) {
			matches++;
			if (reciprocal_scale(phash, matches) == 0)
				result = sk;
			phash = next_pseudo_random32(phash);
		}
	}
	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, &refcounted);
	if (sk && !refcounted && !atomic_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;
	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;

	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) {
		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, ipv6_rcv_saddr_equal);
		local_bh_enable();
	}

	return err;
}
EXPORT_SYMBOL_GPL(inet6_hash);

/* match_wildcard == true:  IPV6_ADDR_ANY equals to any IPv6 addresses if IPv6
 *                          only, and any IPv4 addresses if not IPv6 only
 * match_wildcard == false: addresses must be exactly the same, i.e.
 *                          IPV6_ADDR_ANY only equals to IPV6_ADDR_ANY,
 *                          and 0.0.0.0 equals to 0.0.0.0 only
 */
int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
			 bool match_wildcard)
{
	const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
	int sk2_ipv6only = inet_v6_ipv6only(sk2);
	int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
	int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;

	/* if both are mapped, treat as IPv4 */
	if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) {
		if (!sk2_ipv6only) {
			if (sk->sk_rcv_saddr == sk2->sk_rcv_saddr)
				return 1;
			if (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr)
				return match_wildcard;
		}
		return 0;
	}

	if (addr_type == IPV6_ADDR_ANY && addr_type2 == IPV6_ADDR_ANY)
		return 1;

	if (addr_type2 == IPV6_ADDR_ANY && match_wildcard &&
	    !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
		return 1;

	if (addr_type == IPV6_ADDR_ANY && match_wildcard &&
	    !(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED))
		return 1;

	if (sk2_rcv_saddr6 &&
	    ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6))
		return 1;

	return 0;
}
EXPORT_SYMBOL_GPL(ipv6_rcv_saddr_equal);
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 <[email protected]>
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,
	58	const u16 hnum,
	59	const int dif)
	60	{
	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;
efe4208f ED	76	if (!INET6_MATCH(sk, net, saddr, daddr, ports, dif))
efe4208f ED	77	continue;
05dbc7b5 ED	78	if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt)))
	79	goto out;
	80
efe4208f ED	81	if (unlikely(!INET6_MATCH(sk, net, saddr, daddr, ports, dif))) {
	82	sock_gen_put(sk);
	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,
a04a480d	99	const int dif, 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) {
c25eb3bf ED	113	if (sk->sk_bound_dev_if != dif)
	114	return -1;
	115	score++;
	116	}
70da268b ED	117	if (sk->sk_incoming_cpu == raw_smp_processor_id())
70da268b ED	118	score++;
c25eb3bf ED	119	}
	120	return score;
	121	}
	122
3b24d854	123	/* called with rcu_read_lock() */
d86e0dac	124	struct sock inet6_lookup_listener(struct net net,
a583636a CG	125	struct inet_hashinfo *hashinfo,
	126	struct sk_buff *skb, int doff,
	127	const struct in6_addr *saddr,
5ba24953	128	const __be16 sport, const struct in6_addr *daddr,
d86e0dac	129	const unsigned short hnum, const int dif)
5324a040	130	{
c25eb3bf ED	131	unsigned int hash = inet_lhashfn(net, hnum);
c25eb3bf ED	132	struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
3b24d854	133	int score, hiscore = 0, matches = 0, reuseport = 0;
a04a480d	134	bool exact_dif = inet6_exact_dif_match(net, skb);
3b24d854 ED	135	struct sock sk, result = NULL;
3b24d854 ED	136	u32 phash = 0;
c25eb3bf	137
3b24d854	138	sk_for_each(sk, &ilb->head) {
a04a480d	139	score = compute_score(sk, net, hnum, daddr, dif, exact_dif);
c25eb3bf	140	if (score > hiscore) {
03c5b534	141	reuseport = sk->sk_reuseport;
5ba24953 TH	142	if (reuseport) {
	143	phash = inet6_ehashfn(net, daddr, hnum,
	144	saddr, sport);
3b24d854 ED	145	result = reuseport_select_sock(sk, phash,
	146	skb, doff);
	147	if (result)
	148	return result;
5ba24953 TH	149	matches = 1;
5ba24953 TH	150	}
3b24d854	151	result = sk;
03c5b534	152	hiscore = score;
5ba24953 TH	153	} else if (score == hiscore && reuseport) {
5ba24953 TH	154	matches++;
8fc54f68	155	if (reciprocal_scale(phash, matches) == 0)
5ba24953 TH	156	result = sk;
5ba24953 TH	157	phash = next_pseudo_random32(phash);
5324a040 ACM	158	}
5324a040 ACM	159	}
5324a040 ACM	160	return result;
5324a040 ACM	161	}
5324a040 ACM	162	EXPORT_SYMBOL_GPL(inet6_lookup_listener);
5324a040 ACM	163
d86e0dac	164	struct sock inet6_lookup(struct net net, struct inet_hashinfo *hashinfo,
a583636a	165	struct sk_buff *skb, int doff,
d2ecd9cc AV	166	const struct in6_addr *saddr, const __be16 sport,
d2ecd9cc AV	167	const struct in6_addr *daddr, const __be16 dport,
5324a040 ACM	168	const int dif)
	169	{
	170	struct sock *sk;
3b24d854	171	bool refcounted;
5324a040	172
a583636a	173	sk = __inet6_lookup(net, hashinfo, skb, doff, saddr, sport, daddr,
3b24d854 ED	174	ntohs(dport), dif, &refcounted);
	175	if (sk && !refcounted && !atomic_inc_not_zero(&sk->sk_refcnt))
	176	sk = NULL;
5324a040 ACM	177	return sk;
5324a040 ACM	178	}
5324a040	179	EXPORT_SYMBOL_GPL(inet6_lookup);
d8313f5c ACM	180
	181	static int __inet6_check_established(struct inet_timewait_death_row *death_row,
	182	struct sock *sk, const __u16 lport,
	183	struct inet_timewait_sock **twp)
	184	{
	185	struct inet_hashinfo *hinfo = death_row->hashinfo;
3759fa9c	186	struct inet_sock *inet = inet_sk(sk);
efe4208f ED	187	const struct in6_addr *daddr = &sk->sk_v6_rcv_saddr;
efe4208f ED	188	const struct in6_addr *saddr = &sk->sk_v6_daddr;
d8313f5c	189	const int dif = sk->sk_bound_dev_if;
c720c7e8	190	const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
33de014c PE	191	struct net *net = sock_net(sk);
33de014c PE	192	const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr,
c720c7e8	193	inet->inet_dport);
d8313f5c	194	struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
9db66bdc	195	spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
d8313f5c	196	struct sock *sk2;
3ab5aee7	197	const struct hlist_nulls_node *node;
05dbc7b5	198	struct inet_timewait_sock *tw = NULL;
d8313f5c	199
9db66bdc	200	spin_lock(lock);
d8313f5c	201
05dbc7b5	202	sk_nulls_for_each(sk2, node, &head->chain) {
ce43b03e ED	203	if (sk2->sk_hash != hash)
ce43b03e ED	204	continue;
d8313f5c	205
efe4208f ED	206	if (likely(INET6_MATCH(sk2, net, saddr, daddr, ports, dif))) {
efe4208f ED	207	if (sk2->sk_state == TCP_TIME_WAIT) {
05dbc7b5 ED	208	tw = inet_twsk(sk2);
05dbc7b5 ED	209	if (twsk_unique(sk, sk2, twp))
efe4208f	210	break;
05dbc7b5	211	}
d8313f5c	212	goto not_unique;
efe4208f	213	}
d8313f5c ACM	214	}
d8313f5c ACM	215
3759fa9c	216	/* Must record num and sport now. Otherwise we will see
efe4208f ED	217	* in hash table socket with a funny identity.
efe4208f ED	218	*/
c720c7e8 ED	219	inet->inet_num = lport;
c720c7e8 ED	220	inet->inet_sport = htons(lport);
13475a30	221	sk->sk_hash = hash;
547b792c	222	WARN_ON(!sk_unhashed(sk));
3ab5aee7	223	__sk_nulls_add_node_rcu(sk, &head->chain);
13475a30	224	if (tw) {
fc01538f	225	sk_nulls_del_node_init_rcu((struct sock *)tw);
02a1d6e7	226	__NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
13475a30	227	}
9db66bdc	228	spin_unlock(lock);
c29a0bc4	229	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
d8313f5c	230
13475a30	231	if (twp) {
d8313f5c	232	*twp = tw;
13475a30	233	} else if (tw) {
d8313f5c	234	/* Silly. Should hash-dance instead... */
dbe7faa4	235	inet_twsk_deschedule_put(tw);
d8313f5c ACM	236	}
	237	return 0;
	238
	239	not_unique:
9db66bdc	240	spin_unlock(lock);
d8313f5c ACM	241	return -EADDRNOTAVAIL;
	242	}
	243
e2baad9e	244	static u32 inet6_sk_port_offset(const struct sock *sk)
d8313f5c ACM	245	{
d8313f5c ACM	246	const struct inet_sock *inet = inet_sk(sk);
efe4208f ED	247
	248	return secure_ipv6_port_ephemeral(sk->sk_v6_rcv_saddr.s6_addr32,
	249	sk->sk_v6_daddr.s6_addr32,
c720c7e8	250	inet->inet_dport);
d8313f5c ACM	251	}
	252
	253	int inet6_hash_connect(struct inet_timewait_death_row *death_row,
	254	struct sock *sk)
	255	{
e2baad9e ED	256	u32 port_offset = 0;
	257
	258	if (!inet_sk(sk)->inet_num)
	259	port_offset = inet6_sk_port_offset(sk);
	260	return __inet_hash_connect(death_row, sk, port_offset,
b4d6444e	261	__inet6_check_established);
d8313f5c	262	}
d8313f5c	263	EXPORT_SYMBOL_GPL(inet6_hash_connect);
496611d7 CG	264
	265	int inet6_hash(struct sock *sk)
	266	{
e4cabca5 CG	267	int err = 0;
e4cabca5 CG	268
496611d7 CG	269	if (sk->sk_state != TCP_CLOSE) {
496611d7 CG	270	local_bh_disable();
e4cabca5	271	err = __inet_hash(sk, NULL, ipv6_rcv_saddr_equal);
496611d7 CG	272	local_bh_enable();
	273	}
	274
e4cabca5	275	return err;
496611d7 CG	276	}
	277	EXPORT_SYMBOL_GPL(inet6_hash);
	278
	279	/* match_wildcard == true: IPV6_ADDR_ANY equals to any IPv6 addresses if IPv6
	280	* only, and any IPv4 addresses if not IPv6 only
	281	* match_wildcard == false: addresses must be exactly the same, i.e.
	282	* IPV6_ADDR_ANY only equals to IPV6_ADDR_ANY,
	283	* and 0.0.0.0 equals to 0.0.0.0 only
	284	*/
	285	int ipv6_rcv_saddr_equal(const struct sock sk, const struct sock sk2,
	286	bool match_wildcard)
	287	{
	288	const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
	289	int sk2_ipv6only = inet_v6_ipv6only(sk2);
	290	int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
	291	int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
	292
	293	/* if both are mapped, treat as IPv4 */
	294	if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) {
	295	if (!sk2_ipv6only) {
	296	if (sk->sk_rcv_saddr == sk2->sk_rcv_saddr)
	297	return 1;
	298	if (!sk->sk_rcv_saddr \|\| !sk2->sk_rcv_saddr)
	299	return match_wildcard;
	300	}
	301	return 0;
	302	}
	303
	304	if (addr_type == IPV6_ADDR_ANY && addr_type2 == IPV6_ADDR_ANY)
	305	return 1;
	306
	307	if (addr_type2 == IPV6_ADDR_ANY && match_wildcard &&
	308	!(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
	309	return 1;
	310
	311	if (addr_type == IPV6_ADDR_ANY && match_wildcard &&
	312	!(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED))
	313	return 1;
	314
	315	if (sk2_rcv_saddr6 &&
	316	ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6))
	317	return 1;
	318
	319	return 0;
	320	}
	321	EXPORT_SYMBOL_GPL(ipv6_rcv_saddr_equal);