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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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>
 */

#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(net, sk, saddr, daddr, ports, dif, sdif))
			continue;
		if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
			goto out;

		if (unlikely(!inet6_match(net, sk, 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)
{
	int score = -1;

	if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum &&
	    sk->sk_family == PF_INET6) {
		if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
			return -1;

		if (!inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
			return -1;

		score =  sk->sk_bound_dev_if ? 2 : 1;
		if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
			score++;
	}
	return score;
}

static inline struct sock *lookup_reuseport(struct net *net, struct sock *sk,
					    struct sk_buff *skb, int doff,
					    const struct in6_addr *saddr,
					    __be16 sport,
					    const struct in6_addr *daddr,
					    unsigned short hnum)
{
	struct sock *reuse_sk = NULL;
	u32 phash;

	if (sk->sk_reuseport) {
		phash = inet6_ehashfn(net, daddr, hnum, saddr, sport);
		reuse_sk = reuseport_select_sock(sk, phash, skb, doff);
	}
	return reuse_sk;
}

/* 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)
{
	struct sock *sk, *result = NULL;
	struct hlist_nulls_node *node;
	int score, hiscore = 0;

	sk_nulls_for_each_rcu(sk, node, &ilb2->nulls_head) {
		score = compute_score(sk, net, hnum, daddr, dif, sdif);
		if (score > hiscore) {
			result = lookup_reuseport(net, sk, skb, doff,
						  saddr, sport, daddr, hnum);
			if (result)
				return result;

			result = sk;
			hiscore = score;
		}
	}

	return result;
}

static inline struct sock *inet6_lookup_run_bpf(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 u16 hnum, const int dif)
{
	struct sock *sk, *reuse_sk;
	bool no_reuseport;

	if (hashinfo != net->ipv4.tcp_death_row.hashinfo)
		return NULL; /* only TCP is supported */

	no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_TCP, saddr, sport,
					    daddr, hnum, dif, &sk);
	if (no_reuseport || IS_ERR_OR_NULL(sk))
		return sk;

	reuse_sk = lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
	if (reuse_sk)
		sk = reuse_sk;
	return sk;
}

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)
{
	struct inet_listen_hashbucket *ilb2;
	struct sock *result = NULL;
	unsigned int hash2;

	/* Lookup redirect from BPF */
	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
		result = inet6_lookup_run_bpf(net, hashinfo, skb, doff,
					      saddr, sport, daddr, hnum, dif);
		if (result)
			goto done;
	}

	hash2 = ipv6_portaddr_hash(net, daddr, hnum);
	ilb2 = inet_lhash2_bucket(hashinfo, hash2);

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

	/* Lookup lhash2 with in6addr_any */
	hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
	ilb2 = inet_lhash2_bucket(hashinfo, hash2);

	result = inet6_lhash2_lookup(net, ilb2, skb, doff,
				     saddr, sport, &in6addr_any, hnum,
				     dif, sdif);
done:
	if (IS_ERR(result))
		return NULL;
	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(net, sk2, 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 u64 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)
{
	u64 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)
		err = __inet_hash(sk, NULL);

	return err;
}
EXPORT_SYMBOL_GPL(inet6_hash);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
5324a040 ACM	2	/*
	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.
	6	*
	7	* Generic INET6 transport hashtables
	8	*
d8313f5c	9	* Authors: Lotsa people, from code originally in tcp, generalised here
67ba4152	10	* by Arnaldo Carvalho de Melo <acme@mandriva.com>
5324a040 ACM	11	*/
5324a040 ACM	12
5324a040	13	#include <linux/module.h>
d8313f5c	14	#include <linux/random.h>
5324a040	15
c125e80b	16	#include <net/addrconf.h>
5324a040 ACM	17	#include <net/inet_connection_sock.h>
	18	#include <net/inet_hashtables.h>
	19	#include <net/inet6_hashtables.h>
6e5714ea	20	#include <net/secure_seq.h>
d8313f5c	21	#include <net/ip.h>
c125e80b	22	#include <net/sock_reuseport.h>
5324a040	23
d1e559d0 ED	24	u32 inet6_ehashfn(const struct net *net,
	25	const struct in6_addr *laddr, const u16 lport,
	26	const struct in6_addr *faddr, const __be16 fport)
b50026b5	27	{
1bbdceef HFS	28	static u32 inet6_ehash_secret __read_mostly;
	29	static u32 ipv6_hash_secret __read_mostly;
	30
	31	u32 lhash, fhash;
	32
	33	net_get_random_once(&inet6_ehash_secret, sizeof(inet6_ehash_secret));
	34	net_get_random_once(&ipv6_hash_secret, sizeof(ipv6_hash_secret));
	35
	36	lhash = (__force u32)laddr->s6_addr32[3];
	37	fhash = __ipv6_addr_jhash(faddr, ipv6_hash_secret);
	38
b50026b5	39	return __inet6_ehashfn(lhash, lport, fhash, fport,
1bbdceef	40	inet6_ehash_secret + net_hash_mix(net));
b50026b5 HFS	41	}
b50026b5 HFS	42
b1a7ffcb DV	43	/*
	44	* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
	45	* we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
	46	*
	47	* The sockhash lock must be held as a reader here.
	48	*/
d86e0dac PE	49	struct sock __inet6_lookup_established(struct net net,
d86e0dac PE	50	struct inet_hashinfo *hashinfo,
b1a7ffcb	51	const struct in6_addr *saddr,
d2ecd9cc	52	const __be16 sport,
b1a7ffcb DV	53	const struct in6_addr *daddr,
b1a7ffcb DV	54	const u16 hnum,
4297a0ef	55	const int dif, const int sdif)
b1a7ffcb DV	56	{
b1a7ffcb DV	57	struct sock *sk;
3ab5aee7	58	const struct hlist_nulls_node *node;
4f765d84	59	const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
b1a7ffcb DV	60	/* Optimize here for direct hit, only listening connections can
	61	* have wildcards anyways.
	62	*/
33de014c	63	unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport);
f373b53b	64	unsigned int slot = hash & hashinfo->ehash_mask;
3ab5aee7	65	struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
b1a7ffcb	66
3ab5aee7	67
3ab5aee7 ED	68	begin:
3ab5aee7 ED	69	sk_nulls_for_each_rcu(sk, node, &head->chain) {
ce43b03e ED	70	if (sk->sk_hash != hash)
ce43b03e ED	71	continue;
5d368f03	72	if (!inet6_match(net, sk, saddr, daddr, ports, dif, sdif))
efe4208f	73	continue;
41c6d650	74	if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
05dbc7b5 ED	75	goto out;
05dbc7b5 ED	76
5d368f03	77	if (unlikely(!inet6_match(net, sk, saddr, daddr, ports, dif, sdif))) {
efe4208f ED	78	sock_gen_put(sk);
efe4208f ED	79	goto begin;
3ab5aee7	80	}
efe4208f	81	goto found;
b1a7ffcb	82	}
3ab5aee7 ED	83	if (get_nulls_value(node) != slot)
3ab5aee7 ED	84	goto begin;
3ab5aee7	85	out:
05dbc7b5 ED	86	sk = NULL;
05dbc7b5 ED	87	found:
b1a7ffcb DV	88	return sk;
	89	}
	90	EXPORT_SYMBOL(__inet6_lookup_established);
	91
42b16b3f	92	static inline int compute_score(struct sock sk, struct net net,
c25eb3bf ED	93	const unsigned short hnum,
c25eb3bf ED	94	const struct in6_addr *daddr,
3f7d820b	95	const int dif, const int sdif)
c25eb3bf ED	96	{
	97	int score = -1;
	98
c720c7e8	99	if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum &&
c25eb3bf	100	sk->sk_family == PF_INET6) {
0ee58dad PO	101	if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
0ee58dad PO	102	return -1;
c25eb3bf	103
0ee58dad	104	if (!inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
e7819058	105	return -1;
4297a0ef	106
8d6c414c	107	score = sk->sk_bound_dev_if ? 2 : 1;
7170a977	108	if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
70da268b	109	score++;
c25eb3bf ED	110	}
	111	return score;
	112	}
	113
5df65312 JS	114	static inline struct sock lookup_reuseport(struct net net, struct sock *sk,
	115	struct sk_buff *skb, int doff,
	116	const struct in6_addr *saddr,
	117	__be16 sport,
	118	const struct in6_addr *daddr,
	119	unsigned short hnum)
	120	{
	121	struct sock *reuse_sk = NULL;
	122	u32 phash;
	123
	124	if (sk->sk_reuseport) {
	125	phash = inet6_ehashfn(net, daddr, hnum, saddr, sport);
	126	reuse_sk = reuseport_select_sock(sk, phash, skb, doff);
	127	}
	128	return reuse_sk;
	129	}
	130
3b24d854	131	/* called with rcu_read_lock() */
61b7c691 MKL	132	static struct sock inet6_lhash2_lookup(struct net net,
	133	struct inet_listen_hashbucket *ilb2,
	134	struct sk_buff *skb, int doff,
	135	const struct in6_addr *saddr,
	136	const __be16 sport, const struct in6_addr *daddr,
	137	const unsigned short hnum, const int dif, const int sdif)
	138	{
61b7c691	139	struct sock sk, result = NULL;
cae3873c	140	struct hlist_nulls_node *node;
61b7c691	141	int score, hiscore = 0;
61b7c691	142
cae3873c	143	sk_nulls_for_each_rcu(sk, node, &ilb2->nulls_head) {
3f7d820b	144	score = compute_score(sk, net, hnum, daddr, dif, sdif);
61b7c691	145	if (score > hiscore) {
5df65312 JS	146	result = lookup_reuseport(net, sk, skb, doff,
	147	saddr, sport, daddr, hnum);
	148	if (result)
	149	return result;
	150
61b7c691 MKL	151	result = sk;
	152	hiscore = score;
	153	}
	154	}
	155
	156	return result;
	157	}
	158
1122702f JS	159	static inline struct sock inet6_lookup_run_bpf(struct net net,
	160	struct inet_hashinfo *hashinfo,
	161	struct sk_buff *skb, int doff,
	162	const struct in6_addr *saddr,
	163	const __be16 sport,
	164	const struct in6_addr *daddr,
f8931565	165	const u16 hnum, const int dif)
1122702f JS	166	{
	167	struct sock sk, reuse_sk;
	168	bool no_reuseport;
	169
4461568a	170	if (hashinfo != net->ipv4.tcp_death_row.hashinfo)
1122702f JS	171	return NULL; /* only TCP is supported */
1122702f JS	172
f8931565 MP	173	no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_TCP, saddr, sport,
f8931565 MP	174	daddr, hnum, dif, &sk);
1122702f JS	175	if (no_reuseport \|\| IS_ERR_OR_NULL(sk))
	176	return sk;
	177
	178	reuse_sk = lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
	179	if (reuse_sk)
	180	sk = reuse_sk;
	181	return sk;
	182	}
	183
d86e0dac	184	struct sock inet6_lookup_listener(struct net net,
a583636a CG	185	struct inet_hashinfo *hashinfo,
	186	struct sk_buff *skb, int doff,
	187	const struct in6_addr *saddr,
5ba24953	188	const __be16 sport, const struct in6_addr *daddr,
4297a0ef	189	const unsigned short hnum, const int dif, const int sdif)
5324a040	190	{
61b7c691	191	struct inet_listen_hashbucket *ilb2;
0ee58dad	192	struct sock *result = NULL;
61b7c691	193	unsigned int hash2;
61b7c691	194
1122702f JS	195	/* Lookup redirect from BPF */
	196	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
	197	result = inet6_lookup_run_bpf(net, hashinfo, skb, doff,
f8931565	198	saddr, sport, daddr, hnum, dif);
1122702f JS	199	if (result)
	200	goto done;
	201	}
	202
61b7c691 MKL	203	hash2 = ipv6_portaddr_hash(net, daddr, hnum);
61b7c691 MKL	204	ilb2 = inet_lhash2_bucket(hashinfo, hash2);
61b7c691 MKL	205
	206	result = inet6_lhash2_lookup(net, ilb2, skb, doff,
	207	saddr, sport, daddr, hnum,
	208	dif, sdif);
	209	if (result)
8217ca65	210	goto done;
61b7c691 MKL	211
61b7c691 MKL	212	/* Lookup lhash2 with in6addr_any */
61b7c691 MKL	213	hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
61b7c691 MKL	214	ilb2 = inet_lhash2_bucket(hashinfo, hash2);
61b7c691	215
8217ca65	216	result = inet6_lhash2_lookup(net, ilb2, skb, doff,
0ee58dad	217	saddr, sport, &in6addr_any, hnum,
8217ca65	218	dif, sdif);
8217ca65	219	done:
26f8113c	220	if (IS_ERR(result))
8217ca65	221	return NULL;
5324a040 ACM	222	return result;
5324a040 ACM	223	}
5324a040 ACM	224	EXPORT_SYMBOL_GPL(inet6_lookup_listener);
5324a040 ACM	225
d86e0dac	226	struct sock inet6_lookup(struct net net, struct inet_hashinfo *hashinfo,
a583636a	227	struct sk_buff *skb, int doff,
d2ecd9cc AV	228	const struct in6_addr *saddr, const __be16 sport,
d2ecd9cc AV	229	const struct in6_addr *daddr, const __be16 dport,
5324a040 ACM	230	const int dif)
	231	{
	232	struct sock *sk;
3b24d854	233	bool refcounted;
5324a040	234
a583636a	235	sk = __inet6_lookup(net, hashinfo, skb, doff, saddr, sport, daddr,
4297a0ef	236	ntohs(dport), dif, 0, &refcounted);
41c6d650	237	if (sk && !refcounted && !refcount_inc_not_zero(&sk->sk_refcnt))
3b24d854	238	sk = NULL;
5324a040 ACM	239	return sk;
5324a040 ACM	240	}
5324a040	241	EXPORT_SYMBOL_GPL(inet6_lookup);
d8313f5c ACM	242
	243	static int __inet6_check_established(struct inet_timewait_death_row *death_row,
	244	struct sock *sk, const __u16 lport,
	245	struct inet_timewait_sock **twp)
	246	{
	247	struct inet_hashinfo *hinfo = death_row->hashinfo;
3759fa9c	248	struct inet_sock *inet = inet_sk(sk);
efe4208f ED	249	const struct in6_addr *daddr = &sk->sk_v6_rcv_saddr;
efe4208f ED	250	const struct in6_addr *saddr = &sk->sk_v6_daddr;
d8313f5c	251	const int dif = sk->sk_bound_dev_if;
33de014c	252	struct net *net = sock_net(sk);
4297a0ef DA	253	const int sdif = l3mdev_master_ifindex_by_index(net, dif);
4297a0ef DA	254	const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
33de014c	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;
d8313f5c	262
9db66bdc	263	spin_lock(lock);
d8313f5c	264
05dbc7b5	265	sk_nulls_for_each(sk2, node, &head->chain) {
ce43b03e ED	266	if (sk2->sk_hash != hash)
ce43b03e ED	267	continue;
d8313f5c	268
5d368f03	269	if (likely(inet6_match(net, sk2, saddr, daddr, ports,
4297a0ef	270	dif, sdif))) {
efe4208f	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	288	if (tw) {
fc01538f	289	sk_nulls_del_node_init_rcu((struct sock *)tw);
02a1d6e7	290	__NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
13475a30	291	}
9db66bdc	292	spin_unlock(lock);
c29a0bc4	293	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
d8313f5c	294
13475a30	295	if (twp) {
d8313f5c	296	*twp = tw;
13475a30	297	} else if (tw) {
d8313f5c	298	/* Silly. Should hash-dance instead... */
dbe7faa4	299	inet_twsk_deschedule_put(tw);
d8313f5c ACM	300	}
	301	return 0;
	302
	303	not_unique:
9db66bdc	304	spin_unlock(lock);
d8313f5c ACM	305	return -EADDRNOTAVAIL;
	306	}
	307
b2d05756	308	static u64 inet6_sk_port_offset(const struct sock *sk)
d8313f5c ACM	309	{
d8313f5c ACM	310	const struct inet_sock *inet = inet_sk(sk);
efe4208f ED	311
	312	return secure_ipv6_port_ephemeral(sk->sk_v6_rcv_saddr.s6_addr32,
	313	sk->sk_v6_daddr.s6_addr32,
c720c7e8	314	inet->inet_dport);
d8313f5c ACM	315	}
	316
	317	int inet6_hash_connect(struct inet_timewait_death_row *death_row,
	318	struct sock *sk)
	319	{
b2d05756	320	u64 port_offset = 0;
e2baad9e ED	321
	322	if (!inet_sk(sk)->inet_num)
	323	port_offset = inet6_sk_port_offset(sk);
	324	return __inet_hash_connect(death_row, sk, port_offset,
b4d6444e	325	__inet6_check_established);
d8313f5c	326	}
d8313f5c	327	EXPORT_SYMBOL_GPL(inet6_hash_connect);
496611d7 CG	328
	329	int inet6_hash(struct sock *sk)
	330	{
e4cabca5 CG	331	int err = 0;
e4cabca5 CG	332
4f9bf2a2	333	if (sk->sk_state != TCP_CLOSE)
fe38d2a1	334	err = __inet_hash(sk, NULL);
496611d7	335
e4cabca5	336	return err;
496611d7 CG	337	}
496611d7 CG	338	EXPORT_SYMBOL_GPL(inet6_hash);