Release 4.8 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));
}

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hannes frederic sowa
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eric dumazet
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109
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3
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/*
 * 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;
}
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eric dumazet
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denys vlasenko
denys vlasenko
98
44.95%
1
9.09%
pavel emelianov
pavel emelianov
7
3.21%
2
18.18%
al viro
al viro
2
0.92%
2
18.18%
Total
218
100.00%
11
100.00%


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++;
		}
		if (sk->sk_incoming_cpu == raw_smp_processor_id())
			score++;
	}
	return score;
}

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eric dumazet
eric dumazet
42
29.58%
5
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pavel emelianov
pavel emelianov
7
4.93%
1
10.00%
hideaki yoshifuji
hideaki yoshifuji
7
4.93%
2
20.00%
jesper juhl
jesper juhl
1
0.70%
1
10.00%
Total
142
100.00%
10
100.00%

/* 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;
	struct sock *sk, *result = NULL;
	u32 phash = 0;

	sk_for_each(sk, &ilb->head) {
		score = compute_score(sk, net, hnum, daddr, 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;
}
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eric dumazet
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tom herbert
68
29.18%
1
12.50%
craig gallek
craig gallek
24
10.30%
2
25.00%
arnaldo carvalho de melo
arnaldo carvalho de melo
19
8.15%
1
12.50%
daniel borkmann
daniel borkmann
4
1.72%
1
12.50%
Total
233
100.00%
8
100.00%


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;
}
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eric dumazet
eric dumazet
26
23.85%
1
20.00%
craig gallek
craig gallek
12
11.01%
1
20.00%
pavel emelianov
pavel emelianov
7
6.42%
1
20.00%
al viro
al viro
2
1.83%
1
20.00%
Total
109
100.00%
5
100.00%


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;
}

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26.54%
12
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pavel emelianov
26
7.26%
5
22.73%
herbert xu
herbert xu
13
3.63%
1
4.55%
ilpo jarvinen
ilpo jarvinen
2
0.56%
1
4.55%
al viro
al viro
1
0.28%
1
4.55%
hideaki yoshifuji
hideaki yoshifuji
1
0.28%
1
4.55%
Total
358
100.00%
22
100.00%



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);
}

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11.63%
2
66.67%
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43
100.00%
3
100.00%



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);
}
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1
25.00%
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pavel emelianov
2
4.08%
2
50.00%
Total
49
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(inet6_hash_connect);



int inet6_hash(struct sock *sk)
{
	if (sk->sk_state != TCP_CLOSE) {
		local_bh_disable();
		__inet_hash(sk, NULL, ipv6_rcv_saddr_equal);
		local_bh_enable();
	}

	return 0;
}
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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;
}
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EXPORT_SYMBOL_GPL(ipv6_rcv_saddr_equal);
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eric dumazet
423
27.31%
20
42.55%
craig gallek
craig gallek
280
18.08%
3
6.38%
hannes frederic sowa
hannes frederic sowa
107
6.91%
2
4.26%
denys vlasenko
denys vlasenko
104
6.71%
1
2.13%
tom herbert
tom herbert
68
4.39%
1
2.13%
pavel emelianov
pavel emelianov
49
3.16%
7
14.89%
herbert xu
herbert xu
13
0.84%
1
2.13%
hideaki yoshifuji
hideaki yoshifuji
8
0.52%
3
6.38%
al viro
al viro
5
0.32%
2
4.26%
daniel borkmann
daniel borkmann
4
0.26%
1
2.13%
david s. miller
david s. miller
3
0.19%
1
2.13%
ilpo jarvinen
ilpo jarvinen
2
0.13%
1
2.13%
jesper juhl
jesper juhl
1
0.06%
1
2.13%
ian morris
ian morris
1
0.06%
1
2.13%
Total
1549
100.00%
47
100.00%
  
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