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Arnaldo Carvalho de Melo505cbfc2005-08-12 09:19:38 -03001/*
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 * Authors: Lotsa people, from code originally in tcp
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14#ifndef _INET6_HASHTABLES_H
15#define _INET6_HASHTABLES_H
16
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030017
18#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
19#include <linux/in6.h>
20#include <linux/ipv6.h>
Arnaldo Carvalho de Melo505cbfc2005-08-12 09:19:38 -030021#include <linux/types.h>
David S. Millerb3da2cf2007-03-23 11:40:27 -070022#include <linux/jhash.h>
23
24#include <net/inet_sock.h>
Arnaldo Carvalho de Melo505cbfc2005-08-12 09:19:38 -030025
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030026#include <net/ipv6.h>
Pavel Emelyanov0b441912008-06-16 17:14:11 -070027#include <net/netns/hash.h>
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030028
Arnaldo Carvalho de Melo505cbfc2005-08-12 09:19:38 -030029struct inet_hashinfo;
30
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030031/* I have no idea if this is a good hash for v6 or not. -DaveM */
Pavel Emelyanov33de0142008-06-16 17:13:48 -070032static inline unsigned int inet6_ehashfn(struct net *net,
33 const struct in6_addr *laddr, const u16 lport,
Al Virod2ecd9c2006-11-08 00:20:00 -080034 const struct in6_addr *faddr, const __be16 fport)
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030035{
David S. Millerb3da2cf2007-03-23 11:40:27 -070036 u32 ports = (lport ^ (__force u16)fport);
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030037
David S. Millerb3da2cf2007-03-23 11:40:27 -070038 return jhash_3words((__force u32)laddr->s6_addr32[3],
39 (__force u32)faddr->s6_addr32[3],
Pavel Emelyanov0b441912008-06-16 17:14:11 -070040 ports, inet_ehash_secret + net_hash_mix(net));
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030041}
42
Eric Dumazet81c3d542005-10-03 14:13:38 -070043static inline int inet6_sk_ehashfn(const struct sock *sk)
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030044{
45 const struct inet_sock *inet = inet_sk(sk);
46 const struct ipv6_pinfo *np = inet6_sk(sk);
47 const struct in6_addr *laddr = &np->rcv_saddr;
48 const struct in6_addr *faddr = &np->daddr;
49 const __u16 lport = inet->num;
Al Virod2ecd9c2006-11-08 00:20:00 -080050 const __be16 fport = inet->dport;
Pavel Emelyanov33de0142008-06-16 17:13:48 -070051 struct net *net = sock_net(sk);
52
53 return inet6_ehashfn(net, laddr, lport, faddr, fport);
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030054}
55
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -080056extern void __inet6_hash(struct sock *sk);
Arnaldo Carvalho de Melo90b19d32005-12-13 23:15:01 -080057
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030058/*
59 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
60 * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
61 *
62 * The sockhash lock must be held as a reader here.
63 */
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -080064extern struct sock *__inet6_lookup_established(struct net *net,
65 struct inet_hashinfo *hashinfo,
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030066 const struct in6_addr *saddr,
Al Virod2ecd9c2006-11-08 00:20:00 -080067 const __be16 sport,
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030068 const struct in6_addr *daddr,
69 const u16 hnum,
Denis Vlasenkob1a7ffc2006-04-09 22:48:59 -070070 const int dif);
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030071
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -080072extern struct sock *inet6_lookup_listener(struct net *net,
73 struct inet_hashinfo *hashinfo,
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030074 const struct in6_addr *daddr,
75 const unsigned short hnum,
76 const int dif);
77
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -080078static inline struct sock *__inet6_lookup(struct net *net,
79 struct inet_hashinfo *hashinfo,
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030080 const struct in6_addr *saddr,
Al Virod2ecd9c2006-11-08 00:20:00 -080081 const __be16 sport,
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030082 const struct in6_addr *daddr,
83 const u16 hnum,
84 const int dif)
85{
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -080086 struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr,
87 sport, daddr, hnum, dif);
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030088 if (sk)
89 return sk;
90
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -080091 return inet6_lookup_listener(net, hashinfo, daddr, hnum, dif);
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030092}
93
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -070094static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
95 struct sk_buff *skb,
96 const __be16 sport,
97 const __be16 dport)
98{
KOVACS Krisztian23542612008-10-07 12:41:01 -070099 struct sock *sk;
100
101 if (unlikely(sk = skb_steal_sock(skb)))
102 return sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000103 else return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo,
KOVACS Krisztian23542612008-10-07 12:41:01 -0700104 &ipv6_hdr(skb)->saddr, sport,
105 &ipv6_hdr(skb)->daddr, ntohs(dport),
106 inet6_iif(skb));
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700107}
108
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -0800109extern struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
Al Virod2ecd9c2006-11-08 00:20:00 -0800110 const struct in6_addr *saddr, const __be16 sport,
111 const struct in6_addr *daddr, const __be16 dport,
Arnaldo Carvalho de Melo505cbfc2005-08-12 09:19:38 -0300112 const int dif);
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -0300113#endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */
Arnaldo Carvalho de Melo505cbfc2005-08-12 09:19:38 -0300114#endif /* _INET6_HASHTABLES_H */