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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
Eric Dumazetdfd56b82011-12-10 09:48:31 +000018#if IS_ENABLED(CONFIG_IPV6)
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030019#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
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020031static inline unsigned int __inet6_ehashfn(const u32 lhash,
32 const u16 lport,
33 const u32 fhash,
34 const __be16 fport,
35 const u32 initval)
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030036{
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020037 const u32 ports = (((u32)lport) << 16) | (__force u32)fport;
38 return jhash_3words(lhash, fhash, ports, initval);
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030039}
40
41/*
42 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
43 * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
44 *
45 * The sockhash lock must be held as a reader here.
46 */
Joe Perches1fd51152013-09-21 10:22:41 -070047struct sock *__inet6_lookup_established(struct net *net,
48 struct inet_hashinfo *hashinfo,
49 const struct in6_addr *saddr,
50 const __be16 sport,
51 const struct in6_addr *daddr,
52 const u16 hnum, const int dif);
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030053
Joe Perches1fd51152013-09-21 10:22:41 -070054struct sock *inet6_lookup_listener(struct net *net,
55 struct inet_hashinfo *hashinfo,
Craig Galleka5836362016-02-10 11:50:38 -050056 struct sk_buff *skb, int doff,
Joe Perches1fd51152013-09-21 10:22:41 -070057 const struct in6_addr *saddr,
58 const __be16 sport,
59 const struct in6_addr *daddr,
60 const unsigned short hnum, const int dif);
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030061
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -080062static inline struct sock *__inet6_lookup(struct net *net,
63 struct inet_hashinfo *hashinfo,
Craig Galleka5836362016-02-10 11:50:38 -050064 struct sk_buff *skb, int doff,
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030065 const struct in6_addr *saddr,
Al Virod2ecd9c2006-11-08 00:20:00 -080066 const __be16 sport,
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030067 const struct in6_addr *daddr,
68 const u16 hnum,
69 const int dif)
70{
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -080071 struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr,
72 sport, daddr, hnum, dif);
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030073 if (sk)
74 return sk;
75
Craig Galleka5836362016-02-10 11:50:38 -050076 return inet6_lookup_listener(net, hashinfo, skb, doff, saddr, sport,
Tom Herbert5ba24952013-01-22 09:50:39 +000077 daddr, hnum, dif);
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030078}
79
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -070080static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
Craig Galleka5836362016-02-10 11:50:38 -050081 struct sk_buff *skb, int doff,
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -070082 const __be16 sport,
Eric Dumazet870c3152014-10-17 09:17:20 -070083 const __be16 dport,
84 int iif)
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -070085{
Eric Dumazetc7109982012-07-26 12:18:11 +000086 struct sock *sk = skb_steal_sock(skb);
KOVACS Krisztian23542612008-10-07 12:41:01 -070087
Eric Dumazetc7109982012-07-26 12:18:11 +000088 if (sk)
KOVACS Krisztian23542612008-10-07 12:41:01 -070089 return sk;
Eric Dumazetc7109982012-07-26 12:18:11 +000090
Craig Galleka5836362016-02-10 11:50:38 -050091 return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
92 doff, &ipv6_hdr(skb)->saddr, sport,
Eric Dumazetc7109982012-07-26 12:18:11 +000093 &ipv6_hdr(skb)->daddr, ntohs(dport),
Eric Dumazet870c3152014-10-17 09:17:20 -070094 iif);
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -070095}
96
Joe Perches1fd51152013-09-21 10:22:41 -070097struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
Craig Galleka5836362016-02-10 11:50:38 -050098 struct sk_buff *skb, int doff,
Joe Perches1fd51152013-09-21 10:22:41 -070099 const struct in6_addr *saddr, const __be16 sport,
100 const struct in6_addr *daddr, const __be16 dport,
101 const int dif);
Craig Gallek496611d2016-02-10 11:50:36 -0500102
103int inet6_hash(struct sock *sk);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000104#endif /* IS_ENABLED(CONFIG_IPV6) */
WANG Cong25de4662014-11-04 10:59:47 -0800105
106#define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \
107 (((__sk)->sk_portpair == (__ports)) && \
108 ((__sk)->sk_family == AF_INET6) && \
109 ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr)) && \
110 ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr)) && \
111 (!(__sk)->sk_bound_dev_if || \
112 ((__sk)->sk_bound_dev_if == (__dif))) && \
113 net_eq(sock_net(__sk), (__net)))
114
Arnaldo Carvalho de Melo505cbfc2005-08-12 09:19:38 -0300115#endif /* _INET6_HASHTABLES_H */