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inet_hashtables: Add inet_lookup_skb helpers
[mirror_ubuntu-zesty-kernel.git] / include / net / inet6_hashtables.h
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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 * 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
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17
18#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
19#include <linux/in6.h>
20#include <linux/ipv6.h>
505cbfc5 21#include <linux/types.h>
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22#include <linux/jhash.h>
23
24#include <net/inet_sock.h>
505cbfc5 25
5324a040 26#include <net/ipv6.h>
0b441916 27#include <net/netns/hash.h>
5324a040 28
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29struct inet_hashinfo;
30
5324a040 31/* I have no idea if this is a good hash for v6 or not. -DaveM */
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32static inline unsigned int inet6_ehashfn(struct net *net,
33 const struct in6_addr *laddr, const u16 lport,
d2ecd9cc 34 const struct in6_addr *faddr, const __be16 fport)
5324a040 35{
b3da2cf3 36 u32 ports = (lport ^ (__force u16)fport);
5324a040 37
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38 return jhash_3words((__force u32)laddr->s6_addr32[3],
39 (__force u32)faddr->s6_addr32[3],
0b441916 40 ports, inet_ehash_secret + net_hash_mix(net));
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41}
42
81c3d547 43static inline int inet6_sk_ehashfn(const struct sock *sk)
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44{
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;
d2ecd9cc 50 const __be16 fport = inet->dport;
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51 struct net *net = sock_net(sk);
52
53 return inet6_ehashfn(net, laddr, lport, faddr, fport);
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54}
55
ab1e0a13 56extern void __inet6_hash(struct sock *sk);
90b19d31 57
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58/*
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 */
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64extern struct sock *__inet6_lookup_established(struct net *net,
65 struct inet_hashinfo *hashinfo,
5324a040 66 const struct in6_addr *saddr,
d2ecd9cc 67 const __be16 sport,
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68 const struct in6_addr *daddr,
69 const u16 hnum,
b1a7ffcb 70 const int dif);
5324a040 71
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72extern struct sock *inet6_lookup_listener(struct net *net,
73 struct inet_hashinfo *hashinfo,
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74 const struct in6_addr *daddr,
75 const unsigned short hnum,
76 const int dif);
77
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78static inline struct sock *__inet6_lookup(struct net *net,
79 struct inet_hashinfo *hashinfo,
5324a040 80 const struct in6_addr *saddr,
d2ecd9cc 81 const __be16 sport,
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82 const struct in6_addr *daddr,
83 const u16 hnum,
84 const int dif)
85{
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86 struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr,
87 sport, daddr, hnum, dif);
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88 if (sk)
89 return sk;
90
d86e0dac 91 return inet6_lookup_listener(net, hashinfo, daddr, hnum, dif);
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92}
93
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94static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
95 struct sk_buff *skb,
96 const __be16 sport,
97 const __be16 dport)
98{
99 return __inet6_lookup(dev_net(skb->dst->dev), hashinfo,
100 &ipv6_hdr(skb)->saddr, sport,
101 &ipv6_hdr(skb)->daddr, ntohs(dport),
102 inet6_iif(skb));
103}
104
d86e0dac 105extern struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
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106 const struct in6_addr *saddr, const __be16 sport,
107 const struct in6_addr *daddr, const __be16 dport,
505cbfc5 108 const int dif);
5324a040 109#endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */
505cbfc5 110#endif /* _INET6_HASHTABLES_H */