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
17
18 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
19 #include <linux/in6.h>
20 #include <linux/ipv6.h>
21 #include <linux/types.h>
22 #include <linux/jhash.h>
23
24 #include <net/inet_sock.h>
25
26 #include <net/ipv6.h>
27
28 struct inet_hashinfo;
29
30 /* I have no idea if this is a good hash for v6 or not. -DaveM */
31 static inline unsigned int inet6_ehashfn(const struct in6_addr *laddr, const u16 lport,
32 const struct in6_addr *faddr, const __be16 fport)
33 {
34 u32 ports = (lport ^ (__force u16)fport);
35
36 return jhash_3words((__force u32)laddr->s6_addr32[3],
37 (__force u32)faddr->s6_addr32[3],
38 ports, inet_ehash_secret);
39 }
40
41 static inline int inet6_sk_ehashfn(const struct sock *sk)
42 {
43 const struct inet_sock *inet = inet_sk(sk);
44 const struct ipv6_pinfo *np = inet6_sk(sk);
45 const struct in6_addr *laddr = &np->rcv_saddr;
46 const struct in6_addr *faddr = &np->daddr;
47 const __u16 lport = inet->num;
48 const __be16 fport = inet->dport;
49 return inet6_ehashfn(laddr, lport, faddr, fport);
50 }
51
52 extern void __inet6_hash(struct sock *sk);
53
54 /*
55 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
56 * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
57 *
58 * The sockhash lock must be held as a reader here.
59 */
60 extern struct sock *__inet6_lookup_established(struct net *net,
61 struct inet_hashinfo *hashinfo,
62 const struct in6_addr *saddr,
63 const __be16 sport,
64 const struct in6_addr *daddr,
65 const u16 hnum,
66 const int dif);
67
68 extern struct sock *inet6_lookup_listener(struct net *net,
69 struct inet_hashinfo *hashinfo,
70 const struct in6_addr *daddr,
71 const unsigned short hnum,
72 const int dif);
73
74 static inline struct sock *__inet6_lookup(struct net *net,
75 struct inet_hashinfo *hashinfo,
76 const struct in6_addr *saddr,
77 const __be16 sport,
78 const struct in6_addr *daddr,
79 const u16 hnum,
80 const int dif)
81 {
82 struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr,
83 sport, daddr, hnum, dif);
84 if (sk)
85 return sk;
86
87 return inet6_lookup_listener(net, hashinfo, daddr, hnum, dif);
88 }
89
90 extern struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
91 const struct in6_addr *saddr, const __be16 sport,
92 const struct in6_addr *daddr, const __be16 dport,
93 const int dif);
94 #endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */
95 #endif /* _INET6_HASHTABLES_H */
96
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