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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 | ||
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 inet_hashinfo *hashinfo, 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 inet_hashinfo *hashinfo, | |
61 | const struct in6_addr *saddr, | |
62 | const __be16 sport, | |
63 | const struct in6_addr *daddr, | |
64 | const u16 hnum, | |
65 | const int dif); | |
66 | ||
67 | extern struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo, | |
68 | const struct in6_addr *daddr, | |
69 | const unsigned short hnum, | |
70 | const int dif); | |
71 | ||
72 | static inline struct sock *__inet6_lookup(struct inet_hashinfo *hashinfo, | |
73 | const struct in6_addr *saddr, | |
74 | const __be16 sport, | |
75 | const struct in6_addr *daddr, | |
76 | const u16 hnum, | |
77 | const int dif) | |
78 | { | |
79 | struct sock *sk = __inet6_lookup_established(hashinfo, saddr, sport, | |
80 | daddr, hnum, dif); | |
81 | if (sk) | |
82 | return sk; | |
83 | ||
84 | return inet6_lookup_listener(hashinfo, daddr, hnum, dif); | |
85 | } | |
86 | ||
87 | extern struct sock *inet6_lookup(struct inet_hashinfo *hashinfo, | |
88 | const struct in6_addr *saddr, const __be16 sport, | |
89 | const struct in6_addr *daddr, const __be16 dport, | |
90 | const int dif); | |
91 | #endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */ | |
92 | #endif /* _INET6_HASHTABLES_H */ |