tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
23#include <net/ipv6.h>
24
25struct inet_hashinfo;
26
27/* I have no idea if this is a good hash for v6 or not. -DaveM */
28static inline unsigned int inet6_ehashfn(const struct in6_addr *laddr, const u16 lport,
29 const struct in6_addr *faddr, const u16 fport)
30{
31 unsigned int hashent = (lport ^ fport);
32
33 hashent ^= (laddr->s6_addr32[3] ^ faddr->s6_addr32[3]);
34 hashent ^= hashent >> 16;
35 hashent ^= hashent >> 8;
36 return hashent;
37}
38
39static inline int inet6_sk_ehashfn(const struct sock *sk)
40{
41 const struct inet_sock *inet = inet_sk(sk);
42 const struct ipv6_pinfo *np = inet6_sk(sk);
43 const struct in6_addr *laddr = &np->rcv_saddr;
44 const struct in6_addr *faddr = &np->daddr;
45 const __u16 lport = inet->num;
46 const __u16 fport = inet->dport;
47 return inet6_ehashfn(laddr, lport, faddr, fport);
48}
49
50extern void __inet6_hash(struct inet_hashinfo *hashinfo, struct sock *sk);
51
52/*
53 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
54 * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
55 *
56 * The sockhash lock must be held as a reader here.
57 */
58extern struct sock *__inet6_lookup_established(struct inet_hashinfo *hashinfo,
59 const struct in6_addr *saddr,
60 const u16 sport,
61 const struct in6_addr *daddr,
62 const u16 hnum,
63 const int dif);
64
65extern struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo,
66 const struct in6_addr *daddr,
67 const unsigned short hnum,
68 const int dif);
69
70static inline struct sock *__inet6_lookup(struct inet_hashinfo *hashinfo,
71 const struct in6_addr *saddr,
72 const u16 sport,
73 const struct in6_addr *daddr,
74 const u16 hnum,
75 const int dif)
76{
77 struct sock *sk = __inet6_lookup_established(hashinfo, saddr, sport,
78 daddr, hnum, dif);
79 if (sk)
80 return sk;
81
82 return inet6_lookup_listener(hashinfo, daddr, hnum, dif);
83}
84
85extern struct sock *inet6_lookup(struct inet_hashinfo *hashinfo,
86 const struct in6_addr *saddr, const u16 sport,
87 const struct in6_addr *daddr, const u16 dport,
88 const int dif);
89#endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */
90#endif /* _INET6_HASHTABLES_H */