/* * INET		An implementation of the TCP/IP protocol suite for the LINUX *		operating system.  INET is implemented using the BSD Socket *		interface as the means of communication with the user level. * * Authors:	Lotsa people, from code originally in tcp * *	This program is free software; you can redistribute it and/or *      modify it under the terms of the GNU General Public License *      as published by the Free Software Foundation; either version *      2 of the License, or (at your option) any later version. */ #ifndef _INET6_HASHTABLES_H#define _INET6_HASHTABLES_H  #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)#include <linux/in6.h>#include <linux/ipv6.h>#include <linux/types.h> #include <net/ipv6.h> struct inet_hashinfo; /* I have no idea if this is a good hash for v6 or not. -DaveM */static inline unsigned int inet6_ehashfn(const struct in6_addr *laddr, const u16 lport,				const struct in6_addr *faddr, const u16 fport){	unsigned int hashent = (lport ^ fport); 	hashent ^= (laddr->s6_addr32[3] ^ faddr->s6_addr32[3]);	hashent ^= hashent >> 16;	hashent ^= hashent >> 8;	return hashent;} static inline int inet6_sk_ehashfn(const struct sock *sk){	const struct inet_sock *inet = inet_sk(sk);	const struct ipv6_pinfo *np = inet6_sk(sk);	const struct in6_addr *laddr = &np->rcv_saddr;	const struct in6_addr *faddr = &np->daddr;	const __u16 lport = inet->num;	const __u16 fport = inet->dport;	return inet6_ehashfn(laddr, lport, faddr, fport);} extern void __inet6_hash(struct inet_hashinfo *hashinfo, struct sock *sk); /* * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM * * The sockhash lock must be held as a reader here. */extern struct sock *__inet6_lookup_established(struct inet_hashinfo *hashinfo,					   const struct in6_addr *saddr,					   const u16 sport,					   const struct in6_addr *daddr,					   const u16 hnum,					   const int dif); extern struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo,					  const struct in6_addr *daddr,					  const unsigned short hnum,					  const int dif); static inline struct sock *__inet6_lookup(struct inet_hashinfo *hashinfo,					  const struct in6_addr *saddr,					  const u16 sport,					  const struct in6_addr *daddr,					  const u16 hnum,					  const int dif){	struct sock *sk = __inet6_lookup_established(hashinfo, saddr, sport,						     daddr, hnum, dif);	if (sk)		return sk; 	return inet6_lookup_listener(hashinfo, daddr, hnum, dif);} extern struct sock *inet6_lookup(struct inet_hashinfo *hashinfo,				 const struct in6_addr *saddr, const u16 sport,				 const struct in6_addr *daddr, const u16 dport,				 const int dif);#endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */#endif /* _INET6_HASHTABLES_H */