/* * 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 __be16 fport) { unsigned int hashent = (lport ^ (__force u16)fport); hashent ^= (__force u32)(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 __be16 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 __be16 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 __be16 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 __be16 sport, const struct in6_addr *daddr, const __be16 dport, const int dif); #endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */ #endif /* _INET6_HASHTABLES_H */