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