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 25 struct inet_hashinfo; 26 27 /* I have no idea if this is a good hash for v6 or not. -DaveM */ 28 static inline unsigned int inet6_ehashfn(const struct in6_addr *laddr, const u16 lport, 29 const struct in6_addr *faddr, const __be16 fport) 30 { 31 unsigned int hashent = (lport ^ (__force u16)fport); 32 33 hashent ^= (__force u32)(laddr->s6_addr32[3] ^ faddr->s6_addr32[3]); 34 hashent ^= hashent >> 16; 35 hashent ^= hashent >> 8; 36 return hashent; 37 } 38 39 static 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 __be16 fport = inet->dport; 47 return inet6_ehashfn(laddr, lport, faddr, fport); 48 } 49 50 extern 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 */ 58 extern struct sock *__inet6_lookup_established(struct inet_hashinfo *hashinfo, 59 const struct in6_addr *saddr, 60 const __be16 sport, 61 const struct in6_addr *daddr, 62 const u16 hnum, 63 const int dif); 64 65 extern 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 70 static inline struct sock *__inet6_lookup(struct inet_hashinfo *hashinfo, 71 const struct in6_addr *saddr, 72 const __be16 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 85 extern struct sock *inet6_lookup(struct inet_hashinfo *hashinfo, 86 const struct in6_addr *saddr, const __be16 sport, 87 const struct in6_addr *daddr, const __be16 dport, 88 const int dif); 89 #endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */ 90 #endif /* _INET6_HASHTABLES_H */ 91