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 #include <net/netns/hash.h> 28 29 struct inet_hashinfo; 30 31 /* I have no idea if this is a good hash for v6 or not. -DaveM */ 32 static inline unsigned int inet6_ehashfn(struct net *net, 33 const struct in6_addr *laddr, const u16 lport, 34 const struct in6_addr *faddr, const __be16 fport) 35 { 36 u32 ports = (lport ^ (__force u16)fport); 37 38 return jhash_3words((__force u32)laddr->s6_addr32[3], 39 (__force u32)faddr->s6_addr32[3], 40 ports, inet_ehash_secret + net_hash_mix(net)); 41 } 42 43 static inline int inet6_sk_ehashfn(const struct sock *sk) 44 { 45 const struct inet_sock *inet = inet_sk(sk); 46 const struct ipv6_pinfo *np = inet6_sk(sk); 47 const struct in6_addr *laddr = &np->rcv_saddr; 48 const struct in6_addr *faddr = &np->daddr; 49 const __u16 lport = inet->inet_num; 50 const __be16 fport = inet->inet_dport; 51 struct net *net = sock_net(sk); 52 53 return inet6_ehashfn(net, laddr, lport, faddr, fport); 54 } 55 56 extern int __inet6_hash(struct sock *sk, struct inet_timewait_sock *twp); 57 58 /* 59 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so 60 * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM 61 * 62 * The sockhash lock must be held as a reader here. 63 */ 64 extern struct sock *__inet6_lookup_established(struct net *net, 65 struct inet_hashinfo *hashinfo, 66 const struct in6_addr *saddr, 67 const __be16 sport, 68 const struct in6_addr *daddr, 69 const u16 hnum, 70 const int dif); 71 72 extern struct sock *inet6_lookup_listener(struct net *net, 73 struct inet_hashinfo *hashinfo, 74 const struct in6_addr *daddr, 75 const unsigned short hnum, 76 const int dif); 77 78 static inline struct sock *__inet6_lookup(struct net *net, 79 struct inet_hashinfo *hashinfo, 80 const struct in6_addr *saddr, 81 const __be16 sport, 82 const struct in6_addr *daddr, 83 const u16 hnum, 84 const int dif) 85 { 86 struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr, 87 sport, daddr, hnum, dif); 88 if (sk) 89 return sk; 90 91 return inet6_lookup_listener(net, hashinfo, daddr, hnum, dif); 92 } 93 94 static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo, 95 struct sk_buff *skb, 96 const __be16 sport, 97 const __be16 dport) 98 { 99 struct sock *sk; 100 101 if (unlikely(sk = skb_steal_sock(skb))) 102 return sk; 103 else return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo, 104 &ipv6_hdr(skb)->saddr, sport, 105 &ipv6_hdr(skb)->daddr, ntohs(dport), 106 inet6_iif(skb)); 107 } 108 109 extern struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo, 110 const struct in6_addr *saddr, const __be16 sport, 111 const struct in6_addr *daddr, const __be16 dport, 112 const int dif); 113 #endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */ 114 #endif /* _INET6_HASHTABLES_H */ 115