linux/include/net/inet6_hashtables.h
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   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
  29struct inet_hashinfo;
  30
  31/* I have no idea if this is a good hash for v6 or not. -DaveM */
  32static 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
  43static 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->num;
  50        const __be16 fport = inet->dport;
  51        struct net *net = sock_net(sk);
  52
  53        return inet6_ehashfn(net, laddr, lport, faddr, fport);
  54}
  55
  56extern void __inet6_hash(struct sock *sk);
  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 */
  64extern 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
  72extern 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
  78static 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
  94static 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->dev), hashinfo,
 104                                   &ipv6_hdr(skb)->saddr, sport,
 105                                   &ipv6_hdr(skb)->daddr, ntohs(dport),
 106                                   inet6_iif(skb));
 107}
 108
 109extern 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