include/net/inet6_hashtables.h

   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 inet_hashinfo *hashinfo, 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 inet_hashinfo *hashinfo,
  61                                            const struct in6_addr *saddr,
  62                                            const __be16 sport,
  63                                            const struct in6_addr *daddr,
  64                                            const u16 hnum,
  65                                            const int dif);
  66
  67 extern struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo,
  68                                           const struct in6_addr *daddr,
  69                                           const unsigned short hnum,
  70                                           const int dif);
  71
  72 static inline struct sock *__inet6_lookup(struct inet_hashinfo *hashinfo,
  73                                           const struct in6_addr *saddr,
  74                                           const __be16 sport,
  75                                           const struct in6_addr *daddr,
  76                                           const u16 hnum,
  77                                           const int dif)
  78 {
  79         struct sock *sk = __inet6_lookup_established(hashinfo, saddr, sport,
  80                                                      daddr, hnum, dif);
  81         if (sk)
  82                 return sk;
  83
  84         return inet6_lookup_listener(hashinfo, daddr, hnum, dif);
  85 }
  86
  87 extern struct sock *inet6_lookup(struct inet_hashinfo *hashinfo,
  88                                  const struct in6_addr *saddr, const __be16 sport,
  89                                  const struct in6_addr *daddr, const __be16 dport,
  90                                  const int dif);
  91 #endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */
  92 #endif /* _INET6_HASHTABLES_H */