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 IS_ENABLED(CONFIG_IPV6)
  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 static inline unsigned int inet6_ehashfn(struct net *net,
  32                                 const struct in6_addr *laddr, const u16 lport,
  33                                 const struct in6_addr *faddr, const __be16 fport)
  34 {
  35         u32 ports = (((u32)lport) << 16) | (__force u32)fport;
  36
  37         return jhash_3words((__force u32)laddr->s6_addr32[3],
  38                             ipv6_addr_jhash(faddr),
  39                             ports,
  40                             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 in6_addr *laddr = &sk->sk_v6_rcv_saddr;
  47         const struct in6_addr *faddr = &sk->sk_v6_daddr;
  48         const __u16 lport = inet->inet_num;
  49         const __be16 fport = inet->inet_dport;
  50         struct net *net = sock_net(sk);
  51
  52         return inet6_ehashfn(net, laddr, lport, faddr, fport);
  53 }
  54
  55 int __inet6_hash(struct sock *sk, struct inet_timewait_sock *twp);
  56
  57 /*
  58  * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
  59  * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
  60  *
  61  * The sockhash lock must be held as a reader here.
  62  */
  63 struct sock *__inet6_lookup_established(struct net *net,
  64                                         struct inet_hashinfo *hashinfo,
  65                                         const struct in6_addr *saddr,
  66                                         const __be16 sport,
  67                                         const struct in6_addr *daddr,
  68                                         const u16 hnum, const int dif);
  69
  70 struct sock *inet6_lookup_listener(struct net *net,
  71                                    struct inet_hashinfo *hashinfo,
  72                                    const struct in6_addr *saddr,
  73                                    const __be16 sport,
  74                                    const struct in6_addr *daddr,
  75                                    const unsigned short hnum, const int dif);
  76
  77 static inline struct sock *__inet6_lookup(struct net *net,
  78                                           struct inet_hashinfo *hashinfo,
  79                                           const struct in6_addr *saddr,
  80                                           const __be16 sport,
  81                                           const struct in6_addr *daddr,
  82                                           const u16 hnum,
  83                                           const int dif)
  84 {
  85         struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr,
  86                                                 sport, daddr, hnum, dif);
  87         if (sk)
  88                 return sk;
  89
  90         return inet6_lookup_listener(net, hashinfo, saddr, sport,
  91                                      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 = skb_steal_sock(skb);
 100
 101         if (sk)
 102                 return sk;
 103
 104         return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo,
 105                               &ipv6_hdr(skb)->saddr, sport,
 106                               &ipv6_hdr(skb)->daddr, ntohs(dport),
 107                               inet6_iif(skb));
 108 }
 109
 110 struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
 111                           const struct in6_addr *saddr, const __be16 sport,
 112                           const struct in6_addr *daddr, const __be16 dport,
 113                           const int dif);
 114 #endif /* IS_ENABLED(CONFIG_IPV6) */
 115 #endif /* _INET6_HASHTABLES_H */