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(const u32 lhash,
  32                                     const u16 lport,
  33                                     const u32 fhash,
  34                                     const __be16 fport,
  35                                     const u32 initval)
  36 {
  37         const u32 ports = (((u32)lport) << 16) | (__force u32)fport;
  38         return jhash_3words(lhash, fhash, ports, initval);
  39 }
  40
  41 /*
  42  * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
  43  * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
  44  *
  45  * The sockhash lock must be held as a reader here.
  46  */
  47 struct sock *__inet6_lookup_established(struct net *net,
  48                                         struct inet_hashinfo *hashinfo,
  49                                         const struct in6_addr *saddr,
  50                                         const __be16 sport,
  51                                         const struct in6_addr *daddr,
  52                                         const u16 hnum, const int dif);
  53
  54 struct sock *inet6_lookup_listener(struct net *net,
  55                                    struct inet_hashinfo *hashinfo,
  56                                    struct sk_buff *skb, int doff,
  57                                    const struct in6_addr *saddr,
  58                                    const __be16 sport,
  59                                    const struct in6_addr *daddr,
  60                                    const unsigned short hnum, const int dif);
  61
  62 static inline struct sock *__inet6_lookup(struct net *net,
  63                                           struct inet_hashinfo *hashinfo,
  64                                           struct sk_buff *skb, int doff,
  65                                           const struct in6_addr *saddr,
  66                                           const __be16 sport,
  67                                           const struct in6_addr *daddr,
  68                                           const u16 hnum,
  69                                           const int dif,
  70                                           bool *refcounted)
  71 {
  72         struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr,
  73                                                 sport, daddr, hnum, dif);
  74         *refcounted = true;
  75         if (sk)
  76                 return sk;
  77         *refcounted = false;
  78         return inet6_lookup_listener(net, hashinfo, skb, doff, saddr, sport,
  79                                      daddr, hnum, dif);
  80 }
  81
  82 static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
  83                                               struct sk_buff *skb, int doff,
  84                                               const __be16 sport,
  85                                               const __be16 dport,
  86                                               int iif,
  87                                               bool *refcounted)
  88 {
  89         struct sock *sk = skb_steal_sock(skb);
  90
  91         *refcounted = true;
  92         if (sk)
  93                 return sk;
  94
  95         return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
  96                               doff, &ipv6_hdr(skb)->saddr, sport,
  97                               &ipv6_hdr(skb)->daddr, ntohs(dport),
  98                               iif, refcounted);
  99 }
 100
 101 struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
 102                           struct sk_buff *skb, int doff,
 103                           const struct in6_addr *saddr, const __be16 sport,
 104                           const struct in6_addr *daddr, const __be16 dport,
 105                           const int dif);
 106
 107 int inet6_hash(struct sock *sk);
 108 #endif /* IS_ENABLED(CONFIG_IPV6) */
 109
 110 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 111         (((__sk)->sk_portpair == (__ports))                     &&      \
 112          ((__sk)->sk_family == AF_INET6)                        &&      \
 113          ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr))               &&      \
 114          ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr))   &&      \
 115          (!(__sk)->sk_bound_dev_if      ||                              \
 116            ((__sk)->sk_bound_dev_if == (__dif)))                &&      \
 117          net_eq(sock_net(__sk), (__net)))
 118
 119 #endif /* _INET6_HASHTABLES_H */