include/net/inet6_hashtables.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   4  *              operating system.  INET is implemented using the BSD Socket
   5  *              interface as the means of communication with the user level.
   6  *
   7  * Authors:     Lotsa people, from code originally in tcp
   8  */
   9
  10 #ifndef _INET6_HASHTABLES_H
  11 #define _INET6_HASHTABLES_H
  12
  13
  14 #if IS_ENABLED(CONFIG_IPV6)
  15 #include <linux/in6.h>
  16 #include <linux/ipv6.h>
  17 #include <linux/types.h>
  18 #include <linux/jhash.h>
  19
  20 #include <net/inet_sock.h>
  21
  22 #include <net/ipv6.h>
  23 #include <net/netns/hash.h>
  24
  25 struct inet_hashinfo;
  26
  27 static inline unsigned int __inet6_ehashfn(const u32 lhash,
  28                                     const u16 lport,
  29                                     const u32 fhash,
  30                                     const __be16 fport,
  31                                     const u32 initval)
  32 {
  33         const u32 ports = (((u32)lport) << 16) | (__force u32)fport;
  34         return jhash_3words(lhash, fhash, ports, initval);
  35 }
  36
  37 /*
  38  * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
  39  * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
  40  *
  41  * The sockhash lock must be held as a reader here.
  42  */
  43 struct sock *__inet6_lookup_established(struct net *net,
  44                                         struct inet_hashinfo *hashinfo,
  45                                         const struct in6_addr *saddr,
  46                                         const __be16 sport,
  47                                         const struct in6_addr *daddr,
  48                                         const u16 hnum, const int dif,
  49                                         const int sdif);
  50
  51 struct sock *inet6_lookup_listener(struct net *net,
  52                                    struct inet_hashinfo *hashinfo,
  53                                    struct sk_buff *skb, int doff,
  54                                    const struct in6_addr *saddr,
  55                                    const __be16 sport,
  56                                    const struct in6_addr *daddr,
  57                                    const unsigned short hnum,
  58                                    const int dif, const int sdif);
  59
  60 static inline struct sock *__inet6_lookup(struct net *net,
  61                                           struct inet_hashinfo *hashinfo,
  62                                           struct sk_buff *skb, int doff,
  63                                           const struct in6_addr *saddr,
  64                                           const __be16 sport,
  65                                           const struct in6_addr *daddr,
  66                                           const u16 hnum,
  67                                           const int dif, const int sdif,
  68                                           bool *refcounted)
  69 {
  70         struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr,
  71                                                      sport, daddr, hnum,
  72                                                      dif, sdif);
  73         *refcounted = true;
  74         if (sk)
  75                 return sk;
  76         *refcounted = false;
  77         return inet6_lookup_listener(net, hashinfo, skb, doff, saddr, sport,
  78                                      daddr, hnum, dif, sdif);
  79 }
  80
  81 static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
  82                                               struct sk_buff *skb, int doff,
  83                                               const __be16 sport,
  84                                               const __be16 dport,
  85                                               int iif, int sdif,
  86                                               bool *refcounted)
  87 {
  88         struct sock *sk = skb_steal_sock(skb);
  89
  90         *refcounted = true;
  91         if (sk)
  92                 return sk;
  93
  94         return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
  95                               doff, &ipv6_hdr(skb)->saddr, sport,
  96                               &ipv6_hdr(skb)->daddr, ntohs(dport),
  97                               iif, sdif, refcounted);
  98 }
  99
 100 struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
 101                           struct sk_buff *skb, int doff,
 102                           const struct in6_addr *saddr, const __be16 sport,
 103                           const struct in6_addr *daddr, const __be16 dport,
 104                           const int dif);
 105
 106 int inet6_hash(struct sock *sk);
 107 #endif /* IS_ENABLED(CONFIG_IPV6) */
 108
 109 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif, __sdif) \
 110         (((__sk)->sk_portpair == (__ports))                     &&      \
 111          ((__sk)->sk_family == AF_INET6)                        &&      \
 112          ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr))               &&      \
 113          ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr))   &&      \
 114          (((__sk)->sk_bound_dev_if == (__dif))  ||                      \
 115           ((__sk)->sk_bound_dev_if == (__sdif)))                &&      \
 116          net_eq(sock_net(__sk), (__net)))
 117
 118 #endif /* _INET6_HASHTABLES_H */