LXR linux/include/net/inet6

   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
  29struct inet_hashinfo;
  30
  31static 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 */
  47struct 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                                        const int sdif);
  54
  55struct sock *inet6_lookup_listener(struct net *net,
  56                                   struct inet_hashinfo *hashinfo,
  57                                   struct sk_buff *skb, int doff,
  58                                   const struct in6_addr *saddr,
  59                                   const __be16 sport,
  60                                   const struct in6_addr *daddr,
  61                                   const unsigned short hnum,
  62                                   const int dif, const int sdif);
  63
  64static inline struct sock *__inet6_lookup(struct net *net,
  65                                          struct inet_hashinfo *hashinfo,
  66                                          struct sk_buff *skb, int doff,
  67                                          const struct in6_addr *saddr,
  68                                          const __be16 sport,
  69                                          const struct in6_addr *daddr,
  70                                          const u16 hnum,
  71                                          const int dif, const int sdif,
  72                                          bool *refcounted)
  73{
  74        struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr,
  75                                                     sport, daddr, hnum,
  76                                                     dif, sdif);
  77        *refcounted = true;
  78        if (sk)
  79                return sk;
  80        *refcounted = false;
  81        return inet6_lookup_listener(net, hashinfo, skb, doff, saddr, sport,
  82                                     daddr, hnum, dif, sdif);
  83}
  84
  85static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
  86                                              struct sk_buff *skb, int doff,
  87                                              const __be16 sport,
  88                                              const __be16 dport,
  89                                              int iif, int sdif,
  90                                              bool *refcounted)
  91{
  92        struct sock *sk = skb_steal_sock(skb);
  93
  94        *refcounted = true;
  95        if (sk)
  96                return sk;
  97
  98        return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
  99                              doff, &ipv6_hdr(skb)->saddr, sport,
 100                              &ipv6_hdr(skb)->daddr, ntohs(dport),
 101                              iif, sdif, refcounted);
 102}
 103
 104struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
 105                          struct sk_buff *skb, int doff,
 106                          const struct in6_addr *saddr, const __be16 sport,
 107                          const struct in6_addr *daddr, const __be16 dport,
 108                          const int dif);
 109
 110int inet6_hash(struct sock *sk);
 111#endif /* IS_ENABLED(CONFIG_IPV6) */
 112
 113#define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif, __sdif) \
 114        (((__sk)->sk_portpair == (__ports))                     &&      \
 115         ((__sk)->sk_family == AF_INET6)                        &&      \
 116         ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr))               &&      \
 117         ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr))   &&      \
 118         (!(__sk)->sk_bound_dev_if      ||                              \
 119           ((__sk)->sk_bound_dev_if == (__dif)) ||                      \
 120           ((__sk)->sk_bound_dev_if == (__sdif)))               &&      \
 121         net_eq(sock_net(__sk), (__net)))
 122
 123#endif /* _INET6_HASHTABLES_H */
 124