LXR linux/include/net/inet6

   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
  25struct inet_hashinfo;
  26
  27static 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 */
  43struct 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
  51struct 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
  60static 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
  81static 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, refcounted);
  89
  90        if (sk)
  91                return sk;
  92
  93        return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
  94                              doff, &ipv6_hdr(skb)->saddr, sport,
  95                              &ipv6_hdr(skb)->daddr, ntohs(dport),
  96                              iif, sdif, refcounted);
  97}
  98
  99struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
 100                          struct sk_buff *skb, int doff,
 101                          const struct in6_addr *saddr, const __be16 sport,
 102                          const struct in6_addr *daddr, const __be16 dport,
 103                          const int dif);
 104
 105int inet6_hash(struct sock *sk);
 106#endif /* IS_ENABLED(CONFIG_IPV6) */
 107
 108#define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif, __sdif) \
 109        (((__sk)->sk_portpair == (__ports))                     &&      \
 110         ((__sk)->sk_family == AF_INET6)                        &&      \
 111         ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr))               &&      \
 112         ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr))   &&      \
 113         (((__sk)->sk_bound_dev_if == (__dif))  ||                      \
 114          ((__sk)->sk_bound_dev_if == (__sdif)))                &&      \
 115         net_eq(sock_net(__sk), (__net)))
 116
 117#endif /* _INET6_HASHTABLES_H */
 118