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