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 == (__dif)) || \
119 ((__sk)->sk_bound_dev_if == (__sdif))) && \
120 net_eq(sock_net(__sk), (__net)))
121
122#endif /* _INET6_HASHTABLES_H */
123