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[karo-tx-linux.git] / include / net / inet6_hashtables.h
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
29 struct inet_hashinfo;
30
31 static 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 int __inet6_hash(struct sock *sk, struct inet_timewait_sock *twp);
42
43 /*
44  * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
45  * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
46  *
47  * The sockhash lock must be held as a reader here.
48  */
49 struct sock *__inet6_lookup_established(struct net *net,
50                                         struct inet_hashinfo *hashinfo,
51                                         const struct in6_addr *saddr,
52                                         const __be16 sport,
53                                         const struct in6_addr *daddr,
54                                         const u16 hnum, const int dif);
55
56 struct sock *inet6_lookup_listener(struct net *net,
57                                    struct inet_hashinfo *hashinfo,
58                                    const struct in6_addr *saddr,
59                                    const __be16 sport,
60                                    const struct in6_addr *daddr,
61                                    const unsigned short hnum, const int dif);
62
63 static inline struct sock *__inet6_lookup(struct net *net,
64                                           struct inet_hashinfo *hashinfo,
65                                           const struct in6_addr *saddr,
66                                           const __be16 sport,
67                                           const struct in6_addr *daddr,
68                                           const u16 hnum,
69                                           const int dif)
70 {
71         struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr,
72                                                 sport, daddr, hnum, dif);
73         if (sk)
74                 return sk;
75
76         return inet6_lookup_listener(net, hashinfo, saddr, sport,
77                                      daddr, hnum, dif);
78 }
79
80 static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
81                                               struct sk_buff *skb,
82                                               const __be16 sport,
83                                               const __be16 dport)
84 {
85         struct sock *sk = skb_steal_sock(skb);
86
87         if (sk)
88                 return sk;
89
90         return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo,
91                               &ipv6_hdr(skb)->saddr, sport,
92                               &ipv6_hdr(skb)->daddr, ntohs(dport),
93                               inet6_iif(skb));
94 }
95
96 struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
97                           const struct in6_addr *saddr, const __be16 sport,
98                           const struct in6_addr *daddr, const __be16 dport,
99                           const int dif);
100 #endif /* IS_ENABLED(CONFIG_IPV6) */
101 #endif /* _INET6_HASHTABLES_H */