Linux 4.8.3
[linux/fpc-iii.git] / include / net / inet6_hashtables.h
blobb87becacd9d347d9a7dac23fb9e08133615a9d11
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.
6 * Authors: Lotsa people, from code originally in tcp
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.
14 #ifndef _INET6_HASHTABLES_H
15 #define _INET6_HASHTABLES_H
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>
24 #include <net/inet_sock.h>
26 #include <net/ipv6.h>
27 #include <net/netns/hash.h>
29 struct inet_hashinfo;
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)
37 const u32 ports = (((u32)lport) << 16) | (__force u32)fport;
38 return jhash_3words(lhash, fhash, ports, initval);
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
45 * The sockhash lock must be held as a reader here.
47 struct 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);
54 struct sock *inet6_lookup_listener(struct net *net,
55 struct inet_hashinfo *hashinfo,
56 struct sk_buff *skb, int doff,
57 const struct in6_addr *saddr,
58 const __be16 sport,
59 const struct in6_addr *daddr,
60 const unsigned short hnum, const int dif);
62 static inline struct sock *__inet6_lookup(struct net *net,
63 struct inet_hashinfo *hashinfo,
64 struct sk_buff *skb, int doff,
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 bool *refcounted)
72 struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr,
73 sport, daddr, hnum, dif);
74 *refcounted = true;
75 if (sk)
76 return sk;
77 *refcounted = false;
78 return inet6_lookup_listener(net, hashinfo, skb, doff, saddr, sport,
79 daddr, hnum, dif);
82 static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
83 struct sk_buff *skb, int doff,
84 const __be16 sport,
85 const __be16 dport,
86 int iif,
87 bool *refcounted)
89 struct sock *sk = skb_steal_sock(skb);
91 *refcounted = true;
92 if (sk)
93 return sk;
95 return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
96 doff, &ipv6_hdr(skb)->saddr, sport,
97 &ipv6_hdr(skb)->daddr, ntohs(dport),
98 iif, refcounted);
101 struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
102 struct sk_buff *skb, int doff,
103 const struct in6_addr *saddr, const __be16 sport,
104 const struct in6_addr *daddr, const __be16 dport,
105 const int dif);
107 int inet6_hash(struct sock *sk);
108 #endif /* IS_ENABLED(CONFIG_IPV6) */
110 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \
111 (((__sk)->sk_portpair == (__ports)) && \
112 ((__sk)->sk_family == AF_INET6) && \
113 ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr)) && \
114 ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr)) && \
115 (!(__sk)->sk_bound_dev_if || \
116 ((__sk)->sk_bound_dev_if == (__dif))) && \
117 net_eq(sock_net(__sk), (__net)))
119 #endif /* _INET6_HASHTABLES_H */