inet6_hashtables.h revision b50026b5ac8fe2932e6af0c54b21da0913c4c1c7 
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
41int __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 */
49struct 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
56struct 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
63static 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
80static 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
96struct 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 */
102