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 */
111