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505cbfc5 ACM |
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 | ||
5324a040 ACM |
17 | #include <linux/config.h> |
18 | ||
19 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) | |
20 | #include <linux/in6.h> | |
21 | #include <linux/ipv6.h> | |
505cbfc5 ACM |
22 | #include <linux/types.h> |
23 | ||
5324a040 ACM |
24 | #include <net/ipv6.h> |
25 | ||
505cbfc5 ACM |
26 | struct inet_hashinfo; |
27 | ||
5324a040 | 28 | /* I have no idea if this is a good hash for v6 or not. -DaveM */ |
81c3d547 ED |
29 | static inline unsigned int inet6_ehashfn(const struct in6_addr *laddr, const u16 lport, |
30 | const struct in6_addr *faddr, const u16 fport) | |
5324a040 | 31 | { |
81c3d547 | 32 | unsigned int hashent = (lport ^ fport); |
5324a040 ACM |
33 | |
34 | hashent ^= (laddr->s6_addr32[3] ^ faddr->s6_addr32[3]); | |
35 | hashent ^= hashent >> 16; | |
36 | hashent ^= hashent >> 8; | |
81c3d547 | 37 | return hashent; |
5324a040 ACM |
38 | } |
39 | ||
81c3d547 | 40 | static inline int inet6_sk_ehashfn(const struct sock *sk) |
5324a040 ACM |
41 | { |
42 | const struct inet_sock *inet = inet_sk(sk); | |
43 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
44 | const struct in6_addr *laddr = &np->rcv_saddr; | |
45 | const struct in6_addr *faddr = &np->daddr; | |
46 | const __u16 lport = inet->num; | |
47 | const __u16 fport = inet->dport; | |
81c3d547 | 48 | return inet6_ehashfn(laddr, lport, faddr, fport); |
5324a040 ACM |
49 | } |
50 | ||
51 | /* | |
52 | * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so | |
53 | * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM | |
54 | * | |
55 | * The sockhash lock must be held as a reader here. | |
56 | */ | |
57 | static inline struct sock * | |
58 | __inet6_lookup_established(struct inet_hashinfo *hashinfo, | |
59 | const struct in6_addr *saddr, | |
60 | const u16 sport, | |
61 | const struct in6_addr *daddr, | |
62 | const u16 hnum, | |
63 | const int dif) | |
64 | { | |
65 | struct sock *sk; | |
66 | const struct hlist_node *node; | |
67 | const __u32 ports = INET_COMBINED_PORTS(sport, hnum); | |
68 | /* Optimize here for direct hit, only listening connections can | |
69 | * have wildcards anyways. | |
70 | */ | |
81c3d547 ED |
71 | unsigned int hash = inet6_ehashfn(daddr, hnum, saddr, sport); |
72 | struct inet_ehash_bucket *head = inet_ehash_bucket(hashinfo, hash); | |
5324a040 | 73 | |
81c3d547 | 74 | prefetch(head->chain.first); |
5324a040 ACM |
75 | read_lock(&head->lock); |
76 | sk_for_each(sk, node, &head->chain) { | |
77 | /* For IPV6 do the cheaper port and family tests first. */ | |
81c3d547 | 78 | if (INET6_MATCH(sk, hash, saddr, daddr, ports, dif)) |
5324a040 ACM |
79 | goto hit; /* You sunk my battleship! */ |
80 | } | |
81 | /* Must check for a TIME_WAIT'er before going to listener hash. */ | |
82 | sk_for_each(sk, node, &(head + hashinfo->ehash_size)->chain) { | |
83 | const struct inet_timewait_sock *tw = inet_twsk(sk); | |
84 | ||
85 | if(*((__u32 *)&(tw->tw_dport)) == ports && | |
86 | sk->sk_family == PF_INET6) { | |
87 | const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk); | |
88 | ||
89 | if (ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr) && | |
90 | ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr) && | |
91 | (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif)) | |
92 | goto hit; | |
93 | } | |
94 | } | |
95 | read_unlock(&head->lock); | |
96 | return NULL; | |
97 | ||
98 | hit: | |
99 | sock_hold(sk); | |
100 | read_unlock(&head->lock); | |
101 | return sk; | |
102 | } | |
103 | ||
104 | extern struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo, | |
105 | const struct in6_addr *daddr, | |
106 | const unsigned short hnum, | |
107 | const int dif); | |
108 | ||
109 | static inline struct sock *__inet6_lookup(struct inet_hashinfo *hashinfo, | |
110 | const struct in6_addr *saddr, | |
111 | const u16 sport, | |
112 | const struct in6_addr *daddr, | |
113 | const u16 hnum, | |
114 | const int dif) | |
115 | { | |
116 | struct sock *sk = __inet6_lookup_established(hashinfo, saddr, sport, | |
117 | daddr, hnum, dif); | |
118 | if (sk) | |
119 | return sk; | |
120 | ||
121 | return inet6_lookup_listener(hashinfo, daddr, hnum, dif); | |
122 | } | |
123 | ||
505cbfc5 ACM |
124 | extern struct sock *inet6_lookup(struct inet_hashinfo *hashinfo, |
125 | const struct in6_addr *saddr, const u16 sport, | |
126 | const struct in6_addr *daddr, const u16 dport, | |
127 | const int dif); | |
5324a040 | 128 | #endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */ |
505cbfc5 | 129 | #endif /* _INET6_HASHTABLES_H */ |