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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 ACM |
28 | /* I have no idea if this is a good hash for v6 or not. -DaveM */ |
29 | static inline int inet6_ehashfn(const struct in6_addr *laddr, const u16 lport, | |
30 | const struct in6_addr *faddr, const u16 fport, | |
31 | const int ehash_size) | |
32 | { | |
33 | int hashent = (lport ^ fport); | |
34 | ||
35 | hashent ^= (laddr->s6_addr32[3] ^ faddr->s6_addr32[3]); | |
36 | hashent ^= hashent >> 16; | |
37 | hashent ^= hashent >> 8; | |
38 | return (hashent & (ehash_size - 1)); | |
39 | } | |
40 | ||
41 | static inline int inet6_sk_ehashfn(const struct sock *sk, const int ehash_size) | |
42 | { | |
43 | const struct inet_sock *inet = inet_sk(sk); | |
44 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
45 | const struct in6_addr *laddr = &np->rcv_saddr; | |
46 | const struct in6_addr *faddr = &np->daddr; | |
47 | const __u16 lport = inet->num; | |
48 | const __u16 fport = inet->dport; | |
49 | return inet6_ehashfn(laddr, lport, faddr, fport, ehash_size); | |
50 | } | |
51 | ||
52 | /* | |
53 | * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so | |
54 | * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM | |
55 | * | |
56 | * The sockhash lock must be held as a reader here. | |
57 | */ | |
58 | static inline struct sock * | |
59 | __inet6_lookup_established(struct inet_hashinfo *hashinfo, | |
60 | const struct in6_addr *saddr, | |
61 | const u16 sport, | |
62 | const struct in6_addr *daddr, | |
63 | const u16 hnum, | |
64 | const int dif) | |
65 | { | |
66 | struct sock *sk; | |
67 | const struct hlist_node *node; | |
68 | const __u32 ports = INET_COMBINED_PORTS(sport, hnum); | |
69 | /* Optimize here for direct hit, only listening connections can | |
70 | * have wildcards anyways. | |
71 | */ | |
72 | const int hash = inet6_ehashfn(daddr, hnum, saddr, sport, | |
73 | hashinfo->ehash_size); | |
74 | struct inet_ehash_bucket *head = &hashinfo->ehash[hash]; | |
75 | ||
76 | read_lock(&head->lock); | |
77 | sk_for_each(sk, node, &head->chain) { | |
78 | /* For IPV6 do the cheaper port and family tests first. */ | |
79 | if (INET6_MATCH(sk, saddr, daddr, ports, dif)) | |
80 | goto hit; /* You sunk my battleship! */ | |
81 | } | |
82 | /* Must check for a TIME_WAIT'er before going to listener hash. */ | |
83 | sk_for_each(sk, node, &(head + hashinfo->ehash_size)->chain) { | |
84 | const struct inet_timewait_sock *tw = inet_twsk(sk); | |
85 | ||
86 | if(*((__u32 *)&(tw->tw_dport)) == ports && | |
87 | sk->sk_family == PF_INET6) { | |
88 | const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk); | |
89 | ||
90 | if (ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr) && | |
91 | ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr) && | |
92 | (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif)) | |
93 | goto hit; | |
94 | } | |
95 | } | |
96 | read_unlock(&head->lock); | |
97 | return NULL; | |
98 | ||
99 | hit: | |
100 | sock_hold(sk); | |
101 | read_unlock(&head->lock); | |
102 | return sk; | |
103 | } | |
104 | ||
105 | extern struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo, | |
106 | const struct in6_addr *daddr, | |
107 | const unsigned short hnum, | |
108 | const int dif); | |
109 | ||
110 | static inline struct sock *__inet6_lookup(struct inet_hashinfo *hashinfo, | |
111 | const struct in6_addr *saddr, | |
112 | const u16 sport, | |
113 | const struct in6_addr *daddr, | |
114 | const u16 hnum, | |
115 | const int dif) | |
116 | { | |
117 | struct sock *sk = __inet6_lookup_established(hashinfo, saddr, sport, | |
118 | daddr, hnum, dif); | |
119 | if (sk) | |
120 | return sk; | |
121 | ||
122 | return inet6_lookup_listener(hashinfo, daddr, hnum, dif); | |
123 | } | |
124 | ||
505cbfc5 ACM |
125 | extern struct sock *inet6_lookup(struct inet_hashinfo *hashinfo, |
126 | const struct in6_addr *saddr, const u16 sport, | |
127 | const struct in6_addr *daddr, const u16 dport, | |
128 | const int dif); | |
5324a040 | 129 | #endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */ |
505cbfc5 | 130 | #endif /* _INET6_HASHTABLES_H */ |