131 lines
4.0 KiB
C
131 lines
4.0 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Authors: Lotsa people, from code originally in tcp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _INET6_HASHTABLES_H
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#define _INET6_HASHTABLES_H
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#include <linux/config.h>
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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#include <linux/in6.h>
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#include <linux/ipv6.h>
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#include <linux/types.h>
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#include <net/ipv6.h>
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struct inet_hashinfo;
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/* I have no idea if this is a good hash for v6 or not. -DaveM */
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static inline int inet6_ehashfn(const struct in6_addr *laddr, const u16 lport,
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const struct in6_addr *faddr, const u16 fport,
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const int ehash_size)
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{
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int hashent = (lport ^ fport);
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hashent ^= (laddr->s6_addr32[3] ^ faddr->s6_addr32[3]);
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hashent ^= hashent >> 16;
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hashent ^= hashent >> 8;
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return (hashent & (ehash_size - 1));
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}
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static inline int inet6_sk_ehashfn(const struct sock *sk, const int ehash_size)
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{
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const struct inet_sock *inet = inet_sk(sk);
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const struct ipv6_pinfo *np = inet6_sk(sk);
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const struct in6_addr *laddr = &np->rcv_saddr;
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const struct in6_addr *faddr = &np->daddr;
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const __u16 lport = inet->num;
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const __u16 fport = inet->dport;
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return inet6_ehashfn(laddr, lport, faddr, fport, ehash_size);
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}
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/*
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* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
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* we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
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*
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* The sockhash lock must be held as a reader here.
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*/
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static inline struct sock *
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__inet6_lookup_established(struct inet_hashinfo *hashinfo,
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const struct in6_addr *saddr,
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const u16 sport,
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const struct in6_addr *daddr,
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const u16 hnum,
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const int dif)
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{
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struct sock *sk;
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const struct hlist_node *node;
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const __u32 ports = INET_COMBINED_PORTS(sport, hnum);
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/* Optimize here for direct hit, only listening connections can
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* have wildcards anyways.
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*/
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const int hash = inet6_ehashfn(daddr, hnum, saddr, sport,
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hashinfo->ehash_size);
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struct inet_ehash_bucket *head = &hashinfo->ehash[hash];
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read_lock(&head->lock);
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sk_for_each(sk, node, &head->chain) {
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/* For IPV6 do the cheaper port and family tests first. */
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if (INET6_MATCH(sk, saddr, daddr, ports, dif))
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goto hit; /* You sunk my battleship! */
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}
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/* Must check for a TIME_WAIT'er before going to listener hash. */
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sk_for_each(sk, node, &(head + hashinfo->ehash_size)->chain) {
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const struct inet_timewait_sock *tw = inet_twsk(sk);
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if(*((__u32 *)&(tw->tw_dport)) == ports &&
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sk->sk_family == PF_INET6) {
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const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
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if (ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr) &&
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ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr) &&
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(!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif))
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goto hit;
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}
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}
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read_unlock(&head->lock);
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return NULL;
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hit:
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sock_hold(sk);
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read_unlock(&head->lock);
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return sk;
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}
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extern struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo,
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const struct in6_addr *daddr,
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const unsigned short hnum,
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const int dif);
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static inline struct sock *__inet6_lookup(struct inet_hashinfo *hashinfo,
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const struct in6_addr *saddr,
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const u16 sport,
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const struct in6_addr *daddr,
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const u16 hnum,
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const int dif)
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{
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struct sock *sk = __inet6_lookup_established(hashinfo, saddr, sport,
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daddr, hnum, dif);
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if (sk)
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return sk;
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return inet6_lookup_listener(hashinfo, daddr, hnum, dif);
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}
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extern struct sock *inet6_lookup(struct inet_hashinfo *hashinfo,
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const struct in6_addr *saddr, const u16 sport,
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const struct in6_addr *daddr, const u16 dport,
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const int dif);
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#endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */
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#endif /* _INET6_HASHTABLES_H */
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