0b4419162a
There are many possible ways to add this "salt", thus I made this patch to be the last in the series to change it if required. Currently I propose to use the struct net pointer itself as this salt, but since this pointer is most often cache-line aligned, shift this right to eliminate the bits, that are most often zeroed. After this, simply add this mix to prepared hashfn-s. For CONFIG_NET_NS=n case this salt is 0 and no changes in hashfn appear. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
100 lines
3.0 KiB
C
100 lines
3.0 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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#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 <linux/jhash.h>
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#include <net/inet_sock.h>
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#include <net/ipv6.h>
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#include <net/netns/hash.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 unsigned int inet6_ehashfn(struct net *net,
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const struct in6_addr *laddr, const u16 lport,
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const struct in6_addr *faddr, const __be16 fport)
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{
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u32 ports = (lport ^ (__force u16)fport);
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return jhash_3words((__force u32)laddr->s6_addr32[3],
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(__force u32)faddr->s6_addr32[3],
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ports, inet_ehash_secret + net_hash_mix(net));
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}
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static inline int inet6_sk_ehashfn(const struct sock *sk)
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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 __be16 fport = inet->dport;
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struct net *net = sock_net(sk);
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return inet6_ehashfn(net, laddr, lport, faddr, fport);
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}
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extern void __inet6_hash(struct sock *sk);
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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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extern struct sock *__inet6_lookup_established(struct net *net,
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struct inet_hashinfo *hashinfo,
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const struct in6_addr *saddr,
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const __be16 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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extern struct sock *inet6_lookup_listener(struct net *net,
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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 net *net,
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struct inet_hashinfo *hashinfo,
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const struct in6_addr *saddr,
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const __be16 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(net, hashinfo, saddr,
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sport, daddr, hnum, dif);
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if (sk)
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return sk;
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return inet6_lookup_listener(net, hashinfo, daddr, hnum, dif);
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}
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extern struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
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const struct in6_addr *saddr, const __be16 sport,
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const struct in6_addr *daddr, const __be16 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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