mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 21:24:00 +08:00
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
/*
|
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
|
* operating system. INET is implemented using the BSD Socket
|
|
* interface as the means of communication with the user level.
|
|
*
|
|
* Authors: Lotsa people, from code originally in tcp
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef _INET6_HASHTABLES_H
|
|
#define _INET6_HASHTABLES_H
|
|
|
|
|
|
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
|
|
#include <linux/in6.h>
|
|
#include <linux/ipv6.h>
|
|
#include <linux/types.h>
|
|
#include <linux/jhash.h>
|
|
|
|
#include <net/inet_sock.h>
|
|
|
|
#include <net/ipv6.h>
|
|
#include <net/netns/hash.h>
|
|
|
|
struct inet_hashinfo;
|
|
|
|
/* I have no idea if this is a good hash for v6 or not. -DaveM */
|
|
static inline unsigned int inet6_ehashfn(struct net *net,
|
|
const struct in6_addr *laddr, const u16 lport,
|
|
const struct in6_addr *faddr, const __be16 fport)
|
|
{
|
|
u32 ports = (lport ^ (__force u16)fport);
|
|
|
|
return jhash_3words((__force u32)laddr->s6_addr32[3],
|
|
(__force u32)faddr->s6_addr32[3],
|
|
ports, inet_ehash_secret + net_hash_mix(net));
|
|
}
|
|
|
|
static inline int inet6_sk_ehashfn(const struct sock *sk)
|
|
{
|
|
const struct inet_sock *inet = inet_sk(sk);
|
|
const struct ipv6_pinfo *np = inet6_sk(sk);
|
|
const struct in6_addr *laddr = &np->rcv_saddr;
|
|
const struct in6_addr *faddr = &np->daddr;
|
|
const __u16 lport = inet->num;
|
|
const __be16 fport = inet->dport;
|
|
struct net *net = sock_net(sk);
|
|
|
|
return inet6_ehashfn(net, laddr, lport, faddr, fport);
|
|
}
|
|
|
|
extern void __inet6_hash(struct sock *sk);
|
|
|
|
/*
|
|
* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
|
|
* we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
|
|
*
|
|
* The sockhash lock must be held as a reader here.
|
|
*/
|
|
extern struct sock *__inet6_lookup_established(struct net *net,
|
|
struct inet_hashinfo *hashinfo,
|
|
const struct in6_addr *saddr,
|
|
const __be16 sport,
|
|
const struct in6_addr *daddr,
|
|
const u16 hnum,
|
|
const int dif);
|
|
|
|
extern struct sock *inet6_lookup_listener(struct net *net,
|
|
struct inet_hashinfo *hashinfo,
|
|
const struct in6_addr *daddr,
|
|
const unsigned short hnum,
|
|
const int dif);
|
|
|
|
static inline struct sock *__inet6_lookup(struct net *net,
|
|
struct inet_hashinfo *hashinfo,
|
|
const struct in6_addr *saddr,
|
|
const __be16 sport,
|
|
const struct in6_addr *daddr,
|
|
const u16 hnum,
|
|
const int dif)
|
|
{
|
|
struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr,
|
|
sport, daddr, hnum, dif);
|
|
if (sk)
|
|
return sk;
|
|
|
|
return inet6_lookup_listener(net, hashinfo, daddr, hnum, dif);
|
|
}
|
|
|
|
extern struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
|
|
const struct in6_addr *saddr, const __be16 sport,
|
|
const struct in6_addr *daddr, const __be16 dport,
|
|
const int dif);
|
|
#endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */
|
|
#endif /* _INET6_HASHTABLES_H */
|