mirror of https://gitee.com/openkylin/linux.git
130 lines
4.0 KiB
C
130 lines
4.0 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
|
|
|
|
#include <linux/config.h>
|
|
|
|
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
|
|
#include <linux/in6.h>
|
|
#include <linux/ipv6.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <net/ipv6.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(const struct in6_addr *laddr, const u16 lport,
|
|
const struct in6_addr *faddr, const u16 fport)
|
|
{
|
|
unsigned int hashent = (lport ^ fport);
|
|
|
|
hashent ^= (laddr->s6_addr32[3] ^ faddr->s6_addr32[3]);
|
|
hashent ^= hashent >> 16;
|
|
hashent ^= hashent >> 8;
|
|
return hashent;
|
|
}
|
|
|
|
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 __u16 fport = inet->dport;
|
|
return inet6_ehashfn(laddr, lport, faddr, fport);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static inline struct sock *
|
|
__inet6_lookup_established(struct inet_hashinfo *hashinfo,
|
|
const struct in6_addr *saddr,
|
|
const u16 sport,
|
|
const struct in6_addr *daddr,
|
|
const u16 hnum,
|
|
const int dif)
|
|
{
|
|
struct sock *sk;
|
|
const struct hlist_node *node;
|
|
const __u32 ports = INET_COMBINED_PORTS(sport, hnum);
|
|
/* Optimize here for direct hit, only listening connections can
|
|
* have wildcards anyways.
|
|
*/
|
|
unsigned int hash = inet6_ehashfn(daddr, hnum, saddr, sport);
|
|
struct inet_ehash_bucket *head = inet_ehash_bucket(hashinfo, hash);
|
|
|
|
prefetch(head->chain.first);
|
|
read_lock(&head->lock);
|
|
sk_for_each(sk, node, &head->chain) {
|
|
/* For IPV6 do the cheaper port and family tests first. */
|
|
if (INET6_MATCH(sk, hash, saddr, daddr, ports, dif))
|
|
goto hit; /* You sunk my battleship! */
|
|
}
|
|
/* Must check for a TIME_WAIT'er before going to listener hash. */
|
|
sk_for_each(sk, node, &(head + hashinfo->ehash_size)->chain) {
|
|
const struct inet_timewait_sock *tw = inet_twsk(sk);
|
|
|
|
if(*((__u32 *)&(tw->tw_dport)) == ports &&
|
|
sk->sk_family == PF_INET6) {
|
|
const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
|
|
|
|
if (ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr) &&
|
|
ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr) &&
|
|
(!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif))
|
|
goto hit;
|
|
}
|
|
}
|
|
read_unlock(&head->lock);
|
|
return NULL;
|
|
|
|
hit:
|
|
sock_hold(sk);
|
|
read_unlock(&head->lock);
|
|
return sk;
|
|
}
|
|
|
|
extern struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo,
|
|
const struct in6_addr *daddr,
|
|
const unsigned short hnum,
|
|
const int dif);
|
|
|
|
static inline struct sock *__inet6_lookup(struct inet_hashinfo *hashinfo,
|
|
const struct in6_addr *saddr,
|
|
const u16 sport,
|
|
const struct in6_addr *daddr,
|
|
const u16 hnum,
|
|
const int dif)
|
|
{
|
|
struct sock *sk = __inet6_lookup_established(hashinfo, saddr, sport,
|
|
daddr, hnum, dif);
|
|
if (sk)
|
|
return sk;
|
|
|
|
return inet6_lookup_listener(hashinfo, daddr, hnum, dif);
|
|
}
|
|
|
|
extern struct sock *inet6_lookup(struct inet_hashinfo *hashinfo,
|
|
const struct in6_addr *saddr, const u16 sport,
|
|
const struct in6_addr *daddr, const u16 dport,
|
|
const int dif);
|
|
#endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */
|
|
#endif /* _INET6_HASHTABLES_H */
|