forked from Minki/linux
efe4208f47
TCP listener refactoring, part 4 : To speed up inet lookups, we moved IPv4 addresses from inet to struct sock_common Now is time to do the same for IPv6, because it permits us to have fast lookups for all kind of sockets, including upcoming SYN_RECV. Getting IPv6 addresses in TCP lookups currently requires two extra cache lines, plus a dereference (and memory stall). inet6_sk(sk) does the dereference of inet_sk(__sk)->pinet6 This patch is way bigger than its IPv4 counter part, because for IPv4, we could add aliases (inet_daddr, inet_rcv_saddr), while on IPv6, it's not doable easily. inet6_sk(sk)->daddr becomes sk->sk_v6_daddr inet6_sk(sk)->rcv_saddr becomes sk->sk_v6_rcv_saddr And timewait socket also have tw->tw_v6_daddr & tw->tw_v6_rcv_saddr at the same offset. We get rid of INET6_TW_MATCH() as INET6_MATCH() is now the generic macro. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
116 lines
3.4 KiB
C
116 lines
3.4 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 IS_ENABLED(CONFIG_IPV6)
|
|
#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;
|
|
|
|
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 = (((u32)lport) << 16) | (__force u32)fport;
|
|
|
|
return jhash_3words((__force u32)laddr->s6_addr32[3],
|
|
ipv6_addr_jhash(faddr),
|
|
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 in6_addr *laddr = &sk->sk_v6_rcv_saddr;
|
|
const struct in6_addr *faddr = &sk->sk_v6_daddr;
|
|
const __u16 lport = inet->inet_num;
|
|
const __be16 fport = inet->inet_dport;
|
|
struct net *net = sock_net(sk);
|
|
|
|
return inet6_ehashfn(net, laddr, lport, faddr, fport);
|
|
}
|
|
|
|
int __inet6_hash(struct sock *sk, struct inet_timewait_sock *twp);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
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);
|
|
|
|
struct sock *inet6_lookup_listener(struct net *net,
|
|
struct inet_hashinfo *hashinfo,
|
|
const struct in6_addr *saddr,
|
|
const __be16 sport,
|
|
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, saddr, sport,
|
|
daddr, hnum, dif);
|
|
}
|
|
|
|
static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
|
|
struct sk_buff *skb,
|
|
const __be16 sport,
|
|
const __be16 dport)
|
|
{
|
|
struct sock *sk = skb_steal_sock(skb);
|
|
|
|
if (sk)
|
|
return sk;
|
|
|
|
return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo,
|
|
&ipv6_hdr(skb)->saddr, sport,
|
|
&ipv6_hdr(skb)->daddr, ntohs(dport),
|
|
inet6_iif(skb));
|
|
}
|
|
|
|
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 /* IS_ENABLED(CONFIG_IPV6) */
|
|
#endif /* _INET6_HASHTABLES_H */
|