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ipv6: split inet6_ehashfn to hash functions per compilation unit 

This patch splits the inet6_ehashfn into separate ones in
ipv6/inet6_hashtables.o and ipv6/udp.o to ease the introduction of
seperate secrets keys later.

Cc: Eric Dumazet <edumazet@google.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hannes Frederic Sowa 2013-10-19 21:48:52 +02:00 committed by David S. Miller
parent 65cd8033ff
commit b50026b5ac
4 changed files with 49 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
include/net/inet6_hashtables.h
View File

@ -28,28 +28,14 @@
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)
static inline unsigned int __inet6_ehashfn(const u32 lhash,
const u16 lport,
const u32 fhash,
const __be16 fport,
const u32 initval)
{
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);
const u32 ports = (((u32)lport) << 16) | (__force u32)fport;
return jhash_3words(lhash, fhash, ports, initval);
}
int __inet6_hash(struct sock *sk, struct inet_timewait_sock *twp);

4
include/net/ipv6.h
View File

@ -539,14 +539,14 @@ static inline u32 ipv6_addr_hash(const struct in6_addr *a)
}
/* more secured version of ipv6_addr_hash() */
static inline u32 ipv6_addr_jhash(const struct in6_addr *a)
static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
{
u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
return jhash_3words(v,
(__force u32)a->s6_addr32[2],
(__force u32)a->s6_addr32[3],
ipv6_hash_secret);
initval);
}
static inline bool ipv6_addr_loopback(const struct in6_addr *a)

24
net/ipv6/inet6_hashtables.c
View File

@ -23,6 +23,30 @@
#include <net/secure_seq.h>
#include <net/ip.h>
static unsigned int inet6_ehashfn(struct net *net,
const struct in6_addr *laddr,
const u16 lport,
const struct in6_addr *faddr,
const __be16 fport)
{
const u32 lhash = (__force u32)laddr->s6_addr32[3];
const u32 fhash = __ipv6_addr_jhash(faddr, ipv6_hash_secret);
return __inet6_ehashfn(lhash, lport, fhash, fport,
inet_ehash_secret + net_hash_mix(net));
}
static 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 *tw)
{
struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;

20
net/ipv6/udp.c
View File

@ -53,6 +53,18 @@
#include <trace/events/skb.h>
#include "udp_impl.h"
static unsigned int udp6_ehashfn(struct net *net,
const struct in6_addr *laddr,
const u16 lport,
const struct in6_addr *faddr,
const __be16 fport)
{
const u32 lhash = (__force u32)laddr->s6_addr32[3];
const u32 fhash = __ipv6_addr_jhash(faddr, ipv6_hash_secret);
return __inet6_ehashfn(lhash, lport, fhash, fport,
inet_ehash_secret + net_hash_mix(net));
}
int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
{
const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
@ -214,8 +226,8 @@ begin:
badness = score;
reuseport = sk->sk_reuseport;
if (reuseport) {
hash = inet6_ehashfn(net, daddr, hnum,
saddr, sport);
hash = udp6_ehashfn(net, daddr, hnum,
saddr, sport);
matches = 1;
} else if (score == SCORE2_MAX)
goto exact_match;
@ -295,8 +307,8 @@ begin:
badness = score;
reuseport = sk->sk_reuseport;
if (reuseport) {
hash = inet6_ehashfn(net, daddr, hnum,
saddr, sport);
hash = udp6_ehashfn(net, daddr, hnum,
saddr, sport);
matches = 1;
}
} else if (score == badness && reuseport) {