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[INET]: Use jhash + random secret for ehash.

Browse source 
The days are gone when this was not an issue, there are folks out
there with huge bot networks that can be used to attack the
established hash tables on remote systems.

So just like the routing cache and connection tracking
hash, use Jenkins hash with random secret input.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2007-03-23 11:40:27 -07:00 committed by David S. Miller
parent d30045a0bc
commit b3da2cf37c
4 changed files with 35 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
include/net/inet6_hashtables.h
View file

@ -19,6 +19,9 @@
#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>
@ -28,12 +31,11 @@ struct inet_hashinfo;
static inline unsigned int inet6_ehashfn(const struct in6_addr *laddr, const u16 lport,
const struct in6_addr *faddr, const __be16 fport)
{
unsigned int hashent = (lport ^ (__force u16)fport);
u32 ports = (lport ^ (__force u16)fport);
hashent ^= (__force u32)(laddr->s6_addr32[3] ^ faddr->s6_addr32[3]);
hashent ^= hashent >> 16;
hashent ^= hashent >> 8;
return hashent;
return jhash_3words((__force u32)laddr->s6_addr32[3],
(__force u32)faddr->s6_addr32[3],
ports, inet_ehash_secret);
}
static inline int inet6_sk_ehashfn(const struct sock *sk)

11
include/net/inet_sock.h
View file

@ -19,6 +19,7 @@
#include <linux/string.h>
#include <linux/types.h>
#include <linux/jhash.h>
#include <net/flow.h>
#include <net/sock.h>
@ -167,13 +168,15 @@ static inline void inet_sk_copy_descendant(struct sock *sk_to,
extern int inet_sk_rebuild_header(struct sock *sk);
extern u32 inet_ehash_secret;
extern void build_ehash_secret(void);
static inline unsigned int inet_ehashfn(const __be32 laddr, const __u16 lport,
const __be32 faddr, const __be16 fport)
{
unsigned int h = ((__force __u32)laddr ^ lport) ^ ((__force __u32)faddr ^ (__force __u32)fport);
h ^= h >> 16;
h ^= h >> 8;
return h;
return jhash_2words((__force __u32) laddr ^ (__force __u32) faddr,
((__u32) lport) << 16 | (__force __u32)fport,
inet_ehash_secret);
}
static inline int inet_sk_ehashfn(const struct sock *sk)

16
net/ipv4/af_inet.c
View file

@ -87,6 +87,7 @@
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/netfilter_ipv4.h>
#include <linux/random.h>
#include <asm/uaccess.h>
#include <asm/system.h>
@ -217,6 +218,16 @@ int inet_listen(struct socket *sock, int backlog)
return err;
}
u32 inet_ehash_secret;
EXPORT_SYMBOL(inet_ehash_secret);
void build_ehash_secret(void)
{
while (!inet_ehash_secret)
get_random_bytes(&inet_ehash_secret, 4);
}
EXPORT_SYMBOL(build_ehash_secret);
/*
* Create an inet socket.
*/
@ -233,6 +244,11 @@ static int inet_create(struct socket *sock, int protocol)
int try_loading_module = 0;
int err;
if (sock->type != SOCK_RAW &&
sock->type != SOCK_DGRAM &&
!inet_ehash_secret)
build_ehash_secret();
sock->state = SS_UNCONNECTED;
/* Look for the requested type/protocol pair. */

5
net/ipv6/af_inet6.c
View file

@ -98,6 +98,11 @@ static int inet6_create(struct socket *sock, int protocol)
int try_loading_module = 0;
int err;
if (sock->type != SOCK_RAW &&
sock->type != SOCK_DGRAM &&
!inet_ehash_secret)
build_ehash_secret();
/* Look for the requested type/protocol pair. */
answer = NULL;
lookup_protocol: