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authorDavid S. Miller <davem@davemloft.net>2007-03-23 11:40:27 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-25 22:28:06 -0700
commitb3da2cf37c5c6e47698957a25ab43a7223dbb90f (patch)
treee8892392aaf7e3d3544ede23c21791e2317b177d
parentd30045a0bcf144753869175dd9d840f7ceaf4aba (diff)
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[INET]: Use jhash + random secret for ehash.
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>
-rw-r--r--include/net/inet6_hashtables.h12
-rw-r--r--include/net/inet_sock.h11
-rw-r--r--net/ipv4/af_inet.c16
-rw-r--r--net/ipv6/af_inet6.c5
4 files changed, 35 insertions, 9 deletions
diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
index c28e424f53d..668056b4bb0 100644
--- a/include/net/inet6_hashtables.h
+++ b/include/net/inet6_hashtables.h
@@ -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)
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index ce6da97bc84..62daf214931 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -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)
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index f011390f19c..b7b7278d801 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -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 @@ out:
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. */
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 82572b50754..df31cdd33cd 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -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: