bridge: simpler hash with salt

Instead of hashing the whole Ethernet address, it should be faster
to just use the last 4 bytes. Add a random salt value to the hash
to make it more difficult to construct worst case DoS hash chains.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 8d566c13cc73e42a41933005ecf8da07f56b49f9..dd5a5d5fb280537f59cd7a0f5c29db18aae32659 100644 (file)
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -20,19 +20,24 @@
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/jhash.h>
+#include <linux/random.h>
 #include <asm/atomic.h>
+#include <asm/unaligned.h>
 #include "br_private.h"
 
 static struct kmem_cache *br_fdb_cache __read_mostly;
 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
                      const unsigned char *addr);
 
+static u32 fdb_salt __read_mostly;
+
 void __init br_fdb_init(void)
 {
        br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
                                         sizeof(struct net_bridge_fdb_entry),
                                         0,
                                         SLAB_HWCACHE_ALIGN, NULL, NULL);
+       get_random_bytes(&fdb_salt, sizeof(fdb_salt));
 }
 
 void __exit br_fdb_fini(void)
@@ -44,24 +49,26 @@ void __exit br_fdb_fini(void)
 /* if topology_changing then use forward_delay (default 15 sec)
  * otherwise keep longer (default 5 minutes)
  */
-static __inline__ unsigned long hold_time(const struct net_bridge *br)
+static inline unsigned long hold_time(const struct net_bridge *br)
 {
        return br->topology_change ? br->forward_delay : br->ageing_time;
 }
 
-static __inline__ int has_expired(const struct net_bridge *br,
+static inline int has_expired(const struct net_bridge *br,
                                  const struct net_bridge_fdb_entry *fdb)
 {
        return !fdb->is_static
                && time_before_eq(fdb->ageing_timer + hold_time(br), jiffies);
 }
 
-static __inline__ int br_mac_hash(const unsigned char *mac)
+static inline int br_mac_hash(const unsigned char *mac)
 {
-       return jhash(mac, ETH_ALEN, 0) & (BR_HASH_SIZE - 1);
+       /* use 1 byte of OUI cnd 3 bytes of NIC */
+       u32 key = get_unaligned((u32 *)(mac + 2));
+       return jhash_1word(key, fdb_salt) & (BR_HASH_SIZE - 1);
 }
 
-static __inline__ void fdb_delete(struct net_bridge_fdb_entry *f)
+static inline void fdb_delete(struct net_bridge_fdb_entry *f)
 {
        hlist_del_rcu(&f->hlist);
        br_fdb_put(f);