/*
* Copyright (c) 2008, 2009 Nicira Networks.
*
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
*
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
*/
#include <config.h>
#define THIS_MODULE VLM_mac_learning
#include "vlog.h"
-#define MAC_HASH_BITS 10
-#define MAC_HASH_MASK (MAC_HASH_SIZE - 1)
-#define MAC_HASH_SIZE (1u << MAC_HASH_BITS)
-
-#define MAC_MAX 1024
-
-/* A MAC learning table entry. */
-struct mac_entry {
- struct list hash_node; /* Element in a mac_learning 'table' list. */
- struct list lru_node; /* Element in 'lrus' or 'free' list. */
- time_t expires; /* Expiration time. */
- uint8_t mac[ETH_ADDR_LEN]; /* Known MAC address. */
- uint16_t vlan; /* VLAN tag. */
- int port; /* Port on which MAC was most recently seen. */
- tag_type tag; /* Tag for this learning entry. */
-};
-
-/* MAC learning table. */
-struct mac_learning {
- struct list free; /* Not-in-use entries. */
- struct list lrus; /* In-use entries, least recently used at the
- front, most recently used at the back. */
- struct list table[MAC_HASH_SIZE]; /* Hash table. */
- struct mac_entry entries[MAC_MAX]; /* All entries. */
- uint32_t secret; /* Secret for */
-};
+/* Returns the number of seconds since 'e' was last learned. */
+int
+mac_entry_age(const struct mac_entry *e)
+{
+ time_t remaining = e->expires - time_now();
+ return MAC_ENTRY_IDLE_TIME - remaining;
+}
static uint32_t
mac_table_hash(const uint8_t mac[ETH_ADDR_LEN], uint16_t vlan)
/* Make the entry most-recently-used. */
list_remove(&e->lru_node);
list_push_back(&ml->lrus, &e->lru_node);
- e->expires = time_now() + 60;
+ e->expires = time_now() + MAC_ENTRY_IDLE_TIME;
/* Did we learn something? */
if (e->port != src_port) {