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/*
* Copyright (c) 2008, 2009 Nicira Networks.
*
* 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:
*
* 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.
*/
#ifndef MAC_LEARNING_H
#define MAC_LEARNING_H 1
#include <time.h>
#include "list.h"
#include "packets.h"
#include "tag.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 2048
/* Time, in seconds, before expiring a mac_entry due to inactivity. */
#define MAC_ENTRY_IDLE_TIME 60
/* 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. */
};
int mac_entry_age(const struct mac_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 */
unsigned long *non_learning_vlans; /* Bitmap of learning disabled VLANs. */
};
struct mac_learning *mac_learning_create(void);
void mac_learning_destroy(struct mac_learning *);
bool mac_learning_set_disabled_vlans(struct mac_learning *,
unsigned long *bitmap);
tag_type mac_learning_learn(struct mac_learning *,
const uint8_t src[ETH_ADDR_LEN], uint16_t vlan,
uint16_t src_port);
int mac_learning_lookup(const struct mac_learning *,
const uint8_t dst[ETH_ADDR_LEN], uint16_t vlan);
int mac_learning_lookup_tag(const struct mac_learning *,
const uint8_t dst[ETH_ADDR_LEN],
uint16_t vlan, tag_type *tag);
void mac_learning_flush(struct mac_learning *);
void mac_learning_run(struct mac_learning *, struct tag_set *);
void mac_learning_wait(struct mac_learning *);
#endif /* mac-learning.h */
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