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/*
* 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.
*
* 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.
*/
#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 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 */
};
struct mac_learning *mac_learning_create(void);
void mac_learning_destroy(struct mac_learning *);
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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