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/*
* Copyright (c) 2008, 2009, 2010, 2011 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 "hmap.h"
#include "list.h"
#include "packets.h"
#include "tag.h"
#include "timeval.h"
#define MAC_MAX 2048
/* Time, in seconds, before expiring a mac_entry due to inactivity. */
#define MAC_ENTRY_IDLE_TIME 60
/* Time, in seconds, to lock an entry updated by a gratuitous ARP to avoid
* relearning based on a reflection from a bond slave. */
#define MAC_GRAT_ARP_LOCK_TIME 5
/* A MAC learning table entry. */
struct mac_entry {
struct hmap_node hmap_node; /* Node in a mac_learning hmap. */
struct list lru_node; /* Element in 'lrus' or 'free' list. */
time_t expires; /* Expiration time. */
time_t grat_arp_lock; /* Gratuitous ARP lock expiration time. */
uint8_t mac[ETH_ADDR_LEN]; /* Known MAC address. */
uint16_t vlan; /* VLAN tag. */
tag_type tag; /* Tag for this learning entry. */
/* Learned port. */
union {
void *p;
int i;
} port;
};
int mac_entry_age(const struct mac_entry *);
/* Returns true if mac_learning_insert() just created 'mac' and the caller has
* not yet properly initialized it. */
static inline bool mac_entry_is_new(const struct mac_entry *mac)
{
return !mac->tag;
}
/* Sets a gratuitous ARP lock on 'mac' that will expire in
* MAC_GRAT_ARP_LOCK_TIME seconds. */
static inline void mac_entry_set_grat_arp_lock(struct mac_entry *mac)
{
mac->grat_arp_lock = time_now() + MAC_GRAT_ARP_LOCK_TIME;
}
/* Returns true if a gratuitous ARP lock is in effect on 'mac', false if none
* has ever been asserted or if it has expired. */
static inline bool mac_entry_is_grat_arp_locked(const struct mac_entry *mac)
{
return time_now() < mac->grat_arp_lock;
}
/* MAC learning table. */
struct mac_learning {
struct hmap table; /* Learning table. */
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 mac_entry entries[MAC_MAX]; /* All entries. */
uint32_t secret; /* Secret for randomizing hash table. */
unsigned long *flood_vlans; /* Bitmap of learning disabled VLANs. */
};
/* Basics. */
struct mac_learning *mac_learning_create(void);
void mac_learning_destroy(struct mac_learning *);
void mac_learning_run(struct mac_learning *, struct tag_set *);
void mac_learning_wait(struct mac_learning *);
/* Configuration. */
bool mac_learning_set_flood_vlans(struct mac_learning *,
const unsigned long *bitmap);
/* Learning. */
bool mac_learning_may_learn(const struct mac_learning *,
const uint8_t src_mac[ETH_ADDR_LEN],
uint16_t vlan);
struct mac_entry *mac_learning_insert(struct mac_learning *,
const uint8_t src[ETH_ADDR_LEN],
uint16_t vlan);
tag_type mac_learning_changed(struct mac_learning *, struct mac_entry *);
/* Lookup. */
struct mac_entry *mac_learning_lookup(const struct mac_learning *,
const uint8_t dst[ETH_ADDR_LEN],
uint16_t vlan, tag_type *);
/* Flushing. */
void mac_learning_expire(struct mac_learning *, struct mac_entry *);
void mac_learning_flush(struct mac_learning *);
#endif /* mac-learning.h */
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