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/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
*
* 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 "ovs-atomic.h"
#include "ovs-thread.h"
#include "packets.h"
#include "tag.h"
#include "timeval.h"
struct mac_learning;
/* Default maximum size of a MAC learning table, in entries. */
#define MAC_DEFAULT_MAX 2048
/* Time, in seconds, before expiring a mac_entry due to inactivity. */
#define MAC_ENTRY_DEFAULT_IDLE_TIME 300
/* 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.
* Guarded by owning 'mac_learning''s rwlock */
struct mac_entry {
struct hmap_node hmap_node; /* Node in a mac_learning hmap. */
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. */
/* The following are marked guarded to prevent users from iterating over or
* accessing a mac_entry without hodling the parent mac_learning rwlock. */
struct list lru_node OVS_GUARDED; /* Element in 'lrus' list. */
/* Learned port. */
union {
void *p;
ofp_port_t ofp_port;
} port OVS_GUARDED;
};
/* 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 lrus OVS_GUARDED; /* In-use entries, least recently used at the
front, most recently used at the back. */
uint32_t secret; /* Secret for randomizing hash table. */
unsigned long *flood_vlans; /* Bitmap of learning disabled VLANs. */
unsigned int idle_time; /* Max age before deleting an entry. */
size_t max_entries; /* Max number of learned MACs. */
struct tag_set tags; /* Tags which have changed. */
atomic_int ref_cnt;
struct ovs_rwlock rwlock;
};
int mac_entry_age(const struct mac_learning *ml, const struct mac_entry *e)
OVS_REQ_RDLOCK(ml->rwlock);
/* Basics. */
struct mac_learning *mac_learning_create(unsigned int idle_time);
struct mac_learning *mac_learning_ref(const struct mac_learning *);
void mac_learning_unref(struct mac_learning *);
void mac_learning_run(struct mac_learning *ml, struct tag_set *)
OVS_REQ_WRLOCK(ml->rwlock);
void mac_learning_wait(struct mac_learning *ml)
OVS_REQ_RDLOCK(ml->rwlock);
/* Configuration. */
bool mac_learning_set_flood_vlans(struct mac_learning *ml,
const unsigned long *bitmap)
OVS_REQ_WRLOCK(ml->rwlock);
void mac_learning_set_idle_time(struct mac_learning *ml,
unsigned int idle_time)
OVS_REQ_WRLOCK(ml->rwlock);
void mac_learning_set_max_entries(struct mac_learning *ml, size_t max_entries)
OVS_REQ_WRLOCK(ml->rwlock);
/* Learning. */
bool mac_learning_may_learn(const struct mac_learning *ml,
const uint8_t src_mac[ETH_ADDR_LEN],
uint16_t vlan)
OVS_REQ_RDLOCK(ml->rwlock);
struct mac_entry *mac_learning_insert(struct mac_learning *ml,
const uint8_t src[ETH_ADDR_LEN],
uint16_t vlan)
OVS_REQ_WRLOCK(ml->rwlock);
void mac_learning_changed(struct mac_learning *ml, struct mac_entry *e)
OVS_REQ_WRLOCK(ml->rwlock);
/* Lookup. */
struct mac_entry *mac_learning_lookup(const struct mac_learning *ml,
const uint8_t dst[ETH_ADDR_LEN],
uint16_t vlan, tag_type *)
OVS_REQ_RDLOCK(ml->rwlock);
/* Flushing. */
void mac_learning_expire(struct mac_learning *ml, struct mac_entry *e)
OVS_REQ_WRLOCK(ml->rwlock);
void mac_learning_flush(struct mac_learning *ml, struct tag_set *)
OVS_REQ_WRLOCK(ml->rwlock);
#endif /* mac-learning.h */
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