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https://github.com/openvswitch/ovs
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2a4ae6357e
These new semantics are less efficient in the case where the flood_vlans actually changed, but that should be very rare. There are no advantages to this change on its own, but upcoming commits will add multiple layers between the code supplying the flood_vlans and actually calling mac_learning_set_flood_vlans(). Consistency in this multilayered interface seems valuable, and the rest of it does not transfer ownership from the caller to the callee.
120 lines
4.1 KiB
C
120 lines
4.1 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MAC_LEARNING_H
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#define MAC_LEARNING_H 1
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#include <time.h>
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#include "list.h"
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#include "packets.h"
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#include "tag.h"
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#include "timeval.h"
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#define MAC_HASH_BITS 10
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#define MAC_HASH_MASK (MAC_HASH_SIZE - 1)
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#define MAC_HASH_SIZE (1u << MAC_HASH_BITS)
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#define MAC_MAX 2048
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/* Time, in seconds, before expiring a mac_entry due to inactivity. */
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#define MAC_ENTRY_IDLE_TIME 60
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/* Time, in seconds, to lock an entry updated by a gratuitous ARP to avoid
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* relearning based on a reflection from a bond slave. */
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#define MAC_GRAT_ARP_LOCK_TIME 5
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/* A MAC learning table entry. */
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struct mac_entry {
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struct list hash_node; /* Element in a mac_learning 'table' list. */
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struct list lru_node; /* Element in 'lrus' or 'free' list. */
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time_t expires; /* Expiration time. */
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time_t grat_arp_lock; /* Gratuitous ARP lock expiration time. */
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uint8_t mac[ETH_ADDR_LEN]; /* Known MAC address. */
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uint16_t vlan; /* VLAN tag. */
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tag_type tag; /* Tag for this learning entry. */
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/* Learned port. */
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union {
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void *p;
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int i;
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} port;
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};
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int mac_entry_age(const struct mac_entry *);
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/* Returns true if mac_learning_insert() just created 'mac' and the caller has
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* not yet properly initialized it. */
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static inline bool mac_entry_is_new(const struct mac_entry *mac)
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{
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return !mac->tag;
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}
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/* Sets a gratuitous ARP lock on 'mac' that will expire in
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* MAC_GRAT_ARP_LOCK_TIME seconds. */
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static inline void mac_entry_set_grat_arp_lock(struct mac_entry *mac)
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{
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mac->grat_arp_lock = time_now() + MAC_GRAT_ARP_LOCK_TIME;
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}
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/* Returns true if a gratuitous ARP lock is in effect on 'mac', false if none
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* has ever been asserted or if it has expired. */
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static inline bool mac_entry_is_grat_arp_locked(const struct mac_entry *mac)
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{
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return time_now() < mac->grat_arp_lock;
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}
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/* MAC learning table. */
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struct mac_learning {
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struct list free; /* Not-in-use entries. */
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struct list lrus; /* In-use entries, least recently used at the
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front, most recently used at the back. */
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struct list table[MAC_HASH_SIZE]; /* Hash table. */
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struct mac_entry entries[MAC_MAX]; /* All entries. */
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uint32_t secret; /* Secret for randomizing hash table. */
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unsigned long *flood_vlans; /* Bitmap of learning disabled VLANs. */
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};
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/* Basics. */
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struct mac_learning *mac_learning_create(void);
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void mac_learning_destroy(struct mac_learning *);
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void mac_learning_run(struct mac_learning *, struct tag_set *);
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void mac_learning_wait(struct mac_learning *);
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/* Configuration. */
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bool mac_learning_set_flood_vlans(struct mac_learning *,
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const unsigned long *bitmap);
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/* Learning. */
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bool mac_learning_may_learn(const struct mac_learning *,
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const uint8_t src_mac[ETH_ADDR_LEN],
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uint16_t vlan);
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struct mac_entry *mac_learning_insert(struct mac_learning *,
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const uint8_t src[ETH_ADDR_LEN],
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uint16_t vlan);
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tag_type mac_learning_changed(struct mac_learning *, struct mac_entry *);
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/* Lookup. */
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struct mac_entry *mac_learning_lookup(const struct mac_learning *,
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const uint8_t dst[ETH_ADDR_LEN],
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uint16_t vlan, tag_type *);
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/* Flushing. */
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void mac_learning_expire(struct mac_learning *, struct mac_entry *);
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void mac_learning_flush(struct mac_learning *);
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#endif /* mac-learning.h */
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