2 * Copyright (c) 2008, 2009, 2010, 2012 Nicira Networks.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef MAC_LEARNING_H
18 #define MAC_LEARNING_H 1
27 #define MAC_HASH_BITS 10
28 #define MAC_HASH_MASK (MAC_HASH_SIZE - 1)
29 #define MAC_HASH_SIZE (1u << MAC_HASH_BITS)
33 /* Time, in seconds, before expiring a mac_entry due to inactivity. */
34 #define MAC_ENTRY_DEFAULT_IDLE_TIME 300
36 /* Time, in seconds, to lock an entry updated by a gratuitous ARP to avoid
37 * relearning based on a reflection from a bond slave. */
38 #define MAC_GRAT_ARP_LOCK_TIME 5
40 enum grat_arp_lock_type {
46 /* A MAC learning table entry. */
48 struct list hash_node; /* Element in a mac_learning 'table' list. */
49 struct list lru_node; /* Element in 'lrus' or 'free' list. */
50 time_t expires; /* Expiration time. */
51 time_t grat_arp_lock; /* Gratuitous ARP lock expiration time. */
52 uint8_t mac[ETH_ADDR_LEN]; /* Known MAC address. */
53 uint16_t vlan; /* VLAN tag. */
54 int port; /* Port on which MAC was most recently seen. */
55 tag_type tag; /* Tag for this learning entry. */
58 int mac_entry_age(const struct mac_learning *, const struct mac_entry *);
60 /* MAC learning table. */
62 struct list free; /* Not-in-use entries. */
63 struct list lrus; /* In-use entries, least recently used at the
64 front, most recently used at the back. */
65 struct list table[MAC_HASH_SIZE]; /* Hash table. */
66 struct mac_entry entries[MAC_MAX]; /* All entries. */
67 uint32_t secret; /* Secret for randomizing hash table. */
68 unsigned long *flood_vlans; /* Bitmap of learning disabled VLANs. */
69 unsigned int idle_time; /* Max age before deleting an entry. */
72 struct mac_learning *mac_learning_create(unsigned int idle_time);
73 void mac_learning_destroy(struct mac_learning *);
74 bool mac_learning_set_flood_vlans(struct mac_learning *,
75 unsigned long *bitmap);
76 void mac_learning_set_idle_time(struct mac_learning *, unsigned int idle_time);
77 tag_type mac_learning_learn(struct mac_learning *,
78 const uint8_t src[ETH_ADDR_LEN], uint16_t vlan,
79 uint16_t src_port, enum grat_arp_lock_type
81 int mac_learning_lookup(const struct mac_learning *,
82 const uint8_t dst[ETH_ADDR_LEN], uint16_t vlan,
83 bool *is_grat_arp_locked);
84 int mac_learning_lookup_tag(const struct mac_learning *,
85 const uint8_t dst[ETH_ADDR_LEN],
86 uint16_t vlan, tag_type *tag,
87 bool *is_grat_arp_locked);
88 void mac_learning_flush(struct mac_learning *);
89 void mac_learning_run(struct mac_learning *, struct tag_set *);
90 void mac_learning_wait(struct mac_learning *);
92 #endif /* mac-learning.h */