-#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 */
-};
+/* Returns the number of seconds since 'e' was last learned. */
+int
+mac_entry_age(const struct mac_entry *e)
+{
+ time_t remaining = e->expires - time_now();
+ return MAC_ENTRY_IDLE_TIME - remaining;
+}