#include <inttypes.h>
#include <stdlib.h>
+#include "bitmap.h"
#include "coverage.h"
#include "hash.h"
#include "list.h"
#define THIS_MODULE VLM_mac_learning
#include "vlog.h"
+/* 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;
+}
+
static uint32_t
mac_table_hash(const uint8_t mac[ETH_ADDR_LEN], uint16_t vlan)
{
list_push_front(&ml->free, &s->lru_node);
}
ml->secret = random_uint32();
+ ml->non_learning_vlans = NULL;
return ml;
}
void
mac_learning_destroy(struct mac_learning *ml)
{
+ if (ml) {
+ bitmap_free(ml->non_learning_vlans);
+ }
free(ml);
}
+/* Provides a bitmap of VLANs which have learning disabled. It takes
+ * ownership of the bitmap. Returns true if the set has changed from
+ * the previous value. */
+bool
+mac_learning_set_disabled_vlans(struct mac_learning *ml, unsigned long *bitmap)
+{
+ bool ret = (bitmap == NULL
+ ? ml->non_learning_vlans != NULL
+ : (ml->non_learning_vlans == NULL
+ || !bitmap_equal(bitmap, ml->non_learning_vlans, 4096)));
+
+ bitmap_free(ml->non_learning_vlans);
+ ml->non_learning_vlans = bitmap;
+
+ return ret;
+}
+
+static bool
+is_learning_vlan(const struct mac_learning *ml, uint16_t vlan)
+{
+ return !(ml->non_learning_vlans
+ && bitmap_is_set(ml->non_learning_vlans, vlan));
+}
+
/* Attempts to make 'ml' learn from the fact that a frame from 'src_mac' was
* just observed arriving from 'src_port' on the given 'vlan'.
*
struct mac_entry *e;
struct list *bucket;
+ if (!is_learning_vlan(ml, vlan)) {
+ return 0;
+ }
+
if (eth_addr_is_multicast(src_mac)) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(30, 30);
VLOG_DBG_RL(&rl, "multicast packet source "ETH_ADDR_FMT,
/* Make the entry most-recently-used. */
list_remove(&e->lru_node);
list_push_back(&ml->lrus, &e->lru_node);
- e->expires = time_now() + 60;
+ e->expires = time_now() + MAC_ENTRY_IDLE_TIME;
/* Did we learn something? */
if (e->port != src_port) {
const uint8_t dst[ETH_ADDR_LEN], uint16_t vlan,
tag_type *tag)
{
- if (eth_addr_is_multicast(dst)) {
+ if (eth_addr_is_multicast(dst) || !is_learning_vlan(ml, vlan)) {
return -1;
} else {
struct mac_entry *e = search_bucket(mac_table_bucket(ml, dst, vlan),