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mirroring: Allow learning to be disabled on a VLAN.

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RSPAN does not work properly unless MAC learning for the VLAN is
disabled on all switches between the origin and monitoring point.
This allows learning to be disabled on a given VLAN so vSwitch can
acts as an intermediate switch.

Feature #2136
This commit is contained in:
Jesse Gross
2009-11-06 17:13:51 -08:00
parent 93dfc06772
commit f2d7fd66cf
4 changed files with 65 additions and 4 deletions
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35
lib/mac-learning.c
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@@ -21,6 +21,7 @@
#include <inttypes.h>
#include <stdlib.h>
#include "bitmap.h"
#include "coverage.h"
#include "hash.h"
#include "list.h"
@@ -129,6 +130,7 @@ mac_learning_create(void)
list_push_front(&ml->free, &s->lru_node);
}
ml->secret = random_uint32();
ml->non_learning_vlans = NULL;
return ml;
}
@@ -136,9 +138,36 @@ mac_learning_create(void)
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'.
*
@@ -156,6 +185,10 @@ mac_learning_learn(struct mac_learning *ml,
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,
@@ -216,7 +249,7 @@ mac_learning_lookup_tag(const struct mac_learning *ml,
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),