-/* Returns true if a packet with Ethernet destination MAC 'dst' may be mirrored
- * to a VLAN. In general most packets may be mirrored but we want to drop
- * protocols that may confuse switches. */
-static bool
-eth_dst_may_rspan(const uint8_t dst[ETH_ADDR_LEN])
-{
- /* If you change this function's behavior, please update corresponding
- * documentation in vswitch.xml at the same time. */
- if (dst[0] != 0x01) {
- /* All the currently banned MACs happen to start with 01 currently, so
- * this is a quick way to eliminate most of the good ones. */
- } else {
- if (eth_addr_is_reserved(dst)) {
- /* Drop STP, IEEE pause frames, and other reserved protocols
- * (01-80-c2-00-00-0x). */
- return false;
- }
-
- if (dst[0] == 0x01 && dst[1] == 0x00 && dst[2] == 0x0c) {
- /* Cisco OUI. */
- if ((dst[3] & 0xfe) == 0xcc &&
- (dst[4] & 0xfe) == 0xcc &&
- (dst[5] & 0xfe) == 0xcc) {
- /* Drop the following protocols plus others following the same
- pattern:
-
- CDP, VTP, DTP, PAgP (01-00-0c-cc-cc-cc)
- Spanning Tree PVSTP+ (01-00-0c-cc-cc-cd)
- STP Uplink Fast (01-00-0c-cd-cd-cd) */
- return false;
- }
-
- if (!(dst[3] | dst[4] | dst[5])) {
- /* Drop Inter Switch Link packets (01-00-0c-00-00-00). */
- return false;
- }
- }
- }
- return true;
-}
-