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nvnet: Accept only broadcast and targeted traffic, not multicast 

Fixes XNET warnings when using Debug XDK libraries
This commit is contained in:
Luke Usher 2019-12-14 11:25:35 +00:00
parent 63bc65ece2
commit d1018cb773
1 changed files with 2 additions and 4 deletions
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6
src/devices/EmuNVNet.cpp
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@ -711,11 +711,9 @@ size_t NVNetDevice::PCAPReceive(void* packet, size_t max_length)
const uint8_t *pkt_data;
if (int res = pcap_next_ex((pcap_t*)m_AdapterHandle, &header, &pkt_data) > 0) {
// Only forward packets that are multicast or specifically for Cxbx-R's MAC
// Multicast is defined as packets with the least significant bit of the first octet set to 1.
// Since broadcast packets have all bits set to 1, this matches those too.
// Only forward packets that are broadcast or specifically for Cxbx-R's MAC
ethernet_header* e_header = (ethernet_header*)pkt_data;
if (memcmp(e_header->dst.bytes, m_GuestMacAddress.bytes, 6) == 0 || (e_header->dst.bytes[0] & 1)) {
if (memcmp(e_header->dst.bytes, m_GuestMacAddress.bytes, 6) == 0 || memcmp(e_header->dst.bytes, m_BroadcastMacAddress.bytes, 6) == 0) {
memcpy(packet, pkt_data, header->len);
return header->len;
}