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Cedar/IPC: Fix MAC address for IPv4 multicast

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This commit is contained in:
domosekai 2021-04-24 01:46:31 +00:00
parent 19af52e288
commit cca769e2e6
1 changed files with 15 additions and 1 deletions
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16
src/Cedar/IPC.c
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@ -1684,7 +1684,21 @@ void IPCSendIPv4(IPC *ipc, void *data, UINT size)
else if (ipv4[0] >= 224 && ipv4[0] <= 239)
{
// IPv4 Multicast
is_broadcast = true;
UCHAR dest[6];
// Per RFC 1112, multicast MAC address has the form 01-00-5E-00-00-00,
// where the lowest 23 bits are copied from the destination IP address.
dest[0] = 0x01;
dest[1] = 0x00;
dest[2] = 0x5e;
dest[3] = 0x7f & ipv4[1];
dest[4] = ipv4[2];
dest[5] = ipv4[3];
// Send
IPCSendIPv4WithDestMacAddr(ipc, data, size, dest);
return;
}
}