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/** @file
Implementation of the SNP.McastIpToMac() function and its private helpers if
any.
Copyright (C) 2013, Red Hat, Inc.
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/UefiBootServicesTableLib.h>
#include "VirtioNet.h"
/**
Converts a multicast IP address to a multicast HW MAC address.
@param This The protocol instance pointer.
@param IPv6 Set to TRUE if the multicast IP address is IPv6 [RFC 2460]. Set
to FALSE if the multicast IP address is IPv4 [RFC 791].
@param IP The multicast IP address that is to be converted to a multicast
HW MAC address.
@param MAC The multicast HW MAC address that is to be generated from IP.
@retval EFI_SUCCESS The multicast IP address was mapped to the
multicast HW MAC address.
@retval EFI_NOT_STARTED The network interface has not been started.
@retval EFI_BUFFER_TOO_SMALL The Statistics buffer was too small. The
current buffer size needed to hold the
statistics is returned in StatisticsSize.
@retval EFI_INVALID_PARAMETER One or more of the parameters has an
unsupported value.
@retval EFI_DEVICE_ERROR The command could not be sent to the network
interface.
@retval EFI_UNSUPPORTED This function is not supported by the network
interface.
**/
EFI_STATUS
EFIAPI
VirtioNetMcastIpToMac (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
IN BOOLEAN IPv6,
IN EFI_IP_ADDRESS *Ip,
OUT EFI_MAC_ADDRESS *Mac
)
{
VNET_DEV *Dev;
EFI_TPL OldTpl;
EFI_STATUS Status;
//
// http://en.wikipedia.org/wiki/Multicast_address
//
if (This == NULL || Ip == NULL || Mac == NULL ||
( IPv6 && (Ip->v6.Addr[0] ) != 0xFF) || // invalid IPv6 mcast addr
(!IPv6 && (Ip->v4.Addr[0] & 0xF0) != 0xE0) // invalid IPv4 mcast addr
) {
return EFI_INVALID_PARAMETER;
}
Dev = VIRTIO_NET_FROM_SNP (This);
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
switch (Dev->Snm.State) {
case EfiSimpleNetworkStopped:
Status = EFI_NOT_STARTED;
goto Exit;
case EfiSimpleNetworkStarted:
Status = EFI_DEVICE_ERROR;
goto Exit;
default:
break;
}
//
// http://en.wikipedia.org/wiki/IP_multicast#Layer_2_delivery
//
if (IPv6) {
Mac->Addr[0] = 0x33;
Mac->Addr[1] = 0x33;
Mac->Addr[2] = Ip->v6.Addr[12];
Mac->Addr[3] = Ip->v6.Addr[13];
Mac->Addr[4] = Ip->v6.Addr[14];
Mac->Addr[5] = Ip->v6.Addr[15];
}
else {
Mac->Addr[0] = 0x01;
Mac->Addr[1] = 0x00;
Mac->Addr[2] = 0x5E;
Mac->Addr[3] = Ip->v4.Addr[1] & 0x7F;
Mac->Addr[4] = Ip->v4.Addr[2];
Mac->Addr[5] = Ip->v4.Addr[3];
}
Status = EFI_SUCCESS;
Exit:
gBS->RestoreTPL (OldTpl);
return Status;
}
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