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OvmfPkg: VirtioNetDxe: map multicast IP to MAC: SNP.McastIpToMac

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Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14414 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Laszlo Ersek 2013-06-14 07:40:30 +00:00 committed by jljusten
parent b6dfc654c8
commit f8ec2cc52c
1 changed files with 108 additions and 0 deletions
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108
OvmfPkg/VirtioNetDxe/SnpMcastIpToMac.c Normal file
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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>
This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License which accompanies this
distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#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;
}