diff options
| -rw-r--r-- | OvmfPkg/VirtioNetDxe/SnpMcastIpToMac.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/OvmfPkg/VirtioNetDxe/SnpMcastIpToMac.c b/OvmfPkg/VirtioNetDxe/SnpMcastIpToMac.c new file mode 100644 index 0000000000..686fd0db4e --- /dev/null +++ b/OvmfPkg/VirtioNetDxe/SnpMcastIpToMac.c @@ -0,0 +1,108 @@ +/** @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;
+}
|