1 /** @file 2 3 Implementation of the SNP.McastIpToMac() function and its private helpers if 4 any. 5 6 Copyright (C) 2013, Red Hat, Inc. 7 Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR> 8 9 This program and the accompanying materials are licensed and made available 10 under the terms and conditions of the BSD License which accompanies this 11 distribution. The full text of the license may be found at 12 http://opensource.org/licenses/bsd-license.php 13 14 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT 15 WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 16 17 **/ 18 19 #include <Library/UefiBootServicesTableLib.h> 20 21 #include "VirtioNet.h" 22 23 /** 24 Converts a multicast IP address to a multicast HW MAC address. 25 26 @param This The protocol instance pointer. 27 @param IPv6 Set to TRUE if the multicast IP address is IPv6 [RFC 2460]. Set 28 to FALSE if the multicast IP address is IPv4 [RFC 791]. 29 @param IP The multicast IP address that is to be converted to a multicast 30 HW MAC address. 31 @param MAC The multicast HW MAC address that is to be generated from IP. 32 33 @retval EFI_SUCCESS The multicast IP address was mapped to the 34 multicast HW MAC address. 35 @retval EFI_NOT_STARTED The network interface has not been started. 36 @retval EFI_BUFFER_TOO_SMALL The Statistics buffer was too small. The 37 current buffer size needed to hold the 38 statistics is returned in StatisticsSize. 39 @retval EFI_INVALID_PARAMETER One or more of the parameters has an 40 unsupported value. 41 @retval EFI_DEVICE_ERROR The command could not be sent to the network 42 interface. 43 @retval EFI_UNSUPPORTED This function is not supported by the network 44 interface. 45 46 **/ 47 48 EFI_STATUS 49 EFIAPI 50 VirtioNetMcastIpToMac ( 51 IN EFI_SIMPLE_NETWORK_PROTOCOL *This, 52 IN BOOLEAN IPv6, 53 IN EFI_IP_ADDRESS *Ip, 54 OUT EFI_MAC_ADDRESS *Mac 55 ) 56 { 57 VNET_DEV *Dev; 58 EFI_TPL OldTpl; 59 EFI_STATUS Status; 60 61 // 62 // http://en.wikipedia.org/wiki/Multicast_address 63 // 64 if (This == NULL || Ip == NULL || Mac == NULL || 65 ( IPv6 && (Ip->v6.Addr[0] ) != 0xFF) || // invalid IPv6 mcast addr 66 (!IPv6 && (Ip->v4.Addr[0] & 0xF0) != 0xE0) // invalid IPv4 mcast addr 67 ) { 68 return EFI_INVALID_PARAMETER; 69 } 70 71 Dev = VIRTIO_NET_FROM_SNP (This); 72 OldTpl = gBS->RaiseTPL (TPL_CALLBACK); 73 switch (Dev->Snm.State) { 74 case EfiSimpleNetworkStopped: 75 Status = EFI_NOT_STARTED; 76 goto Exit; 77 case EfiSimpleNetworkStarted: 78 Status = EFI_DEVICE_ERROR; 79 goto Exit; 80 default: 81 break; 82 } 83 84 // 85 // http://en.wikipedia.org/wiki/IP_multicast#Layer_2_delivery 86 // 87 if (IPv6) { 88 Mac->Addr[0] = 0x33; 89 Mac->Addr[1] = 0x33; 90 Mac->Addr[2] = Ip->v6.Addr[12]; 91 Mac->Addr[3] = Ip->v6.Addr[13]; 92 Mac->Addr[4] = Ip->v6.Addr[14]; 93 Mac->Addr[5] = Ip->v6.Addr[15]; 94 } 95 else { 96 Mac->Addr[0] = 0x01; 97 Mac->Addr[1] = 0x00; 98 Mac->Addr[2] = 0x5E; 99 Mac->Addr[3] = Ip->v4.Addr[1] & 0x7F; 100 Mac->Addr[4] = Ip->v4.Addr[2]; 101 Mac->Addr[5] = Ip->v4.Addr[3]; 102 } 103 Status = EFI_SUCCESS; 104 105 Exit: 106 gBS->RestoreTPL (OldTpl); 107 return Status; 108 } 109
