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
VirtioNetMcastIpToMac(IN EFI_SIMPLE_NETWORK_PROTOCOL * This,IN BOOLEAN IPv6,IN EFI_IP_ADDRESS * Ip,OUT EFI_MAC_ADDRESS * Mac)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