| 1 | /** @file
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| 2 |
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| 3 | Implementation of the SNP.McastIpToMac() function and its private helpers if
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| 4 | any.
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| 5 |
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| 6 | Copyright (C) 2013, Red Hat, Inc.
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| 7 | Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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| 8 |
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| 9 | SPDX-License-Identifier: BSD-2-Clause-Patent
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| 10 |
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| 11 | **/
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| 12 |
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| 13 | #include <Library/UefiBootServicesTableLib.h>
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| 14 |
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| 15 | #include "VirtioNet.h"
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| 16 |
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| 17 | /**
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| 18 | Converts a multicast IP address to a multicast HW MAC address.
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| 19 |
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| 20 | @param This The protocol instance pointer.
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| 21 | @param IPv6 Set to TRUE if the multicast IP address is IPv6 [RFC 2460]. Set
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| 22 | to FALSE if the multicast IP address is IPv4 [RFC 791].
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| 23 | @param IP The multicast IP address that is to be converted to a multicast
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| 24 | HW MAC address.
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| 25 | @param MAC The multicast HW MAC address that is to be generated from IP.
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| 26 |
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| 27 | @retval EFI_SUCCESS The multicast IP address was mapped to the
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| 28 | multicast HW MAC address.
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| 29 | @retval EFI_NOT_STARTED The network interface has not been started.
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| 30 | @retval EFI_BUFFER_TOO_SMALL The Statistics buffer was too small. The
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| 31 | current buffer size needed to hold the
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| 32 | statistics is returned in StatisticsSize.
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| 33 | @retval EFI_INVALID_PARAMETER One or more of the parameters has an
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| 34 | unsupported value.
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| 35 | @retval EFI_DEVICE_ERROR The command could not be sent to the network
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| 36 | interface.
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| 37 | @retval EFI_UNSUPPORTED This function is not supported by the network
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| 38 | interface.
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| 39 |
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| 40 | **/
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| 41 | EFI_STATUS
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| 42 | EFIAPI
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| 43 | VirtioNetMcastIpToMac (
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| 44 | IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
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| 45 | IN BOOLEAN IPv6,
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| 46 | IN EFI_IP_ADDRESS *Ip,
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| 47 | OUT EFI_MAC_ADDRESS *Mac
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| 48 | )
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| 49 | {
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| 50 | VNET_DEV *Dev;
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| 51 | EFI_TPL OldTpl;
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| 52 | EFI_STATUS Status;
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| 53 |
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| 54 | //
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| 55 | // http://en.wikipedia.org/wiki/Multicast_address
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| 56 | //
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| 57 | if ((This == NULL) || (Ip == NULL) || (Mac == NULL) ||
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| 58 | (IPv6 && ((Ip->v6.Addr[0]) != 0xFF)) || // invalid IPv6 mcast addr
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| 59 | (!IPv6 && ((Ip->v4.Addr[0] & 0xF0) != 0xE0)) // invalid IPv4 mcast addr
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| 60 | )
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| 61 | {
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| 62 | return EFI_INVALID_PARAMETER;
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| 63 | }
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| 64 |
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| 65 | Dev = VIRTIO_NET_FROM_SNP (This);
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| 66 | OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
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| 67 | switch (Dev->Snm.State) {
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| 68 | case EfiSimpleNetworkStopped:
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| 69 | Status = EFI_NOT_STARTED;
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| 70 | goto Exit;
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| 71 | case EfiSimpleNetworkStarted:
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| 72 | Status = EFI_DEVICE_ERROR;
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| 73 | goto Exit;
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| 74 | default:
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| 75 | break;
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| 76 | }
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| 77 |
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| 78 | //
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| 79 | // http://en.wikipedia.org/wiki/IP_multicast#Layer_2_delivery
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| 80 | //
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| 81 | if (IPv6) {
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| 82 | Mac->Addr[0] = 0x33;
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| 83 | Mac->Addr[1] = 0x33;
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| 84 | Mac->Addr[2] = Ip->v6.Addr[12];
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| 85 | Mac->Addr[3] = Ip->v6.Addr[13];
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| 86 | Mac->Addr[4] = Ip->v6.Addr[14];
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| 87 | Mac->Addr[5] = Ip->v6.Addr[15];
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| 88 | } else {
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| 89 | Mac->Addr[0] = 0x01;
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| 90 | Mac->Addr[1] = 0x00;
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| 91 | Mac->Addr[2] = 0x5E;
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| 92 | Mac->Addr[3] = Ip->v4.Addr[1] & 0x7F;
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| 93 | Mac->Addr[4] = Ip->v4.Addr[2];
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| 94 | Mac->Addr[5] = Ip->v4.Addr[3];
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| 95 | }
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| 96 |
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| 97 | Status = EFI_SUCCESS;
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| 98 |
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| 99 | Exit:
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| 100 | gBS->RestoreTPL (OldTpl);
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| 101 | return Status;
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| 102 | }
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