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efi_loader: implement MCastIPtoMAC

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Implement the MCastIPtoMAC service of the simple network protocol.
It converts an multicast IPv4 (or IPv6) address to a multicast Ethernet
address.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt
2019-09-01 17:17:53 +02:00
parent 72a8f1685a
commit 5b4746fd6b
1 changed files with 42 additions and 2 deletions
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44
lib/efi_loader/efi_net.c
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@@ -332,7 +332,7 @@ static efi_status_t EFIAPI efi_net_statistics(struct efi_simple_network *this,
/* /*
* efi_net_mcastiptomac() - translate multicast IP address to MAC address * efi_net_mcastiptomac() - translate multicast IP address to MAC address
* *
* This function implements the Statistics service of the * This function implements the MCastIPtoMAC service of the
* EFI_SIMPLE_NETWORK_PROTOCOL. See the Unified Extensible Firmware Interface * EFI_SIMPLE_NETWORK_PROTOCOL. See the Unified Extensible Firmware Interface
* (UEFI) specification for details. * (UEFI) specification for details.
* *
@@ -347,9 +347,49 @@ static efi_status_t EFIAPI efi_net_mcastiptomac(struct efi_simple_network *this,
struct efi_ip_address *ip, struct efi_ip_address *ip,
struct efi_mac_address *mac) struct efi_mac_address *mac)
{ {
efi_status_t ret = EFI_SUCCESS;
EFI_ENTRY("%p, %x, %p, %p", this, ipv6, ip, mac); EFI_ENTRY("%p, %x, %p, %p", this, ipv6, ip, mac);
return EFI_EXIT(EFI_INVALID_PARAMETER); if (!this || !ip || !mac) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
if (ipv6) {
ret = EFI_UNSUPPORTED;
goto out;
}
/* Multi-cast addresses are in the range 224.0.0.0 - 239.255.255.255 */
if ((ip->ip_addr[0] & 0xf0) != 0xe0) {
ret = EFI_INVALID_PARAMETER;
goto out;
};
switch (this->mode->state) {
case EFI_NETWORK_INITIALIZED:
case EFI_NETWORK_STARTED:
break;
default:
ret = EFI_NOT_STARTED;
goto out;
}
memset(mac, 0, sizeof(struct efi_mac_address));
/*
* Copy lower 23 bits of IPv4 multi-cast address
* RFC 1112, RFC 7042 2.1.1.
*/
mac->mac_addr[0] = 0x01;
mac->mac_addr[1] = 0x00;
mac->mac_addr[2] = 0x5E;
mac->mac_addr[3] = ip->ip_addr[1] & 0x7F;
mac->mac_addr[4] = ip->ip_addr[2];
mac->mac_addr[5] = ip->ip_addr[3];
out:
return EFI_EXIT(ret);
} }
/** /**