diff options
Diffstat (limited to 'MdeModulePkg/Universal/Network/PxeDhcp4Dxe/PxeDhcp4Release.c')
| -rw-r--r-- | MdeModulePkg/Universal/Network/PxeDhcp4Dxe/PxeDhcp4Release.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/Network/PxeDhcp4Dxe/PxeDhcp4Release.c b/MdeModulePkg/Universal/Network/PxeDhcp4Dxe/PxeDhcp4Release.c new file mode 100644 index 0000000000..119acffceb --- /dev/null +++ b/MdeModulePkg/Universal/Network/PxeDhcp4Dxe/PxeDhcp4Release.c @@ -0,0 +1,247 @@ +/** @file
+
+Copyright (c) 2004, Intel Corporation
+All rights reserved. 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.
+
+Module Name:
+ PxeDhcp4Release.c
+
+Abstract:
+ Transmit release packet, free allocations and shutdown PxeDhcp4.
+
+
+**/
+
+
+#include "PxeDhcp4.h"
+
+/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
+EFI_STATUS
+EFIAPI
+PxeDhcp4Release (
+ IN EFI_PXE_DHCP4_PROTOCOL *This
+ )
+{
+ PXE_DHCP4_PRIVATE_DATA *Private;
+ EFI_IP_ADDRESS ServerIp;
+ EFI_IP_ADDRESS client_ip;
+ EFI_IP_ADDRESS gateway_ip;
+ EFI_IP_ADDRESS subnet_mask;
+ EFI_STATUS efi_status;
+ DHCP4_OP *op;
+ UINT8 op_list[20];
+
+ //
+ // Check for invalid parameters.
+ //
+ if (This == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+ //
+ // Release does nothing if the protocol has never been setup.
+ //
+ if (This->Data == NULL) {
+ return EFI_NOT_STARTED;
+ }
+ //
+ // Fail if we do not have valid instance data.
+ //
+ Private = PXE_DHCP4_PRIVATE_DATA_FROM_THIS (This);
+
+ if (Private == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if (Private->PxeBc == NULL) {
+ return EFI_DEVICE_ERROR;
+ }
+ //
+ // If this is a BOOTP session and there is not a DHCP Ack
+ // packet, just release storage and return.
+ //
+ if (This->Data->IsBootp || !This->Data->IsAck) {
+ gBS->FreePool (This->Data);
+ This->Data = NULL;
+
+ if (Private->StopPxeBc) {
+ Private->PxeBc->Stop (Private->PxeBc);
+ }
+
+ return EFI_SUCCESS;
+ }
+ //
+ // Build option list for DHCP Release packet.
+ // If any errors occur, just release storage and return.
+ //
+ //
+ // Message type is first.
+ //
+ op_list[0] = DHCP4_MESSAGE_TYPE;
+ op_list[1] = 1;
+ op_list[2] = DHCP4_MESSAGE_TYPE_RELEASE;
+
+ //
+ // Followed by server identifier.
+ //
+ efi_status = find_opt (
+ &This->Data->Request,
+ DHCP4_SERVER_IDENTIFIER,
+ 0,
+ &op
+ );
+
+ if (EFI_ERROR (efi_status)) {
+ gBS->FreePool (This->Data);
+ This->Data = NULL;
+
+ if (Private->StopPxeBc) {
+ Private->PxeBc->Stop (Private->PxeBc);
+ }
+
+ return EFI_SUCCESS;
+ }
+
+ if (op->len != 4) {
+ gBS->FreePool (This->Data);
+ This->Data = NULL;
+
+ if (Private->StopPxeBc) {
+ Private->PxeBc->Stop (Private->PxeBc);
+ }
+
+ return EFI_SUCCESS;
+ }
+
+ CopyMem (&ServerIp, op->data, 4);
+
+ op_list[3] = DHCP4_SERVER_IDENTIFIER;
+ op_list[4] = 4;
+ CopyMem (&op_list[5], &ServerIp, 4);
+
+ //
+ // Followed by end.
+ //
+ op_list[9] = DHCP4_END;
+
+ //
+ // We need a subnet mask for IP stack operation.
+ //
+ efi_status = find_opt (
+ &This->Data->AckNak,
+ DHCP4_SUBNET_MASK,
+ 0,
+ &op
+ );
+
+ if (EFI_ERROR (efi_status)) {
+ gBS->FreePool (This->Data);
+ This->Data = NULL;
+
+ if (Private->StopPxeBc) {
+ Private->PxeBc->Stop (Private->PxeBc);
+ }
+
+ return EFI_SUCCESS;
+ }
+
+ if (op->len != 4) {
+ gBS->FreePool (This->Data);
+ This->Data = NULL;
+
+ if (Private->StopPxeBc) {
+ Private->PxeBc->Stop (Private->PxeBc);
+ }
+
+ return EFI_SUCCESS;
+ }
+
+ ZeroMem (&subnet_mask, sizeof (EFI_IP_ADDRESS));
+ CopyMem (&subnet_mask, op->data, 4);
+
+ //
+ // Gateway IP address may be needed.
+ //
+ ZeroMem (&gateway_ip, sizeof (EFI_IP_ADDRESS));
+ CopyMem (&gateway_ip, &This->Data->AckNak.dhcp4.giaddr, 4);
+
+ //
+ // Client IP address needed for IP stack operation.
+ //
+ ZeroMem (&client_ip, sizeof (EFI_IP_ADDRESS));
+ CopyMem (&client_ip, &This->Data->AckNak.dhcp4.yiaddr, 4);
+
+ //
+ // Enable UDP...
+ //
+ efi_status = start_udp (Private, &client_ip, &subnet_mask);
+
+ if (EFI_ERROR (efi_status)) {
+ gBS->FreePool (This->Data);
+ This->Data = NULL;
+
+ if (Private->StopPxeBc) {
+ Private->PxeBc->Stop (Private->PxeBc);
+ }
+
+ return efi_status;
+ }
+ //
+ // Gather information out of DHCP request packet needed for
+ // DHCP release packet.
+ //
+ //
+ // Setup DHCP Release packet.
+ //
+ CopyMem (&This->Data->Request.dhcp4.ciaddr, &client_ip, 4);
+
+ ZeroMem (&This->Data->Request.dhcp4.yiaddr, 12);
+
+ ZeroMem (&This->Data->Request.dhcp4.sname, 64 + 128);
+
+ This->Data->Request.dhcp4.hops = 0;
+ This->Data->Request.dhcp4.secs = 0;
+ This->Data->Request.dhcp4.flags = 0;
+
+ ZeroMem (
+ &This->Data->Request.dhcp4.options,
+ sizeof This->Data->Request.dhcp4.options
+ );
+
+ CopyMem (&This->Data->Request.dhcp4.options, op_list, 10);
+
+ //
+ // Transmit DHCP Release packet.
+ //
+ tx_udp (
+ Private,
+ &ServerIp,
+ &gateway_ip,
+ &client_ip,
+ &This->Data->Request,
+ DHCP4_MAX_PACKET_SIZE - (DHCP4_UDP_HEADER_SIZE + DHCP4_IP_HEADER_SIZE)
+ );
+
+ gBS->Stall (1000000); /* 1/10th second */
+
+ //
+ // Shutdown PXE BaseCode and release local storage.
+ //
+ stop_udp (Private);
+
+ gBS->FreePool (This->Data);
+ This->Data = NULL;
+
+ if (Private->StopPxeBc) {
+ Private->PxeBc->Stop (Private->PxeBc);
+ }
+
+ return EFI_SUCCESS;
+}
+
+/* eof - PxeDhcp4Release.c */
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