4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Mtftp6 Rrq process functions implementation.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved.<BR>
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync This program and the accompanying materials
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync are licensed and made available under the terms and conditions of the BSD License
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync which accompanies this distribution. The full text of the license may be found at
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Build and send a ACK packet for download.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Instance The pointer to the Mtftp6 instance.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] BlockNum The block number to be acked.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_OUT_OF_RESOURCES Failed to allocate memory for the packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_SUCCESS The ACK has been sent.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval Others Failed to send the ACK.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Allocate net buffer to create ack packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Packet = NetbufAlloc (sizeof (EFI_MTFTP6_ACK_HEADER));
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Reset current retry count of the instance.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Deliver the received data block to the user, which can be saved
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync in the user provide buffer or through the CheckPacket callback.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Instance The pointer to the Mtftp6 instance.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Packet The pointer to the received packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Len The packet length.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[out] UdpPacket The net buf of the received packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_SUCCESS The data was saved successfully.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_ABORTED The user tells to abort by return an error through
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync CheckPacket.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_BUFFER_TOO_SMALL The user's buffer is too small, and buffer length is
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync updated to the actual buffer size needed.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // This is the last block, save the block num
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Remove this block number from the file hole. If Mtftp6RemoveBlockNum
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // returns EFI_NOT_FOUND, the block has been saved, don't save it again.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Note that : For bigger files, allowing the block counter to roll over
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // to accept transfers of unlimited size. So TotalBlock is memorised as
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // continuous block counter.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Status = Mtftp6RemoveBlockNum (&Instance->BlkList, Block, Completed, &TotalBlock);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Callback to the check packet routine with the received packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Status = Token->CheckPacket (&Instance->Mtftp6, Token, (UINT16) Len, Packet);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Free the received packet before send new packet in ReceiveNotify,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // since the Udp6Io might need to be reconfigured.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Send the Mtftp6 error message if user aborted the current session.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Start = MultU64x32 (TotalBlock - 1, Instance->BlkSize);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync CopyMem ((UINT8 *) Token->Buffer + Start, Packet->Data.Data, DataLen);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Update the file size when received the last block
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Don't save the data if the buffer is too small, return
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // EFI_BUFFER_TOO_SMALL if received the last packet. This
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // will give a accurate file length.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Free the received packet before send new packet in ReceiveNotify,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // since the udpio might need to be reconfigured.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Send the Mtftp6 error message if no enough buffer.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync (UINT8 *) "User provided memory block is too small"
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Process the received data packets. It will save the block
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync then send back an ACK if it is active.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Instance The pointer to the Mtftp6 instance.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Packet The pointer to the received packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Len The length of the packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[out] UdpPacket The net buf of received packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[out] IsCompleted If TRUE, the download has been completed.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Otherwise, the download has not been completed.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_SUCCESS The data packet was successfully processed.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_ABORTED The download was aborted by the user.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_BUFFER_TOO_SMALL The user-provided buffer is too small.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Expected = Mtftp6GetNextBlockNum (&Instance->BlkList);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // If we are active and received an unexpected packet, retransmit
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // the last ACK then restart receiving. If we are passive, save
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // the block.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (Instance->IsMaster && (Expected != BlockNum)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Free the received packet before send new packet in ReceiveNotify,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // since the udpio might need to be reconfigured.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Mtftp6TransmitPacket (Instance, Instance->LastPacket);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Status = Mtftp6RrqSaveBlock (Instance, Packet, Len, UdpPacket);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Reset the passive client's timer whenever it received a valid data packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Check whether we have received all the blocks. Send the ACK if we
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // are active (unicast client or master client for multicast download).
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // If we have received all the blocks, send an ACK even if we are passive
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // to tell the server that we are done.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Expected = Mtftp6GetNextBlockNum (&Instance->BlkList);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // If we are passive client, then the just received Block maybe
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // isn't the last block. We need to send an ACK to the last block
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // to inform the server that we are done. If we are active client,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // the Block == Instance->LastBlock.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Free the received packet before send new packet in ReceiveNotify,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // since the udpio might need to be reconfigured.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Validate whether the options received in the server's OACK packet is valid.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync The options are valid only if:
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync 1. The server doesn't include options not requested by us.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync 2. The server can only use smaller blksize than that is requested.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync 3. The server can only use the same timeout as requested.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync 4. The server doesn't change its multicast channel.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Instance The pointer to the Mtftp6 instance.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] ReplyInfo The pointer to options information in reply packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] RequestInfo The pointer to requested options info.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval TRUE If the option in the OACK is valid.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval FALSE If the option is invalid.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // It is invalid for server to return options we don't request
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if ((ReplyInfo->BitMap & ~RequestInfo->BitMap) != 0) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Server can only specify a smaller block size to be used and
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // return the timeout matches that requested.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if ((((ReplyInfo->BitMap & MTFTP6_OPT_BLKSIZE_BIT) != 0) && (ReplyInfo->BlkSize > RequestInfo->BlkSize)) ||
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync (((ReplyInfo->BitMap & MTFTP6_OPT_TIMEOUT_BIT) != 0) && (ReplyInfo->Timeout != RequestInfo->Timeout))
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // The server can send ",,master" to client to change its master
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // setting. But if it use the specific multicast channel, it can't
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // change the setting.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (((ReplyInfo->BitMap & MTFTP6_OPT_MCAST_BIT) != 0) && !NetIp6IsUnspecifiedAddr (&Instance->McastIp)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (!NetIp6IsUnspecifiedAddr (&ReplyInfo->McastIp) && CompareMem (
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if ((ReplyInfo->McastPort != 0) && (ReplyInfo->McastPort != Instance->McastPort)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Configure Udp6Io to receive a packet from a multicast address.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] McastIo The pointer to the mcast Udp6Io.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Context The pointer to the context.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_SUCCESS The mcast Udp6Io was successfully configured.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval Others Failed to configure the Udp6Io.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Set the configure data for the mcast Udp6Io.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Configure the mcast Udp6Io.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Join the multicast group
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync CopyMem (&Group, &Instance->McastIp, sizeof (EFI_IPv6_ADDRESS));
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Process the OACK packet for Rrq.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Instance The pointer to the Mtftp6 instance.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Packet The pointer to the received packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Len The length of the packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[out] UdpPacket The net buf of received packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[out] IsCompleted If TRUE, the download has been completed.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Otherwise, the download has not been completed.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_DEVICE_ERROR Failed to create/start a multicast Udp6 child.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_TFTP_ERROR An error happened during the process.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_SUCCESS The OACK packet successfully processed.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // If already started the master download, don't change the
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // setting. Master download always succeeds.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Expected = Mtftp6GetNextBlockNum (&Instance->BlkList);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync ZeroMem (&ExtInfo, sizeof (MTFTP6_EXT_OPTION_INFO));
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Parse the options in the packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Status = Mtftp6ParseStart (Packet, Len, &Count, &Options);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Parse the extensive options in the packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Status = Mtftp6ParseExtensionOption (Options, Count, FALSE, &ExtInfo);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (EFI_ERROR (Status) || !Mtftp6RrqOackValid (Instance, &ExtInfo, &Instance->ExtInfo)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Don't send an ERROR packet if the error is EFI_OUT_OF_RESOURCES.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Free the received packet before send new packet in ReceiveNotify,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // since the udpio might need to be reconfigured.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Send the Mtftp6 error message if invalid packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if ((ExtInfo.BitMap & MTFTP6_OPT_MCAST_BIT) != 0) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Save the multicast info. Always update the Master, only update the
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // multicast IP address, block size, timeoute at the first time. If IP
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // address is updated, create a UDP child to receive the multicast.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (NetIp6IsUnspecifiedAddr (&Instance->McastIp)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (NetIp6IsUnspecifiedAddr (&ExtInfo.McastIp) || ExtInfo.McastPort == 0) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Free the received packet before send new packet in ReceiveNotify,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // since the udpio might need to be reconfigured.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Send the Mtftp6 error message if invalid multi-cast setting.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Create a UDP child then start receive the multicast from it.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Free the received packet before send new packet in ReceiveNotify,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // since the udpio might need to be reconfigured.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Send the Mtftp6 error message if failed to create Udp6Io to receive.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync (UINT8 *) "Failed to create socket to receive multicast packet"
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Update the parameters used.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Free the received packet before send new packet in ReceiveNotify,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // since the udpio might need to be reconfigured.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Send an ACK to (Expected - 1) which is 0 for unicast download,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // or tell the server we want to receive the Expected block.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync return Mtftp6RrqSendAck (Instance, (UINT16) (Expected - 1));
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync The packet process callback for Mtftp6 download.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] UdpPacket The pointer to the packet received.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] UdpEpt The pointer to the Udp6 access point.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] IoStatus The status from Udp6 instance.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Context The pointer to the context.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync NET_CHECK_SIGNATURE (Instance, MTFTP6_INSTANCE_SIGNATURE);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Return error status if Udp6 instance failed to receive.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Find the port this packet is from to restart receive correctly.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Client send initial request to server's listening port. Server
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // will select a UDP port to communicate with the client. The server
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // is required to use the same port as RemotePort to multicast the
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if (UdpEpt->RemotePort != Instance->ServerDataPort) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // For the subsequent exchange of requests, reconfigure the udpio as
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // (serverip, serverport, localip, localport).
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Ususally, the client set serverport as 0 to receive and reset it
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // once the first packet arrives to send ack.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Copy the MTFTP packet to a continuous buffer if it isn't already so.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Packet = (EFI_MTFTP6_PACKET *) NetbufGetByte (UdpPacket, 0, NULL);
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Callback to the user's CheckPacket if provided. Abort the transmission
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // if CheckPacket returns an EFI_ERROR code.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync (Opcode == EFI_MTFTP6_OPCODE_OACK || Opcode == EFI_MTFTP6_OPCODE_ERROR)
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Send an error message to the server to inform it
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Free the received packet before send new packet in ReceiveNotify,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // since the udpio might need to be reconfigured.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Send the Mtftp6 error message if user aborted the current session.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Switch the process routines by the operation code.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync if ((Len > (UINT32) (MTFTP6_DATA_HEAD_LEN + Instance->BlkSize)) || (Len < (UINT32) MTFTP6_DATA_HEAD_LEN)) {
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Handle the data packet of Rrq.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Handle the Oack packet of Rrq.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Drop and return eror if received error message.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Free the resources, then if !EFI_ERROR (Status), restart the
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // receive, otherwise end the session.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // Clean up the current session if failed to continue.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Start the Mtftp6 instance to download. It first initializes some
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync of the internal states, then builds and sends an RRQ reqeuest packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync Finally, it starts receive for the downloading.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Instance The pointer to the Mtftp6 instance.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @param[in] Operation The operation code of current packet.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval EFI_SUCCESS The Mtftp6 is started to download.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync @retval Others Failed to start to download.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // The valid block number range are [1, 0xffff]. For example:
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // the client sends an RRQ request to the server, the server
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // transfers the DATA1 block. If option negoitation is ongoing,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync // the server will send back an OACK, then client will send ACK0.