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qemu / edk2 / 558a25366d66e9ff96784ed3aab476f808531bf3 / . / NetworkPkg / UefiPxeBcDxe / PxeBcDhcp4.c
blob: 91146b78cb1e4931b137b8d060ac5f6f043512cb [file] [log] [blame]
/** @file
Functions implementation related with DHCPv4 for UefiPxeBc Driver.
Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "PxeBcImpl.h"
//
// This is a map from the interested DHCP4 option tags' index to the tag value.
//
UINT8 mInterestedDhcp4Tags[PXEBC_DHCP4_TAG_INDEX_MAX] = {
DHCP4_TAG_BOOTFILE_LEN,
DHCP4_TAG_VENDOR,
DHCP4_TAG_OVERLOAD,
DHCP4_TAG_MSG_TYPE,
DHCP4_TAG_SERVER_ID,
DHCP4_TAG_VENDOR_CLASS_ID,
DHCP4_TAG_BOOTFILE
};
//
// There are 4 times retries with the value of 4, 8, 16 and 32, refers to PXE2.1 spec.
//
UINT32 mPxeDhcpTimeout[4] = { 4, 8, 16, 32 };
/**
Parse a certain dhcp4 option by OptTag in Buffer, and return with start pointer.
@param[in] Buffer Pointer to the option buffer.
@param[in] Length Length of the option buffer.
@param[in] OptTag Tag of the required option.
@retval NULL Failed to find the required option.
@retval Others The position of the required option.
**/
EFI_DHCP4_PACKET_OPTION *
PxeBcParseDhcp4Options (
IN UINT8 *Buffer,
IN UINT32 Length,
IN UINT8 OptTag
)
{
EFI_DHCP4_PACKET_OPTION *Option;
UINT32 Offset;
Option = (EFI_DHCP4_PACKET_OPTION *)Buffer;
Offset = 0;
while (Offset < Length && Option->OpCode != DHCP4_TAG_EOP) {
if (Option->OpCode == OptTag) {
//
// Found the required option.
//
return Option;
}
//
// Skip the current option to the next.
//
if (Option->OpCode == DHCP4_TAG_PAD) {
Offset++;
} else {
Offset += Option->Length + 2;
}
Option = (EFI_DHCP4_PACKET_OPTION *)(Buffer + Offset);
}
return NULL;
}
/**
Parse the PXE vendor options and extract the information from them.
@param[in] Dhcp4Option Pointer to vendor options in buffer.
@param[in] VendorOption Pointer to structure to store information in vendor options.
**/
VOID
PxeBcParseVendorOptions (
IN EFI_DHCP4_PACKET_OPTION *Dhcp4Option,
IN PXEBC_VENDOR_OPTION *VendorOption
)
{
UINT32 *BitMap;
UINT8 VendorOptionLen;
EFI_DHCP4_PACKET_OPTION *PxeOption;
UINT8 Offset;
BitMap = VendorOption->BitMap;
VendorOptionLen = Dhcp4Option->Length;
PxeOption = (EFI_DHCP4_PACKET_OPTION *)&Dhcp4Option->Data[0];
Offset = 0;
ASSERT (PxeOption != NULL);
while ((Offset < VendorOptionLen) && (PxeOption->OpCode != DHCP4_TAG_EOP)) {
//
// Parse all the interesting PXE vendor options one by one.
//
switch (PxeOption->OpCode) {
case PXEBC_VENDOR_TAG_MTFTP_IP:
CopyMem (&VendorOption->MtftpIp, PxeOption->Data, sizeof (EFI_IPv4_ADDRESS));
break;
case PXEBC_VENDOR_TAG_MTFTP_CPORT:
CopyMem (&VendorOption->MtftpCPort, PxeOption->Data, sizeof (VendorOption->MtftpCPort));
break;
case PXEBC_VENDOR_TAG_MTFTP_SPORT:
CopyMem (&VendorOption->MtftpSPort, PxeOption->Data, sizeof (VendorOption->MtftpSPort));
break;
case PXEBC_VENDOR_TAG_MTFTP_TIMEOUT:
VendorOption->MtftpTimeout = *PxeOption->Data;
break;
case PXEBC_VENDOR_TAG_MTFTP_DELAY:
VendorOption->MtftpDelay = *PxeOption->Data;
break;
case PXEBC_VENDOR_TAG_DISCOVER_CTRL:
VendorOption->DiscoverCtrl = *PxeOption->Data;
break;
case PXEBC_VENDOR_TAG_DISCOVER_MCAST:
CopyMem (&VendorOption->DiscoverMcastIp, PxeOption->Data, sizeof (EFI_IPv4_ADDRESS));
break;
case PXEBC_VENDOR_TAG_BOOT_SERVERS:
VendorOption->BootSvrLen = PxeOption->Length;
VendorOption->BootSvr = (PXEBC_BOOT_SVR_ENTRY *)PxeOption->Data;
break;
case PXEBC_VENDOR_TAG_BOOT_MENU:
VendorOption->BootMenuLen = PxeOption->Length;
VendorOption->BootMenu = (PXEBC_BOOT_MENU_ENTRY *)PxeOption->Data;
break;
case PXEBC_VENDOR_TAG_MENU_PROMPT:
VendorOption->MenuPromptLen = PxeOption->Length;
VendorOption->MenuPrompt = (PXEBC_MENU_PROMPT *)PxeOption->Data;
break;
case PXEBC_VENDOR_TAG_MCAST_ALLOC:
CopyMem (&VendorOption->McastIpBase, PxeOption->Data, sizeof (EFI_IPv4_ADDRESS));
CopyMem (&VendorOption->McastIpBlock, PxeOption->Data + 4, sizeof (VendorOption->McastIpBlock));
CopyMem (&VendorOption->McastIpRange, PxeOption->Data + 6, sizeof (VendorOption->McastIpRange));
break;
case PXEBC_VENDOR_TAG_CREDENTIAL_TYPES:
VendorOption->CredTypeLen = PxeOption->Length;
VendorOption->CredType = (UINT32 *)PxeOption->Data;
break;
case PXEBC_VENDOR_TAG_BOOT_ITEM:
CopyMem (&VendorOption->BootSrvType, PxeOption->Data, sizeof (VendorOption->BootSrvType));
CopyMem (&VendorOption->BootSrvLayer, PxeOption->Data + 2, sizeof (VendorOption->BootSrvLayer));
break;
default:
//
// Not interesting PXE vendor options.
//
break;
}
//
// Set the bit map for the special PXE options.
//
SET_VENDOR_OPTION_BIT_MAP (BitMap, PxeOption->OpCode);
//
// Continue to the next option.
//
if (PxeOption->OpCode == DHCP4_TAG_PAD) {
Offset++;
} else {
Offset = (UINT8)(Offset + PxeOption->Length + 2);
}
PxeOption = (EFI_DHCP4_PACKET_OPTION *)(Dhcp4Option->Data + Offset);
}
}
/**
Build the options buffer for the DHCPv4 request packet.
@param[in] Private Pointer to PxeBc private data.
@param[out] OptList Pointer to the option pointer array.
@param[in] Buffer Pointer to the buffer to contain the option list.
@param[in] NeedMsgType If TRUE, it is necessary to include the Msg type option.
Otherwise, it is not necessary.
@return Index The count of the built-in options.
**/
UINT32
PxeBcBuildDhcp4Options (
IN PXEBC_PRIVATE_DATA *Private,
OUT EFI_DHCP4_PACKET_OPTION **OptList,
IN UINT8 *Buffer,
IN BOOLEAN NeedMsgType
)
{
UINT32 Index;
PXEBC_DHCP4_OPTION_ENTRY OptEnt;
UINT16 Value;
Index = 0;
OptList[0] = (EFI_DHCP4_PACKET_OPTION *)Buffer;
if (NeedMsgType) {
//
// Append message type.
//
OptList[Index]->OpCode = DHCP4_TAG_MSG_TYPE;
OptList[Index]->Length = 1;
OptEnt.Mesg = (PXEBC_DHCP4_OPTION_MESG *)OptList[Index]->Data;
OptEnt.Mesg->Type = PXEBC_DHCP4_MSG_TYPE_REQUEST;
Index++;
OptList[Index] = GET_NEXT_DHCP_OPTION (OptList[Index - 1]);
//
// Append max message size.
//
OptList[Index]->OpCode = DHCP4_TAG_MAXMSG;
OptList[Index]->Length = (UINT8)sizeof (PXEBC_DHCP4_OPTION_MAX_MESG_SIZE);
OptEnt.MaxMesgSize = (PXEBC_DHCP4_OPTION_MAX_MESG_SIZE *)OptList[Index]->Data;
Value = NTOHS (PXEBC_DHCP4_PACKET_MAX_SIZE);
CopyMem (&OptEnt.MaxMesgSize->Size, &Value, sizeof (UINT16));
Index++;
OptList[Index] = GET_NEXT_DHCP_OPTION (OptList[Index - 1]);
}
//
// Append parameter request list option.
//
OptList[Index]->OpCode = DHCP4_TAG_PARA_LIST;
OptList[Index]->Length = 35;
OptEnt.Para = (PXEBC_DHCP4_OPTION_PARA *)OptList[Index]->Data;
OptEnt.Para->ParaList[0] = DHCP4_TAG_NETMASK;
OptEnt.Para->ParaList[1] = DHCP4_TAG_TIME_OFFSET;
OptEnt.Para->ParaList[2] = DHCP4_TAG_ROUTER;
OptEnt.Para->ParaList[3] = DHCP4_TAG_TIME_SERVER;
OptEnt.Para->ParaList[4] = DHCP4_TAG_NAME_SERVER;
OptEnt.Para->ParaList[5] = DHCP4_TAG_DNS_SERVER;
OptEnt.Para->ParaList[6] = DHCP4_TAG_HOSTNAME;
OptEnt.Para->ParaList[7] = DHCP4_TAG_BOOTFILE_LEN;
OptEnt.Para->ParaList[8] = DHCP4_TAG_DOMAINNAME;
OptEnt.Para->ParaList[9] = DHCP4_TAG_ROOTPATH;
OptEnt.Para->ParaList[10] = DHCP4_TAG_EXTEND_PATH;
OptEnt.Para->ParaList[11] = DHCP4_TAG_EMTU;
OptEnt.Para->ParaList[12] = DHCP4_TAG_TTL;
OptEnt.Para->ParaList[13] = DHCP4_TAG_BROADCAST;
OptEnt.Para->ParaList[14] = DHCP4_TAG_NIS_DOMAIN;
OptEnt.Para->ParaList[15] = DHCP4_TAG_NIS_SERVER;
OptEnt.Para->ParaList[16] = DHCP4_TAG_NTP_SERVER;
OptEnt.Para->ParaList[17] = DHCP4_TAG_VENDOR;
OptEnt.Para->ParaList[18] = DHCP4_TAG_REQUEST_IP;
OptEnt.Para->ParaList[19] = DHCP4_TAG_LEASE;
OptEnt.Para->ParaList[20] = DHCP4_TAG_SERVER_ID;
OptEnt.Para->ParaList[21] = DHCP4_TAG_T1;
OptEnt.Para->ParaList[22] = DHCP4_TAG_T2;
OptEnt.Para->ParaList[23] = DHCP4_TAG_VENDOR_CLASS_ID;
OptEnt.Para->ParaList[24] = DHCP4_TAG_TFTP;
OptEnt.Para->ParaList[25] = DHCP4_TAG_BOOTFILE;
OptEnt.Para->ParaList[26] = DHCP4_TAG_UUID;
OptEnt.Para->ParaList[27] = 0x80;
OptEnt.Para->ParaList[28] = 0x81;
OptEnt.Para->ParaList[29] = 0x82;
OptEnt.Para->ParaList[30] = 0x83;
OptEnt.Para->ParaList[31] = 0x84;
OptEnt.Para->ParaList[32] = 0x85;
OptEnt.Para->ParaList[33] = 0x86;
OptEnt.Para->ParaList[34] = 0x87;
Index++;
OptList[Index] = GET_NEXT_DHCP_OPTION (OptList[Index - 1]);
//
// Append UUID/Guid-based client identifier option
//
OptList[Index]->OpCode = DHCP4_TAG_UUID;
OptList[Index]->Length = (UINT8)sizeof (PXEBC_DHCP4_OPTION_UUID);
OptEnt.Uuid = (PXEBC_DHCP4_OPTION_UUID *)OptList[Index]->Data;
OptEnt.Uuid->Type = 0;
Index++;
OptList[Index] = GET_NEXT_DHCP_OPTION (OptList[Index - 1]);
if (EFI_ERROR (NetLibGetSystemGuid ((EFI_GUID *)OptEnt.Uuid->Guid))) {
//
// Zero the Guid to indicate NOT programmable if failed to get system Guid.
//
DEBUG ((DEBUG_WARN, "PXE: Failed to read system GUID from the smbios table!\n"));
ZeroMem (OptEnt.Uuid->Guid, sizeof (EFI_GUID));
}
//
// Append client network device interface option
//
OptList[Index]->OpCode = DHCP4_TAG_UNDI;
OptList[Index]->Length = (UINT8)sizeof (PXEBC_DHCP4_OPTION_UNDI);
OptEnt.Undi = (PXEBC_DHCP4_OPTION_UNDI *)OptList[Index]->Data;
if (Private->Nii != NULL) {
OptEnt.Undi->Type = Private->Nii->Type;
OptEnt.Undi->MajorVer = Private->Nii->MajorVer;
OptEnt.Undi->MinorVer = Private->Nii->MinorVer;
} else {
OptEnt.Undi->Type = DEFAULT_UNDI_TYPE;
OptEnt.Undi->MajorVer = DEFAULT_UNDI_MAJOR;
OptEnt.Undi->MinorVer = DEFAULT_UNDI_MINOR;
}
Index++;
OptList[Index] = GET_NEXT_DHCP_OPTION (OptList[Index - 1]);
//
// Append client system architecture option
//
OptList[Index]->OpCode = DHCP4_TAG_ARCH;
OptList[Index]->Length = (UINT8)sizeof (PXEBC_DHCP4_OPTION_ARCH);
OptEnt.Arch = (PXEBC_DHCP4_OPTION_ARCH *)OptList[Index]->Data;
Value = HTONS (EFI_PXE_CLIENT_SYSTEM_ARCHITECTURE);
CopyMem (&OptEnt.Arch->Type, &Value, sizeof (UINT16));
Index++;
OptList[Index] = GET_NEXT_DHCP_OPTION (OptList[Index - 1]);
//
// Append vendor class identify option
//
OptList[Index]->OpCode = DHCP4_TAG_VENDOR_CLASS_ID;
OptList[Index]->Length = (UINT8)sizeof (PXEBC_DHCP4_OPTION_CLID);
OptEnt.Clid = (PXEBC_DHCP4_OPTION_CLID *)OptList[Index]->Data;
CopyMem (
OptEnt.Clid,
DEFAULT_CLASS_ID_DATA,
sizeof (PXEBC_DHCP4_OPTION_CLID)
);
PxeBcUintnToAscDecWithFormat (
EFI_PXE_CLIENT_SYSTEM_ARCHITECTURE,
OptEnt.Clid->ArchitectureType,
sizeof (OptEnt.Clid->ArchitectureType)
);
if (Private->Nii != NULL) {
CopyMem (OptEnt.Clid->InterfaceName, Private->Nii->StringId, sizeof (OptEnt.Clid->InterfaceName));
PxeBcUintnToAscDecWithFormat (Private->Nii->MajorVer, OptEnt.Clid->UndiMajor, sizeof (OptEnt.Clid->UndiMajor));
PxeBcUintnToAscDecWithFormat (Private->Nii->MinorVer, OptEnt.Clid->UndiMinor, sizeof (OptEnt.Clid->UndiMinor));
}
Index++;
return Index;
}
/**
Create a template DHCPv4 packet as a seed.
@param[out] Seed Pointer to the seed packet.
@param[in] Udp4 Pointer to EFI_UDP4_PROTOCOL.
**/
VOID
PxeBcSeedDhcp4Packet (
OUT EFI_DHCP4_PACKET *Seed,
IN EFI_UDP4_PROTOCOL *Udp4
)
{
EFI_SIMPLE_NETWORK_MODE Mode;
EFI_DHCP4_HEADER *Header;
//
// Get IfType and HwAddressSize from SNP mode data.
//
Udp4->GetModeData (Udp4, NULL, NULL, NULL, &Mode);
Seed->Size = sizeof (EFI_DHCP4_PACKET);
Seed->Length = sizeof (Seed->Dhcp4);
Header = &Seed->Dhcp4.Header;
ZeroMem (Header, sizeof (EFI_DHCP4_HEADER));
Header->OpCode = PXEBC_DHCP4_OPCODE_REQUEST;
Header->HwType = Mode.IfType;
Header->HwAddrLen = (UINT8)Mode.HwAddressSize;
CopyMem (Header->ClientHwAddr, &Mode.CurrentAddress, Header->HwAddrLen);
Seed->Dhcp4.Magik = PXEBC_DHCP4_MAGIC;
Seed->Dhcp4.Option[0] = DHCP4_TAG_EOP;
}
/**
Cache the DHCPv4 packet.
@param[in] Dst Pointer to the cache buffer for DHCPv4 packet.
@param[in] Src Pointer to the DHCPv4 packet to be cached.
@retval EFI_SUCCESS Packet is copied.
@retval EFI_BUFFER_TOO_SMALL Cache buffer is not big enough to hold the packet.
**/
EFI_STATUS
PxeBcCacheDhcp4Packet (
IN EFI_DHCP4_PACKET *Dst,
IN EFI_DHCP4_PACKET *Src
)
{
if (Dst->Size < Src->Length) {
return EFI_BUFFER_TOO_SMALL;
}
CopyMem (&Dst->Dhcp4, &Src->Dhcp4, Src->Length);
Dst->Length = Src->Length;
return EFI_SUCCESS;
}
/**
Parse the cached DHCPv4 packet, including all the options.
@param[in] Cache4 Pointer to cached DHCPv4 packet.
@retval EFI_SUCCESS Parsed the DHCPv4 packet successfully.
@retval EFI_DEVICE_ERROR Failed to parse and invalid packet.
**/
EFI_STATUS
PxeBcParseDhcp4Packet (
IN PXEBC_DHCP4_PACKET_CACHE *Cache4
)
{
EFI_DHCP4_PACKET *Offer;
EFI_DHCP4_PACKET_OPTION **Options;
EFI_DHCP4_PACKET_OPTION *Option;
PXEBC_OFFER_TYPE OfferType;
UINTN Index;
BOOLEAN IsProxyOffer;
BOOLEAN IsPxeOffer;
UINT8 *Ptr8;
BOOLEAN FileFieldOverloaded;
IsProxyOffer = FALSE;
IsPxeOffer = FALSE;
FileFieldOverloaded = FALSE;
ZeroMem (Cache4->OptList, sizeof (Cache4->OptList));
ZeroMem (&Cache4->VendorOpt, sizeof (Cache4->VendorOpt));
Offer = &Cache4->Packet.Offer;
Options = Cache4->OptList;
//
// Parse DHCPv4 options in this offer, and store the pointers.
// First, try to parse DHCPv4 options from the DHCP optional parameters field.
//
for (Index = 0; Index < PXEBC_DHCP4_TAG_INDEX_MAX; Index++) {
Options[Index] = PxeBcParseDhcp4Options (
Offer->Dhcp4.Option,
GET_OPTION_BUFFER_LEN (Offer),
mInterestedDhcp4Tags[Index]
);
}
//
// Second, Check if bootfilename and serverhostname is overloaded to carry DHCP options refers to rfc-2132.
// If yes, try to parse options from the BootFileName field, then ServerName field.
//
Option = Options[PXEBC_DHCP4_TAG_INDEX_OVERLOAD];
if (Option != NULL) {
if ((Option->Data[0] & PXEBC_DHCP4_OVERLOAD_FILE) != 0) {
FileFieldOverloaded = TRUE;
for (Index = 0; Index < PXEBC_DHCP4_TAG_INDEX_MAX; Index++) {
if (Options[Index] == NULL) {
Options[Index] = PxeBcParseDhcp4Options (
(UINT8 *)Offer->Dhcp4.Header.BootFileName,
sizeof (Offer->Dhcp4.Header.BootFileName),
mInterestedDhcp4Tags[Index]
);
}
}
}
if ((Option->Data[0] & PXEBC_DHCP4_OVERLOAD_SERVER_NAME) != 0) {
for (Index = 0; Index < PXEBC_DHCP4_TAG_INDEX_MAX; Index++) {
if (Options[Index] == NULL) {
Options[Index] = PxeBcParseDhcp4Options (
(UINT8 *)Offer->Dhcp4.Header.ServerName,
sizeof (Offer->Dhcp4.Header.ServerName),
mInterestedDhcp4Tags[Index]
);
}
}
}
}
//
// The offer with zero "yiaddr" is a proxy offer.
//
if (Offer->Dhcp4.Header.YourAddr.Addr[0] == 0) {
IsProxyOffer = TRUE;
}
//
// The offer with "PXEClient" is a PXE offer.
//
Option = Options[PXEBC_DHCP4_TAG_INDEX_CLASS_ID];
if ((Option != NULL) && (Option->Length >= 9) &&
(CompareMem (Option->Data, DEFAULT_CLASS_ID_DATA, 9) == 0))
{
IsPxeOffer = TRUE;
}
//
// Parse PXE vendor options in this offer, and store the contents/pointers.
//
Option = Options[PXEBC_DHCP4_TAG_INDEX_VENDOR];
if (IsPxeOffer && (Option != NULL)) {
PxeBcParseVendorOptions (Option, &Cache4->VendorOpt);
}
//
// Parse PXE boot file name:
// According to PXE spec, boot file name should be read from DHCP option 67 (bootfile name) if present.
// Otherwise, read from boot file field in DHCP header.
//
if (Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] != NULL) {
//
// RFC 2132, Section 9.5 does not strictly state Bootfile name (option 67) is null
// terminated string. So force to append null terminated character at the end of string.
//
Ptr8 = (UINT8 *)&Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE]->Data[0];
Ptr8 += Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE]->Length;
if (*(Ptr8 - 1) != '\0') {
*Ptr8 = '\0';
}
} else if (!FileFieldOverloaded && (Offer->Dhcp4.Header.BootFileName[0] != 0)) {
//
// If the bootfile is not present and bootfilename is present in DHCPv4 packet, just parse it.
// Do not count dhcp option header here, or else will destroy the serverhostname.
//
Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] = (EFI_DHCP4_PACKET_OPTION *)
(&Offer->Dhcp4.Header.BootFileName[0] -
OFFSET_OF (EFI_DHCP4_PACKET_OPTION, Data[0]));
}
//
// Determine offer type of the DHCPv4 packet.
//
Option = Options[PXEBC_DHCP4_TAG_INDEX_MSG_TYPE];
if ((Option == NULL) || (Option->Data[0] == 0)) {
//
// It's a Bootp offer.
//
OfferType = PxeOfferTypeBootp;
Option = Cache4->OptList[PXEBC_DHCP4_TAG_INDEX_BOOTFILE];
if (Option == NULL) {
//
// If the Bootp offer without bootfilename, discard it.
//
return EFI_DEVICE_ERROR;
}
} else {
if (IS_VALID_DISCOVER_VENDOR_OPTION (Cache4->VendorOpt.BitMap)) {
//
// It's a PXE10 offer with PXEClient and discover vendor option.
//
OfferType = IsProxyOffer ? PxeOfferTypeProxyPxe10 : PxeOfferTypeDhcpPxe10;
} else if (IS_VALID_MTFTP_VENDOR_OPTION (Cache4->VendorOpt.BitMap)) {
//
// It's a WFM11a offer with PXEClient and mtftp vendor option.
// But multi-cast download is not supported currently, so discard it.
//
return EFI_DEVICE_ERROR;
} else if (IsPxeOffer) {
//
// It's a BINL offer only with PXEClient.
//
OfferType = IsProxyOffer ? PxeOfferTypeProxyBinl : PxeOfferTypeDhcpBinl;
} else {
//
// It's a DHCPv4 only offer, which is a pure DHCPv4 offer packet.
//
OfferType = PxeOfferTypeDhcpOnly;
}
}
Cache4->OfferType = OfferType;
return EFI_SUCCESS;
}
/**
Cache the DHCPv4 ack packet, and parse it on demand.
@param[in] Private Pointer to PxeBc private data.
@param[in] Ack Pointer to the DHCPv4 ack packet.
@param[in] Verified If TRUE, parse the ACK packet and store info into mode data.
@retval EFI_SUCCESS Cache and parse the packet successfully.
@retval EFI_BUFFER_TOO_SMALL Cache buffer is not big enough to hold the packet.
**/
EFI_STATUS
PxeBcCopyDhcp4Ack (
IN PXEBC_PRIVATE_DATA *Private,
IN EFI_DHCP4_PACKET *Ack,
IN BOOLEAN Verified
)
{
EFI_PXE_BASE_CODE_MODE *Mode;
EFI_STATUS Status;
Mode = Private->PxeBc.Mode;
Status = PxeBcCacheDhcp4Packet (&Private->DhcpAck.Dhcp4.Packet.Ack, Ack);
if (EFI_ERROR (Status)) {
return Status;
}
if (Verified) {
//
// Parse the ack packet and store it into mode data if needed.
//
PxeBcParseDhcp4Packet (&Private->DhcpAck.Dhcp4);
CopyMem (&Mode->DhcpAck.Dhcpv4, &Ack->Dhcp4, Ack->Length);
Mode->DhcpAckReceived = TRUE;
}
return EFI_SUCCESS;
}
/**
Cache the DHCPv4 proxy offer packet according to the received order.
@param[in] Private Pointer to PxeBc private data.
@param[in] OfferIndex The received order of offer packets.
@retval EFI_SUCCESS Cache and parse the packet successfully.
@retval EFI_BUFFER_TOO_SMALL Cache buffer is not big enough to hold the packet.
**/
EFI_STATUS
PxeBcCopyProxyOffer (
IN PXEBC_PRIVATE_DATA *Private,
IN UINT32 OfferIndex
)
{
EFI_PXE_BASE_CODE_MODE *Mode;
EFI_DHCP4_PACKET *Offer;
EFI_STATUS Status;
ASSERT (OfferIndex < Private->OfferNum);
ASSERT (OfferIndex < PXEBC_OFFER_MAX_NUM);
Mode = Private->PxeBc.Mode;
Offer = &Private->OfferBuffer[OfferIndex].Dhcp4.Packet.Offer;
//
// Cache the proxy offer packet and parse it.
//
Status = PxeBcCacheDhcp4Packet (&Private->ProxyOffer.Dhcp4.Packet.Offer, Offer);
if (EFI_ERROR (Status)) {
return Status;
}
PxeBcParseDhcp4Packet (&Private->ProxyOffer.Dhcp4);
//
// Store this packet into mode data.
//
CopyMem (&Mode->ProxyOffer.Dhcpv4, &Offer->Dhcp4, Offer->Length);
Mode->ProxyOfferReceived = TRUE;
return EFI_SUCCESS;
}
/**
Retry to request bootfile name by the BINL offer.
@param[in] Private Pointer to PxeBc private data.
@param[in] Index The received order of offer packets.
@retval EFI_SUCCESS Successfully retried to request bootfile name.
@retval EFI_DEVICE_ERROR Failed to retry bootfile name.
**/
EFI_STATUS
PxeBcRetryBinlOffer (
IN PXEBC_PRIVATE_DATA *Private,
IN UINT32 Index
)
{
EFI_DHCP4_PACKET *Offer;
EFI_IP_ADDRESS ServerIp;
EFI_STATUS Status;
PXEBC_DHCP4_PACKET_CACHE *Cache4;
EFI_DHCP4_PACKET *Reply;
ASSERT (Index < PXEBC_OFFER_MAX_NUM);
ASSERT (
Private->OfferBuffer[Index].Dhcp4.OfferType == PxeOfferTypeDhcpBinl ||
Private->OfferBuffer[Index].Dhcp4.OfferType == PxeOfferTypeProxyBinl
);
Offer = &Private->OfferBuffer[Index].Dhcp4.Packet.Offer;
//
// Prefer to siaddr in header as next server address. If it's zero, then use option 54.
//
if (Offer->Dhcp4.Header.ServerAddr.Addr[0] == 0) {
CopyMem (
&ServerIp.Addr[0],
Private->OfferBuffer[Index].Dhcp4.OptList[PXEBC_DHCP4_TAG_INDEX_SERVER_ID]->Data,
sizeof (EFI_IPv4_ADDRESS)
);
} else {
CopyMem (
&ServerIp.Addr[0],
&Offer->Dhcp4.Header.ServerAddr,
sizeof (EFI_IPv4_ADDRESS)
);
}
Private->IsDoDiscover = FALSE;
Cache4 = &Private->ProxyOffer.Dhcp4;
Reply = &Cache4->Packet.Offer;
//
// Send another request packet for bootfile name.
//
Status = PxeBcDhcp4Discover (
Private,
0,
NULL,
FALSE,
&ServerIp,
0,
NULL
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Parse the reply for the last request packet.
//
Status = PxeBcParseDhcp4Packet (Cache4);
if (EFI_ERROR (Status)) {
return Status;
}
if ((Cache4->OfferType != PxeOfferTypeProxyPxe10) &&
(Cache4->OfferType != PxeOfferTypeProxyWfm11a) &&
(Cache4->OptList[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] == NULL))
{
//
// This BINL ack doesn't have discovery option set or multicast option set
// or bootfile name specified.
//
return EFI_DEVICE_ERROR;
}
//
// Store the reply into mode data.
//
Private->PxeBc.Mode->ProxyOfferReceived = TRUE;
CopyMem (&Private->PxeBc.Mode->ProxyOffer.Dhcpv4, &Reply->Dhcp4, Reply->Length);
return EFI_SUCCESS;
}
/**
Cache all the received DHCPv4 offers, and set OfferIndex and OfferCount.
@param[in] Private Pointer to PxeBc private data.
@param[in] RcvdOffer Pointer to the received offer packet.
@retval EFI_SUCCESS Cache and parse the packet successfully.
@retval Others Operation failed.
**/
EFI_STATUS
PxeBcCacheDhcp4Offer (
IN PXEBC_PRIVATE_DATA *Private,
IN EFI_DHCP4_PACKET *RcvdOffer
)
{
PXEBC_DHCP4_PACKET_CACHE *Cache4;
EFI_DHCP4_PACKET *Offer;
PXEBC_OFFER_TYPE OfferType;
EFI_STATUS Status;
ASSERT (Private->OfferNum < PXEBC_OFFER_MAX_NUM);
Cache4 = &Private->OfferBuffer[Private->OfferNum].Dhcp4;
Offer = &Cache4->Packet.Offer;
//
// Cache the content of DHCPv4 packet firstly.
//
Status = PxeBcCacheDhcp4Packet (Offer, RcvdOffer);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Validate the DHCPv4 packet, and parse the options and offer type.
//
if (EFI_ERROR (PxeBcParseDhcp4Packet (Cache4))) {
return EFI_ABORTED;
}
//
// Determine whether cache the current offer by type, and record OfferIndex and OfferCount.
//
OfferType = Cache4->OfferType;
ASSERT (OfferType < PxeOfferTypeMax);
if (OfferType == PxeOfferTypeBootp) {
//
// It's a Bootp offer, only cache the first one, and discard the others.
//
if (Private->OfferCount[OfferType] == 0) {
Private->OfferIndex[OfferType][0] = Private->OfferNum;
Private->OfferCount[OfferType] = 1;
} else {
return EFI_ABORTED;
}
} else {
ASSERT (Private->OfferCount[OfferType] < PXEBC_OFFER_MAX_NUM);
if (IS_PROXY_DHCP_OFFER (Offer)) {
//
// It's a proxy offer without yiaddr, including PXE10, WFM11a or BINL offer.
//
Private->IsProxyRecved = TRUE;
if (OfferType == PxeOfferTypeProxyBinl) {
//
// Cache all proxy BINL offers.
//
Private->OfferIndex[OfferType][Private->OfferCount[OfferType]] = Private->OfferNum;
Private->OfferCount[OfferType]++;
} else if (((OfferType == PxeOfferTypeProxyPxe10) || (OfferType == PxeOfferTypeProxyWfm11a)) &&
(Private->OfferCount[OfferType] < 1))
{
//
// Only cache the first PXE10/WFM11a offer, and discard the others.
//
Private->OfferIndex[OfferType][0] = Private->OfferNum;
Private->OfferCount[OfferType] = 1;
} else {
return EFI_ABORTED;
}
} else {
//
// It's a DHCPv4 offer with yiaddr, and cache them all.
//
Private->OfferIndex[OfferType][Private->OfferCount[OfferType]] = Private->OfferNum;
Private->OfferCount[OfferType]++;
}
}
Private->OfferNum++;
return EFI_SUCCESS;
}
/**
Select an DHCPv4 offer, and record SelectIndex and SelectProxyType.
@param[in] Private Pointer to PxeBc private data.
**/
VOID
PxeBcSelectDhcp4Offer (
IN PXEBC_PRIVATE_DATA *Private
)
{
UINT32 Index;
UINT32 OfferIndex;
EFI_DHCP4_PACKET *Offer;
Private->SelectIndex = 0;
if (Private->IsOfferSorted) {
//
// Select offer by default policy.
//
if (Private->OfferCount[PxeOfferTypeDhcpPxe10] > 0) {
//
// 1. DhcpPxe10 offer
//
Private->SelectIndex = Private->OfferIndex[PxeOfferTypeDhcpPxe10][0] + 1;
} else if (Private->OfferCount[PxeOfferTypeDhcpWfm11a] > 0) {
//
// 2. DhcpWfm11a offer
//
Private->SelectIndex = Private->OfferIndex[PxeOfferTypeDhcpWfm11a][0] + 1;
} else if ((Private->OfferCount[PxeOfferTypeDhcpOnly] > 0) &&
(Private->OfferCount[PxeOfferTypeProxyPxe10] > 0))
{
//
// 3. DhcpOnly offer and ProxyPxe10 offer.
//
Private->SelectIndex = Private->OfferIndex[PxeOfferTypeDhcpOnly][0] + 1;
Private->SelectProxyType = PxeOfferTypeProxyPxe10;
} else if ((Private->OfferCount[PxeOfferTypeDhcpOnly] > 0) &&
(Private->OfferCount[PxeOfferTypeProxyWfm11a] > 0))
{
//
// 4. DhcpOnly offer and ProxyWfm11a offer.
//
Private->SelectIndex = Private->OfferIndex[PxeOfferTypeDhcpOnly][0] + 1;
Private->SelectProxyType = PxeOfferTypeProxyWfm11a;
} else if (Private->OfferCount[PxeOfferTypeDhcpBinl] > 0) {
//
// 5. DhcpBinl offer.
//
Private->SelectIndex = Private->OfferIndex[PxeOfferTypeDhcpBinl][0] + 1;
} else if ((Private->OfferCount[PxeOfferTypeDhcpOnly] > 0) &&
(Private->OfferCount[PxeOfferTypeProxyBinl] > 0))
{
//
// 6. DhcpOnly offer and ProxyBinl offer.
//
Private->SelectIndex = Private->OfferIndex[PxeOfferTypeDhcpOnly][0] + 1;
Private->SelectProxyType = PxeOfferTypeProxyBinl;
} else {
//
// 7. DhcpOnly offer with bootfilename.
//
for (Index = 0; Index < Private->OfferCount[PxeOfferTypeDhcpOnly]; Index++) {
OfferIndex = Private->OfferIndex[PxeOfferTypeDhcpOnly][Index];
if (Private->OfferBuffer[OfferIndex].Dhcp4.OptList[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] != NULL) {
Private->SelectIndex = OfferIndex + 1;
break;
}
}
//
// 8. Bootp offer with bootfilename.
//
OfferIndex = Private->OfferIndex[PxeOfferTypeBootp][0];
if ((Private->SelectIndex == 0) &&
(Private->OfferCount[PxeOfferTypeBootp] > 0) &&
(Private->OfferBuffer[OfferIndex].Dhcp4.OptList[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] != NULL))
{
Private->SelectIndex = OfferIndex + 1;
}
}
} else {
//
// Select offer by received order.
//
for (Index = 0; Index < Private->OfferNum; Index++) {
Offer = &Private->OfferBuffer[Index].Dhcp4.Packet.Offer;
if (IS_PROXY_DHCP_OFFER (Offer)) {
//
// Skip proxy offers
//
continue;
}
if (!Private->IsProxyRecved &&
(Private->OfferBuffer[Index].Dhcp4.OfferType == PxeOfferTypeDhcpOnly) &&
(Private->OfferBuffer[Index].Dhcp4.OptList[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] == NULL))
{
//
// Skip if DhcpOnly offer without any other proxy offers or bootfilename.
//
continue;
}
//
// Record the index of the select offer.
//
Private->SelectIndex = Index + 1;
break;
}
}
}
/**
Handle the DHCPv4 offer packet.
@param[in] Private Pointer to PxeBc private data.
@retval EFI_SUCCESS Handled the DHCPv4 offer packet successfully.
@retval EFI_NO_RESPONSE No response to the following request packet.
@retval EFI_NOT_FOUND No boot filename received.
@retval EFI_BUFFER_TOO_SMALL Can't cache the offer pacet.
**/
EFI_STATUS
PxeBcHandleDhcp4Offer (
IN PXEBC_PRIVATE_DATA *Private
)
{
PXEBC_DHCP4_PACKET_CACHE *Cache4;
EFI_DHCP4_PACKET_OPTION **Options;
UINT32 Index;
EFI_DHCP4_PACKET *Offer;
PXEBC_OFFER_TYPE OfferType;
UINT32 ProxyIndex;
UINT32 SelectIndex;
EFI_STATUS Status;
EFI_PXE_BASE_CODE_MODE *Mode;
EFI_DHCP4_PACKET *Ack;
ASSERT (Private->SelectIndex > 0);
SelectIndex = (UINT32)(Private->SelectIndex - 1);
ASSERT (SelectIndex < PXEBC_OFFER_MAX_NUM);
Cache4 = &Private->OfferBuffer[SelectIndex].Dhcp4;
Options = Cache4->OptList;
Status = EFI_SUCCESS;
if (Cache4->OfferType == PxeOfferTypeDhcpBinl) {
//
// DhcpBinl offer is selected, so need try to request bootfilename by this offer.
//
if (EFI_ERROR (PxeBcRetryBinlOffer (Private, SelectIndex))) {
Status = EFI_NO_RESPONSE;
}
} else if (Cache4->OfferType == PxeOfferTypeDhcpOnly) {
if (Private->IsProxyRecved) {
//
// DhcpOnly offer is selected, so need try to request bootfile name.
//
ProxyIndex = 0;
if (Private->IsOfferSorted) {
//
// The proxy offer should be determined if select by default policy.
// IsOfferSorted means all offers are labeled by OfferIndex.
//
ASSERT (Private->SelectProxyType < PxeOfferTypeMax);
ASSERT (Private->OfferCount[Private->SelectProxyType] > 0);
if (Private->SelectProxyType == PxeOfferTypeProxyBinl) {
//
// Try all the cached ProxyBinl offer one by one to request bootfile name.
//
for (Index = 0; Index < Private->OfferCount[Private->SelectProxyType]; Index++) {
ASSERT (Index < PXEBC_OFFER_MAX_NUM);
ProxyIndex = Private->OfferIndex[Private->SelectProxyType][Index];
if (!EFI_ERROR (PxeBcRetryBinlOffer (Private, ProxyIndex))) {
break;
}
}
if (Index == Private->OfferCount[Private->SelectProxyType]) {
Status = EFI_NO_RESPONSE;
}
} else {
//
// For other proxy offers, only one is buffered.
//
ProxyIndex = Private->OfferIndex[Private->SelectProxyType][0];
}
} else {
//
// The proxy offer should not be determined if select by received order.
//
Status = EFI_NO_RESPONSE;
for (Index = 0; Index < Private->OfferNum; Index++) {
ASSERT (Index < PXEBC_OFFER_MAX_NUM);
Offer = &Private->OfferBuffer[Index].Dhcp4.Packet.Offer;
OfferType = Private->OfferBuffer[Index].Dhcp4.OfferType;
if (!IS_PROXY_DHCP_OFFER (Offer)) {
//
// Skip non proxy DHCPv4 offers.
//
continue;
}
if (OfferType == PxeOfferTypeProxyBinl) {
//
// Try all the cached ProxyBinl offer one by one to request bootfile name.
//
if (EFI_ERROR (PxeBcRetryBinlOffer (Private, Index))) {
continue;
}
}
Private->SelectProxyType = OfferType;
ProxyIndex = Index;
Status = EFI_SUCCESS;
break;
}
}
if (!EFI_ERROR (Status) && (Private->SelectProxyType != PxeOfferTypeProxyBinl)) {
//
// Success to try to request by a ProxyPxe10 or ProxyWfm11a offer, copy and parse it.
//
Status = PxeBcCopyProxyOffer (Private, ProxyIndex);
}
} else {
//
// Otherwise, the bootfile name must be included in DhcpOnly offer.
//
if (Options[PXEBC_DHCP4_TAG_INDEX_BOOTFILE] == NULL) {
Status = EFI_NOT_FOUND;
}
}
}
if (!EFI_ERROR (Status)) {
//
// All PXE boot information is ready by now.
//
Mode = Private->PxeBc.Mode;
Offer = &Cache4->Packet.Offer;
Ack = &Private->DhcpAck.Dhcp4.Packet.Ack;
if (Cache4->OfferType == PxeOfferTypeBootp) {
//
// Bootp is a special case that only 2 packets involved instead of 4. So the bootp's reply
// should be taken as ack.
//
Ack = Offer;
}
Status = PxeBcCopyDhcp4Ack (Private, Ack, TRUE);
if (EFI_ERROR (Status)) {
return Status;
}
Mode->DhcpDiscoverValid = TRUE;
}
return Status;
}
/**
EFI_DHCP4_CALLBACK is provided by the consumer of the EFI DHCPv4 Protocol driver
to intercept events that occurred in the configuration process.
@param[in] This Pointer to the EFI DHCPv4 Protocol.
@param[in] Context Pointer to the context set by EFI_DHCP4_PROTOCOL.Configure().
@param[in] CurrentState The current operational state of the EFI DHCPv4 Protocol driver.
@param[in] Dhcp4Event The event that occurs in the current state, which usually means a
state transition.
@param[in] Packet The DHCPv4 packet that is going to be sent or already received.
@param[out] NewPacket The packet that is used to replace the above Packet.
@retval EFI_SUCCESS Tells the EFI DHCPv4 Protocol driver to continue the DHCP process.
@retval EFI_NOT_READY Only used in the Dhcp4Selecting state. The EFI DHCPv4 Protocol
driver will continue to wait for more DHCPOFFER packets until the
retry timeout expires.
@retval EFI_ABORTED Tells the EFI DHCPv4 Protocol driver to abort the current process
and return to the Dhcp4Init or Dhcp4InitReboot state.
**/
EFI_STATUS
EFIAPI
PxeBcDhcp4CallBack (
IN EFI_DHCP4_PROTOCOL *This,
IN VOID *Context,
IN EFI_DHCP4_STATE CurrentState,
IN EFI_DHCP4_EVENT Dhcp4Event,
IN EFI_DHCP4_PACKET *Packet OPTIONAL,
OUT EFI_DHCP4_PACKET **NewPacket OPTIONAL
)
{
PXEBC_PRIVATE_DATA *Private;
EFI_PXE_BASE_CODE_MODE *Mode;
EFI_PXE_BASE_CODE_CALLBACK_PROTOCOL *Callback;
EFI_DHCP4_PACKET_OPTION *MaxMsgSize;
UINT16 Value;
EFI_STATUS Status;
BOOLEAN Received;
if ((Dhcp4Event != Dhcp4RcvdOffer) &&
(Dhcp4Event != Dhcp4SelectOffer) &&
(Dhcp4Event != Dhcp4SendDiscover) &&
(Dhcp4Event != Dhcp4RcvdAck))
{
return EFI_SUCCESS;
}
ASSERT (Packet != NULL);
Private = (PXEBC_PRIVATE_DATA *)Context;
Mode = Private->PxeBc.Mode;
Callback = Private->PxeBcCallback;
//
// Override the Maximum DHCP Message Size.
//
MaxMsgSize = PxeBcParseDhcp4Options (
Packet->Dhcp4.Option,
GET_OPTION_BUFFER_LEN (Packet),
DHCP4_TAG_MAXMSG
);
if (MaxMsgSize != NULL) {
Value = HTONS (PXEBC_DHCP4_PACKET_MAX_SIZE);
CopyMem (MaxMsgSize->Data, &Value, sizeof (Value));
}
//
// Callback to user if any packets sent or received.
//
if ((Dhcp4Event != Dhcp4SelectOffer) && (Callback != NULL)) {
Received = (BOOLEAN)(Dhcp4Event == Dhcp4RcvdOffer || Dhcp4Event == Dhcp4RcvdAck);
Status = Callback->Callback (
Callback,
Private->Function,
Received,
Packet->Length,
(EFI_PXE_BASE_CODE_PACKET *)&Packet->Dhcp4
);
if (Status != EFI_PXE_BASE_CODE_CALLBACK_STATUS_CONTINUE) {
return EFI_ABORTED;
}
}
Status = EFI_SUCCESS;
switch (Dhcp4Event) {
case Dhcp4SendDiscover:
if (Packet->Length > PXEBC_DHCP4_PACKET_MAX_SIZE) {
//
// If the to be sent packet exceeds the maximum length, abort the DHCP process.
//
Status = EFI_ABORTED;
break;
}
//
// Cache the DHCPv4 discover packet to mode data directly.
// It need to check SendGuid as well as Dhcp4SendRequest.
//
CopyMem (&Mode->DhcpDiscover.Dhcpv4, &Packet->Dhcp4, Packet->Length);
case Dhcp4SendRequest:
if (Packet->Length > PXEBC_DHCP4_PACKET_MAX_SIZE) {
//
// If the to be sent packet exceeds the maximum length, abort the DHCP process.
//
Status = EFI_ABORTED;
break;
}
if (Mode->SendGUID) {
//
// Send the system Guid instead of the MAC address as the hardware address if required.
//
if (EFI_ERROR (NetLibGetSystemGuid ((EFI_GUID *)Packet->Dhcp4.Header.ClientHwAddr))) {
//
// Zero the Guid to indicate NOT programmable if failed to get system Guid.
//
DEBUG ((DEBUG_WARN, "PXE: Failed to read system GUID from the smbios table!\n"));
ZeroMem (Packet->Dhcp4.Header.ClientHwAddr, sizeof (EFI_GUID));
}
Packet->Dhcp4.Header.HwAddrLen = (UINT8)sizeof (EFI_GUID);
}
break;
case Dhcp4RcvdOffer:
Status = EFI_NOT_READY;
if (Packet->Length > PXEBC_DHCP4_PACKET_MAX_SIZE) {
//
// Ignore the incoming packets which exceed the maximum length.
//
break;
}
if (Private->OfferNum < PXEBC_OFFER_MAX_NUM) {
//
// Cache the DHCPv4 offers to OfferBuffer[] for select later, and record
// the OfferIndex and OfferCount.
// If error happens, just ignore this packet and continue to wait more offer.
//
PxeBcCacheDhcp4Offer (Private, Packet);
}
break;
case Dhcp4SelectOffer:
ASSERT (NewPacket != NULL);
//
// Select offer by the default policy or by order, and record the SelectIndex
// and SelectProxyType.
//
PxeBcSelectDhcp4Offer (Private);
if (Private->SelectIndex == 0) {
Status = EFI_ABORTED;
} else {
*NewPacket = &Private->OfferBuffer[Private->SelectIndex - 1].Dhcp4.Packet.Offer;
}
break;
case Dhcp4RcvdAck:
//
// Cache the DHCPv4 ack to Private->Dhcp4Ack, but it's not the final ack in mode data
// without verification.
//
ASSERT (Private->SelectIndex != 0);
Status = PxeBcCopyDhcp4Ack (Private, Packet, FALSE);
if (EFI_ERROR (Status)) {
Status = EFI_ABORTED;
}
break;
default:
break;
}
return Status;
}
/**
Build and send out the request packet for the bootfile, and parse the reply.
@param[in] Private Pointer to PxeBc private data.
@param[in] Type PxeBc option boot item type.
@param[in] Layer Pointer to option boot item layer.
@param[in] UseBis Use BIS or not.
@param[in] DestIp Pointer to the server address.
@param[in] IpCount The total count of the server address.
@param[in] SrvList Pointer to EFI_PXE_BASE_CODE_SRVLIST.
@retval EFI_SUCCESS Successfully discovered boot file.
@retval EFI_OUT_OF_RESOURCES Failed to allocate resource.
@retval EFI_NOT_FOUND Can't get the PXE reply packet.
@retval Others Failed to discover boot file.
**/
EFI_STATUS
PxeBcDhcp4Discover (
IN PXEBC_PRIVATE_DATA *Private,
IN UINT16 Type,
IN UINT16 *Layer,
IN BOOLEAN UseBis,
IN EFI_IP_ADDRESS *DestIp,
IN UINT16 IpCount,
IN EFI_PXE_BASE_CODE_SRVLIST *SrvList
)
{
EFI_PXE_BASE_CODE_UDP_PORT Sport;
EFI_PXE_BASE_CODE_MODE *Mode;
EFI_DHCP4_PROTOCOL *Dhcp4;
EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN Token;
BOOLEAN IsBCast;
EFI_STATUS Status;
UINT16 RepIndex;
UINT16 SrvIndex;
UINT16 TryIndex;
EFI_DHCP4_LISTEN_POINT ListenPoint;
EFI_DHCP4_PACKET *Response;
UINT8 Buffer[PXEBC_DHCP4_OPTION_MAX_SIZE];
EFI_DHCP4_PACKET_OPTION *OptList[PXEBC_DHCP4_OPTION_MAX_NUM];
UINT32 OptCount;
EFI_DHCP4_PACKET_OPTION *PxeOpt;
PXEBC_OPTION_BOOT_ITEM *PxeBootItem;
UINT8 VendorOptLen;
UINT32 Xid;
Mode = Private->PxeBc.Mode;
Dhcp4 = Private->Dhcp4;
Status = EFI_SUCCESS;
ZeroMem (&Token, sizeof (EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN));
//
// Use broadcast if destination address not specified.
//
if (DestIp == NULL) {
Sport = PXEBC_DHCP4_S_PORT;
IsBCast = TRUE;
} else {
Sport = PXEBC_BS_DISCOVER_PORT;
IsBCast = FALSE;
}
if (!UseBis && (Layer != NULL)) {
*Layer &= EFI_PXE_BASE_CODE_BOOT_LAYER_MASK;
}
//
// Build all the options for the request packet.
//
OptCount = PxeBcBuildDhcp4Options (Private, OptList, Buffer, TRUE);
if (Private->IsDoDiscover) {
//
// Add vendor option of PXE_BOOT_ITEM
//
VendorOptLen = (UINT8)((sizeof (EFI_DHCP4_PACKET_OPTION) - 1) * 2 + sizeof (PXEBC_OPTION_BOOT_ITEM) + 1);
OptList[OptCount] = AllocateZeroPool (VendorOptLen);
if (OptList[OptCount] == NULL) {
return EFI_OUT_OF_RESOURCES;
}
OptList[OptCount]->OpCode = DHCP4_TAG_VENDOR;
OptList[OptCount]->Length = (UINT8)(VendorOptLen - 2);
PxeOpt = (EFI_DHCP4_PACKET_OPTION *)OptList[OptCount]->Data;
PxeOpt->OpCode = PXEBC_VENDOR_TAG_BOOT_ITEM;
PxeOpt->Length = (UINT8)sizeof (PXEBC_OPTION_BOOT_ITEM);
PxeBootItem = (PXEBC_OPTION_BOOT_ITEM *)PxeOpt->Data;
PxeBootItem->Type = HTONS (Type);
PxeOpt->Data[PxeOpt->Length] = DHCP4_TAG_EOP;
if (Layer != NULL) {
PxeBootItem->Layer = HTONS (*Layer);
}
OptCount++;
}
//
// Build the request packet with seed packet and option list.
//
Status = Dhcp4->Build (
Dhcp4,
&Private->SeedPacket,
0,
NULL,
OptCount,
OptList,
&Token.Packet
);
//
// Free the vendor option of PXE_BOOT_ITEM.
//
if (Private->IsDoDiscover) {
FreePool (OptList[OptCount - 1]);
}
if (EFI_ERROR (Status)) {
return Status;
}
if (Mode->SendGUID) {
if (EFI_ERROR (NetLibGetSystemGuid ((EFI_GUID *)Token.Packet->Dhcp4.Header.ClientHwAddr))) {
//
// Zero the Guid to indicate NOT programmable if failed to get system Guid.
//
DEBUG ((DEBUG_WARN, "PXE: Failed to read system GUID from the smbios table!\n"));
ZeroMem (Token.Packet->Dhcp4.Header.ClientHwAddr, sizeof (EFI_GUID));
}
Token.Packet->Dhcp4.Header.HwAddrLen = (UINT8)sizeof (EFI_GUID);
}
//
// Set fields of the token for the request packet.
//
Xid = NET_RANDOM (NetRandomInitSeed ());
Token.Packet->Dhcp4.Header.Xid = HTONL (Xid);
Token.Packet->Dhcp4.Header.Reserved = HTONS ((UINT16)((IsBCast) ? 0x8000 : 0x0));
CopyMem (&Token.Packet->Dhcp4.Header.ClientAddr, &Private->StationIp, sizeof (EFI_IPv4_ADDRESS));
Token.RemotePort = Sport;
if (IsBCast) {
SetMem (&Token.RemoteAddress, sizeof (EFI_IPv4_ADDRESS), 0xff);
} else {
CopyMem (&Token.RemoteAddress, DestIp, sizeof (EFI_IPv4_ADDRESS));
}
CopyMem (&Token.GatewayAddress, &Private->GatewayIp, sizeof (EFI_IPv4_ADDRESS));
if (!IsBCast) {
Token.ListenPointCount = 1;
Token.ListenPoints = &ListenPoint;
Token.ListenPoints[0].ListenPort = PXEBC_BS_DISCOVER_PORT;
CopyMem (&Token.ListenPoints[0].ListenAddress, &Private->StationIp, sizeof (EFI_IPv4_ADDRESS));
CopyMem (&Token.ListenPoints[0].SubnetMask, &Private->SubnetMask, sizeof (EFI_IPv4_ADDRESS));
}
//
// Send out the request packet to discover the bootfile.
//
for (TryIndex = 1; TryIndex <= PXEBC_BOOT_REQUEST_RETRIES; TryIndex++) {
Token.TimeoutValue = (UINT16)(PXEBC_BOOT_REQUEST_TIMEOUT * TryIndex);
Token.Packet->Dhcp4.Header.Seconds = (UINT16)(PXEBC_BOOT_REQUEST_TIMEOUT * (TryIndex - 1));
Status = Dhcp4->TransmitReceive (Dhcp4, &Token);
if (Token.Status != EFI_TIMEOUT) {
break;
}
}
if (TryIndex > PXEBC_BOOT_REQUEST_RETRIES) {
//
// No server response our PXE request
//
Status = EFI_TIMEOUT;
}
if (!EFI_ERROR (Status)) {
RepIndex = 0;
SrvIndex = 0;
Response = Token.ResponseList;
//
// Find the right PXE Reply according to server address.
//
while (RepIndex < Token.ResponseCount) {
if (Response->Length > PXEBC_DHCP4_PACKET_MAX_SIZE) {
SrvIndex = 0;
RepIndex++;
Response = (EFI_DHCP4_PACKET *)((UINT8 *)Response + Response->Size);
continue;
}
while (SrvIndex < IpCount) {
if (SrvList[SrvIndex].AcceptAnyResponse) {
break;
}
if ((SrvList[SrvIndex].Type == Type) &&
EFI_IP4_EQUAL (&Response->Dhcp4.Header.ServerAddr, &SrvList[SrvIndex].IpAddr))
{
break;
}
SrvIndex++;
}
if ((IpCount != SrvIndex) || (IpCount == 0)) {
break;
}
SrvIndex = 0;
RepIndex++;
Response = (EFI_DHCP4_PACKET *)((UINT8 *)Response + Response->Size);
}
if (RepIndex < Token.ResponseCount) {
//
// Cache the right PXE reply packet here, set valid flag later.
// Especially for PXE discover packet, store it into mode data here.
//
if (Private->IsDoDiscover) {
Status = PxeBcCacheDhcp4Packet (&Private->PxeReply.Dhcp4.Packet.Ack, Response);
if (EFI_ERROR (Status)) {
goto ON_EXIT;
}
CopyMem (&Mode->PxeDiscover, &Token.Packet->Dhcp4, Token.Packet->Length);
} else {
Status = PxeBcCacheDhcp4Packet (&Private->ProxyOffer.Dhcp4.Packet.Offer, Response);
if (EFI_ERROR (Status)) {
goto ON_EXIT;
}
}
} else {
//
// Not found the right PXE reply packet.
//
Status = EFI_NOT_FOUND;
}
}
ON_EXIT:
if (Token.ResponseList != NULL) {
FreePool (Token.ResponseList);
}
if (Token.Packet != NULL) {
FreePool (Token.Packet);
}
return Status;
}
/**
Switch the Ip4 policy to static.
@param[in] Private The pointer to PXEBC_PRIVATE_DATA.
@retval EFI_SUCCESS The policy is already configured to static.
@retval Others Other error as indicated..
**/
EFI_STATUS
PxeBcSetIp4Policy (
IN PXEBC_PRIVATE_DATA *Private
)
{
EFI_STATUS Status;
EFI_IP4_CONFIG2_PROTOCOL *Ip4Config2;
EFI_IP4_CONFIG2_POLICY Policy;
UINTN DataSize;
Ip4Config2 = Private->Ip4Config2;
DataSize = sizeof (EFI_IP4_CONFIG2_POLICY);
Status = Ip4Config2->GetData (
Ip4Config2,
Ip4Config2DataTypePolicy,
&DataSize,
&Policy
);
if (EFI_ERROR (Status)) {
return Status;
}
if (Policy != Ip4Config2PolicyStatic) {
Policy = Ip4Config2PolicyStatic;
Status = Ip4Config2->SetData (
Ip4Config2,
Ip4Config2DataTypePolicy,
sizeof (EFI_IP4_CONFIG2_POLICY),
&Policy
);
if (EFI_ERROR (Status)) {
return Status;
}
}
return EFI_SUCCESS;
}
/**
Start the D.O.R.A DHCPv4 process to acquire the IPv4 address and other PXE boot information.
@param[in] Private Pointer to PxeBc private data.
@param[in] Dhcp4 Pointer to the EFI_DHCP4_PROTOCOL
@retval EFI_SUCCESS The D.O.R.A process successfully finished.
@retval Others Failed to finish the D.O.R.A process.
**/
EFI_STATUS
PxeBcDhcp4Dora (
IN PXEBC_PRIVATE_DATA *Private,
IN EFI_DHCP4_PROTOCOL *Dhcp4
)
{
EFI_PXE_BASE_CODE_MODE *PxeMode;
EFI_DHCP4_CONFIG_DATA Config;
EFI_DHCP4_MODE_DATA Mode;
EFI_DHCP4_PACKET_OPTION *OptList[PXEBC_DHCP4_OPTION_MAX_NUM];
UINT8 Buffer[PXEBC_DHCP4_OPTION_MAX_SIZE];
UINT32 OptCount;
EFI_STATUS Status;
ASSERT (Dhcp4 != NULL);
Status = EFI_SUCCESS;
PxeMode = Private->PxeBc.Mode;
//
// Build option list for the request packet.
//
OptCount = PxeBcBuildDhcp4Options (Private, OptList, Buffer, FALSE);
ASSERT (OptCount > 0);
ZeroMem (&Mode, sizeof (EFI_DHCP4_MODE_DATA));
ZeroMem (&Config, sizeof (EFI_DHCP4_CONFIG_DATA));
Config.OptionCount = OptCount;
Config.OptionList = OptList;
Config.Dhcp4Callback = PxeBcDhcp4CallBack;
Config.CallbackContext = Private;
Config.DiscoverTryCount = PXEBC_DHCP_RETRIES;
Config.DiscoverTimeout = mPxeDhcpTimeout;
//
// Configure the DHCPv4 instance for PXE boot.
//
Status = Dhcp4->Configure (Dhcp4, &Config);
if (EFI_ERROR (Status)) {
goto ON_EXIT;
}
//
// Initialize the record fields for DHCPv4 offer in private data.
//
Private->IsProxyRecved = FALSE;
Private->OfferNum = 0;
ZeroMem (Private->OfferCount, sizeof (Private->OfferCount));
ZeroMem (Private->OfferIndex, sizeof (Private->OfferIndex));
Status = Dhcp4->Start (Dhcp4, NULL);
if (EFI_ERROR (Status)) {
if (Status == EFI_ICMP_ERROR) {
PxeMode->IcmpErrorReceived = TRUE;
}
if ((Status == EFI_TIMEOUT) && (Private->OfferNum > 0)) {
Status = EFI_NO_RESPONSE;
}
goto ON_EXIT;
}
//
// Get the acquired IPv4 address and store them.
//
Status = Dhcp4->GetModeData (Dhcp4, &Mode);
if (EFI_ERROR (Status)) {
goto ON_EXIT;
}
ASSERT (Mode.State == Dhcp4Bound);
CopyMem (&Private->StationIp, &Mode.ClientAddress, sizeof (EFI_IPv4_ADDRESS));
CopyMem (&Private->SubnetMask, &Mode.SubnetMask, sizeof (EFI_IPv4_ADDRESS));
CopyMem (&Private->GatewayIp, &Mode.RouterAddress, sizeof (EFI_IPv4_ADDRESS));
CopyMem (&PxeMode->StationIp, &Private->StationIp, sizeof (EFI_IPv4_ADDRESS));
CopyMem (&PxeMode->SubnetMask, &Private->SubnetMask, sizeof (EFI_IPv4_ADDRESS));
Status = PxeBcFlushStationIp (Private, &Private->StationIp, &Private->SubnetMask);
if (EFI_ERROR (Status)) {
goto ON_EXIT;
}
//
// Check the selected offer whether BINL retry is needed.
//
Status = PxeBcHandleDhcp4Offer (Private);
AsciiPrint ("\n Station IP address is ");
PxeBcShowIp4Addr (&Private->StationIp.v4);
AsciiPrint ("\n");
ON_EXIT:
if (EFI_ERROR (Status)) {
Dhcp4->Stop (Dhcp4);
Dhcp4->Configure (Dhcp4, NULL);
} else {
ZeroMem (&Config, sizeof (EFI_DHCP4_CONFIG_DATA));
Dhcp4->Configure (Dhcp4, &Config);
Private->IsAddressOk = TRUE;
}
return Status;
}