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audk/MdeModulePkg/Library/DxeNetLib/NetDebug.c

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/** @file
Copyright (c) 2005 - 2006, 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:
NetDebug.c
Abstract:
Network debug facility. The debug information is wrapped in
SYSLOG packets, then sent over SNP. This debug facility can't
be used by SNP. Apply caution when used in MNP and non-network
module because SNP is most likely not "thread safe". We assume
that the SNP supports the EHTERNET.
**/
#include <PiDxe.h>
#include <Protocol/SimpleNetwork.h>
#include <Library/BaseLib.h>
#include <Library/NetLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/PrintLib.h>
//
// Any error level digitally larger than mNetDebugLevelMax
// will be silently discarded.
//
UINTN mNetDebugLevelMax = NETDEBUG_LEVEL_ERROR;
UINT32 mSyslogPacketSeq = 0xDEADBEEF;
//
// You can change mSyslogDstMac mSyslogDstIp and mSyslogSrcIp
// here to direct the syslog packets to the syslog deamon. The
// default is broadcast to both the ethernet and IP.
//
UINT8 mSyslogDstMac [NET_ETHER_ADDR_LEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
UINT32 mSyslogDstIp = 0xffffffff;
UINT32 mSyslogSrcIp = 0;
UINT8 *
MonthName[] = {
"Jan",
"Feb",
"Mar",
"Apr",
"May",
"Jun",
"Jul",
"Aug",
"Sep",
"Oct",
"Nov",
"Dec"
};
/**
Locate the handles that support SNP, then open one of them
to send the syslog packets. The caller isn't required to close
the SNP after use because the SNP is opened by HandleProtocol.
None
@return The point to SNP if one is properly openned. Otherwise NULL
**/
EFI_SIMPLE_NETWORK_PROTOCOL *
SyslogLocateSnp (
VOID
)
{
EFI_SIMPLE_NETWORK_PROTOCOL *Snp;
EFI_STATUS Status;
EFI_HANDLE *Handles;
UINTN HandleCount;
UINTN Index;
//
// Locate the handles which has SNP installed.
//
Handles = NULL;
Status = gBS->LocateHandleBuffer (
ByProtocol,
&gEfiSimpleNetworkProtocolGuid,
NULL,
&HandleCount,
&Handles
);
if (EFI_ERROR (Status) || (HandleCount == 0)) {
return NULL;
}
//
// Try to open one of the ethernet SNP protocol to send packet
//
Snp = NULL;
for (Index = 0; Index < HandleCount; Index++) {
Status = gBS->HandleProtocol (
Handles[Index],
&gEfiSimpleNetworkProtocolGuid,
(VOID **) &Snp
);
if ((Status == EFI_SUCCESS) && (Snp != NULL) &&
(Snp->Mode->IfType == NET_IFTYPE_ETHERNET) &&
(Snp->Mode->MaxPacketSize >= NET_SYSLOG_PACKET_LEN)) {
break;
}
Snp = NULL;
}
gBS->FreePool (Handles);
return Snp;
}
/**
Transmit a syslog packet synchronously through SNP. The Packet
already has the ethernet header prepended. This function should
fill in the source MAC because it will try to locate a SNP each
time it is called to avoid the problem if SNP is unloaded.
This code snip is copied from MNP.
@param Packet The Syslog packet
@param Length The length of the packet
@retval EFI_DEVICE_ERROR Failed to locate a usable SNP protocol
@retval EFI_TIMEOUT Timeout happened to send the packet.
@retval EFI_SUCCESS Packet is sent.
**/
EFI_STATUS
SyslogSendPacket (
IN UINT8 *Packet,
IN UINT32 Length
)
{
EFI_SIMPLE_NETWORK_PROTOCOL *Snp;
ETHER_HEAD *Ether;
EFI_STATUS Status;
EFI_EVENT TimeoutEvent;
UINT8 *TxBuf;
Snp = SyslogLocateSnp ();
if (Snp == NULL) {
return EFI_DEVICE_ERROR;
}
Ether = (ETHER_HEAD *) Packet;
CopyMem (Ether->SrcMac, Snp->Mode->CurrentAddress.Addr, NET_ETHER_ADDR_LEN);
//
// Start the timeout event.
//
Status = gBS->CreateEvent (
EVT_TIMER,
TPL_NOTIFY,
NULL,
NULL,
&TimeoutEvent
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = gBS->SetTimer (TimeoutEvent, TimerRelative, NET_SYSLOG_TX_TIMEOUT);
if (EFI_ERROR (Status)) {
goto ON_EXIT;
}
for (;;) {
//
// Transmit the packet through SNP.
//
Status = Snp->Transmit (Snp, 0, Length, Packet, NULL, NULL, NULL);
if ((Status != EFI_SUCCESS) && (Status != EFI_NOT_READY)) {
Status = EFI_DEVICE_ERROR;
break;
}
//
// If Status is EFI_SUCCESS, the packet is put in the transmit queue.
// if Status is EFI_NOT_READY, the transmit engine of the network
// interface is busy. Both need to sync SNP.
//
TxBuf = NULL;
do {
//
// Get the recycled transmit buffer status.
//
Snp->GetStatus (Snp, NULL, (VOID **) &TxBuf);
if (!EFI_ERROR (gBS->CheckEvent (TimeoutEvent))) {
Status = EFI_TIMEOUT;
break;
}
} while (TxBuf == NULL);
if ((Status == EFI_SUCCESS) || (Status == EFI_TIMEOUT)) {
break;
}
//
// Status is EFI_NOT_READY. Restart the timer event and
// call Snp->Transmit again.
//
gBS->SetTimer (TimeoutEvent, TimerRelative, NET_SYSLOG_TX_TIMEOUT);
}
gBS->SetTimer (TimeoutEvent, TimerCancel, 0);
ON_EXIT:
gBS->CloseEvent (TimeoutEvent);
return Status;
}
/**
Compute checksum for a bulk of data. This code is copied from the
Netbuffer library.
@param Bulk Pointer to the data.
@param Len Length of the data, in bytes.
@retval UINT16 The computed checksum.
**/
UINT16
SyslogChecksum (
IN UINT8 *Bulk,
IN UINT32 Len
)
{
register UINT32 Sum;
Sum = 0;
while (Len > 1) {
Sum += *(UINT16 *) Bulk;
Bulk += 2;
Len -= 2;
}
//
// Add left-over byte, if any
//
if (Len > 0) {
Sum += *(UINT8 *) Bulk;
}
//
// Fold 32-bit sum to 16 bits
//
while (Sum >> 16) {
Sum = (Sum & 0xffff) + (Sum >> 16);
}
return (UINT16) ~Sum;
}
/**
Build a syslog packet, including the Ethernet/Ip/Udp headers
and user's message.
@param Buf The buffer to put the packet data
@param BufLen The lenght of the Buf
@param Level Syslog servity level
@param Module The module that generates the log
@param File The file that contains the current log
@param Line The line of code in the File that contains the
current log
@param Message The log message
@return The length of the syslog packet built.
**/
UINT32
SyslogBuildPacket (
UINT8 *Buf,
UINT32 BufLen,
UINT32 Level,
UINT8 *Module,
UINT8 *File,
UINT32 Line,
UINT8 *Message
)
{
ETHER_HEAD *Ether;
IP4_HEAD *Ip4;
EFI_UDP4_HEADER *Udp4;
EFI_TIME Time;
UINT32 Pri;
UINT32 Len;
//
// Fill in the Ethernet header. Leave alone the source MAC.
// SyslogSendPacket will fill in the address for us.
//
Ether = (ETHER_HEAD *) Buf;
CopyMem (Ether->DstMac, mSyslogDstMac, NET_ETHER_ADDR_LEN);
ZeroMem (Ether->SrcMac, NET_ETHER_ADDR_LEN);
Ether->EtherType = HTONS (0x0800); // IP protocol
Buf += sizeof (ETHER_HEAD);
BufLen -= sizeof (ETHER_HEAD);
//
// Fill in the IP header
//
Ip4 = (IP4_HEAD *) Buf;
Ip4->HeadLen = 5;
Ip4->Ver = 4;
Ip4->Tos = 0;
Ip4->TotalLen = 0;
Ip4->Id = (UINT16) mSyslogPacketSeq;
Ip4->Fragment = 0;
Ip4->Ttl = 16;
Ip4->Protocol = 0x11;
Ip4->Checksum = 0;
Ip4->Src = mSyslogSrcIp;
Ip4->Dst = mSyslogDstIp;
Buf += sizeof (IP4_HEAD);
BufLen -= sizeof (IP4_HEAD);
//
// Fill in the UDP header, Udp checksum is optional. Leave it zero.
//
Udp4 = (EFI_UDP4_HEADER*) Buf;
Udp4->SrcPort = HTONS (514);
Udp4->DstPort = HTONS (514);
Udp4->Length = 0;
Udp4->Checksum = 0;
Buf += sizeof (EFI_UDP4_HEADER);
BufLen -= sizeof (EFI_UDP4_HEADER);
//
// Build the syslog message body with <PRI> Timestamp machine module Message
//
Pri = ((NET_SYSLOG_FACILITY & 31) << 3) | (Level & 7);
gRT->GetTime (&Time, NULL);
//
// Use %a to format the ASCII strings, %s to format UNICODE strings
//
Len = 0;
Len += (UINT32) AsciiSPrint (
(CHAR8 *) Buf,
BufLen,
"<%d> %a %d %d:%d:%d ",
Pri,
MonthName [Time.Month-1],
Time.Day,
Time.Hour,
Time.Minute,
Time.Second
);
Len--;
Len += (UINT32) AsciiSPrint (
(CHAR8 *) (Buf + Len),
BufLen - Len,
"Tiano %a: %a (Line: %d File: %a)",
Module,
Message,
Line,
File
);
Len--;
//
// OK, patch the IP length/checksum and UDP length fields.
//
Len += sizeof (EFI_UDP4_HEADER);
Udp4->Length = HTONS ((UINT16) Len);
Len += sizeof (IP4_HEAD);
Ip4->TotalLen = HTONS ((UINT16) Len);
Ip4->Checksum = SyslogChecksum ((UINT8 *) Ip4, sizeof (IP4_HEAD));
return Len + sizeof (ETHER_HEAD);
}
/**
Allocate a buffer, then format the message to it. This is a
help function for the NET_DEBUG_XXX macros. The PrintArg of
these macros treats the variable length print parameters as a
single parameter, and pass it to the NetDebugASPrint. For
example, NET_DEBUG_TRACE ("Tcp", ("State transit to %a\n", Name))
if extracted to:
NetDebugOutput (
NETDEBUG_LEVEL_TRACE,
"Tcp",
__FILE__,
__LINE__,
NetDebugASPrint ("State transit to %a\n", Name)
)
This is exactly what we want.
@param Format The ASCII format string.
@param ... The variable length parameter whose format is
determined by the Format string.
@return The buffer containing the formatted message, or NULL if failed to
@return allocate memory.
**/
UINT8 *
NetDebugASPrint (
UINT8 *Format,
...
)
{
VA_LIST Marker;
UINT8 *Buf;
Buf = AllocatePool (NET_DEBUG_MSG_LEN);
if (Buf == NULL) {
return NULL;
}
VA_START (Marker, Format);
AsciiVSPrint ((CHAR8 *) Buf, NET_DEBUG_MSG_LEN, (CHAR8 *) Format, Marker);
VA_END (Marker);
return Buf;
}
/**
Output a debug message to syslog. This function will locate a
instance of SNP then send the message through it. Because it
isn't open the SNP BY_DRIVER, apply caution when using it.
@param Level The servity level of the message.
@param Module The Moudle that generates the log.
@param File The file that contains the log.
@param Line The exact line that contains the log.
@param Message The user message to log.
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory for the packet
@retval EFI_SUCCESS The log is discard because that it is more verbose
than the mNetDebugLevelMax. Or, it has been sent
out.
**/
EFI_STATUS
NetDebugOutput (
UINT32 Level,
UINT8 *Module,
UINT8 *File,
UINT32 Line,
UINT8 *Message
)
{
UINT8 *Packet;
UINT32 Len;
EFI_STATUS Status;
//
// Check whether the message should be sent out
//
if (Message == NULL) {
return EFI_OUT_OF_RESOURCES;
}
if (Level > mNetDebugLevelMax) {
Status = EFI_SUCCESS;
goto ON_EXIT;
}
//
// Allocate a maxium of 1024 bytes, the caller should ensure
// that the message plus the ethernet/ip/udp header is shorter
// than this
//
Packet = AllocatePool (NET_SYSLOG_PACKET_LEN);
if (Packet == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
//
// Build the message: Ethernet header + IP header + Udp Header + user data
//
Len = SyslogBuildPacket (
Packet,
NET_SYSLOG_PACKET_LEN,
Level,
Module,
File,
Line,
Message
);
mSyslogPacketSeq++;
Status = SyslogSendPacket (Packet, Len);
gBS->FreePool (Packet);
ON_EXIT:
gBS->FreePool (Message);
return Status;
}
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