/*****************************************************************************
Function:
static bool ARP_SendIfPkt(NET_CONFIG* pIf, uint16_t oper, uint32_t srcIP, uint32_t dstIP, MAC_ADDR* dstMAC)
Description:
Writes an ARP packet to the MAC using the interface pointer for src IP and MAC address.
Precondition:
None
Parameters:
Return Values:
true - The ARP packet was generated properly
false - otherwise
***************************************************************************/
static bool ARP_SendIfPkt(NET_CONFIG* pIf, uint16_t oper, uint32_t srcIP, uint32_t dstIP, MAC_ADDR* dstMAC)
{
ARP_PACKET packet;
TCPIP_MAC_HANDLE hMac;
packet.HardwareType = HW_ETHERNET;
packet.Protocol = ARP_IP;
packet.MACAddrLen = sizeof(MAC_ADDR);
packet.ProtocolLen = sizeof(IP_ADDR);
packet.Operation = oper;
packet.SenderMACAddr = pIf->MyMACAddr;
packet.SenderIPAddr.Val = srcIP;
packet.TargetMACAddr = *dstMAC;
packet.TargetIPAddr.Val = dstIP;
SwapARPPacket(&packet);
hMac = _TCPIPStackNetToMac(pIf);
if(!MACIsTxReady(hMac))
{
return false;
}
MACSetWritePtr(hMac, MACGetTxBaseAddr(hMac));
MACPutHeader(hMac, &packet.TargetMACAddr, ETHERTYPE_ARP, sizeof(packet));
MACPutArray(hMac, (uint8_t*)&packet, sizeof(packet));
MACFlush(hMac);
return true;
}
/*****************************************************************************
Function:
static bool ARPPut(ARP_PACKET* packet)
Description:
Writes an ARP packet to the MAC.
Precondition:
None
Parameters:
packet - A pointer to an ARP_PACKET structure with correct operation
and target preconfigured.
Return Values:
true - The ARP packet was generated properly
false - Not a possible return value
***************************************************************************/
static bool ARPPut(ARP_PACKET* packet)
{
while(!MACIsTxReady());
MACSetWritePtr(BASE_TX_ADDR);
packet->HardwareType = HW_ETHERNET;
packet->Protocol = ARP_IP;
packet->MACAddrLen = sizeof(MAC_ADDR);
packet->ProtocolLen = sizeof(IP_ADDR);
// packet->SenderMACAddr = AppConfig.MyMACAddr; // HI-TECH PICC-18 compiler can't handle this statement, use memcpy() as a workaround
memcpy(&packet->SenderMACAddr, (void*)&AppConfig.MyMACAddr, sizeof(packet->SenderMACAddr));
#ifdef STACK_USE_ZEROCONF_LINK_LOCAL
//packet->SenderIPAddr = AppConfig.MyIPAddr; /* Removed for ZCLL, SenderIPAddr should be filled in */
#else
packet->SenderIPAddr = AppConfig.MyIPAddr;
#endif
SwapARPPacket(packet);
MACPutHeader(&packet->TargetMACAddr, MAC_ARP, sizeof(*packet));
MACPutArray((uint8_t*)packet, sizeof(*packet));
MACFlush();
return true;
}
/*********************************************************************
* Function: void ARPPut(NODE_INFO* more, BYTE opCode)
*
* PreCondition: None
*
* Input: remote - Remote node info
* opCode - ARP op code to send
*
* Output: TRUE - The ARP packet was generated properly
* FALSE - Unable to allocate a TX buffer
*
* Side Effects: None
*
* Overview: None
*
* Note: None
********************************************************************/
BOOL ARPPut(NODE_INFO *remote, BYTE opCode)
{
ARP_PACKET packet;
BUFFER MyTxBuffer;
MyTxBuffer = MACGetTxBuffer(TRUE);
// Do not respond if there is no room to generate the ARP reply
if(MyTxBuffer == INVALID_BUFFER)
return FALSE;
MACSetTxBuffer(MyTxBuffer, 0);
packet.HardwareType = HW_ETHERNET;
packet.Protocol = ARP_IP;
packet.MACAddrLen = sizeof(MAC_ADDR);
packet.ProtocolLen = sizeof(IP_ADDR);
if ( opCode == ARP_REQUEST )
{
packet.Operation = ARP_OPERATION_REQ;
packet.TargetMACAddr.v[0] = 0xff;
packet.TargetMACAddr.v[1] = 0xff;
packet.TargetMACAddr.v[2] = 0xff;
packet.TargetMACAddr.v[3] = 0xff;
packet.TargetMACAddr.v[4] = 0xff;
packet.TargetMACAddr.v[5] = 0xff;
}
else
{
packet.Operation = ARP_OPERATION_RESP;
packet.TargetMACAddr = remote->MACAddr;
}
packet.SenderMACAddr = AppConfig.MyMACAddr;
packet.SenderIPAddr = AppConfig.MyIPAddr;
// Check to see if target is on same subnet, if not, find Gateway MAC.
// Once we get Gateway MAC, all access to remote host will go through Gateway.
if((packet.SenderIPAddr.Val ^ remote->IPAddr.Val) & AppConfig.MyMask.Val)
{
packet.TargetIPAddr = AppConfig.MyGateway;
}
else
packet.TargetIPAddr = remote->IPAddr;
SwapARPPacket(&packet);
MACPutHeader(&packet.TargetMACAddr, MAC_ARP, sizeof(packet));
//MACPutArray((int8*)&packet, sizeof(packet));
MACPutArray(&packet, sizeof(ARP_PACKET));
MACFlush();
return TRUE;
}
/*********************************************************************
* Function: BOOL ARPGet(NODE_INFO* remote, BYTE* opCode)
*
* PreCondition: ARP packet is ready in MAC buffer.
*
* Input: remote - Remote node info
* opCode - Buffer to hold ARP op code.
*
* Output: TRUE if a valid ARP packet was received.
* FALSE otherwise.
*
* Side Effects: None
*
* Overview: None
*
* Note: None
********************************************************************/
int1 ARPGet(NODE_INFO *remote, int8 *opCode)
{
ARP_PACKET packet;
//MACGetArray((int8*)&packet, sizeof(packet));
MACGetArray(&packet, sizeof(ARP_PACKET));
MACDiscardRx();
SwapARPPacket(&packet);
debug_arp("\r\nARP: HW:%LX PR:%LX ML:%U PL:%U O:%LX TI:%U.%U.%U.%U FI:%U.%U.%U.%U",
packet.HardwareType, packet.Protocol, packet.MACAddrLen, packet.ProtocolLen,
packet.Operation, packet.TargetIPAddr.v[0],packet.TargetIPAddr.v[1],
packet.TargetIPAddr.v[2],packet.TargetIPAddr.v[3],
packet.SenderIPAddr.v[0],packet.SenderIPAddr.v[1],packet.SenderIPAddr.v[2],packet.SenderIPAddr.v[3]);
if ( packet.HardwareType != HW_ETHERNET ||
packet.MACAddrLen != sizeof(MAC_ADDR) ||
packet.ProtocolLen != sizeof(IP_ADDR) )
return FALSE;
if ( packet.Operation == ARP_OPERATION_RESP )
*opCode = ARP_REPLY;
else if ( packet.Operation == ARP_OPERATION_REQ )
*opCode = ARP_REQUEST;
else
{
*opCode = ARP_UNKNOWN;
return FALSE;
}
if(packet.TargetIPAddr.Val == AppConfig.MyIPAddr.Val)
{
remote->MACAddr = packet.SenderMACAddr;
remote->IPAddr = packet.SenderIPAddr;
return TRUE;
}
else
return FALSE;
}
/*********************************************************************
* Function: BOOL ARPGet(NODE_INFO* remote, BYTE* opCode)
*
* PreCondition: ARP packet is ready in MAC buffer.
*
* Input: remote - Remote node info
* opCode - Buffer to hold ARP op code.
*
* Output: TRUE if a valid ARP packet was received.
* FALSE otherwise.
*
* Side Effects: None
*
* Overview: None
*
* Note: None
********************************************************************/
BOOL ARPGet(NODE_INFO *remote, BYTE *opCode)
{
ARP_PACKET packet;
MACGetArray((BYTE*)&packet, sizeof(packet));
MACDiscardRx();
SwapARPPacket(&packet);
if ( packet.HardwareType != HW_ETHERNET ||
packet.MACAddrLen != sizeof(MAC_ADDR) ||
packet.ProtocolLen != sizeof(IP_ADDR) )
{
return FALSE;
}
if ( packet.Operation == ARP_OPERATION_RESP )
{
*opCode = ARP_REPLY;
}
else if ( packet.Operation == ARP_OPERATION_REQ )
*opCode = ARP_REQUEST;
else
{
*opCode = ARP_UNKNOWN;
return FALSE;
}
if(packet.TargetIPAddr.Val == AppConfig.MyIPAddr.Val)
{
remote->MACAddr = packet.SenderMACAddr;
remote->IPAddr = packet.SenderIPAddr;
return TRUE;
}
else
return FALSE;
}
/*****************************************************************************
Function:
bool ARPProcess(void)
Summary:
Processes an incoming ARP packet.
Description:
Retrieves an ARP packet from the MAC buffer and determines if it is a
response to our request (in which case the ARP is resolved) or if it
is a request requiring our response (in which case we transmit one.)
Precondition:
ARP packet is ready in the MAC buffer.
Parameters:
None
Return Values:
true - All processing of this ARP packet is complete. Do not call
again until a new ARP packet is waiting in the RX buffer.
false - This function must be called again. More time is needed to
send an ARP response.
***************************************************************************/
bool ARPProcess(void)
{
ARP_PACKET packet;
static NODE_INFO Target;
#if defined(STACK_USE_AUTO_IP)
uint8_t i;
#endif
static enum
{
SM_ARP_IDLE = 0,
SM_ARP_REPLY
} smARP = SM_ARP_IDLE;
switch(smARP)
{
case SM_ARP_IDLE:
// Obtain the incoming ARP packet
MACGetArray((uint8_t*)&packet, sizeof(packet));
MACDiscardRx();
SwapARPPacket(&packet);
// Validate the ARP packet
if ( packet.HardwareType != HW_ETHERNET ||
packet.MACAddrLen != sizeof(MAC_ADDR) ||
packet.ProtocolLen != sizeof(IP_ADDR) )
{
return true;
}
#ifdef STACK_USE_ZEROCONF_LINK_LOCAL
ARPProcessRxPkt(&packet);
#endif
#ifdef STACK_USE_AUTO_IP
if (packet.SenderIPAddr.Val == AppConfig.MyIPAddr.Val)
{
AutoIPConflict(0);
return true;
}
#endif
// Handle incoming ARP responses
#ifdef STACK_CLIENT_MODE
if(packet.Operation == ARP_OPERATION_RESP)
{
/* #if defined(STACK_USE_AUTO_IP)
for (i = 0; i < NETWORK_INTERFACES; i++)
if (AutoIPConfigIsInProgress(i))
AutoIPConflict(i);
#endif*/
Cache.MACAddr = packet.SenderMACAddr;
Cache.IPAddr = packet.SenderIPAddr;
//putsUART("ARPProcess: SM_ARP_IDLE: ARP_OPERATION_RESP \r\n");
return true;
}
#endif
// Handle incoming ARP requests for our MAC address
if(packet.Operation == ARP_OPERATION_REQ)
{
if(packet.TargetIPAddr.Val != AppConfig.MyIPAddr.Val)
{
return true;
}
#ifdef STACK_USE_ZEROCONF_LINK_LOCAL
/* Fix for Loop-Back suppression:
* For ZCLL-Claim packets, host should not respond.
* Check Sender's MAC-address with own MAC-address and
* if it is matched, response will not be sent back. This
* was leading to flooding of ARP-answeres */
if(!memcmp (&packet.SenderMACAddr, &AppConfig.MyMACAddr, 6))
{
putsUART("Loopback answer suppressed \r\n");
return true;
}
#endif
#if defined(STACK_USE_AUTO_IP)
for (i = 0; i < NETWORK_INTERFACES; i++)
if (AutoIPConfigIsInProgress(i))
{
AutoIPConflict(i);
return true;
}
#endif
Target.IPAddr = packet.SenderIPAddr;
Target.MACAddr = packet.SenderMACAddr;
//putsUART("ARPProcess: SM_ARP_IDLE: ARP_OPERATION_REQ \r\n");
smARP = SM_ARP_REPLY;
}
// Do not break. If we get down here, we need to send a reply.
case SM_ARP_REPLY:
packet.Operation = ARP_OPERATION_RESP;
#if defined(STACK_USE_AUTO_IP)
if (AutoIPIsConfigured(0))
{
packet.TargetMACAddr.v[0] = 0xFF;
packet.TargetMACAddr.v[1] = 0xFF;
packet.TargetMACAddr.v[2] = 0xFF;
packet.TargetMACAddr.v[3] = 0xFF;
packet.TargetMACAddr.v[4] = 0xFF;
packet.TargetMACAddr.v[5] = 0xFF;
}
else
#endif
packet.TargetMACAddr = Target.MACAddr;
packet.TargetIPAddr = Target.IPAddr;
#ifdef STACK_USE_ZEROCONF_LINK_LOCAL
packet.SenderIPAddr = AppConfig.MyIPAddr;
#endif
//putsUART("ARPProcess: SM_ARP_REPLY \r\n");
// Send an ARP response to a previously received request
if(!ARPPut(&packet))
{
return false;
}
// Begin listening for ARP requests again
smARP = SM_ARP_IDLE;
break;
}
return true;
}
void AutoIPTasks(void)
{
BYTE i;
for (i = 0; i < NETWORK_INTERFACES; i++)
{
LoadState (i);
AutoIPClient.flags.bits.bCurrentLinkState = MACIsLinked();
if(AutoIPClient.flags.bits.bCurrentLinkState != AutoIPClient.flags.bits.bLastLinkState)
{
AutoIPClient.flags.bits.bLastLinkState = AutoIPClient.flags.bits.bCurrentLinkState;
if(!AutoIPClient.flags.bits.bCurrentLinkState)
{
AutoIPClient.flags.bits.bConfigureAutoIP = FALSE;
AutoIPClient.smAUTOIPState = SM_AUTOIP_DISABLED;
AppConfig.MyIPAddr.Val = AppConfig.DefaultIPAddr.Val;
AppConfig.MyMask.Val = AppConfig.DefaultMask.Val;
}
else
{
AutoIPClient.smAUTOIPState = SM_AUTOIP_INIT_RNG;
}
}
#if defined (STACK_USE_DHCP_CLIENT)
if (DHCPIsBound(i))
{
AutoIPClient.flags.bits.bConfigureAutoIP = FALSE;
AutoIPClient.smAUTOIPState = SM_AUTOIP_DISABLED;
AutoIPClient.flags.bits.bLastDHCPState = TRUE;
}
else
{
if (AutoIPClient.flags.bits.bLastDHCPState == TRUE)
{
if (AutoIPClient.flags.bits.bCurrentLinkState)
AutoIPClient.smAUTOIPState = SM_AUTOIP_INIT_RNG;
}
AutoIPClient.flags.bits.bLastDHCPState = FALSE;
}
#endif
if (AutoIPClient.flags.bits.gDisableAutoIP == TRUE)
{
AutoIPClient.flags.bits.bConfigureAutoIP = FALSE;
AutoIPClient.smAUTOIPState = SM_AUTOIP_DISABLED;
}
switch (AutoIPClient.smAUTOIPState)
{
// Default no-AutoIP case
case SM_AUTOIP_DISABLED:
break;
// Initializes the random number generator with a seed based on the MAC address
case SM_AUTOIP_INIT_RNG:
AutoIPRandSeed (((DWORD)AppConfig.MyMACAddr.v[0] + ((DWORD)AppConfig.MyMACAddr.v[1] << 8) + \
((DWORD)AppConfig.MyMACAddr.v[2] << 16) + ((DWORD)AppConfig.MyMACAddr.v[3] << 24) + \
((DWORD)AppConfig.MyMACAddr.v[4]) + ((DWORD)AppConfig.MyMACAddr.v[5] << 8)), i);
AutoIPClient.smAUTOIPState = SM_AUTOIP_CHECK_ADDRESS;
// Check the address to see if it's in use before we write it into AppConfig
case SM_AUTOIP_CHECK_ADDRESS:
if (AutoIPClient.flags.bits.checkAddress == FALSE)
{
AutoIPClient.flags.bits.checkAddress = TRUE;
AppConfig.MyMask.Val = 0x00000000;
// Generate a random IP address (based on the MAC address) to try and claim.
// Dynamic link-local addresses can fall within the range:
// 169.254.1.0 - 169.254.254.255
AutoIPClient.packet.TargetIPAddr.byte.MB = AutoIPRand(i) % 256;
AutoIPClient.packet.TargetIPAddr.byte.UB = (AutoIPRand(i) % 254) + 1;
AutoIPClient.packet.TargetIPAddr.word.LW = 0xFEA9;
ARPResolve (&AutoIPClient.packet.TargetIPAddr);
AutoIPClient.eventTime = TickGet();
}
if (!ARPIsResolved (&AutoIPClient.packet.TargetIPAddr, &AutoIPClient.packet.TargetMACAddr))
{
if (TickGet() - AutoIPClient.eventTime > TICK_SECOND)
{
AutoIPClient.smAUTOIPState = SM_AUTOIP_SETUP_MESSAGE;
}
}
else
{
AutoIPClient.flags.bits.checkAddress = FALSE;
}
break;
// Set up an ARP packet
case SM_AUTOIP_SETUP_MESSAGE:
AutoIPClient.flags.bits.checkAddress = FALSE;
// Set the bConfigureAutoIP flag- This flag will cause an AutoIP conflict
// if a response packet is received from the address we're trying to claim.
AutoIPClient.flags.bits.bConfigureAutoIP = TRUE;
// Configure the fields for a gratuitous ARP packet
AutoIPClient.packet.Operation = ARP_OPERATION_REQ;
AutoIPClient.packet.TargetMACAddr.v[0] = 0xff;
AutoIPClient.packet.TargetMACAddr.v[1] = 0xff;
AutoIPClient.packet.TargetMACAddr.v[2] = 0xff;
AutoIPClient.packet.TargetMACAddr.v[3] = 0xff;
AutoIPClient.packet.TargetMACAddr.v[4] = 0xff;
AutoIPClient.packet.TargetMACAddr.v[5] = 0xff;
AppConfig.MyIPAddr = AutoIPClient.packet.TargetIPAddr;
AppConfig.MyMask.Val = 0x0000FFFF;
memcpy(&AutoIPClient.packet.SenderMACAddr, (void*)&AppConfig.MyMACAddr, sizeof(AutoIPClient.packet.SenderMACAddr));
AutoIPClient.packet.HardwareType = HW_ETHERNET;
AutoIPClient.packet.Protocol = ARP_IP;
AutoIPClient.packet.MACAddrLen = sizeof(MAC_ADDR);
AutoIPClient.packet.ProtocolLen = sizeof(IP_ADDR);
AutoIPClient.packet.SenderIPAddr.Val = AutoIPClient.packet.TargetIPAddr.Val;
SwapARPPacket(&AutoIPClient.packet);
// Generate a random delay between 0 and 1 second
AutoIPClient.randomDelay = ((rand() % 20) * TICK_SECOND) / 20;
// Store the current time
AutoIPClient.eventTime = TickGet();
// Set the state to send the ARP packet
AutoIPClient.smAUTOIPState = SM_AUTOIP_GRATUITOUS_ARP1;
break;
// Send a gratuitous ARP packet to try and claim our address
case SM_AUTOIP_GRATUITOUS_ARP1:
case SM_AUTOIP_GRATUITOUS_ARP2:
case SM_AUTOIP_GRATUITOUS_ARP3:
// Check to ensure we've passed the delay time
if (TickGet() - AutoIPClient.eventTime > AutoIPClient.randomDelay)
{
// Store the new event time
AutoIPClient.eventTime = TickGet();
// Generate a new random delay between 1 and 2 seconds
AutoIPClient.randomDelay = TICK_SECOND + (((rand() % 20) * TICK_SECOND) / 20);
// Transmit the packet
while(!MACIsTxReady());
MACSetWritePtr(BASE_TX_ADDR);
MACPutHeader(&AutoIPClient.packet.TargetMACAddr, MAC_ARP, sizeof(AutoIPClient.packet));
MACPutArray((BYTE*)&AutoIPClient.packet, sizeof(AutoIPClient.packet));
MACFlush();
// Increment the probe iteration or increment to the delay state
AutoIPClient.smAUTOIPState++;
}
break;
// Delay for 1-2 seconds after sending the third ARP request before
// entering the configured state
case SM_AUTOIP_DELAY:
if (TickGet() - AutoIPClient.eventTime > AutoIPClient.randomDelay)
AutoIPClient.smAUTOIPState = SM_AUTOIP_CONFIGURED;
break;
// Configure the module to limit the rate at which packets are sent
case SM_AUTOIP_RATE_LIMIT_SET:
AutoIPClient.eventTime = TickGet();
AppConfig.MyIPAddr.v[0] = MY_DEFAULT_IP_ADDR_BYTE1;
AppConfig.MyIPAddr.v[1] = MY_DEFAULT_IP_ADDR_BYTE2;
AppConfig.MyIPAddr.v[2] = MY_DEFAULT_IP_ADDR_BYTE3;
AppConfig.MyIPAddr.v[3] = MY_DEFAULT_IP_ADDR_BYTE4;
AutoIPClient.smAUTOIPState = SM_AUTOIP_RATE_LIMIT_WAIT;
break;
// Ensure that we don't try more than one address every 60 seconds
case SM_AUTOIP_RATE_LIMIT_WAIT:
if (TickGet() - AutoIPClient.eventTime > TICK_SECOND * 60)
AutoIPClient.smAUTOIPState = SM_AUTOIP_CHECK_ADDRESS;
break;
// Configured state
case SM_AUTOIP_CONFIGURED:
AutoIPClient.flags.bits.bConfigureAutoIP = FALSE;
break;
// Address defense state
case SM_AUTOIP_DEFEND:
// Prepare and send an ARP response
AutoIPClient.packet.Operation = ARP_OPERATION_RESP;
AutoIPClient.packet.HardwareType = HW_ETHERNET;
AutoIPClient.packet.Protocol = ARP_IP;
SwapARPPacket(&AutoIPClient.packet);
while(!MACIsTxReady());
MACSetWritePtr(BASE_TX_ADDR);
MACPutHeader(&AutoIPClient.packet.TargetMACAddr, MAC_ARP, sizeof(AutoIPClient.packet));
MACPutArray((BYTE*)&AutoIPClient.packet, sizeof(AutoIPClient.packet));
MACFlush();
AutoIPClient.smAUTOIPState = SM_AUTOIP_CONFIGURED;
break;
}
}
}
/*********************************************************************
* Function: void ARPPut(NODE_INFO* more, BYTE opCode)
*
* PreCondition: MACIsTxReady() == TRUE
*
* Input: remote - Remote node info
* opCode - ARP op code to send
*
* Output: None
*
* Side Effects: None
*
* Overview: None
*
* Note: None
********************************************************************/
void ARPPut(NODE_INFO *remote,
BYTE opCode)
{
ARP_PACKET packet;
packet.HardwareType = HW_ETHERNET;
packet.Protocol = ARP_IP;
packet.MACAddrLen = sizeof(MAC_ADDR);
packet.ProtocolLen = sizeof(IP_ADDR);
if ( opCode == ARP_REQUEST )
{
packet.Operation = ARP_OPERATION_REQ;
packet.TargetMACAddr.v[0] = 0xff;
packet.TargetMACAddr.v[1] = 0xff;
packet.TargetMACAddr.v[2] = 0xff;
packet.TargetMACAddr.v[3] = 0xff;
packet.TargetMACAddr.v[4] = 0xff;
packet.TargetMACAddr.v[5] = 0xff;
}
else
{
packet.Operation = ARP_OPERATION_RESP;
packet.TargetMACAddr = remote->MACAddr;
}
packet.SenderMACAddr.v[0] = MY_MAC_BYTE1;
packet.SenderMACAddr.v[1] = MY_MAC_BYTE2;
packet.SenderMACAddr.v[2] = MY_MAC_BYTE3;
packet.SenderMACAddr.v[3] = MY_MAC_BYTE4;
packet.SenderMACAddr.v[4] = MY_MAC_BYTE5;
packet.SenderMACAddr.v[5] = MY_MAC_BYTE6;
packet.SenderIPAddr.v[0] = MY_IP_BYTE1;
packet.SenderIPAddr.v[1] = MY_IP_BYTE2;
packet.SenderIPAddr.v[2] = MY_IP_BYTE3;
packet.SenderIPAddr.v[3] = MY_IP_BYTE4;
/*
* Check to see if target is on same subnet, if not, find
* Gateway MAC.
* Once we get Gateway MAC, all access to remote host will
* go through Gateway.
*/
if (((packet.SenderIPAddr.v[0] ^ remote->IPAddr.v[0]) &
MY_MASK_BYTE1) ||
((packet.SenderIPAddr.v[1] ^ remote->IPAddr.v[1]) &
MY_MASK_BYTE2) ||
((packet.SenderIPAddr.v[2] ^ remote->IPAddr.v[2]) &
MY_MASK_BYTE3) ||
((packet.SenderIPAddr.v[3] ^ remote->IPAddr.v[3]) &
MY_MASK_BYTE4) )
{
packet.TargetIPAddr.v[0] = MY_GATE_BYTE1;
packet.TargetIPAddr.v[1] = MY_GATE_BYTE2;
packet.TargetIPAddr.v[2] = MY_GATE_BYTE3;
packet.TargetIPAddr.v[3] = MY_GATE_BYTE4;
}
else
packet.TargetIPAddr = remote->IPAddr;
SwapARPPacket(&packet);
MACPutHeader(&packet.TargetMACAddr, MAC_ARP, sizeof(packet));
MACPutArray((BYTE*)&packet, sizeof(packet));
MACFlush();
}
/*****************************************************************************
Function:
ARP_RESULT ARPProcess(NET_CONFIG* pIf)
Summary:
Processes an incoming ARP packet.
Description:
Retrieves an ARP packet from the MAC buffer and determines if it is a
response to our request (in which case the ARP is resolved) or if it
is a request requiring our response (in which case we transmit one.)
Precondition:
ARP packet is ready in the MAC buffer.
Parameters:
None
Return Values:
ARP_RES_OK - processing OK.
ARP_RES_error - some error occurred
***************************************************************************/
ARP_RESULT ARPProcess(NET_CONFIG* pIf)
{
ARP_PACKET packet;
MAC_ADDR *dstMAC;
OA_HASH_ENTRY *hE;
ARP_CACHE_DCPT *pArpDcpt;
int netIx;
TCPIP_MAC_HANDLE hMac;
ARP_RESULT arpReqRes;
netIx = _TCPIPStackNetIx(pIf);
pArpDcpt = arpCache + netIx;
hMac = _TCPIPStackNetToMac(pIf);
// Obtain the incoming ARP packet and process
MACGetArray(hMac, (uint8_t*)&packet, sizeof(packet));
MACDiscardRx(hMac);
SwapARPPacket(&packet);
// Validate the ARP packet
if ( packet.HardwareType != HW_ETHERNET ||
packet.MACAddrLen != sizeof(MAC_ADDR) ||
packet.ProtocolLen != sizeof(IP_ADDR) )
{
return ARP_RES_OK;
}
#ifdef TCPIP_STACK_USE_ZEROCONF_LINK_LOCAL
ARPProcessRxPkt(pIf, &packet);
#endif
arpReqRes = ARP_RES_OK;
// Handle incoming ARP packet
hE = OAHashLookUp(pArpDcpt->cacheDcpt, &packet.SenderIPAddr.Val);
if(hE != 0)
{ // we already have this sender and we should update it
_ARPUpdateEntry(pIf, (ARP_HASH_ENTRY*)hE, &packet.SenderMACAddr);
}
while(packet.TargetIPAddr.Val == pIf->MyIPAddr.Val)
{ // we are the target and we should add to cache anyway
if(hE == 0)
{ // not there yet
arpReqRes = _ARPAddCompleteEntry(pIf, &packet.SenderIPAddr, &packet.SenderMACAddr);
}
// Handle incoming ARP operation
if(packet.Operation == ARP_OPERATION_REQ)
{
// ARP packet asking for this host IP address
#ifdef TCPIP_STACK_USE_ZEROCONF_LINK_LOCAL
/* Fix for Loop-Back suppression:
* For ZCLL-Claim packets, host should not respond.
* Check Sender's MAC-address with own MAC-address and
* if it is matched, response will not be sent back. This
* was leading to flooding of ARP-answeres */
if(!memcmp (&packet.SenderMACAddr, &pIf->MyMACAddr, 6))
{
SYS_CONSOLE_MESSAGE("Loopback answer suppressed \r\n");
break;
}
#endif
#if defined(TCPIP_STACK_USE_AUTO_IP)
if ((packet.SenderIPAddr.Val == pIf->MyIPAddr.Val) || AutoIPConfigIsInProgress(pIf))
{
AutoIPConflict(pIf);
break;
}
#endif
// Need to send a reply to the requestor
#if defined(TCPIP_STACK_USE_AUTO_IP)
if (AutoIPIsConfigured(pIf))
{
dstMAC = &arpBcastAdd;
}
else
#endif
{
dstMAC = &packet.SenderMACAddr;
}
// Send an ARP response to the received request
if(!ARP_SendIfPkt(pIf, ARP_OPERATION_RESP, (uint32_t)pIf->MyIPAddr.Val, (uint32_t)packet.SenderIPAddr.Val, dstMAC))
{
arpReqRes = ARP_RES_TX_FAILED;
}
}
break;
}
return arpReqRes;
}
void AutoIPTasks(NET_CONFIG* pConfig)
{
// uint8_t i;
TCPIP_MAC_HANDLE hMac;
// for (i = 0; i < NETWORK_INTERFACES; i++)
{
LoadState(_TCPIPStackNetIx(pConfig));
hMac = _TCPIPStackNetToMac(pConfig);
AutoIPClient.flags.bits.bCurrentLinkState = MACIsLinked(hMac);
if(AutoIPClient.flags.bits.bCurrentLinkState != AutoIPClient.flags.bits.bLastLinkState)
{
AutoIPClient.flags.bits.bLastLinkState = AutoIPClient.flags.bits.bCurrentLinkState;
if(!AutoIPClient.flags.bits.bCurrentLinkState)
{
AutoIPClient.flags.bits.bConfigureAutoIP = false;
AutoIPClient.smAUTOIPState = SM_AUTOIP_DISABLED;
pConfig->MyIPAddr.Val = pConfig->DefaultIPAddr.Val;
pConfig->MyMask.Val = pConfig->DefaultMask.Val;
}
else
{
AutoIPClient.smAUTOIPState = SM_AUTOIP_INIT_RNG;
}
}
#if defined (TCPIP_STACK_USE_DHCP_CLIENT)
if (DHCPIsBound(pConfig))
{
AutoIPClient.flags.bits.bConfigureAutoIP = false;
AutoIPClient.smAUTOIPState = SM_AUTOIP_DISABLED;
AutoIPClient.flags.bits.bLastDHCPState = true;
}
else
{
if (AutoIPClient.flags.bits.bLastDHCPState == true)
{
if (AutoIPClient.flags.bits.bCurrentLinkState)
AutoIPClient.smAUTOIPState = SM_AUTOIP_INIT_RNG;
}
AutoIPClient.flags.bits.bLastDHCPState = false;
}
#endif
if (AutoIPClient.flags.bits.gDisableAutoIP == true)
{
AutoIPClient.flags.bits.bConfigureAutoIP = false;
AutoIPClient.smAUTOIPState = SM_AUTOIP_DISABLED;
}
switch (AutoIPClient.smAUTOIPState)
{
// Default no-AutoIP case
case SM_AUTOIP_DISABLED:
break;
// Initializes the random number generator with a seed based on the MAC address
case SM_AUTOIP_INIT_RNG:
AutoIPRandSeed (((uint32_t)pConfig->MyMACAddr.v[0] + ((uint32_t)pConfig->MyMACAddr.v[1] << 8) + \
((uint32_t)pConfig->MyMACAddr.v[2] << 16) + ((uint32_t)pConfig->MyMACAddr.v[3] << 24) + \
((uint32_t)pConfig->MyMACAddr.v[4]) + ((uint32_t)pConfig->MyMACAddr.v[5] << 8)), pConfig);
AutoIPClient.smAUTOIPState = SM_AUTOIP_CHECK_ADDRESS;
// Check the address to see if it's in use before we write it into NetConfig
case SM_AUTOIP_CHECK_ADDRESS:
if (AutoIPClient.flags.bits.checkAddress == false)
{
AutoIPClient.flags.bits.checkAddress = true;
pConfig->MyMask.Val = 0x00000000;
// Generate a random IP address (based on the MAC address) to try and claim.
// Dynamic link-local addresses can fall within the range:
// 169.254.1.0 - 169.254.254.255
AutoIPClient.packet.TargetIPAddr.byte.MB = AutoIPRand(pConfig) % 256;
AutoIPClient.packet.TargetIPAddr.byte.UB = (AutoIPRand(pConfig) % 254) + 1;
AutoIPClient.packet.TargetIPAddr.word.LW = 0xFEA9;
ARPResolve (pConfig, &AutoIPClient.packet.TargetIPAddr);
AutoIPClient.eventTime = SYS_TICK_Get();
}
if (!ARPIsResolved (pConfig, &AutoIPClient.packet.TargetIPAddr, &AutoIPClient.packet.TargetMACAddr))
{
if (SYS_TICK_Get() - AutoIPClient.eventTime > SYS_TICK_TicksPerSecondGet())
{
AutoIPClient.smAUTOIPState = SM_AUTOIP_SETUP_MESSAGE;
}
}
else
{
AutoIPClient.flags.bits.checkAddress = false;
}
break;
// Set up an ARP packet
case SM_AUTOIP_SETUP_MESSAGE:
AutoIPClient.flags.bits.checkAddress = false;
// Set the bConfigureAutoIP flag- This flag will cause an AutoIP conflict
// if a response packet is received from the address we're trying to claim.
AutoIPClient.flags.bits.bConfigureAutoIP = true;
// Configure the fields for a gratuitous ARP packet
AutoIPClient.packet.Operation = ARP_OPERATION_REQ;
AutoIPClient.packet.TargetMACAddr.v[0] = 0xff;
AutoIPClient.packet.TargetMACAddr.v[1] = 0xff;
AutoIPClient.packet.TargetMACAddr.v[2] = 0xff;
AutoIPClient.packet.TargetMACAddr.v[3] = 0xff;
AutoIPClient.packet.TargetMACAddr.v[4] = 0xff;
AutoIPClient.packet.TargetMACAddr.v[5] = 0xff;
pConfig->MyIPAddr = AutoIPClient.packet.TargetIPAddr;
pConfig->MyMask.Val = 0x0000FFFF;
memcpy(&AutoIPClient.packet.SenderMACAddr, (void*)&pConfig->MyMACAddr, sizeof(AutoIPClient.packet.SenderMACAddr));
AutoIPClient.packet.HardwareType = HW_ETHERNET;
AutoIPClient.packet.Protocol = ARP_IP;
AutoIPClient.packet.MACAddrLen = sizeof(MAC_ADDR);
AutoIPClient.packet.ProtocolLen = sizeof(IP_ADDR);
AutoIPClient.packet.SenderIPAddr.Val = AutoIPClient.packet.TargetIPAddr.Val;
SwapARPPacket(&AutoIPClient.packet);
// Generate a random delay between 0 and 1 second
AutoIPClient.randomDelay = ((LFSRRand() % 20) * SYS_TICK_TicksPerSecondGet()) / 20;
// Store the current time
AutoIPClient.eventTime = SYS_TICK_Get();
// Set the state to send the ARP packet
AutoIPClient.smAUTOIPState = SM_AUTOIP_GRATUITOUS_ARP1;
break;
// Send a gratuitous ARP packet to try and claim our address
case SM_AUTOIP_GRATUITOUS_ARP1:
case SM_AUTOIP_GRATUITOUS_ARP2:
case SM_AUTOIP_GRATUITOUS_ARP3:
// Check to ensure we've passed the delay time
if (SYS_TICK_Get() - AutoIPClient.eventTime > AutoIPClient.randomDelay)
{
if(!MACIsTxReady(hMac))
{
break;
}
// Store the new event time
AutoIPClient.eventTime = SYS_TICK_Get();
// Generate a new random delay between 1 and 2 seconds
AutoIPClient.randomDelay = SYS_TICK_TicksPerSecondGet() + (((LFSRRand() % 20) * SYS_TICK_TicksPerSecondGet()) / 20);
// Transmit the packet
MACSetWritePtr(hMac, MACGetTxBaseAddr(hMac));
MACPutHeader(hMac, &AutoIPClient.packet.TargetMACAddr, ETHERTYPE_ARP, sizeof(AutoIPClient.packet));
MACPutArray(hMac, (uint8_t*)&AutoIPClient.packet, sizeof(AutoIPClient.packet));
MACFlush(hMac);
// Increment the probe iteration or increment to the delay state
AutoIPClient.smAUTOIPState++;
}
break;
// Delay for 1-2 seconds after sending the third ARP request before
// entering the configured state
case SM_AUTOIP_DELAY:
if (SYS_TICK_Get() - AutoIPClient.eventTime > AutoIPClient.randomDelay)
AutoIPClient.smAUTOIPState = SM_AUTOIP_CONFIGURED;
break;
// Configure the module to limit the rate at which packets are sent
case SM_AUTOIP_RATE_LIMIT_SET:
AutoIPClient.eventTime = SYS_TICK_Get();
pConfig->MyIPAddr.Val = pConfig->DefaultIPAddr.Val;
AutoIPClient.smAUTOIPState = SM_AUTOIP_RATE_LIMIT_WAIT;
break;
// Ensure that we don't try more than one address every 60 seconds
case SM_AUTOIP_RATE_LIMIT_WAIT:
if (SYS_TICK_Get() - AutoIPClient.eventTime > SYS_TICK_TicksPerSecondGet() * 60)
AutoIPClient.smAUTOIPState = SM_AUTOIP_CHECK_ADDRESS;
break;
// Configured state
case SM_AUTOIP_CONFIGURED:
AutoIPClient.flags.bits.bConfigureAutoIP = false;
break;
// Address defense state
case SM_AUTOIP_DEFEND:
// Prepare and send an ARP response
if(!MACIsTxReady(hMac))
{
break;
}
AutoIPClient.packet.Operation = ARP_OPERATION_RESP;
AutoIPClient.packet.HardwareType = HW_ETHERNET;
AutoIPClient.packet.Protocol = ARP_IP;
SwapARPPacket(&AutoIPClient.packet);
MACSetWritePtr(hMac, MACGetTxBaseAddr(hMac));
MACPutHeader(hMac, &AutoIPClient.packet.TargetMACAddr, ETHERTYPE_ARP, sizeof(AutoIPClient.packet));
MACPutArray(hMac, (uint8_t*)&AutoIPClient.packet, sizeof(AutoIPClient.packet));
MACFlush(hMac);
AutoIPClient.smAUTOIPState = SM_AUTOIP_CONFIGURED;
break;
}
}
}
