static void _ZCLLDisable(TCPIP_NET_IF* pNetIf)
{
ZCLL_NET_HANDLE *hZcll;
hZcll = (phZCLL+TCPIP_STACK_NetIxGet(pNetIf));
TCPIP_ARP_CallbacksDeregister(hZcll->arpRegId);
hZcll->zcll_state = SM_INIT; // stop the ZCLL state machine
pNetIf->Flags.bIsZcllEnabled = false;
}
static bool _ZCLLEnable(TCPIP_NET_IF* pNetIf)
{
ZCLL_NET_HANDLE* hZcll;
hZcll = (phZCLL+TCPIP_STACK_NetIxGet(pNetIf));
hZcll->arpRegId = TCPIP_ARP_CallbacksRegister(&callbacks);
if(hZcll->arpRegId <0)
{
hZcll->zcll_state = SM_INIT; // should already be in idle state
SYS_ERROR(SYS_ERROR_ERROR, "_ZCLLEnable: ARP registration Failed!!! \r\n");
return false;
}
pNetIf->Flags.bIsZcllEnabled = true;
hZcll->zcll_state = SM_ADDR_INIT;
return true;
}
/***************************************************************
Function:
static void _ZeroconfARPPktNotify ( TCPIP_NET_IF* pNetIf
,uint32_t SenderIPAddr
,uint32_t TargetIPAddr
,TCPIP_MAC_ADDR* SenderMACAddr
,TCPIP_MAC_ADDR* TargetMACAddr
,uint8_t op_req)
Summary:
Callback registered with ARP-Module. This gets invoked from ARP-
module and runs in the same context.
Description:
This function is registered as a callback with ARP-module to get
notified about incoming Packet-events. Based on the type of packet
received and Link-Local current state, appropriate action will be
taken. To find the type of ARP-Packet this function makes use of
_FindARPPktType routine.
Primary purpose of this function is to decipher the ARP-Packet rxed
and check whether its leading to a conflict with the selected IP-
address.
Two types of conflicts are defined: Probe-Conflict and Late-Conflict
If the current state of Link-Local is Probe/Claim and a conflict is
detected its called "Probe-Conflict"
If the current state of Link-Local is Defend-state and a conflict is
detected its called "Late-Conflict"
Parameters:
SenderIPAddr - Sender IP-Address
TargetIPAddr - Target IP-Address
SenderMACAddr - Sender MAC-Address
TargetMACAddr - Target MAC-Address
op_req - Operation-Request (ARP-Request/Response)
Returns:
None
***************************************************************/
static void _ZeroconfARPPktNotify ( TCPIP_NET_IF* pNetIf
,uint32_t SenderIPAddr
,uint32_t TargetIPAddr
,TCPIP_MAC_ADDR* SenderMACAddr
,TCPIP_MAC_ADDR* TargetMACAddr
,uint8_t op_req)
{
ARP_PKT_TYPE pkt_type;
ZCLL_NET_HANDLE *hZcll;
int i;
pkt_type = _FindARPPktType (SenderIPAddr, TargetIPAddr, op_req);
if(pkt_type == UNKNOWN_TYPE)
return; // Can't hit this
i = TCPIP_STACK_NetIxGet(pNetIf);
hZcll =(phZCLL+i);
switch (hZcll->zcll_state)
{
case SM_ADDR_PROBE:
case SM_ADDR_CLAIM:
{
switch(pkt_type)
{
case ARP_PROBE_TYPE:
case ARP_CLAIM_TYPE:
case ARP_DEFEND_TYPE:
if(hZcll->temp_IP_addr.Val == TargetIPAddr ) // Probe-Conflict
{
if(memcmp(SenderMACAddr, &pNetIf->netMACAddr.v, 6))
{
hZcll->zcll_flags.probe_conflict =1;
}
}
break;
case ARP_RESPONSE_TYPE:
/* Some-body has been using probed addr
* We need to choose different Address */
if(hZcll->temp_IP_addr.Val == SenderIPAddr)
{
INFO_ZCLL_PRINT("IP address conflict. Please wait...\r\n");
hZcll->zcll_flags.probe_conflict =1;
}
break;
default:
break;
}
}
break;
case SM_ADDR_DEFEND:
if(pNetIf->netIPAddr.Val == SenderIPAddr)
{
if(memcmp(SenderMACAddr, &pNetIf->netMACAddr, 6))
{
INFO_ZCLL_PRINT("Zero Conf is defending the IP address\r\n");
hZcll->zcll_flags.late_conflict = 1;
}
}
break;
default:
break; // Nothing to do in other states
}
}
/*********************************************************************
* Function: bool TCPIP_ANNOUNCE_Task(void)
*
* Summary: Announce callback task.
*
* PreCondition: Stack is initialized()
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: Recurring task used to listen for Discovery
* messages on the specified TCPIP_ANNOUNCE_PORT. These
* messages can be sent using the TCP/IP
* Discoverer tool. If one is received, this
* function will transmit a reply.
*
* Note: A UDP socket must be available before this
* function is called. It is freed at the end of
* the function. UDP_MAX_SOCKETS may need to be
* increased if other modules use UDP sockets.
********************************************************************/
bool TCPIP_ANNOUNCE_Task(TCPIP_NET_IF * pNetIf)
{
uint8_t i;
int netIx;
UDP_SOCKET s;
if(!pNetIf)
{
return false;
}
else
{
netIx = TCPIP_STACK_NetIxGet(pNetIf);
}
s = announceDcpt.skt;
switch(announceDcpt.sm)
{
case DISCOVERY_HOME:
// Open a UDP socket for inbound and outbound transmission
// Allow receive on any interface
s = TCPIP_UDP_ServerOpen(IP_ADDRESS_TYPE_IPV4, TCPIP_ANNOUNCE_PORT, 0);
if(s == INVALID_UDP_SOCKET)
{
return false;
}
if(!TCPIP_UDP_RemoteBind(s, IP_ADDRESS_TYPE_IPV4, TCPIP_ANNOUNCE_PORT, 0))
{
TCPIP_UDP_Close(s);
break;
}
if(!TCPIP_UDP_OptionsSet(s, UDP_OPTION_STRICT_PORT, (void*)true))
{
TCPIP_UDP_Close(s);
break;
}
announceDcpt.skt = s;
announceDcpt.sm++;
break;
case DISCOVERY_LISTEN:
// Do nothing if no data is waiting
if(!TCPIP_UDP_GetIsReady(s))
return false;
// See if this is a discovery query or reply
TCPIP_UDP_Get(s, &i);
TCPIP_UDP_Discard(s);
if(i != 'D')
return false;
// We received a discovery request, reply when we can
announceDcpt.sm++;
// No break needed. If we get down here, we are now ready for the DISCOVERY_REQUEST_RECEIVED state
case DISCOVERY_REQUEST_RECEIVED:
ANNOUNCE_Notify (pNetIf, DHCP_EVENT_BOUND, NULL); // fake a legitimate DHCP event
// Listen for other discovery requests
announceDcpt.sm = DISCOVERY_LISTEN;
break;
case DISCOVERY_DISABLED:
break;
}
return true;
}