error_t statelessAddrConfig(NetInterface *interface)
{
error_t error;
Eui64 interfaceId;
Ipv6Addr linkLocalAddr;
Ipv6Addr solicitedNodeAddr;
//Generate the 64-bit interface identifier
macAddrToEui64(&interface->macAddr, &interfaceId);
//A link-local address is formed by combining the well-known
//link-local prefix fe80::0 with the interface identifier
linkLocalAddr.w[0] = htons(0xFE80);
linkLocalAddr.w[1] = htons(0x0000);
linkLocalAddr.w[2] = htons(0x0000);
linkLocalAddr.w[3] = htons(0x0000);
linkLocalAddr.w[4] = interfaceId.w[0];
linkLocalAddr.w[5] = interfaceId.w[1];
linkLocalAddr.w[6] = interfaceId.w[2];
linkLocalAddr.w[7] = interfaceId.w[3];
//Form the Solicited-Node address
ipv6ComputeSolicitedNodeAddr(&linkLocalAddr, &solicitedNodeAddr);
//Join the Solicited-Node multicast group for the tentative address
ipv6JoinMulticastGroup(interface, &solicitedNodeAddr);
//Ensure that the address is not already in use on the local network
error = slaacDetectDuplicateAddr(&linkLocalAddr);
//If a duplicate address is discovered during the procedure,
//the address cannot be assigned to the interface
if(error)
{
ipv6LeaveMulticastGroup(interface, &solicitedNodeAddr);
return error;
}
//Assign the link-local address to the local IPv6 address
interface->ipv6Config.linkLocalAddr = linkLocalAddr;
//The node next attempts to contact a local router for more
//information on continuing the configuration
//The global address is formed by appending the interface
//identifier to a prefix of appropriate length
//Successful configuration
return NO_ERROR;
}
void slaacProcessRouterAdv(SlaacContext *context,
const Ipv6Addr *srcAddr, NdpRouterAdvMessage *message, size_t length)
{
uint_t i;
uint_t n;
NdpPrefixInfoOption *prefixInfoOption;
NdpRdnssOption *rdnssOption;
Eui64 interfaceId;
Ipv6Addr globalAddr;
//Check current state
if(context->state != SLAAC_STATE_ROUTER_SOLICIT)
return;
//Save router address
ipv6SetRouter(context->interface, srcAddr);
//Calculate the length of the Options field
length -= sizeof(NdpRouterAdvMessage);
//Search for the Prefix Information option
prefixInfoOption = ndpGetOption(message->options, length, NDP_OPT_PREFIX_INFORMATION);
//Prefix Information option not found?
if(prefixInfoOption == NULL || prefixInfoOption->length != 4)
return;
//If the Autonomous flag is not set, silently ignore the Prefix
//Information option
if(!prefixInfoOption->a)
return;
//If the prefix is the link-local prefix, silently ignore the
//Prefix Information option
if(ipv6CompPrefix(&prefixInfoOption->prefix, &IPV6_LINK_LOCAL_ADDR_PREFIX, 64))
return;
//If the preferred lifetime is greater than the valid lifetime,
//silently ignore the Prefix Information option
if(prefixInfoOption->preferredLifetime > prefixInfoOption->validLifetime)
return;
//If the sum of the prefix length and interface identifier length does
//not equal 128 bits, the Prefix Information option must be ignored
if(prefixInfoOption->prefixLength != 64)
return;
//Save IPv6 prefix
ipv6SetPrefix(context->interface, &prefixInfoOption->prefix,
prefixInfoOption->prefixLength);
//Generate the 64-bit interface identifier
macAddrToEui64(&context->interface->macAddr, &interfaceId);
//Form an address by combining the advertised prefix
//with the interface identifier
globalAddr.w[0] = prefixInfoOption->prefix.w[0];
globalAddr.w[1] = prefixInfoOption->prefix.w[1];
globalAddr.w[2] = prefixInfoOption->prefix.w[2];
globalAddr.w[3] = prefixInfoOption->prefix.w[3];
globalAddr.w[4] = interfaceId.w[0];
globalAddr.w[5] = interfaceId.w[1];
globalAddr.w[6] = interfaceId.w[2];
globalAddr.w[7] = interfaceId.w[3];
//Use the global address as a tentative address
ipv6SetGlobalAddr(context->interface, &globalAddr, IPV6_ADDR_STATE_TENTATIVE);
//Use the DNS servers provided by the router?
if(!context->manualDnsConfig)
{
//Search for the Recursive DNS Server (RDNSS) option
rdnssOption = ndpGetOption(message->options, length, NDP_OPT_RECURSIVE_DNS_SERVER);
//RDNSS option found?
if(rdnssOption != NULL && rdnssOption->length >= 1)
{
//Retrieve the number of addresses
n = (rdnssOption->length - 1) / 2;
//Save DNS servers
for(i = 0; i < n; i++)
ipv6SetDnsServer(context->interface, i, &rdnssOption->address[i]);
}
}
//Set time stamp
context->timestamp = osGetSystemTime();
//Reset timeout value
context->timeout = 0;
//Reset retransmission counter
context->retransmitCount = 0;
//Verify the uniqueness of the global address
context->state = SLAAC_STATE_GLOBAL_ADDR_DAD;
}
void slaacTick(SlaacContext *context)
{
systime_t time;
//Get current time
time = osGetSystemTime();
//Enter critical section
osAcquireMutex(&context->mutex);
//Check current state
if(context->state == SLAAC_STATE_INIT)
{
//Check link state
if(context->running && context->interface->linkState)
{
Eui64 interfaceId;
Ipv6Addr linkLocalAddr;
//Generate the 64-bit interface identifier
macAddrToEui64(&context->interface->macAddr, &interfaceId);
//A link-local address is formed by combining the well-known
//link-local prefix fe80::0 with the interface identifier
linkLocalAddr.w[0] = htons(0xFE80);
linkLocalAddr.w[1] = htons(0x0000);
linkLocalAddr.w[2] = htons(0x0000);
linkLocalAddr.w[3] = htons(0x0000);
linkLocalAddr.w[4] = interfaceId.w[0];
linkLocalAddr.w[5] = interfaceId.w[1];
linkLocalAddr.w[6] = interfaceId.w[2];
linkLocalAddr.w[7] = interfaceId.w[3];
//Use the link-local address as a tentative address
ipv6SetLinkLocalAddr(context->interface,
&linkLocalAddr, IPV6_ADDR_STATE_TENTATIVE);
//Set time stamp
context->timestamp = time;
//Reset timeout value
context->timeout = 0;
//Reset retransmission counter
context->retransmitCount = 0;
//Verify the uniqueness of the link-local address
context->state = SLAAC_STATE_LINK_LOCAL_ADDR_DAD;
}
}
else if(context->state == SLAAC_STATE_LINK_LOCAL_ADDR_DAD)
{
//Check current time
if((time - context->timestamp) >= context->timeout)
{
//Duplicate Address Detection failed?
if(context->interface->ipv6Config.linkLocalAddrDup)
{
//A tentative address that is determined to be a duplicate
//must not be assigned to an interface
ipv6SetLinkLocalAddr(context->interface,
&IPV6_UNSPECIFIED_ADDR, IPV6_ADDR_STATE_INVALID);
//Address autoconfiguration failed
context->state = SLAAC_STATE_ERROR;
//Dump current IPv6 configuration for debugging purpose
slaacDumpConfig(context);
}
#if (NDP_DUP_ADDR_DETECT_TRANSMITS > 0)
//Duplicate Address Detection is on-going?
else if(context->retransmitCount < NDP_DUP_ADDR_DETECT_TRANSMITS)
{
//Send Neighbor Solicitation message
ndpSendNeighborSol(context->interface, &context->interface->ipv6Config.linkLocalAddr);
//Save the time at which the message was sent
context->timestamp = time;
//Set timeout value
context->timeout = NDP_RETRANS_TIMER;
//Increment retransmission counter
context->retransmitCount++;
}
#endif
//Duplicate Address Detection is complete?
else
{
//The use of the link-local address is now unrestricted
context->interface->ipv6Config.linkLocalAddrState = IPV6_ADDR_STATE_PREFERRED;
//Set time stamp
context->timestamp = time;
//Delay before transmitting the first Router Solicitation message
context->timeout = tcpIpStackGetRandRange(0, NDP_MAX_RTR_SOLICITATION_DELAY);
//Reset retransmission counter
context->retransmitCount = 0;
//To obtain an advertisement quickly, a host sends out Router Solicitations
context->state = SLAAC_STATE_ROUTER_SOLICIT;
}
}
}
else if(context->state == SLAAC_STATE_ROUTER_SOLICIT)
{
//Check current time
if((time - context->timestamp) >= context->timeout)
{
//Check retransmission counter
if(context->retransmitCount < NDP_MAX_RTR_SOLICITATIONS)
{
//Send Router Solicitation message
ndpSendRouterSol(context->interface);
//Save the time at which the message was sent
context->timestamp = time;
//Set timeout value
context->timeout = NDP_RTR_SOLICITATION_INTERVAL;
//Increment retransmission counter
context->retransmitCount++;
}
else
{
//A link has no routers if no Router Advertisements are received
//after having sent a small number of Router Solicitations
context->state = SLAAC_STATE_ERROR;
//Dump current IPv6 configuration for debugging purpose
slaacDumpConfig(context);
}
}
}
else if(context->state == SLAAC_STATE_GLOBAL_ADDR_DAD)
{
//Check current time
if((time - context->timestamp) >= context->timeout)
{
//Duplicate Address Detection failed?
if(context->interface->ipv6Config.globalAddrDup)
{
//A tentative address that is determined to be a duplicate
//must not be assigned to an interface
ipv6SetGlobalAddr(context->interface,
&IPV6_UNSPECIFIED_ADDR, IPV6_ADDR_STATE_INVALID);
//Address autoconfiguration failed
context->state = SLAAC_STATE_ERROR;
//Dump current IPv6 configuration for debugging purpose
slaacDumpConfig(context);
}
#if (NDP_DUP_ADDR_DETECT_TRANSMITS > 0)
//Duplicate Address Detection is on-going?
else if(context->retransmitCount < NDP_DUP_ADDR_DETECT_TRANSMITS)
{
//Send Neighbor Solicitation message
ndpSendNeighborSol(context->interface, &context->interface->ipv6Config.globalAddr);
//Save the time at which the message was sent
context->timestamp = time;
//Set timeout value
context->timeout = NDP_RETRANS_TIMER;
//Increment retransmission counter
context->retransmitCount++;
}
#endif
//Duplicate Address Detection is complete?
else
{
//The use of the global address is now unrestricted
context->interface->ipv6Config.globalAddrState = IPV6_ADDR_STATE_PREFERRED;
//Successful address autoconfiguration
context->state = SLAAC_STATE_CONFIGURED;
//Dump current IPv6 configuration for debugging purpose
slaacDumpConfig(context);
}
}
}
//Leave critical section
osReleaseMutex(&context->mutex);
}
error_t wilc1000Init(NetInterface *interface)
{
int8_t status;
tstrWifiInitParam param;
//STA or AP mode?
if(interface->nicDriver == &wilc1000StaDriver)
{
//Debug message
TRACE_INFO("Initializing WILC1000 (STA mode)...\r\n");
}
else
{
//Debug message
TRACE_INFO("Initializing WILC1000 (AP mode)...\r\n");
}
//Start of exception handling block
do
{
//Initialization sequence is performed once at startup
if(wilc1000StaInterface == NULL && wilc1000ApInterface == NULL)
{
//Low-level initialization
status = nm_bsp_init();
//Check status code
if(status != M2M_SUCCESS)
break;
//Set default parameters
memset(¶m, 0, sizeof(param));
//Register callback functions
param.pfAppWifiCb = wilc1000AppWifiEvent;
param.pfAppMonCb = NULL;
param.strEthInitParam.pfAppWifiCb = NULL;
param.strEthInitParam.pfAppEthCb = wilc1000AppEthEvent;
//Set receive buffer
param.strEthInitParam.au8ethRcvBuf = rxBuffer;
param.strEthInitParam.u16ethRcvBufSize = WILC1000_RX_BUFFER_SIZE - ETH_CRC_SIZE;
//Initialize WILC1000 controller
status = m2m_wifi_init(¶m);
//Check status code
if(status != M2M_SUCCESS)
break;
//Optionally set the station MAC address
if(macCompAddr(&interface->macAddr, &MAC_UNSPECIFIED_ADDR))
{
//Use the factory preprogrammed station address
status = m2m_wifi_get_mac_address(interface->macAddr.b);
//Check status code
if(status != M2M_SUCCESS)
break;
//Generate the 64-bit interface identifier
macAddrToEui64(&interface->macAddr, &interface->eui64);
}
else
{
//Override the factory preprogrammed address
status = m2m_wifi_set_mac_address(interface->macAddr.b);
//Check status code
if(status != M2M_SUCCESS)
break;
}
}
else
{
//Initialization was already done
status = M2M_SUCCESS;
}
//STA or AP mode?
if(interface->nicDriver == &wilc1000StaDriver)
{
//Save underlying network interface (STA mode)
wilc1000StaInterface = interface;
if(wilc1000ApInterface != NULL)
{
wilc1000StaInterface->macAddr = wilc1000ApInterface->macAddr;
wilc1000StaInterface->eui64 = wilc1000ApInterface->eui64;
}
}
else
{
//Save underlying network interface (AP mode)
wilc1000ApInterface = interface;
if(wilc1000StaInterface != NULL)
{
wilc1000ApInterface->macAddr = wilc1000StaInterface->macAddr;
wilc1000ApInterface->eui64 = wilc1000StaInterface->eui64;
}
}
//End of exception handling block
} while(0);
//WILC1000 is now ready to send
osSetEvent(&interface->nicTxEvent);
//Return status code
if(status == M2M_SUCCESS)
return NO_ERROR;
else
return ERROR_FAILURE;
}