error_t dhcpv6RelayJoinMulticastGroup(Dhcpv6RelayCtx *context)
{
uint_t i;
uint_t j;
//Initialize status code
error_t error = NO_ERROR;
//Loop through the client-facing interfaces
for(i = 0; i < context->clientInterfaceCount; i++)
{
//Join the All_DHCP_Relay_Agents_and_Servers multicast
//group for each interface
error = ipv6JoinMulticastGroup(context->clientInterface[i],
&DHCPV6_ALL_RELAY_AGENTS_AND_SERVERS_ADDR);
//Unable to join the specified multicast group?
if(error) break;
}
//Did we encounter an error?
if(error)
{
//Clean up side effects before returning...
for(j = 0; j < i; j++)
{
//Leave the multicast group for each interface
ipv6LeaveMulticastGroup(context->clientInterface[j],
&DHCPV6_ALL_RELAY_AGENTS_AND_SERVERS_ADDR);
}
}
//Return status code
return error;
}
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;
}
error_t dhcpv6RelayLeaveMulticastGroup(Dhcpv6RelayCtx *context)
{
uint_t i;
//Loop through the client-facing interfaces
for(i = 0; i < context->clientInterfaceCount; i++)
{
//Leave the All_DHCP_Relay_Agents_and_Servers multicast
//group for each interface
ipv6LeaveMulticastGroup(context->clientInterface[i],
&DHCPV6_ALL_RELAY_AGENTS_AND_SERVERS_ADDR);
}
//Successsful processing
return NO_ERROR;
}
