This documentation is released under the Creative Commons licenseIPv6 support is implemented by several cooperating modules. The IPv6 module implements IPv6 datagram handling (sending, forwarding etc). It relies on RoutingTable6 to get access to the routes. RoutingTable6 also contains the neighbour discovery data structures (destination cache, neighbour cache, prefix list -- the latter effectively merged into the route table). Interface configuration (address, state, timeouts etc) is held in the InterfaceTable, in IPv6InterfaceData objects attached to InterfaceEntry as its ipv6() member.
The module IPv6NeighbourDiscovery implements all tasks associated with neighbour discovery and stateless address autoconfiguration. The data structures themselves (destination cache, neighbour cache, prefix list) are kept in RoutingTable6, and are accessed via public C++ methods. Neighbour discovery packets are only sent and processed by this module -- when IPv6 receives one, it forwards the packet to IPv6NeighbourDiscovery.
The rest of ICMPv6 (ICMP errors, echo request/reply etc) is implemented in the module ICMPv6, just like with IPv4. ICMP errors are sent into IPv6ErrorHandling, which the user can extend or replace to get errors handled in any way they like.
This documentation is released under the Creative Commons license