This implementation is based on RFC 6550 with addition of RFC 6554 (Source Routing Header for RPL). Both can be found under the following links:
- http://tools.ietf.org/html/rfc6550
- http://tools.ietf.org/html/rfc6554
The PR provides basic functionality for handling and forwarding packages in non-storing mode. In addition the structure of the previous implemented RPL storing mode is now revised, so that readability and modularity is increased. The following features are implemented:
- building function for a SRH and integration in common packets
- source-route build algorithm based on the structure of the DODAG
- an RPL-based interpretation of the SRH and removal at destination
- new structure for RPl-module with extracted beaconing-functionality
- leaf nodes are now supported
There are some missed goals and should be included in future updates:
- building a common routing table structure for different types of routing protocols
- routing tables are statically assigned via source code, future update should have an optional variable at build-time, which sets the size of the routing table depending on the desired functionality of a node in the network (root, node, leaf)
If there's no IPv6 address configured so far to any interface, 6lowpan
should not try to handle incoming packets. This can easily lead to
looping packets.
Instead of using differing integer types use kernel_pid_t for process
identifier. This type is introduced in a new header file to avoid
circular dependencies.
When sending a packet a workaround is applied when ndp_get_ll_address() returns NULL as is's not implemented properly yet.
The same should happen when a packet is forwarded as it's dropped otherwise.
msg_queue is defined but never used, hook it up so IP packets get queued instead of dropped when there is more than one.
change the name to ip_msg_queue to avoid naming conflicts.
