Prep v221: Update and clean up build system to sync with upstream This commit replays the moving around of source files that have been done between systemd-219 and systemd-221. Further the Makefile.am is synchronized with the upstream version and then "re-cleaned". A lot of functions, that are not used anywhere in elogind have been coated into #if 0/#endif directives to further shorten the list of dependencies. All unneeded files have been removed.
sd-icmp6-nd: Add support for fetching the latest expired prefix Keep the expired prefix for the duration of the prefix expiration event and remove it afterwards.
sd-icmp6-nd: Parse ICMPv6 prefix information Save each new onlink IPv6 prefix and attach an expiry timer to it. If the prefixes overlap, take the shorter prefix and write a debug message about the event. Once the prefix is resent in a Router Advertisement, update the timer. Add a new event for the expiring prefix. Add two helper functions, one for returning a prefix length given a Router Advertisement and the other for generic prefix matching given an IPv6 prefix and address.
sd-icmp6-nd: Add helper function to get the IPv6 link MTU Update MTU according to the latest value received.
sd-icmp6-nd: Add function to stop ongoing ICMPv6 discovery In some use cases stopping an ongoing ICMPv6 discovery is more useful than always unreferencing the whole structure.
sd-icmp6-nd: Add Router Solicitation and Advertisement support Provide functions to bind the ICMPv6 socket to the approriate interface and set multicast sending and receiving according to RFC 3493, section 5.2. and RFC 3542, sections 3. and 3.3. Filter out all ICMPv6 messages except Router Advertisements for the socket in question according to RFC 3542, section 3.2. Send Router Solicitations to the all routers multicast group as described in RFC 4861, section 6. and act on the received Router Advertisments according to section 6.3.7. Implement a similar API for ICMPv6 handling as is done for DHCPv4 and DHCPv6.