Store local bindings in a rbtree

don't connect on first hello, there are chances that ours is not seen yet
setproctitle with ldp id - useful for rump kernels testing
fix a memory leak in ldp_peer_new
don't holddown if already holded

don't connect on first hello, there are chances that ours is not seen yet
setproctitle with ldp id - useful for rump kernels testing
fix a memory leak in ldp_peer_new
don't holddown if already holded down
peer sockets are now non-blocking
connected routes deletes are now processed
check if peer is connected before attempting to sending label mappings

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* rework the reattachment code
* build an implnull label when a route is added and let mpls_add_label
to take care of relabelling
* take out last piece of the code where we do route lookups - we sh

* rework the reattachment code
* build an implnull label when a route is added and let mpls_add_label
to take care of relabelling
* take out last piece of the code where we do route lookups - we should have
every information we need in labels
* tested these changes using a number of rump kernels and some couple of
thousands of flapping routes

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Make sure labels are always updated when a route is added and when a peer
is added
Rework mpls_add_label according to that so no route refresh is done anymore
Use poll when reading the PF_ROUTE socke

Make sure labels are always updated when a route is added and when a peer
is added
Rework mpls_add_label according to that so no route refresh is done anymore
Use poll when reading the PF_ROUTE socket
setsockopt SO_USELOOPBACK on the PF_ROUTE socket
Output some information on SIGINFO
Allow map changing for a ldp peer
Finally fix the connected routes admission into labels
Correct the route trigger when a label map is received

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send the actual prefix on the wire instead of struct headers
statify

sprinkle more const

Constify a little bit

modify structures in order to accomodate IPv6 according to
draft-ietf-mpls-ldp-ipv6. Correct a little bit IPv6 hello path

* add initial IPv6 support - still incomplete at this moment, but it sends
out there IPv6 hellos. Interoperability not yet tested.
* sync man page with reality

we need to add mapping even if there is no route for the prefix

stop processing a label mapping message if we don't have a route for it.
This way we avoid failing an assert later in mpls_add_label()

- no cast for malloc
- malloc + memset = calloc
- sizeof(type) -> sizeof(*var)
- small indents

Add ldpd, a RFC 3036 compatible LDP speaker.