ldpd(8): Fix address of misaligned packed members.

PR kern/56895

Avoid common symbol definitions

Use RO_MSGFILTER.

ensure variables are initialised

allow setting transport addresses for interfaces into config file
also move passive-interface functionality under interface block
report the correct line for config parsing errors

check route messages sizes more carefully
cache pid
treat every message at a time, even if there are more messages to read
interpret also cloning routes

The latter two should fix the ldp_regen test

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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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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Constify a little bit

First send initialize and keep alive after that. Fixes inter-operability
issues regarding session initialization.

move code around a little bit in order to call get_ldp_peer correctly
check also for transport_address in get_ldp_peer

* Don't assume INET in connection path
* Lookup in hello list in order to get the correct LDP ID, instead of
transport address
* Improve an error message

Don't try to connect to peers before sending hellos

Be a little more strict when sending notifications and checking PDU

permit notifications even if session not fully established

Fix the transport address TLV mess I created after INET6 convert
Use a single loop to decrement and check hello list keepalives
Display transport address in show hello output

* add a new keyword for config file - passive-if and check if it's
allowed to use the interface before join/send mcast
* check if interface supports multicast before join/send mcast

use predefined group consts/macros instead of ptoning strings

allow compile without -DINET6

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

Make sure there is enough space for sockaddr subtypes
Use u_char for IP_MULTICAST_LOOP as specified in in.h

Use local-link address as source for hellos

Repair another %lu --> %zd - this one was caught by building for
evbmips port

fix the build; ssize_t is %zd not %lu

* 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