fix various typos in comments.

Separate nexthop caches from the routing table

By this change, nexthop caches (IP-MAC address pair) are not stored
in the routing table anymore. Instead nexthop caches are stored in
each network int

Separate nexthop caches from the routing table

By this change, nexthop caches (IP-MAC address pair) are not stored
in the routing table anymore. Instead nexthop caches are stored in
each network interface; we already have lltable/llentry data structure
for this purpose. This change also obsoletes the concept of cloning/cloned
routes. Cloned routes no longer exist while cloning routes still exist
with renamed to connected routes.

Noticeable changes are:
- Nexthop caches aren't listed in route show/netstat -r
- sysctl(NET_RT_DUMP) doesn't return them
- If RTF_LLDATA is specified, it returns nexthop caches
- Several definitions of routing flags and messages are removed
- RTF_CLONING, RTF_XRESOLVE, RTF_LLINFO, RTF_CLONED and RTM_RESOLVE
- RTF_CONNECTED is added
- It has the same value of RTF_CLONING for backward compatibility
- route's -xresolve, -[no]cloned and -llinfo options are removed
- -[no]cloning remains because it seems there are users
- -[no]connected is introduced and recommended
to be used instead of -[no]cloning
- route show/netstat -r drops some flags
- 'L' and 'c' are not seen anymore
- 'C' now indicates a connected route
- Gateway value of a route of an interface address is now not
a L2 address but "link#N" like a connected (cloning) route
- Proxy ARP: "arp -s ... pub" doesn't create a route

You can know details of behavior changes by seeing diffs under tests/.

Proposed on tech-net and tech-kern:
http://mail-index.netbsd.org/tech-net/2016/03/11/msg005701.html

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zeroize the rest of the comparable struct before adding it to the rb tree

Store local bindings in a rbtree

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

* use a flag in label struct in order to determine if we should treat the
associated routes using RTF_HOST
* clean the mess in flush_mpls_routes that could result in accessing
uninitialized memory

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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create binding for connected routes on startup
decay an warning message to debug only

retire union_ntoa, replace it with satos
check for valid sizes on PF_ROUTE socket
minor comment update

correct loopback address test
correct addr add/del handling

add code for address and address withdraw messages
get rid of unused fields in tlv struct

sprinkle more const

speed up a little bit the string<->prefixlen transforms

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

Add __printflike attribution to use vprintf and friends with an argument
as format string.

Correct prefixlen->sockaddr calculation. Now ldpd may finally allow MPLS
forwarding for default route.

shorten some execution paths related to check_route() and get_route()
statify a bit
don't assume AF_INET in a debug message

* add no-default-route option into configuration file and check it before
rejecting default-route
* exit process in case of error into the main loop
* complete FSM for RTM_CHANGE
* Check if we overfl

* add no-default-route option into configuration file and check it before
rejecting default-route
* exit process in case of error into the main loop
* complete FSM for RTM_CHANGE
* Check if we overflow pollfd array

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get rid of unused variable/assignments

use RT_ROUNDUP provided by net/route.h

check from_cidr_to_union() result

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

Add ldpd, a RFC 3036 compatible LDP speaker.