OpenBSD CVS

CVS log for src/usr.sbin/ospf6d/ospf6d.c


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Default branch: MAIN


Revision 1.54 / (download) - annotate - [select for diffs], Wed Jun 21 09:47:03 2023 UTC (11 months, 2 weeks ago) by sthen
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, HEAD
Changes since 1.53: +4 -1 lines
Diff to previous 1.53 (colored)

add "fib reload" support to ospf6d/ospf6ctl, and trigger it
automatically on a timeout after RTM_DESYNC (i.e. route socket
overflow). ported across from ospfd. fixes/ok claudio@

(it's much harder to overflow the routing socket buffer these
days since it was bumped to 2MB, but still happens occasionally
on a busy machine).

Revision 1.53 / (download) - annotate - [select for diffs], Wed Mar 8 04:43:14 2023 UTC (15 months ago) by guenther
Branch: MAIN
CVS Tags: OPENBSD_7_3_BASE, OPENBSD_7_3
Changes since 1.52: +1 -4 lines
Diff to previous 1.52 (colored)

Delete obsolete /* ARGSUSED */ lint comments.

ok miod@ millert@

Revision 1.52 / (download) - annotate - [select for diffs], Thu Jan 20 14:03:31 2022 UTC (2 years, 4 months ago) by naddy
Branch: MAIN
CVS Tags: OPENBSD_7_2_BASE, OPENBSD_7_2, OPENBSD_7_1_BASE, OPENBSD_7_1
Changes since 1.51: +2 -2 lines
Diff to previous 1.51 (colored)

ospf6d: fix -Wunused-but-set-variable warnings

ospf6d.c: sync a missing bit of (disabled) code with ospfd
rde.c: ifdef out some more incomplete code

ok denis@ claudio@

Revision 1.51 / (download) - annotate - [select for diffs], Mon Sep 6 13:32:18 2021 UTC (2 years, 9 months ago) by deraadt
Branch: MAIN
CVS Tags: OPENBSD_7_0_BASE, OPENBSD_7_0
Changes since 1.50: +2 -2 lines
Diff to previous 1.50 (colored)

repair missing paths on unveil failure

Revision 1.50 / (download) - annotate - [select for diffs], Tue Jan 19 09:54:08 2021 UTC (3 years, 4 months ago) by claudio
Branch: MAIN
CVS Tags: OPENBSD_6_9_BASE, OPENBSD_6_9
Changes since 1.49: +3 -3 lines
Diff to previous 1.49 (colored)

Make the struct imsgev static. With this ospf6d compiles with -fno-common

Revision 1.49 / (download) - annotate - [select for diffs], Tue Jan 19 09:46:51 2021 UTC (3 years, 4 months ago) by claudio
Branch: MAIN
Changes since 1.48: +2 -1 lines
Diff to previous 1.48 (colored)

Properly define ospfd_process as an extern in the header file.

Revision 1.48 / (download) - annotate - [select for diffs], Wed Sep 16 20:50:10 2020 UTC (3 years, 8 months ago) by remi
Branch: MAIN
CVS Tags: OPENBSD_6_8_BASE, OPENBSD_6_8
Changes since 1.47: +4 -3 lines
Diff to previous 1.47 (colored)

Stop removing the control socket on exit and tighten the unveil even
further. This is in line with what other networking daemons do.

ok mestre@

Revision 1.47 / (download) - annotate - [select for diffs], Fri Jun 26 19:06:52 2020 UTC (3 years, 11 months ago) by bket
Branch: MAIN
Changes since 1.46: +2 -5 lines
Diff to previous 1.46 (colored)

Replace SIMPLEQ concatenation loop with SIMPLEQ_CONCAT

OK florian@, millert@, kn@

Revision 1.46 / (download) - annotate - [select for diffs], Thu Jan 2 10:16:46 2020 UTC (4 years, 5 months ago) by denis
Branch: MAIN
CVS Tags: OPENBSD_6_7_BASE, OPENBSD_6_7
Changes since 1.45: +2 -2 lines
Diff to previous 1.45 (colored)

Rename orig_rtr_lsa_area() to orig_rtr_lsa()

Now that area is part of iface, original orig_rtr_lsa() is useless. Also
verifying that area != NULL is not needed in some cases (these are
leftovers of the previous diff).

OK remi@

Revision 1.45 / (download) - annotate - [select for diffs], Mon Dec 16 08:28:33 2019 UTC (4 years, 5 months ago) by denis
Branch: MAIN
Changes since 1.44: +20 -4 lines
Diff to previous 1.44 (colored)

Rework route priority filter.

reads OK benno@ remi@

Revision 1.44 / (download) - annotate - [select for diffs], Mon Mar 25 20:53:33 2019 UTC (5 years, 2 months ago) by jca
Branch: MAIN
CVS Tags: OPENBSD_6_6_BASE, OPENBSD_6_6, OPENBSD_6_5_BASE, OPENBSD_6_5
Changes since 1.43: +3 -1 lines
Diff to previous 1.43 (colored)

One more TODO entry for reload support: check router-id changes

ok benno@

Revision 1.43 / (download) - annotate - [select for diffs], Tue Jan 15 22:18:10 2019 UTC (5 years, 4 months ago) by remi
Branch: MAIN
Changes since 1.42: +12 -7 lines
Diff to previous 1.42 (colored)

For external LSAs the type (1 or 2) is encoded in the metric field. Do not
overwrite this when using "redistribute X set type 2 depend on ifX" and ifX
is down.

Problem reported for ospfd by Igor Podlesny.

ok benno@

Revision 1.42 / (download) - annotate - [select for diffs], Mon Jan 14 16:50:56 2019 UTC (5 years, 4 months ago) by florian
Branch: MAIN
Changes since 1.41: +2 -2 lines
Diff to previous 1.41 (colored)

Improve error message when daemon is already running.
OK millert, deraadt, job

Revision 1.41 / (download) - annotate - [select for diffs], Sat Dec 29 16:04:31 2018 UTC (5 years, 5 months ago) by remi
Branch: MAIN
Changes since 1.40: +2 -2 lines
Diff to previous 1.40 (colored)

Add config option fib-priority to set a custom prio for routes ospf6d
inserts into the kernel routing table.

OK denis@

Revision 1.40 / (download) - annotate - [select for diffs], Tue Oct 30 16:52:19 2018 UTC (5 years, 7 months ago) by remi
Branch: MAIN
Changes since 1.39: +6 -1 lines
Diff to previous 1.39 (colored)

ospf6d does not support reloading so its parent proc does not need
filesystem access with the exception of the control socket cleanup on
exit.

ok florian@

Revision 1.39 / (download) - annotate - [select for diffs], Sat Sep 1 19:21:10 2018 UTC (5 years, 9 months ago) by remi
Branch: MAIN
CVS Tags: OPENBSD_6_4_BASE, OPENBSD_6_4
Changes since 1.38: +17 -1 lines
Diff to previous 1.38 (colored)

Prevent ospf6d from starting when another process is listening on the
control socket.

ok florian@

Revision 1.38 / (download) - annotate - [select for diffs], Thu Jul 12 13:45:03 2018 UTC (5 years, 10 months ago) by remi
Branch: MAIN
Changes since 1.37: +11 -4 lines
Diff to previous 1.37 (colored)

Add support for rdomains.

small quirk from tb@
ok phessler@

Revision 1.37 / (download) - annotate - [select for diffs], Thu Jul 12 12:19:05 2018 UTC (5 years, 10 months ago) by remi
Branch: MAIN
Changes since 1.36: +30 -7 lines
Diff to previous 1.36 (colored)

With the "depend on" option routes are sent out with a metric of 65535 if
the referenced interface is down or in state backup. This is especially
useful on a carp cluster to ensure all traffic goes to the carp master.

ok friehm@ jca@

Revision 1.36 / (download) - annotate - [select for diffs], Mon Jul 9 13:19:46 2018 UTC (5 years, 11 months ago) by remi
Branch: MAIN
Changes since 1.35: +1 -2 lines
Diff to previous 1.35 (colored)

Set log_setverbose(1) early to see debug logs during parsing the config
but only when -v is used.

ok jca@ claudio@

Revision 1.35 / (download) - annotate - [select for diffs], Sun Nov 5 16:56:02 2017 UTC (6 years, 7 months ago) by jca
Branch: MAIN
CVS Tags: OPENBSD_6_3_BASE, OPENBSD_6_3
Changes since 1.34: +5 -1 lines
Diff to previous 1.34 (colored)

Disable config reload, ospf6d just exits on reload with simple setups.

And fixing this doesn't appear trivial.  Discussed with a bunch at
p2k17, ok phessler@ denis@ benno@

Revision 1.34 / (download) - annotate - [select for diffs], Sat Aug 12 16:27:50 2017 UTC (6 years, 9 months ago) by benno
Branch: MAIN
CVS Tags: OPENBSD_6_2_BASE, OPENBSD_6_2
Changes since 1.33: +9 -8 lines
Diff to previous 1.33 (colored)

bring ospf6d's log.c in sync with ospfd and bgpd
ok florian@ claudio@

Revision 1.33 / (download) - annotate - [select for diffs], Tue May 30 12:42:31 2017 UTC (7 years ago) by friehm
Branch: MAIN
Changes since 1.32: +5 -3 lines
Diff to previous 1.32 (colored)

Adding multipath route support to ospf6d. Almost copied from ospfd.

OK bluhm@

Revision 1.32 / (download) - annotate - [select for diffs], Sat Sep 3 10:25:36 2016 UTC (7 years, 9 months ago) by renato
Branch: MAIN
CVS Tags: OPENBSD_6_1_BASE, OPENBSD_6_1
Changes since 1.31: +22 -57 lines
Diff to previous 1.31 (colored)

Simplify shutdown process.

On shutdown, there's no need to use kill(2) to kill the child
processes. Just closing the IPC sockets will make the children receive
an EOF, break out from the event loop and then exit.

Tha advantages of this "pipe teardown" are:
* simpler code;
* no need to pledge "proc" in the parent process;
* removal of a (hard to trigger) PID reuse race condition.

ok benno@ claudio@

Revision 1.31 / (download) - annotate - [select for diffs], Fri Sep 2 14:06:35 2016 UTC (7 years, 9 months ago) by benno
Branch: MAIN
Changes since 1.30: +2 -1 lines
Diff to previous 1.30 (colored)

work on making log.c similar in all daemons:

move daemon-local functions into new logmsg.c, and reduce
the (mostly whitespace) differences so that log.c's can be diffed easily.

ok claudio@, feedback from henning@, deraadt@, reyk@

Revision 1.30 / (download) - annotate - [select for diffs], Tue Feb 2 17:51:11 2016 UTC (8 years, 4 months ago) by sthen
Branch: MAIN
CVS Tags: OPENBSD_6_0_BASE, OPENBSD_6_0, OPENBSD_5_9_BASE, OPENBSD_5_9
Changes since 1.29: +1 -4 lines
Diff to previous 1.29 (colored)

Remove setproctitle() for the parent process. Because rc.d(8) uses process
titles (including flags) to distinguish between daemons, this makes it
possible to manage multiple copies of a daemon using the normal infrastructure
by symlinking rc.d scripts to a new name. ok jung@ ajacoutot@, smtpd ok gilles@

Revision 1.29 / (download) - annotate - [select for diffs], Sat Dec 5 13:12:41 2015 UTC (8 years, 6 months ago) by claudio
Branch: MAIN
Changes since 1.28: +3 -3 lines
Diff to previous 1.28 (colored)

EAGAIN handling for imsg_read. OK henning@ benno@

Revision 1.28 / (download) - annotate - [select for diffs], Sun Sep 27 17:31:50 2015 UTC (8 years, 8 months ago) by stsp
Branch: MAIN
Changes since 1.27: +2 -2 lines
Diff to previous 1.27 (colored)

As done for bgpd recently, rename if_mediatype to if_type in ospfd/ospf6d.
And some ifmedia64 fixes.
"move forward" deraadt@

Revision 1.27 / (download) - annotate - [select for diffs], Tue Feb 10 05:39:10 2015 UTC (9 years, 4 months ago) by claudio
Branch: MAIN
CVS Tags: OPENBSD_5_8_BASE, OPENBSD_5_8, OPENBSD_5_7_BASE, OPENBSD_5_7
Changes since 1.26: +7 -11 lines
Diff to previous 1.26 (colored)

Same session_socket_blockmode() changes as done to ospfd. Also do the same
kroute change (make socket non-blocking and add trigger for partial reads).

Revision 1.26 / (download) - annotate - [select for diffs], Fri Jan 16 06:40:19 2015 UTC (9 years, 4 months ago) by deraadt
Branch: MAIN
Changes since 1.25: +1 -2 lines
Diff to previous 1.25 (colored)

Replace <sys/param.h> with <limits.h> and other less dirty headers where
possible.  Annotate <sys/param.h> lines with their current reasons.  Switch
to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc.  Change
MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where
sensible to avoid pulling in the pollution.  These are the files confirmed
through binary verification.
ok guenther, millert, doug (helped with the verification protocol)

Revision 1.25 / (download) - annotate - [select for diffs], Sat Jul 12 20:16:38 2014 UTC (9 years, 10 months ago) by krw
Branch: MAIN
CVS Tags: OPENBSD_5_6_BASE, OPENBSD_5_6
Changes since 1.24: +7 -3 lines
Diff to previous 1.24 (colored)

Close connections when msgbuf_write() returns 0.

ok claudio@

Revision 1.24 / (download) - annotate - [select for diffs], Wed Nov 13 20:49:49 2013 UTC (10 years, 6 months ago) by benno
Branch: MAIN
CVS Tags: OPENBSD_5_5_BASE, OPENBSD_5_5
Changes since 1.23: +3 -3 lines
Diff to previous 1.23 (colored)

handle msgbuf_write() returning EAGAIN,
taken from claudios previous fix to ospfd.

"do it" deraadt@

Revision 1.23 / (download) - annotate - [select for diffs], Fri Mar 22 14:25:31 2013 UTC (11 years, 2 months ago) by sthen
Branch: MAIN
CVS Tags: OPENBSD_5_4_BASE, OPENBSD_5_4
Changes since 1.22: +11 -4 lines
Diff to previous 1.22 (colored)

Allow use of an alternative control socket, ported from ospfd. ok claudio@

Revision 1.22 / (download) - annotate - [select for diffs], Sat Aug 20 19:02:28 2011 UTC (12 years, 9 months ago) by sthen
Branch: MAIN
CVS Tags: OPENBSD_5_3_BASE, OPENBSD_5_3, OPENBSD_5_2_BASE, OPENBSD_5_2, OPENBSD_5_1_BASE, OPENBSD_5_1
Changes since 1.21: +3 -1 lines
Diff to previous 1.21 (colored)

Decouple log_verbose() from log_init() so the verbose flag stays set with
"-v" (previously only "-vd" worked). Similar to recent ospfd commit.
ok claudio@

Revision 1.21 / (download) - annotate - [select for diffs], Sun Aug 22 21:15:25 2010 UTC (13 years, 9 months ago) by bluhm
Branch: MAIN
CVS Tags: OPENBSD_5_0_BASE, OPENBSD_5_0, OPENBSD_4_9_BASE, OPENBSD_4_9
Changes since 1.20: +25 -22 lines
Diff to previous 1.20 (colored)

Redistributing the default route with ospf6d did not work correctly.
- kroute.c may not ignore the default route.
- Use the ROUNDUP macro from route/show.c as this one is also correct
  for netmask with prefixlen 0.
- Implement ospf_redistribute and the redistribute parser like
  ospfd.
ok claudio@

Revision 1.20 / (download) - annotate - [select for diffs], Tue Jul 6 13:24:35 2010 UTC (13 years, 11 months ago) by bluhm
Branch: MAIN
CVS Tags: OPENBSD_4_8_BASE, OPENBSD_4_8
Changes since 1.19: +3 -1 lines
Diff to previous 1.19 (colored)

Update the interfaces changes from kroute to rde via imsg.  This
is needed to orginate correct intra-area-prefix-lsas.
ok claudio@ stsp@

Revision 1.19 / (download) - annotate - [select for diffs], Thu Jul 1 18:57:21 2010 UTC (13 years, 11 months ago) by bluhm
Branch: MAIN
Changes since 1.18: +3 -1 lines
Diff to previous 1.18 (colored)

The prefixes of interface addresses of an ospf link have to be
advertised as link-lsa and intra-area-prefix-lsa when they change
dynamically.  Handle RTM_NEWADDR and RTM_DELADDR in kroute by sending
an imsg to ospfe.  Upon this event, originate a new link-lsa in
ospfe.  In rde a new intra-area-prefix-lsa is generated when a
link-lsa appears or goes away.
ok claudio@; ok and test stsp@

Revision 1.18 / (download) - annotate - [select for diffs], Tue Dec 22 19:47:05 2009 UTC (14 years, 5 months ago) by claudio
Branch: MAIN
CVS Tags: OPENBSD_4_7_BASE, OPENBSD_4_7
Changes since 1.17: +0 -2 lines
Diff to previous 1.17 (colored)

Crap. Remove debug code that I did not plan to commit.

Revision 1.17 / (download) - annotate - [select for diffs], Tue Dec 22 19:44:52 2009 UTC (14 years, 5 months ago) by claudio
Branch: MAIN
Changes since 1.16: +3 -1 lines
Diff to previous 1.16 (colored)

Holy inconsitancy Batman! While it is impossible to use embeded scope ids
in almost all sockaddr_in6 addresses it is required for the nexthop and
sin6_scope_id is actually ignored there.
This needs to be fixed but my quota of IPv6 insanity is already used for today.
Workaround for now. My simple testsetup is now actually able to install
the first ospf6d learned routes in the kernel. Weeee!

Revision 1.16 / (download) - annotate - [select for diffs], Mon Nov 2 20:24:58 2009 UTC (14 years, 7 months ago) by claudio
Branch: MAIN
Changes since 1.15: +8 -3 lines
Diff to previous 1.15 (colored)

Add IMSG_CTL_LOG_VERBOSE similar to ospfd it allows to toggle debug logging.
henning, sthen, michele like the idea

Revision 1.15 / (download) - annotate - [select for diffs], Sat Jun 6 09:02:46 2009 UTC (15 years ago) by eric
Branch: MAIN
CVS Tags: OPENBSD_4_6_BASE, OPENBSD_4_6
Changes since 1.14: +54 -39 lines
Diff to previous 1.14 (colored)

make ospf6ctl/ospf6d imsg-in-a-lib ready too.

ospf6ctl is already broken in tree (not connected to build).

ok pyr@

Revision 1.14 / (download) - annotate - [select for diffs], Sun May 31 20:29:56 2009 UTC (15 years ago) by jacekm
Branch: MAIN
Changes since 1.13: +1 -3 lines
Diff to previous 1.13 (colored)

Remove redundant imsg_event_add calls; ok claudio@

Revision 1.13 / (download) - annotate - [select for diffs], Sun May 31 17:00:40 2009 UTC (15 years ago) by claudio
Branch: MAIN
Changes since 1.12: +7 -15 lines
Diff to previous 1.12 (colored)

libevent handler fix to allow EV_READ and EV_WRITE to be set at the same
time in the callback. Same diff that went into ospfd applied with some
fuzz.

Revision 1.12 / (download) - annotate - [select for diffs], Sat Mar 28 15:38:58 2009 UTC (15 years, 2 months ago) by michele
Branch: MAIN
Changes since 1.11: +5 -5 lines
Diff to previous 1.11 (colored)

Print the correct function name in log_debug().

ok stsp@

Revision 1.11 / (download) - annotate - [select for diffs], Sun Dec 28 22:05:04 2008 UTC (15 years, 5 months ago) by sobrado
Branch: MAIN
CVS Tags: OPENBSD_4_5_BASE, OPENBSD_4_5
Changes since 1.10: +2 -2 lines
Diff to previous 1.10 (colored)

a few documentation updates for opsf6(8) and ospf6ctl(8): remove an
existing (but undocumented) flag from the usage of ospf6d;
documentation tweaks; while here, synchronize synopsis and usage.

ok claudio@

Revision 1.10 / (download) - annotate - [select for diffs], Tue May 13 11:46:57 2008 UTC (16 years, 1 month ago) by pyr
Branch: MAIN
CVS Tags: OPENBSD_4_4_BASE, OPENBSD_4_4
Changes since 1.9: +5 -5 lines
Diff to previous 1.9 (colored)

Unmangle previous commit. spotted by markus@ (wow !)

Revision 1.9 / (download) - annotate - [select for diffs], Mon May 12 19:15:02 2008 UTC (16 years, 1 month ago) by pyr
Branch: MAIN
Changes since 1.8: +6 -1 lines
Diff to previous 1.8 (colored)

Error out with usage line if additional arguments are given after the
option parsing. Found out the hard way by jdixon on ifstated.

ok sobrado@, jdixon@, millert@

Revision 1.8 / (download) - annotate - [select for diffs], Thu Dec 13 08:54:05 2007 UTC (16 years, 6 months ago) by claudio
Branch: MAIN
CVS Tags: OPENBSD_4_3_BASE, OPENBSD_4_3
Changes since 1.7: +12 -41 lines
Diff to previous 1.7 (colored)

Monster commit of stuff I did mostly last month. What it does:
 * removes kif and uses iface for everything interface related.
   This removes unneeded data redundancy which makes the code more complex.
 * adds the link local prefix to struct iface and attaches a list with
   the other prefixes to the struct iface. This is needed to generate the
   link LSA.
 * disconnects struct iface from struct area (the backpointer is gone)
   this will make the reload code a bit easier.
norby@ agrees with the direction we're heading with this

Revision 1.7 / (download) - annotate - [select for diffs], Thu Oct 25 12:05:20 2007 UTC (16 years, 7 months ago) by claudio
Branch: MAIN
Changes since 1.6: +9 -3 lines
Diff to previous 1.6 (colored)

Support -D makro=value like bgpd and ripd. OK norby@

Revision 1.6 / (download) - annotate - [select for diffs], Sat Oct 20 13:26:50 2007 UTC (16 years, 7 months ago) by pyr
Branch: MAIN
Changes since 1.5: +5 -4 lines
Diff to previous 1.5 (colored)

Sync parse.y with recent enhancements in hoststated.
Fix behavior when running -n.
henning@

Revision 1.5 / (download) - annotate - [select for diffs], Tue Oct 16 08:41:56 2007 UTC (16 years, 7 months ago) by claudio
Branch: MAIN
Changes since 1.4: +8 -6 lines
Diff to previous 1.4 (colored)

First step at making kroute IPv6 aware. This resulted in many additional
changes -- some are so hairy that I left them out for later by commenting out
larger blocks of code (just grep for XXX if you like to help).
Get it in early so that we can work on.
OK norby@

Revision 1.4 / (download) - annotate - [select for diffs], Sat Oct 13 16:35:22 2007 UTC (16 years, 7 months ago) by deraadt
Branch: MAIN
Changes since 1.3: +1 -25 lines
Diff to previous 1.3 (colored)

in all these programs using the same pfctl-derived parse.y, re-unify the
yylex implementation and the code which interacts with yylex.  this also
brings the future potential for include support to all of the parsers.
in the future please do not silly modifications to one of these files
without checking if you are de-unifying the code.
checked by developers in all these areas.

Revision 1.3 / (download) - annotate - [select for diffs], Thu Oct 11 21:25:37 2007 UTC (16 years, 8 months ago) by claudio
Branch: MAIN
Changes since 1.2: +1 -2 lines
Diff to previous 1.2 (colored)

No need to store the interface mask. An interface represents a link and is
only addressed via its link local address. All networks on top of it are
handled separately via type 8 Link-LSA.

Revision 1.2 / (download) - annotate - [select for diffs], Thu Oct 11 19:02:47 2007 UTC (16 years, 8 months ago) by claudio
Branch: MAIN
Changes since 1.1: +1 -5 lines
Diff to previous 1.1 (colored)

From ospfd:
Bye bye global ospf options. OSPF options are per area (at least the one
flag that we set). So introduce a area_ospf_options() function that will
return the correct flags for each area. This makes stub area support a lot
easier.
Don't check for OSPF_OPTION_E in the parent. OSPF_OPTION_E is per area and
so the parent process has no way to know if it should redistribute or not.

Revision 1.1 / (download) - annotate - [select for diffs], Mon Oct 8 10:44:50 2007 UTC (16 years, 8 months ago) by norby
Branch: MAIN

Welcome ospf6d

The new ospf6d daemon will support OSPFv3, basically OSPF for IPv6 networks.

It is heavily based on ospfd(8), it is more or less a copy and paste of it.
Currently some unneeded stuff has been removed and the trasition from
IPv4 to IPv6 has begun.

ospf6d is not very usefull at the moment, it is being imported to allow more
people to work on it concurrently.

Not yet connected to the builds.

ok claudio@ dlg@

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