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Today's Topics:
1. Re: [PATCH 09/11] service: Change IPv6 support if split routing value
changes on IPv4 VPN
(David Woodhouse)
2. Re: [PATCH 09/11] service: Change IPv6 support if split routing value
changes on IPv4 VPN
(David Woodhouse)
3. Re: Online check down on IPV4 leading to a full production park crash
(Robert Tiemann)
----------------------------------------------------------------------
Date: Fri, 09 Apr 2021 14:05:44 +0100
From: David Woodhouse <dw...@infradead.org>
Subject: Re: [PATCH 09/11] service: Change IPv6 support if split
routing value changes on IPv4 VPN
To: Daniel Wagner <w...@monom.org>
Cc: connman@lists.01.org
Message-ID:
<19732e9058cc9933ffd8e664b14969811ecee94c.ca...@infradead.org>
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On Fri, 2021-04-09 at 09:02 +0200, Daniel Wagner wrote:
> I didn't know about ocserver. I've done some work for setting up an
> end-to-end test framework (shamelessly stolen form iwd/bluez). Let me
> refresh that stuff and see if I am able to get such a test setup
> running. This would make things way simpler to test.
If you just check out and build openconnect and then run 'make check',
it'll use the system ocserv (along with libsocket_wrapper to avoid
needing to run it as root).
It should all be suitably licensed so you can lift what you like from
it as you see fit. Some of it is a bit focused on torture testing the
various certificate methods (files and PKCS#11) but there's a simple
password-based one with a corresponding ocserv config that could be
useful:
https://git.infradead.org/users/dwmw2/openconnect.git/blob/HEAD:/tests/auth=
-username-pass
https://git.infradead.org/users/dwmw2/openconnect.git/blob/HEAD:/tests/comm=
on.sh
https://git.infradead.org/users/dwmw2/openconnect.git/blob/HEAD:/tests/conf=
igs/test-user-pass.config.in
The dtls-psk test actually does some checking of IP address ranges and
the corresponding client config that gets set up:
https://git.infradead.org/users/dwmw2/openconnect.git/blob/HEAD:/tests/dtls=
-psk
It should be fairly straightforward to massage those to instruct
ConnMan to connect to the testing ocserv, instead of running
OpenConnect directly.
Then again, if you don't actually need to pass traffic but only want to
test routing configuration, you probably don't need openconnect or
ocserv at all. Replace 'openconnect' in your testing with a script
which does nothing except create the tun device (if you didn't do that
for it already) then spawn the "vpnc-script" named in its -s argument
with a bunch of environment variables set according to the network
environment you want to simulate.
Let me know if you need anything more.
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------------------------------
Date: Fri, 09 Apr 2021 14:22:40 +0100
From: David Woodhouse <dw...@infradead.org>
Subject: Re: [PATCH 09/11] service: Change IPv6 support if split
routing value changes on IPv4 VPN
To: Jussi Laakkonen <jussi.laakko...@jolla.com>, Daniel Wagner
<w...@monom.org>
Cc: connman@lists.01.org
Message-ID:
<48fef5a249af974a9806731e5e78fa32a4d3abee.ca...@infradead.org>
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On Fri, 2021-04-09 at 15:58 +0300, Jussi Laakkonen wrote:
> Maybe for blocking IPv4, yes, but every service has an IPv4 address or=
=20
> support for it such as Facebook has, but not every service has IPv6 yet.=
=20
> This just culminates itself with DNS. If IPv4 is disabled, some of the=
=20
> services cease to work, whereas telling the OS not to use IPv6 has less=
=20
> breakages in general level. If you add unreachable route to elsewhere=20
> than to the VPN server, for instance, what you guess would happen with=
=20
> DNS when the server also serves AAAA requests? I saw problems when=20
> attempting that.
An IPv6-only network, if it wants to allow connectivity back to the
20th century, will do NAT64 and its DNS servers won't return A records
to the clients.
Or it might not provide direct connectivity (via NAT or otherwise) to
the outside world at all; it might require all access to go through
proxies, like the Intel corporate network did last time I was on it.
Either way, that's up to the VPN server configuration. If the VPN wants
to provide IPv6 connectivity and wants us to block Legacy IP egress
through the local network, that's a perfectly valid setup just as
providing Legacy IP and wanting us to block local IPv6 is.
And yes, it's also perfectly feasible to have VPN servers which happen
to be accessible over IPv6, which don't *yet* offer internal IPv6
connectivity to their clients. As companies finally drag themselves
into the 21st century, adding IPv6 connectivity on the *border* of
their network is a very easy first step, long before they manage to
update legacy systems and network topologies and migrate the *internal*
network to IPv6.
And even if the company *doesn't* provide IPv6, a client might still
connect to it over NAT64 from an IPv6-only network. So it's IPv6 for
the client, even when it's still Legacy IP on the server itself.=20
> Furthermore, as the routing tables are not managed yet by ConnMan (?)=20
> for IPv6 kernel can then just manipulate them when new information on=20
> routes arrives.
It'll manipulate the default table, sure. But the rule snippet I showed
was installing a higher-priority table. The kernel won't touch that one
even if autoconf is enabled.
> > Thinking about it, we have all the necessary code in place to setup suc=
h
> > routing tables. The providers should just tell the core to set such a
> > route. In fact, we already to this with the default routes. So it is be
> > fairly natural to push additional routes.
> >=20
>=20
> I did test almost similar setup with adding undefined routes for IPv6=20
> and the results were not good on connection establishment. Especially in=
=20
> those cases when the VPN server's DNS returns back with AAAA records.=20
> With the internal dnsproxy.c without explicitly telling which IP family=
=20
> to use (e.g., with simply using ping) the functionality is questionable=
=20
> to say the least if IPv6 has an undefined route, for example. Other=20
> apps, such as Qt enabled ones, had long delays in connecting to a web=20
> service when IPv6 routes led nowhere.
That sounds like the route wasn't actually *unreachable*. See RFC6724
=C2=A76, Rule 1.
If the IPv6 target is *unreachable*, the client should fall back
immediately to Legacy IP. That situation is exactly the same as when
you don't have IPv6 connectivity or IPv6 global addresses at all.
> Any other viable method I could think of was to simply utilize firewall,=
=20
> iptables in our case, to reject all connection attempts to IPv6, which=
=20
> would allow excluding certain addresses, such as in the specific=20
> scenarios David presented. This would make it possible to instantly=20
> reject all attempts. But did not go very far with that either yet.
Right, that would definitely not work right, since the routes wouldn't
be *unreachable*. The address selection mechanism would still prefer
them, and then they'd fail later =E2=80=94 leading to timeouts, failures, e=
tc.
It really does have to be *unreachable*.
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--=-5eJD7l2P3Rsm7h00sFQL--
------------------------------
Date: Fri, 9 Apr 2021 17:10:58 +0200
From: Robert Tiemann <r...@gmx.de>
Subject: Re: Online check down on IPV4 leading to a full production
park crash
To: connman@lists.01.org
Message-ID: <7640fe87-ce46-3355-3b50-d5ed76dac...@gmx.de>
Content-Type: text/plain; charset=utf-8; format=flowed
On 4/9/21 2:21 PM, VAUTRIN Emmanuel (Canal Plus Prestataire) wrote:
> Hello everyone,
Hi!
> It seems that the http://ipv4.connman.net/online/status.html is unreachable,
> contrary to http://ipv6.connman.net/online/status.html.
curl: (28) Failed to connect to ipv4.connman.net port 80: Connection
timed out
The problem is real and it still persists. It would be great if it
could be fixed soon.
> Best Regards,
>
> Emmanuel
Cheers,
Robert
------------------------------
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End of connman Digest, Vol 66, Issue 20
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