Date: Thu, 11 Mar 2010 23:59:44 -0500 From: David Horn <dhorn2000@gmail.com> To: Hiroki Sato <hrs@freebsd.org> Cc: freebsd-net@freebsd.org, dougb@freebsd.org, freebsd-rc@freebsd.org Subject: Re: Un-obsolete'ing ipv6_enable Message-ID: <25ff90d61003112059r2648543bn812468893fc3b19@mail.gmail.com> In-Reply-To: <25ff90d61003110809s4cc775e9r2ff6ebee151be6f6@mail.gmail.com> References: <4B945AA7.6070000@FreeBSD.org> <20100309.072719.200228546.hrs@allbsd.org> <25ff90d61003082037v3519995bx7e119e9d14143db4@mail.gmail.com> <20100309.135917.161082188.hrs@allbsd.org> <25ff90d61003110809s4cc775e9r2ff6ebee151be6f6@mail.gmail.com>
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<snip> for brevity sake
>> dh> Question 2) Assuming that people do desire consistency with allowing
>> dh> for both a global, and a per-interface setting, do you agree with
>> dh> having a global default for DHCPv4 (dhcpv4_default_enable), and for
>> dh> IPv6 slaac/accept_rtadv =A0(ipv6-slaac_default_enable), and the
>> dh> per-interface DHCPv4 (ifconfig_IF0=3D"dhcp") aka a meta configuratio=
n
>> dh> variable, and a per-interface IPv6 slaac (ifconfig_IF0=3D"slaac") ak=
a a
>> dh> meta configuration variable.
>>
>> =A0I think the global configuration can be realized by setting something
>> =A0like ifconfig_DEFAULT_<proto>=3D"AUTO" instead of adding a new global
>> =A0knobs.
>
> Yes, that is certainly one method that can work.
>
> I will put together two review versions of a diff. =A0One with backward
> compatible logic included (at least for the ipv6_enable YES/NO cases,
> and the ipv6_ifconfig_IF syntax ), and one with the backwards compat
> code removed to further this discussion.
>
<snip>
OK, now I am certain I have looked at this far too long at the moment,
but here is a stab at a working diff (actually as promised, two diffs
against -current, one without backwards compatibility logic).
Background:
Historically (8.0-RELEASE and prior), there was a global rc.conf knob
for ipv6 (ipv6_enable, default=3D"NO") that performed several functions:
a) Enabled (or disabled) ipv6 link-local address for every interface
(auto_linklocal AND -ifdisabled)
b) Enabled (or disabled) ipv6 SLAAC by default for every interface by
setting the global net.inet6.ip6.accept_rtadv=3D1 sysctl
c) inherently specified utilization of a ipv6 address (AAAA) over an
ipv4 address (A) when both were available from a dns query when using
getaddrinfo()
d) Others I can not think of at the moment ?
As well, there has always been a per-interface variable for IPv4 dhcp
(The pseudo-variable of "dhcp" on an ifconfig_IF rc.conf line), but no
global knob.
Now, I propose two new global variables: ipv6_slaac_default_enable,
ipv4_dhcp_default_enable
and several new/updated per-interface pseudo variables: auto, noauto,
accept_rtadv, -accept_rtadv, slaac, noslaac, dhcp, nodhcp
Changelist:
1) New or updated global knob for interface configuration:
ipv6_enable {global} =3D UNDEFINED/YES/NO, Default=3DUNDEFINED
Old, depreciated knob for several ipv6 functions listed above (only
in backwards compatible version) Takes precedence over per-interface
setting (if it exists)
ipv4_dhcp_default_enable {global} =3D YES/NO, Default=3DNO
New, global knob for enabling any interface for dhcp by default that
does not have a per-interface configuration over-ride.
ipv6_slaac_default_enable {global} =3D YES/NO, Default=3DNO
New, global knob for enabling any interface for ipv6 slaac by
default that does not have a per-interface configuration over-ride.
ipv6_prefer {global} =3D YES/NO, Default=3DNO
Removed overloading of ipv6_prefer to no longer mean default to
enable interface for ipv6 (-ifdisabled). This global variable now
just effects rc.d/ip6addrctl behavior. Under seperate cover, I am
proposing changing ipv6_prefer behavior to a more useful
autoconfigured default (if it can be done reliably) to eliminate the
need for the user to need to specify ipv6_prefer at all in most cases.
(Check for global ipv6 address assigned to an up interface) TBD. Stay
tuned...
2) New or updated interface specific pseudo-variables for ifconfig_IF
and/or ifconfig_IF_ipv6:
auto {interface-specific} =3D enable both IPv4 DHCP and IPv6 SLAAC
noauto {interface-specific} =3D no automatic boot-time configuration -
only slightly extended, as this already existed
accept_rtadv {interface-specific} =3D enable SLACC via ipv6 router
advertisement Note: Also an ifconfig IF inet6 parameter
-accept_rtadv {interface-specific} =3D disable SLAAC/ACCEPT_RTADV for
that interface Note: Also an ifconfig IF inet6 parameter
slaac {interface-specific} =3D ALIAS for accept_rtadv, enable SLAAC via
ipv6 router advertisement
noslaac {interface-specific} =3D ALIAS for -accept_rtadv, disable
SLAAC/ACCEPT_RTADV for that interface Note: Only really needed if
global ipv6_slaac_default_enable knob is on
dhcp {interface-specific} =3D enable IPv4 DHCP - No change, just listed
for completeness sake
nodhcp {interface-specific} =3D disable IPv4 DHCP Note: Only really
needed if global ipv4_dhcp_default_enable knob is on
3) On Backwards compatible version:
ipv6_enable is UNDEFINED by default.
If the user has ipv6_enable=3D"NO" defined, this will now DISABLE ipv6
everywhere (just like it used to)
If the user has ipv6_enable=3D"YES" define, this will now ENABLE ipv6
everywhere (just like it used to)
4) Misc changes/fixes:
Changed ifconfig_up() to use ipv6_autoconfif() rather than
re-checking some values for itself, and now allow
ifconfig_em0_ipv6=3D"inet6 2001:db8::1" to work with AND without
user-specified "inet6", as it used to be implied, and most recently
was required, and is now optional.
Changed ifalias_ipv6_[up|down]() to allow with and without user
specified "inet6", and to use the ifconfig_IF_ipv6_aliasX not
ifconfig_IF_aliasX, I can revert this change, but then the "inet6"
component would be required. After thinking about this, it is a toss
up.
Change ipv6_network_interfaces to default to "AUTO" just like
network_interfaces (consistency is the theme)
I am perfectly happy with renaming any of these variable/pseudo
variable names to any consensus approved names, or adding/removing
aliases, etc. No bikesheds allowed. ;)
If anyone requires, I guess I could remove the backwards compatible
logic, but add a new global variable for people that want all
interfaces disabled for ipv6 completely.
As well, I am open to looking at the ifconfig_DEFAULT /
ifconfig_DEFAULT_ipv6 syntax rather than adding
ipv6_slaac_default_enable and ipv4_dhcp_default_enable global knobs if
consensus concurs, but I think the FOO_enable syntax is probably more
desirable. The only thing I am really shooting for is a consistant
set of knobs and behaviors (as much as is sensible), and to allow a
less complicated configuration set for ipv6 rc.conf moving forward.
Once there is consensus, I will take a stab at updating the man page
for rc.conf as well.
Examples:
Example 1: enable IPv4 dhcp, and IPv6 slaac on the em0 interface
(which happens to be the only interface):
In 8.0-RELEASE this would be:
ifconfig_em0=3D"dhcp"
ipv6_enable=3D"YES"
Would now be any of the following (all four are functionally identical):
ifconfig_em0=3D"auto"
or
ifconfig_em0=3D"dhcp slaac"
or
ifconfig_em0=3D"dhcp"
ifconfig_em0_ipv6=3D"slaac"
or
ifconfig_em0=3D"dhcp accept_rtadv"
As well, in the backwards compatible version:
ifconfig_em0=3D"dhcp"
ipv6_enable=3D"YES"
will still work.
Example 2:
(wlan0)- enable IPv4 dhcp, and IPv6 link-local without slaac
(bfe0)- disable IPv4 dhcp, and enable IPv6 slaac
(bfe1)- disable IPv4 dhcp, and enable IPv6 static eui64
(bfe2)- enable IPv4 static with no IPv6 link-local
In 8.0-RELEASE this would be not possible to disable ipv6 slaac on a
per-interface basis, so would require a custom startup script using
ndp to disable. The rest of the configuration would be:
wlans_iwn0=3D"wlan0"
ifconfig_wlan0=3D"wpa dhcp"
ifconfig_bfe0=3D"up"
ipv6_ifconfig_bfe1=3D"2001:db8:1:: eui64"
ifconfig_bfe2=3D"inet 192.168.1.50 netmask 255.255.255.0"
ipv6_enable=3D"YES"
ndp script would be something like:
ndp -i wlan0 nud -accept_rtadv
ndp -i bfe2 disabled
Would now be:
wlans_iwn0=3D"wlan0"
ifconfig_wlan0=3D"wpa dhcp"
ifconfig_bfe0=3D"slaac"
ifconfig_bfe1_ipv6=3D"2001:db8:1:: eui64"
ifconfig_bfe2=3D"inet 192.168.1.50 netmask 255.255.255.0"
ifconfig_bfe2_ipv6=3D"ifdisabled"
I am still trying to track down one bug I have found in my testing
(related to ifconfig and eui64 when no link-local address has yet been
assigned to a down interface), and am still attempting to grok the
$_cfg usage in ifconfig_up(), and I still have several more test cases
to complete, but give it a spin (or read if you prefer), and let me
know if I have gone horribly off track.
As such, this is a work in progress. Comments welcome.
--Thanks!
--Dave Horn
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