Re: ipv6_addrs_IF aliases in rc.conf(5)

From: Kimmo Paasiala <kpaasial_at_gmail.com>
Date: Sat, 22 Dec 2012 05:09:36 +0200
On Sat, Dec 22, 2012 at 3:19 AM, Kimmo Paasiala <kpaasial_at_gmail.com> wrote:
> On Sat, Dec 22, 2012 at 1:38 AM, Łukasz Wąsikowski
> <lukasz_at_wasikowski.net> wrote:
>> W dniu 2012-12-21 13:23, Kimmo Paasiala pisze:
>>> On Fri, Dec 21, 2012 at 5:43 AM, Kimmo Paasiala <kpaasial_at_gmail.com> wrote:
>>>> On Thu, Dec 20, 2012 at 3:27 PM, Jilles Tjoelker <jilles_at_stack.nl> wrote:
>>>>> On Thu, Dec 20, 2012 at 01:04:34PM +0200, Kimmo Paasiala wrote:
>>>>>> A question related to this for those who have been doing work on the
>>>>>> rc(8) scripts. Can I assume that /usr/bin is available when
>>>>>> network.subr functions are used? Doing calculations on hexadecimal
>>>>>> numbers is going to be very awkward if I can't use for example bc(1).
>>>>>
>>>>> You cannot assume that /usr/bin is available when setting up the
>>>>> network. It may be that /usr is mounted via NFS.
>>>>>
>>>>> You can use hexadecimal numbers (prefixed with 0x) in $((...))
>>>>> expressions. In FreeBSD 9.0 or newer, sh has a printf builtin you can
>>>>> use; in older versions you can use hexdigit and hexprint from
>>>>> network.subr.
>>>>>
>>>>> --
>>>>> Jilles Tjoelker
>>>>
>>>> Thanks, I've rewitten my patch to support ranges. It is attached in
>>>> this message.
>>>>
>>>> Again it's against a very recent 9-STABLE, I still haven't found time
>>>> to see if it applies to CURRENT.
>>>>
>>>> It does allow you to do crazy stuff like
>>>>
>>>> ipv6_addrs_re0="2001:db8:1111:2222::1-ffff/64"
>>>>
>>>> However I didn't find anything to limit the number of aliases in the
>>>> ipv4 version of the function either.
>>>>
>>>> Please test it :)
>>>>
>>>>
>>>> Then a question about the PR
>>>> (http://www.freebsd.org/cgi/query-pr.cgi?pr=174225) I wrote, how can I
>>>> attach this new patch to it? The submit follow up -button fires up my
>>>> email client and I'm not so sure how to submit a new patch for the PR
>>>> in an email in such a way that it appears properly formatted in the
>>>> PR.
>>>>
>>>> Regards,
>>>>
>>>> Kimmo Paasiala
>>>
>>> PR updated with the new patch.
>>
>> Your patch applied cleanly, but it's not working or I am doing something
>> wrong.
>>
>> root_at_freebsd:~ # uname -a
>> FreeBSD freebsd 9.1-PRERELEASE FreeBSD 9.1-PRERELEASE #1 r244567: Fri
>> Dec 21 23:57:28 CET 2012     root_at_freebsd:/usr/obj/usr/src/sys/GENERIC
>> amd64
>>
>> root_at_freebsd:~ # grep -Ev '^[[:space:]]*#|^$' /etc/rc.conf
>> hostname="freebsd"
>> ifconfig_em0="up"
>> ipv4_addrs_em0="192.168.168.20-24/24"
>> defaultrouter="192.168.168.1"
>> ipv6_activate_all_interfaces="YES"
>> ipv6_addrs_em0="2001:6a0:1cb::1-6/64"
>> ipv6_defaultrouter="2001:6a0:1cb::ffff"
>> sshd_enable="YES"
>> dumpdev="NO"
>> named_enable="YES"
>>
>> root_at_freebsd:~ # ifconfig
>> em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>>         options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
>>         ether 08:00:27:02:83:71
>>         inet6 fe80::a00:27ff:fe02:8371%em0 prefixlen 64 scopeid 0x1
>>         inet 192.168.168.20 netmask 0xffffff00 broadcast 192.168.168.255
>>         inet 192.168.168.21 netmask 0xffffffff broadcast 192.168.168.21
>>         inet 192.168.168.22 netmask 0xffffffff broadcast 192.168.168.22
>>         inet 192.168.168.23 netmask 0xffffffff broadcast 192.168.168.23
>>         inet 192.168.168.24 netmask 0xffffffff broadcast 192.168.168.24
>>         nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
>>         media: Ethernet autoselect (1000baseT <full-duplex>)
>>         status: active
>> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
>>         options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
>>         inet6 ::1 prefixlen 128
>>         inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
>>         inet 127.0.0.1 netmask 0xff000000
>>         nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
>>
>> --
>> best regards,
>> Lukasz Wasikowski
>
> You need to first add a single ipv6 address using the
> ifconfig_em0_ipv6 -syntax.
>
> ifconfig_em0_ipv6="2001:6a0:1cb::1/64"
>
> And then this should add the rest of the addresses
>
> ipv6_addrs_em0="2001:6a0:1cb::2-6/64"
>
> It looks like the reason for the difference to ipv4_addrs_IF is that
> the "alias" parameter for ifconfig(8) operates differently for IPv6
> addresses, the first address of an interface can't be added with
> "alias", for IPv4 it does not care. I'll have to dig deeper but that's
> what the problem seems to be.
>
> -Kimmo

The 'alias' parameter of ifconfig(8) is not the problem on the first
ipv6 address, I have verified that. However, there's probably
something in network.subr or /etc/rc.d/netif that I have overlooked
and causes my code to be skipped if there's no ifconfig_IF_ipv6
variable defined in rc.conf(5).

-Kimmo
Received on Sat Dec 22 2012 - 02:09:38 UTC

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