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From Wido den Hollander <w...@widodh.nl>
Subject IPv6 progress in Basic Networking
Date Wed, 20 Apr 2016 15:24:16 GMT
Hi,

Lately I've been working on IPv6 integration on CloudStack. Not much code has
been written (non actually), my work has mainly been getting things straight in
my head.

Honestly, the work has been focused on the use-case at PCextreme Aurora Compute:
- Basic Networking
- Single IPv6 address per Instance
- Security Grouping on IPv6
- IPv6 Prefix Delegation

Most of the things are still described here:
https://cwiki.apache.org/confluence/display/CLOUDSTACK/IPv6+in+Basic+Networking

What I have working at PCextreme currently is:
- IPv6 using SLAAC
- DHCPv6 Prefix Delegation using ISC Kea

The Kea configuration I'm using for my test is available on Github:
https://gist.github.com/wido/202b09dd9999574e016f6e99798036cd

On my Instance I'm able to get an address and a prefix:

$ ip -6 addr show dev eth0

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 2a00:f10:305:0:432:b2ff:fe00:479/64 scope global dynamic 
       valid_lft 2591904sec preferred_lft 604704sec
    inet6 fe80::432:b2ff:fe00:479/64 scope link 
       valid_lft forever preferred_lft forever

$ dhclient -6 -P -d -v eth0

RCV: Reply message on eth0 from fe80::8618:8802:c5f6:6029.
RCV:  X-- IA_PD b2:00:04:79
RCV:  | X-- starts 1461164082
RCV:  | X-- t1 - renew  +1000
RCV:  | X-- t2 - rebind +2000
RCV:  | X-- [Options]
RCV:  | | X-- IAPREFIX 2a00:f10:500::/60
RCV:  | | | X-- Preferred lifetime 86400.
RCV:  | | | X-- Max lifetime 172800.

This is know *ALL* happening outside the scope of CloudStack, but my next steps
are to start writing code.

For IPv6 there is *NO* need to store addresses in a database. Using the /64
subnet + the MAC address you can calculate the address the Instance will obtain
using SLAAC (Stateless address autoconfiguration).

Looking from the database perspective, using the IPv6 information in the 'vlan'
and the 'ip6_cidr' field.

ip6_cidr should *always* be a /64 and from there you can calculate the
Instance's address.

The 'listNics' API call can calculate the 'ip6address' for the response. Using
the macaddress and the ip6cidr this can easily be calculated.

The security grouping part is second, the same goes for the Prefix Delegation
support. Those will require more code. But just the IPv6 address in the response
is easy to do.

This means that DHCPv6 is *ONLY* needed when Prefix Delegation (IA_PD) is used,
but otherwise it is just SLAAC. Easy and simple to deploy.

Wido

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