netdev - Re: [PATCH net-next 1/2] net: ipv6: add tokenized interface identifier support

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Date:	Thu, 04 Apr 2013 18:02:02 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	hannes@...essinduktion.org
CC:	davem@...emloft.net, netdev@...r.kernel.org,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH net-next 1/2] net: ipv6: add tokenized interface identifier
 support

On 04/04/2013 05:58 PM, Hannes Frederic Sowa wrote:
> On Thu, Apr 04, 2013 at 04:37:37PM +0200, Daniel Borkmann wrote:
>> This patch adds support for tokenized IIDs, that allow for
>> administrators to assign well-known host-part addresses to
>> nodes whilst still obtaining global network prefix from
>> Router Advertisements. It is currently in IETF RFC draft
>> status [1]:
>>
>>    The primary target for such support is server platforms
>>    where addresses are usually manually configured, rather
>>    than using DHCPv6 or SLAAC. By using tokenised identifiers,
>>    hosts can still determine their network prefix by use of
>>    SLAAC, but more readily be automatically renumbered should
>>    their network prefix change.
>>
>>   [1] http://tools.ietf.org/html/draft-chown-6man-tokenised-ipv6-identifiers-02
>>
>> The implementation is partially based on top of Mark K.
>> Thompson's proof of concept. Successfully tested by myself.
>
> Cool, this looks really useful.
>
> One comment so far:
>
>> +#define IPV6_ADDR_SCOPE_TYPE(scope)	((scope) << 16)
>> +
>
> I think we should not export this macro but instead...
>
>> +	/* Well, that's kinda nasty ... */
>> +	list_for_each_entry(ifp, &idev->addr_list, if_list) {
>> +		spin_lock(&ifp->lock);
>> +		if (__ipv6_addr_type(&ifp->addr) &
>> +		    IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)) {
>
> ...use
>
> if (ipv6_addr_src_scope(&ifp->addr) == IPV6_ADDR_SCOPE_GLOBAL) {
>
> here.
>
>> diff --git a/net/ipv6/addrconf_core.c b/net/ipv6/addrconf_core.c
>> index d051e5f..8b723de 100644
>> --- a/net/ipv6/addrconf_core.c
>> +++ b/net/ipv6/addrconf_core.c
>> @@ -6,8 +6,6 @@
>>   #include <linux/export.h>
>>   #include <net/ipv6.h>
>>
>> -#define IPV6_ADDR_SCOPE_TYPE(scope)	((scope) << 16)
>> -
>
> This hunk can be dropped then.

Thanks for the review Hannes, I'll do that in a version 2 of the set.

Thanks,

Daniel
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