lkml.org 
[lkml]   [2009]   [Feb]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2] bonding: move IPv6 support into a separate kernel module
Chuck Lever wrote:
> On Feb 26, 2009, at Feb 26, 2009, 2:28 PM, Brian Haley wrote:
>> Jay Vosburgh wrote:
>>>>>> I've been fooling with the disable_ipv6 sysctl, and one issue is
>>>>>> that, at least on the distro I'm testing on (SLES), it's not
>>>>>> picked up
>>>>>> from /etc/sysctl.conf at boot time (presumably because ipv6 isn't
>>>>>> loaded
>>>>>> yet, although I haven't really checked).
>>>>> Correct, that's the problem.
>>>>>
>>>>> We could create a blocker bitmap. Two sysctls, "block_af" and
>>>>> "unblock_af". You write the AF_foo value for the protocol there and
>>>>> it sets or clears the assosciated bit in the internal blocker bitmap.
>>>>>
>>>>> Things like sys_socket() et al. key off of this.
>>>> I'm open to suggestions at this point in time, I just don't see how
>>>> this
>>>> will solve the bonding problem since it still wouldn't load, right?
>>> It would permit users to load ipv6 (thus allowing bonding to
>>> load), but prevent ipv6 from actually doing anything. (because
>>> sys_socket, e.g., won't open an ipv6 socket if block_af includes ipv6).
>>
>> Right, but it doesn't help someone that changed /etc/modprobe.conf to
>> have "install ipv6 /bin/true" - they'll have to stop doing that.
>>
>> I think changing ipv6 to support a disable_ipv6 module parameter like
>> Vlad suggested would work, as long as we're not worried about someone
>> opening an AF_INET6 socket - even if they do they won't get anywhere.
>
> In this case, if IPV6ONLY is set on an AF_INET6 listener, it should
> still get AF_INET traffic, correct?

No. IPV6ONLY means just that, native IPv6 traffic only. That socket
would sit idle.

-vlad

>
>> That, along with the patch below to actually not add the addresses,
>> would work (sorry in advance for using an attachment). I'll get
>> started on that...
>>
>> -Brian
>>
>>
>> --
>>
>> The disable_ipv6 knob was meant to be used for the kernel to disable
>> IPv6 on an interface when DAD failed for the link-local address based
>> on the MAC, but we should also be able to administratively disable it
>> on an interface, or the entire system. This patch fixes the
>> per-interface problem.
>>
>> Signed-off-by: Brian Haley <brian.haley@hp.com>
>> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
>> index f8f76d6..90f2a81 100644
>> --- a/net/ipv6/addrconf.c
>> +++ b/net/ipv6/addrconf.c
>> @@ -603,6 +603,11 @@ ipv6_add_addr(struct inet6_dev *idev, const
>> struct in6_addr *addr, int pfxlen,
>> goto out2;
>> }
>>
>> + if (idev->cnf.disable_ipv6) {
>> + err = -EPERM;
>> + goto out2;
>> + }
>> +
>> write_lock(&addrconf_hash_lock);
>>
>> /* Ignore adding duplicate addresses on an interface */
>



\
 
 \ /
  Last update: 2009-02-26 21:03    [W:0.659 / U:1.148 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site