lkml.org 
[lkml]   [2014]   [Sep]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC PATCH net-next v2 0/5] netns: allow to identify peer netns
Le 26/09/2014 03:58, Cong Wang a écrit :
> On Thu, Sep 25, 2014 at 1:53 AM, Nicolas Dichtel
> <nicolas.dichtel@6wind.com> wrote:
>> Le 24/09/2014 18:48, Cong Wang a écrit :
>>
>>> On Wed, Sep 24, 2014 at 9:31 AM, Nicolas Dichtel
>>> <nicolas.dichtel@6wind.com> wrote:
>>>>>
>>>>> I think in this case your ID's are still available, but aren't you
>>>>> providing a new way
>>>>> for the inner netns device to escape which we are trying to avoid?
>>>>
>>>>
>>>> It's why the ids depend on user ns. Only if user ns are the same we allow
>>>> to
>>>> get an id for a peer netns.
>>>
>>>
>>> Too late, userns is relatively new, relying on it breaks our existing
>>> assumption.
>>>
>> I don't get your point. netns has been added in kernel after user ns:
>> acce292c82d4 user namespace: add the framework => 2.6.23
>> 5f256becd868 [NET]: Basic network namespace infrastructure. => 2.6.24
>
> Was it complete on 2.6.x? I doubt...
>
> https://lkml.org/lkml/2014/8/20/826
>
> As at Linux 3.8, most relevant subsystems supported user names‐
> paces, but a number of filesystems did not have the infrastruc‐
> ture needed to map user and group IDs between user namespaces.
> Linux 3.9 added the required infrastructure support for many of
> the remaining unsupported filesystems (Plan 9 (9P), Andrew File
> System (AFS), Ceph, CIFS, CODA, NFS, and OCFS2). Linux 3.11
> added support the last of the unsupported major filesystems, XFS.
>
>
>>
>> In the kernel, each netns is linked with a user ns.
>
> Are you saying every time we create a netns we have a new userns?
> This doesn't make sense for me.
>
No. I mean that each netns depends on a userns.
See include/net/net_namespace.h:
struct net {
[snip]
struct user_namespace *user_ns; /* Owning user namespace */
[snip]
}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2014-09-26 16:21    [W:1.715 / U:0.612 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site