netdev - Re: [PATCH 1/1] net namespace: dynamically configure new net namespace inherit net config

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Date:	Thu, 8 Oct 2015 23:13:19 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	yzhu1 <Yanjun.Zhu@...driver.com>
Cc:	netdev <netdev@...r.kernel.org>, David Miller <davem@...emloft.net>
Subject: Re: [PATCH 1/1] net namespace: dynamically configure new net
 namespace inherit net config

On Thu, Oct 8, 2015 at 2:44 AM, yzhu1 <Yanjun.Zhu@...driver.com> wrote:
> Hi, Miller
>
> Would you like to check this patch?

I explained to you way back in June what some of the biggest oversights
were, here with your work.  And you have changed nothing but yet expect
a reply from maintainers who are extremely busy, simply by resending
the same old patch over and over.  Do you not see why this approach will
not work?

Paul.
--

>
> Thanks a lot.
> Zhu Yanjun
>
> On 06/26/2015 05:37 PM, Zhu Yanjun wrote:
>>
>> The new net namespace can inherit from the original net config, or
>> the current net config. As such, a config is needed to decide where
>> the new namespace inherit from.
>>
>> Signed-off-by: Zhu Yanjun <Yanjun.Zhu@...driver.com>
>> ---
>>   init/Kconfig       |  9 +++++++++
>>   net/ipv4/devinet.c | 13 +++++++++++++
>>   2 files changed, 22 insertions(+)
>>
>> diff --git a/init/Kconfig b/init/Kconfig
>> index dc24dec..fab8c41 100644
>> --- a/init/Kconfig
>> +++ b/init/Kconfig
>> @@ -1212,6 +1212,15 @@ config NET_NS
>>           Allow user space to create what appear to be multiple instances
>>           of the network stack.
>>   +config NET_NS_INHERIT_ORIGINAL
>> +       bool "New network namespace inherits from original net config"
>> +       depends on NET_NS
>> +       default n
>> +       help
>> +         Allow new network namespace inherit from original net config.
>> +         If no, the new network namespace inherits from the current net
>> +         config including the modified net config.
>> +
>>   endif # NAMESPACES
>>     config SCHED_AUTOGROUP
>> diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
>> index 419d23c..cf635e4 100644
>> --- a/net/ipv4/devinet.c
>> +++ b/net/ipv4/devinet.c
>> @@ -2271,6 +2271,7 @@ static __net_init int devinet_init_net(struct net
>> *net)
>>   #endif
>>         err = -ENOMEM;
>> +#ifndef CONFIG_NET_NS_INHERIT_ORIGINAL
>>         all = &ipv4_devconf;
>>         dflt = &ipv4_devconf_dflt;
>>   @@ -2282,6 +2283,15 @@ static __net_init int devinet_init_net(struct net
>> *net)
>>                 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt),
>> GFP_KERNEL);
>>                 if (!dflt)
>>                         goto err_alloc_dflt;
>> +#else
>> +       all = kmemdup(&ipv4_devconf, sizeof(ipv4_devconf), GFP_KERNEL);
>> +       if (!all)
>> +               goto err_alloc_all;
>> +
>> +       dflt = kmemdup(&ipv4_devconf_dflt, sizeof(ipv4_devconf_dflt),
>> GFP_KERNEL);
>> +       if (!dflt)
>> +               goto err_alloc_dflt;
>> +#endif
>>     #ifdef CONFIG_SYSCTL
>>                 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
>> @@ -2292,7 +2302,10 @@ static __net_init int devinet_init_net(struct net
>> *net)
>>                 tbl[0].extra1 = all;
>>                 tbl[0].extra2 = net;
>>   #endif
>> +
>> +#ifndef CONFIG_NET_NS_INHERIT_ORIGINAL
>>         }
>> +#endif
>>     #ifdef CONFIG_SYSCTL
>>         err = __devinet_sysctl_register(net, "all", all);
>
>
> --
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