Subject: Re: [PATCH] net: ipv6: Make address flushing on ifdown optional - v2

From: Brian Haley <[email-masked]>
Date: Mon, 02 Feb 2015 12:38:19 -0500

On 01/28/2015 11:01 PM, David Ahern wrote:
> Currently, all ipv6 addresses are flushed when the interface is configured
> down, even static address:
> 
...
> diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
> index 2805062c013f..b91b7c8be023 100644
> --- a/include/linux/ipv6.h
> +++ b/include/linux/ipv6.h
> @@ -53,6 +53,7 @@ struct ipv6_devconf {
>  	__s32           ndisc_notify;
>  	__s32		suppress_frag_ndisc;
>  	__s32		accept_ra_mtu;
> +	__s32		flush_addr_on_down;
>  	void		*sysctl;
>  };
...
> diff --git a/include/uapi/linux/ipv6.h b/include/uapi/linux/ipv6.h
> index 437a6a4b125a..ed10d4ba8340 100644
> --- a/include/uapi/linux/ipv6.h
> +++ b/include/uapi/linux/ipv6.h
> @@ -170,6 +170,7 @@ enum {
>  	DEVCONF_ACCEPT_RA_FROM_LOCAL,
>  	DEVCONF_USE_OPTIMISTIC,
>  	DEVCONF_ACCEPT_RA_MTU,
> +	DEVCONF_FLUSH_ON_DOWN,

nit: DEVCONF_FLUSH_ADDR_ON_DOWN to match the name added to ipv6_devconf.

-Brian