Subject: Re: [PATCH v2 net-next] net: ipv6: Add sysctl entry to disable MTU updates from RA

From: Daniel Borkmann <[email-masked]>
Date: Mon, 19 Jan 2015 23:10:30 +0100

On 01/19/2015 10:36 PM, Harout Hedeshian wrote:
...
> diff --git a/include/uapi/linux/sysctl.h b/include/uapi/linux/sysctl.h
> index 0956373..45e4fcf 100644
> --- a/include/uapi/linux/sysctl.h
> +++ b/include/uapi/linux/sysctl.h
> @@ -570,6 +570,7 @@ enum {
>   	NET_IPV6_PROXY_NDP=23,
>   	NET_IPV6_ACCEPT_SOURCE_ROUTE=25,
>   	NET_IPV6_ACCEPT_RA_FROM_LOCAL=26,
> +	NET_IPV6_ACCEPT_RA_MTU=27,
>   	__NET_IPV6_MAX
>   };
>
> diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
> index 7e7746a..16091e5 100644
> --- a/kernel/sysctl_binary.c
> +++ b/kernel/sysctl_binary.c
> @@ -523,6 +523,7 @@ static const struct bin_table bin_net_ipv6_conf_var_table[] = {
>   	{ CTL_INT,	NET_IPV6_PROXY_NDP,			"proxy_ndp" },
>   	{ CTL_INT,	NET_IPV6_ACCEPT_SOURCE_ROUTE,		"accept_source_route" },
>   	{ CTL_INT,	NET_IPV6_ACCEPT_RA_FROM_LOCAL,		"accept_ra_from_local" },
> +	{ CTL_INT,	NET_IPV6_ACCEPT_RA_MTU,			"accept_ra_mtu" },
>   	{}
>   };

Hm, afaik, the binary sysctl interface is deprecated and nothing
should be adding entries there anymore. I believe you copied this
over from commit d9333196572 ("ipv6: Allow accepting RA from local
IP addresses.")? :/