Re: [PATCH 11/14] networking: Update to register_net_sysctl_sz

[Luis Chamberlain]

On Wed, Jul 26, 2023 at 04:06:31PM +0200, Joel Granados wrote:
> This is part of the effort to remove the sentinel (last empty) element
> from the ctl_table arrays. We update to the new function and pass it the
> array size. Care is taken to mirror the NULL assignments with a size of
> zero (for the unprivileged users). An additional size function was added
> to the following files in order to calculate the size of an array that
> is defined in another file:
>     include/net/ipv6.h
>     net/ipv6/icmp.c
>     net/ipv6/route.c
>     net/ipv6/sysctl_net_ipv6.c
> 

Same here as with the other patches, the "why" and size impact should go here.
I'll skip mentioning that in the other patches.

> diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
> index bf6e81d56263..5bad14b3c71e 100644
> --- a/net/mpls/af_mpls.c
> +++ b/net/mpls/af_mpls.c
> @@ -1396,6 +1396,40 @@ static const struct ctl_table mpls_dev_table[] = {
>  	{ }
>  };
>  
> +static int mpls_platform_labels(struct ctl_table *table, int write,
> +				void *buffer, size_t *lenp, loff_t *ppos);
> +#define MPLS_NS_SYSCTL_OFFSET(field)		\
> +	(&((struct net *)0)->field)
> +
> +static const struct ctl_table mpls_table[] = {
> +	{
> +		.procname	= "platform_labels",
> +		.data		= NULL,
> +		.maxlen		= sizeof(int),
> +		.mode		= 0644,
> +		.proc_handler	= mpls_platform_labels,
> +	},
> +	{
> +		.procname	= "ip_ttl_propagate",
> +		.data		= MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate),
> +		.maxlen		= sizeof(int),
> +		.mode		= 0644,
> +		.proc_handler	= proc_dointvec_minmax,
> +		.extra1		= SYSCTL_ZERO,
> +		.extra2		= SYSCTL_ONE,
> +	},
> +	{
> +		.procname	= "default_ttl",
> +		.data		= MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl),
> +		.maxlen		= sizeof(int),
> +		.mode		= 0644,
> +		.proc_handler	= proc_dointvec_minmax,
> +		.extra1		= SYSCTL_ONE,
> +		.extra2		= &ttl_max,
> +	},
> +	{ }
> +};

Unless we hear otherwise from networking folks, I think this move alone
should probably go as a separate patch with no functional changes to
make the changes easier to review / bisect.

  Luis