linux-kernel - Re: [PATCH 11/14] networking: Update to register_net_sysctl

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Message-ID: <ZMFgZHsnhrXNIQ53@bombadil.infradead.org>
Date:   Wed, 26 Jul 2023 11:05:24 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Joel Granados <j.granados@...sung.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        Mat Martineau <martineau@...nel.org>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Xin Long <lucien.xin@...il.com>,
        Karsten Graul <kgraul@...ux.ibm.com>,
        Wenjia Zhang <wenjia@...ux.ibm.com>,
        Jan Karcher <jaka@...ux.ibm.com>, willy@...radead.org,
        keescook@...omium.org, josh@...htriplett.org,
        "D. Wythe" <alibuda@...ux.alibaba.com>,
        Tony Lu <tonylu@...ux.alibaba.com>,
        Wen Gu <guwen@...ux.alibaba.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-wpan@...r.kernel.org,
        mptcp@...ts.linux.dev, linux-rdma@...r.kernel.org,
        rds-devel@....oracle.com, linux-sctp@...r.kernel.org,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH 11/14] networking: Update to register_net_sysctl_sz

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