netdev - Re: [PATCH bpf-next 2/2] netkit: use netlink policy for mode and policy attributes validation

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Message-ID: <ZTpzfckQ5n4o2F7D@shredder>
Date: Thu, 26 Oct 2023 17:11:09 +0300
From: Ido Schimmel <idosch@...sch.org>
To: Nikolay Aleksandrov <razor@...ckwall.org>
Cc: bpf@...r.kernel.org, jiri@...nulli.us, netdev@...r.kernel.org,
	martin.lau@...ux.dev, ast@...nel.org, andrii@...nel.org,
	john.fastabend@...il.com, kuba@...nel.org, andrew@...n.ch,
	toke@...nel.org, toke@...hat.com, sdf@...gle.com,
	daniel@...earbox.net
Subject: Re: [PATCH bpf-next 2/2] netkit: use netlink policy for mode and
 policy attributes validation

On Thu, Oct 26, 2023 at 12:41:06PM +0300, Nikolay Aleksandrov wrote:
>  static const struct nla_policy netkit_policy[IFLA_NETKIT_MAX + 1] = {
>  	[IFLA_NETKIT_PEER_INFO]		= { .len = sizeof(struct ifinfomsg) },
> -	[IFLA_NETKIT_POLICY]		= { .type = NLA_U32 },
> -	[IFLA_NETKIT_MODE]		= { .type = NLA_U32 },
> -	[IFLA_NETKIT_PEER_POLICY]	= { .type = NLA_U32 },
> +	[IFLA_NETKIT_POLICY]		= NLA_POLICY_VALIDATE_FN(NLA_U32,
> +								 netkit_check_policy),

Nik, it's problematic to use NLA_POLICY_VALIDATE_FN() with anything
other than NLA_BINARY. See commit 9e17f99220d1 ("net/sched: act_mpls:
Fix warning during failed attribute validation").

> +	[IFLA_NETKIT_MODE]		= NLA_POLICY_VALIDATE_FN(NLA_U32,
> +								 netkit_check_mode),
> +	[IFLA_NETKIT_PEER_POLICY]	= NLA_POLICY_VALIDATE_FN(NLA_U32,
> +								 netkit_check_policy),
>  	[IFLA_NETKIT_PRIMARY]		= { .type = NLA_REJECT,
>  					    .reject_message = "Primary attribute is read-only" },
>  };
> -- 
> 2.38.1
> 
>