netdev - Re: [PATCH bpf-next v2] netkit: use netlink policy for mode and policy attributes validation

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Date: Thu, 26 Oct 2023 08:43:51 -0700
From: Jakub Kicinski <kuba@...nel.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, andrew@...n.ch, toke@...nel.org, toke@...hat.com,
 sdf@...gle.com, daniel@...earbox.net, idosch@...sch.org
Subject: Re: [PATCH bpf-next v2] netkit: use netlink policy for mode and
 policy attributes validation

On Thu, 26 Oct 2023 18:16:59 +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_BINARY,
> +								 netkit_check_policy,
> +								 sizeof(u32)),
> +	[IFLA_NETKIT_MODE]		= NLA_POLICY_VALIDATE_FN(NLA_BINARY,
> +								 netkit_check_mode,
> +								 sizeof(u32)),
> +	[IFLA_NETKIT_PEER_POLICY]	= NLA_POLICY_VALIDATE_FN(NLA_BINARY,
> +								 netkit_check_policy,
> +								 sizeof(u32)),

I vote to leave this code be. It's not perfect. But typing it as binary
is not getting us closer to perfection.