linux-kernel - Re: [PATCH 5/5] netfilter: implement xt

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Message-ID: <alpine.LSU.2.20.1511172351200.13966@nerf40.vanv.qr>
Date:	Tue, 17 Nov 2015 23:56:00 +0100 (CET)
From:	Jan Engelhardt <jengelh@...i.de>
To:	Tejun Heo <tj@...nel.org>
cc:	davem@...emloft.net, pablo@...filter.org, kaber@...sh.net,
	kadlec@...ckhole.kfki.hu, lizefan@...wei.com, hannes@...xchg.org,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-team@...com,
	daniel@...earbox.net, daniel.wagner@...-carit.de,
	nhorman@...driver.com
Subject: Re: [PATCH 5/5] netfilter: implement xt_cgroup2 match


On Tuesday 2015-11-17 20:40, Tejun Heo wrote:
>@@ -0,0 +1,14 @@
>+#ifndef _XT_CGROUP2_H
>+#define _XT_CGROUP2_H
>+
>+#include <linux/types.h>
>+
>+struct xt_cgroup2_info {
>+	char				path[PATH_MAX];
>+	__u8				invert;

Should <linux/limits.h> be included? (For PATH_MAX)

>+	/* kernel internal data */
>+	void				*priv;
>+};

void *priv __attribute__((aligned(8)));

>+static bool cgroup2_mt(const struct sk_buff *skb, struct xt_action_param *par)
>+{
>+	const struct xt_cgroup2_info *info = par->matchinfo;
>+	struct cgroup *ancestor = info->priv;

There is no modification planned on the cgroup, so this too can be const struct
cgroup * if-and-when cgroup_is_descendant is made to take const ptrs as well.

>+	if (!skb->sk || !sk_fullsock(skb->sk))
>+		return false;
>+
>+	return cgroup_is_descendant(skb->sk->sk_cgroup, ancestor) ^ info->invert;
>+}

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