Commit 3bb398d9 authored Apr 14, 2016 by Pablo Neira Ayuso

netfilter: nf_ct_helper: disable automatic helper assignment



Four years ago we introduced a new sysctl knob to disable automatic
helper assignment in 72110dfaa907 ("netfilter: nf_ct_helper: disable
automatic helper assignment"). This knob kept this behaviour enabled by
default to remain conservative.

This measure was introduced to provide a secure way to configure
iptables and connection tracking helpers through explicit rules.

Give the time we have waited for this, let's turn off this by default
now, worse case users still have a chance to recover the former
behaviour by explicitly enabling this back through sysctl.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

parent e701001e

net/netfilter/nf_conntrack_helper.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -38,10 +38,10 @@ unsigned int nf_ct_helper_hsize __read_mostly;
		EXPORT_SYMBOL_GPL(nf_ct_helper_hsize);
		static unsigned int nf_ct_helper_count __read_mostly;

		static bool nf_ct_auto_assign_helper __read_mostly = true;
		static bool nf_ct_auto_assign_helper __read_mostly = false;
		module_param_named(nf_conntrack_helper, nf_ct_auto_assign_helper, bool, 0644);
		MODULE_PARM_DESC(nf_conntrack_helper,
		"Enable automatic conntrack helper assignment (default 1)");
		"Enable automatic conntrack helper assignment (default 0)");

		#ifdef CONFIG_SYSCTL
		static struct ctl_table helper_sysctl_table[] = {