net/ipv6/sysctl_net_ipv6.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
  *
  * Changes:
  * YOSHIFUJI Hideaki @USAGI:	added icmp sysctl table.
  */

 #include <linux/mm.h>
 #include <linux/sysctl.h>
 #include <linux/in6.h>
 #include <linux/ipv6.h>
 #include <linux/slab.h>
 #include <linux/export.h>
 #include <net/ndisc.h>
 #include <net/ipv6.h>
 #include <net/addrconf.h>
 #include <net/inet_frag.h>
 #include <net/netevent.h>
 #include <net/ip_fib.h>
 #ifdef CONFIG_NETLABEL
 #include <net/calipso.h>
 #endif
 #include <linux/ioam6.h>

 static int two = 2;
 static int three = 3;
 static int flowlabel_reflect_max = 0x7;
 static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
 static u32 rt6_multipath_hash_fields_all_mask =
 	FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
 static u32 ioam6_id_max = IOAM6_DEFAULT_ID;
 static u64 ioam6_id_wide_max = IOAM6_DEFAULT_ID_WIDE;

 static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write,
 					  void *buffer, size_t *lenp, loff_t *ppos)
 {
 	struct net *net;
 	int ret;

 	net = container_of(table->data, struct net,
 			   ipv6.sysctl.multipath_hash_policy);
 	ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 	if (write && ret == 0)
 		call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);

 	return ret;
 }

 static int
 proc_rt6_multipath_hash_fields(struct ctl_table *table, int write, void *buffer,
 			       size_t *lenp, loff_t *ppos)
 {
 	struct net *net;
 	int ret;

 	net = container_of(table->data, struct net,
 			   ipv6.sysctl.multipath_hash_fields);
 	ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
 	if (write && ret == 0)
 		call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);

 	return ret;
 }

 static struct ctl_table ipv6_table_template[] = {
 	{
 		.procname	= "bindv6only",
 		.data		= &init_net.ipv6.sysctl.bindv6only,
 		.maxlen		= sizeof(u8),
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "anycast_src_echo_reply",
 		.data		= &init_net.ipv6.sysctl.anycast_src_echo_reply,
 		.maxlen		= sizeof(u8),
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "flowlabel_consistency",
 		.data		= &init_net.ipv6.sysctl.flowlabel_consistency,
 		.maxlen		= sizeof(u8),
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "auto_flowlabels",
 		.data		= &init_net.ipv6.sysctl.auto_flowlabels,
 		.maxlen		= sizeof(u8),
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 		.extra2		= &auto_flowlabels_max
 	},
 	{
 		.procname	= "fwmark_reflect",
 		.data		= &init_net.ipv6.sysctl.fwmark_reflect,
 		.maxlen		= sizeof(u8),
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "idgen_retries",
 		.data		= &init_net.ipv6.sysctl.idgen_retries,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec,
 	},
 	{
 		.procname	= "idgen_delay",
 		.data		= &init_net.ipv6.sysctl.idgen_delay,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_jiffies,
 	},
 	{
 		.procname	= "flowlabel_state_ranges",
 		.data		= &init_net.ipv6.sysctl.flowlabel_state_ranges,
 		.maxlen		= sizeof(u8),
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "ip_nonlocal_bind",
 		.data		= &init_net.ipv6.sysctl.ip_nonlocal_bind,
 		.maxlen		= sizeof(u8),
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 	},
 	{
 		.procname	= "flowlabel_reflect",
 		.data		= &init_net.ipv6.sysctl.flowlabel_reflect,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ZERO,
 		.extra2		= &flowlabel_reflect_max,
 	},
 	{
 		.procname	= "max_dst_opts_number",
 		.data		= &init_net.ipv6.sysctl.max_dst_opts_cnt,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec
 	},
 	{
 		.procname	= "max_hbh_opts_number",
 		.data		= &init_net.ipv6.sysctl.max_hbh_opts_cnt,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec
 	},
 	{
 		.procname	= "max_dst_opts_length",
 		.data		= &init_net.ipv6.sysctl.max_dst_opts_len,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec
 	},
 	{
 		.procname	= "max_hbh_length",
 		.data		= &init_net.ipv6.sysctl.max_hbh_opts_len,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec
 	},
 	{
 		.procname	= "fib_multipath_hash_policy",
 		.data		= &init_net.ipv6.sysctl.multipath_hash_policy,
 		.maxlen		= sizeof(u8),
 		.mode		= 0644,
 		.proc_handler   = proc_rt6_multipath_hash_policy,
 		.extra1		= SYSCTL_ZERO,
 		.extra2		= &three,
 	},
 	{
 		.procname	= "fib_multipath_hash_fields",
 		.data		= &init_net.ipv6.sysctl.multipath_hash_fields,
 		.maxlen		= sizeof(u32),
 		.mode		= 0644,
 		.proc_handler	= proc_rt6_multipath_hash_fields,
 		.extra1		= SYSCTL_ONE,
 		.extra2		= &rt6_multipath_hash_fields_all_mask,
 	},
 	{
 		.procname	= "seg6_flowlabel",
 		.data		= &init_net.ipv6.sysctl.seg6_flowlabel,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec
 	},
 	{
 		.procname	= "fib_notify_on_flag_change",
 		.data		= &init_net.ipv6.sysctl.fib_notify_on_flag_change,
 		.maxlen		= sizeof(u8),
 		.mode		= 0644,
 		.proc_handler	= proc_dou8vec_minmax,
 		.extra1         = SYSCTL_ZERO,
 		.extra2         = &two,
 	},
 	{
 		.procname	= "ioam6_id",
 		.data		= &init_net.ipv6.sysctl.ioam6_id,
 		.maxlen		= sizeof(u32),
 		.mode		= 0644,
 		.proc_handler	= proc_douintvec_minmax,
 		.extra2		= &ioam6_id_max,
 	},
 	{
 		.procname	= "ioam6_id_wide",
 		.data		= &init_net.ipv6.sysctl.ioam6_id_wide,
 		.maxlen		= sizeof(u64),
 		.mode		= 0644,
 		.proc_handler	= proc_doulongvec_minmax,
 		.extra2		= &ioam6_id_wide_max,
 	},
 	{ }
 };

 static struct ctl_table ipv6_rotable[] = {
 	{
 		.procname	= "mld_max_msf",
 		.data		= &sysctl_mld_max_msf,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec
 	},
 	{
 		.procname	= "mld_qrv",
 		.data		= &sysctl_mld_qrv,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ONE
 	},
 #ifdef CONFIG_NETLABEL
 	{
 		.procname	= "calipso_cache_enable",
 		.data		= &calipso_cache_enabled,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec,
 	},
 	{
 		.procname	= "calipso_cache_bucket_size",
 		.data		= &calipso_cache_bucketsize,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec,
 	},
 #endif /* CONFIG_NETLABEL */
 	{ }
 };

 static int __net_init ipv6_sysctl_net_init(struct net *net)
 {
 	struct ctl_table *ipv6_table;
 	struct ctl_table *ipv6_route_table;
 	struct ctl_table *ipv6_icmp_table;
 	int err, i;

 	err = -ENOMEM;
 	ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
 			     GFP_KERNEL);
 	if (!ipv6_table)
 		goto out;
 	/* Update the variables to point into the current struct net */
 	for (i = 0; i < ARRAY_SIZE(ipv6_table_template) - 1; i++)
 		ipv6_table[i].data += (void *)net - (void *)&init_net;

 	ipv6_route_table = ipv6_route_sysctl_init(net);
 	if (!ipv6_route_table)
 		goto out_ipv6_table;

 	ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
 	if (!ipv6_icmp_table)
 		goto out_ipv6_route_table;

 	net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
 	if (!net->ipv6.sysctl.hdr)
 		goto out_ipv6_icmp_table;

 	net->ipv6.sysctl.route_hdr =
 		register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
 	if (!net->ipv6.sysctl.route_hdr)
 		goto out_unregister_ipv6_table;

 	net->ipv6.sysctl.icmp_hdr =
 		register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
 	if (!net->ipv6.sysctl.icmp_hdr)
 		goto out_unregister_route_table;

 	err = 0;
 out:
 	return err;
 out_unregister_route_table:
 	unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 out_unregister_ipv6_table:
 	unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
 out_ipv6_icmp_table:
 	kfree(ipv6_icmp_table);
 out_ipv6_route_table:
 	kfree(ipv6_route_table);
 out_ipv6_table:
 	kfree(ipv6_table);
 	goto out;
 }

 static void __net_exit ipv6_sysctl_net_exit(struct net *net)
 {
 	struct ctl_table *ipv6_table;
 	struct ctl_table *ipv6_route_table;
 	struct ctl_table *ipv6_icmp_table;

 	ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
 	ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
 	ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;

 	unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
 	unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
 	unregister_net_sysctl_table(net->ipv6.sysctl.hdr);

 	kfree(ipv6_table);
 	kfree(ipv6_route_table);
 	kfree(ipv6_icmp_table);
 }

 static struct pernet_operations ipv6_sysctl_net_ops = {
 	.init = ipv6_sysctl_net_init,
 	.exit = ipv6_sysctl_net_exit,
 };

 static struct ctl_table_header *ip6_header;

 int ipv6_sysctl_register(void)
 {
 	int err = -ENOMEM;

 	ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
 	if (!ip6_header)
 		goto out;

 	err = register_pernet_subsys(&ipv6_sysctl_net_ops);
 	if (err)
 		goto err_pernet;
 out:
 	return err;

 err_pernet:
 	unregister_net_sysctl_table(ip6_header);
 	goto out;
 }

 void ipv6_sysctl_unregister(void)
 {
 	unregister_net_sysctl_table(ip6_header);
 	unregister_pernet_subsys(&ipv6_sysctl_net_ops);
 }
	// SPDX-License-Identifier: GPL-2.0
	/*
	* sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
	*
	* Changes:
	* YOSHIFUJI Hideaki @USAGI: added icmp sysctl table.
	*/

	#include <linux/mm.h>
	#include <linux/sysctl.h>
	#include <linux/in6.h>
	#include <linux/ipv6.h>
	#include <linux/slab.h>
	#include <linux/export.h>
	#include <net/ndisc.h>
	#include <net/ipv6.h>
	#include <net/addrconf.h>
	#include <net/inet_frag.h>
	#include <net/netevent.h>
	#include <net/ip_fib.h>
	#ifdef CONFIG_NETLABEL
	#include <net/calipso.h>
	#endif
	#include <linux/ioam6.h>

	static int two = 2;
	static int three = 3;
	static int flowlabel_reflect_max = 0x7;
	static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
	static u32 rt6_multipath_hash_fields_all_mask =
	FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
	static u32 ioam6_id_max = IOAM6_DEFAULT_ID;
	static u64 ioam6_id_wide_max = IOAM6_DEFAULT_ID_WIDE;

	static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write,
	void buffer, size_t lenp, loff_t *ppos)
	{
	struct net *net;
	int ret;

	net = container_of(table->data, struct net,
	ipv6.sysctl.multipath_hash_policy);
	ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
	if (write && ret == 0)
	call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);

	return ret;
	}

	static int
	proc_rt6_multipath_hash_fields(struct ctl_table table, int write, void buffer,
	size_t lenp, loff_t ppos)
	{
	struct net *net;
	int ret;

	net = container_of(table->data, struct net,
	ipv6.sysctl.multipath_hash_fields);
	ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
	if (write && ret == 0)
	call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);

	return ret;
	}

	static struct ctl_table ipv6_table_template[] = {
	{
	.procname = "bindv6only",
	.data = &init_net.ipv6.sysctl.bindv6only,
	.maxlen = sizeof(u8),
	.mode = 0644,
	.proc_handler = proc_dou8vec_minmax,
	},
	{
	.procname = "anycast_src_echo_reply",
	.data = &init_net.ipv6.sysctl.anycast_src_echo_reply,
	.maxlen = sizeof(u8),
	.mode = 0644,
	.proc_handler = proc_dou8vec_minmax,
	},
	{
	.procname = "flowlabel_consistency",
	.data = &init_net.ipv6.sysctl.flowlabel_consistency,
	.maxlen = sizeof(u8),
	.mode = 0644,
	.proc_handler = proc_dou8vec_minmax,
	},
	{
	.procname = "auto_flowlabels",
	.data = &init_net.ipv6.sysctl.auto_flowlabels,
	.maxlen = sizeof(u8),
	.mode = 0644,
	.proc_handler = proc_dou8vec_minmax,
	.extra2 = &auto_flowlabels_max
	},
	{
	.procname = "fwmark_reflect",
	.data = &init_net.ipv6.sysctl.fwmark_reflect,
	.maxlen = sizeof(u8),
	.mode = 0644,
	.proc_handler = proc_dou8vec_minmax,
	},
	{
	.procname = "idgen_retries",
	.data = &init_net.ipv6.sysctl.idgen_retries,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = proc_dointvec,
	},
	{
	.procname = "idgen_delay",
	.data = &init_net.ipv6.sysctl.idgen_delay,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = proc_dointvec_jiffies,
	},
	{
	.procname = "flowlabel_state_ranges",
	.data = &init_net.ipv6.sysctl.flowlabel_state_ranges,
	.maxlen = sizeof(u8),
	.mode = 0644,
	.proc_handler = proc_dou8vec_minmax,
	},
	{
	.procname = "ip_nonlocal_bind",
	.data = &init_net.ipv6.sysctl.ip_nonlocal_bind,
	.maxlen = sizeof(u8),
	.mode = 0644,
	.proc_handler = proc_dou8vec_minmax,
	},
	{
	.procname = "flowlabel_reflect",
	.data = &init_net.ipv6.sysctl.flowlabel_reflect,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = proc_dointvec_minmax,
	.extra1 = SYSCTL_ZERO,
	.extra2 = &flowlabel_reflect_max,
	},
	{
	.procname = "max_dst_opts_number",
	.data = &init_net.ipv6.sysctl.max_dst_opts_cnt,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = proc_dointvec
	},
	{
	.procname = "max_hbh_opts_number",
	.data = &init_net.ipv6.sysctl.max_hbh_opts_cnt,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = proc_dointvec
	},
	{
	.procname = "max_dst_opts_length",
	.data = &init_net.ipv6.sysctl.max_dst_opts_len,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = proc_dointvec
	},
	{
	.procname = "max_hbh_length",
	.data = &init_net.ipv6.sysctl.max_hbh_opts_len,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = proc_dointvec
	},
	{
	.procname = "fib_multipath_hash_policy",
	.data = &init_net.ipv6.sysctl.multipath_hash_policy,
	.maxlen = sizeof(u8),
	.mode = 0644,
	.proc_handler = proc_rt6_multipath_hash_policy,
	.extra1 = SYSCTL_ZERO,
	.extra2 = &three,
	},
	{
	.procname = "fib_multipath_hash_fields",
	.data = &init_net.ipv6.sysctl.multipath_hash_fields,
	.maxlen = sizeof(u32),
	.mode = 0644,
	.proc_handler = proc_rt6_multipath_hash_fields,
	.extra1 = SYSCTL_ONE,
	.extra2 = &rt6_multipath_hash_fields_all_mask,
	},
	{
	.procname = "seg6_flowlabel",
	.data = &init_net.ipv6.sysctl.seg6_flowlabel,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = proc_dointvec
	},
	{
	.procname = "fib_notify_on_flag_change",
	.data = &init_net.ipv6.sysctl.fib_notify_on_flag_change,
	.maxlen = sizeof(u8),
	.mode = 0644,
	.proc_handler = proc_dou8vec_minmax,
	.extra1 = SYSCTL_ZERO,
	.extra2 = &two,
	},
	{
	.procname = "ioam6_id",
	.data = &init_net.ipv6.sysctl.ioam6_id,
	.maxlen = sizeof(u32),
	.mode = 0644,
	.proc_handler = proc_douintvec_minmax,
	.extra2 = &ioam6_id_max,
	},
	{
	.procname = "ioam6_id_wide",
	.data = &init_net.ipv6.sysctl.ioam6_id_wide,
	.maxlen = sizeof(u64),
	.mode = 0644,
	.proc_handler = proc_doulongvec_minmax,
	.extra2 = &ioam6_id_wide_max,
	},
	{ }
	};

	static struct ctl_table ipv6_rotable[] = {
	{
	.procname = "mld_max_msf",
	.data = &sysctl_mld_max_msf,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = proc_dointvec
	},
	{
	.procname = "mld_qrv",
	.data = &sysctl_mld_qrv,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = proc_dointvec_minmax,
	.extra1 = SYSCTL_ONE
	},
	#ifdef CONFIG_NETLABEL
	{
	.procname = "calipso_cache_enable",
	.data = &calipso_cache_enabled,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = proc_dointvec,
	},
	{
	.procname = "calipso_cache_bucket_size",
	.data = &calipso_cache_bucketsize,
	.maxlen = sizeof(int),
	.mode = 0644,
	.proc_handler = proc_dointvec,
	},
	#endif /* CONFIG_NETLABEL */
	{ }
	};

	static int __net_init ipv6_sysctl_net_init(struct net *net)
	{
	struct ctl_table *ipv6_table;
	struct ctl_table *ipv6_route_table;
	struct ctl_table *ipv6_icmp_table;
	int err, i;

	err = -ENOMEM;
	ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
	GFP_KERNEL);
	if (!ipv6_table)
	goto out;
	/* Update the variables to point into the current struct net */
	for (i = 0; i < ARRAY_SIZE(ipv6_table_template) - 1; i++)
	ipv6_table[i].data += (void )net - (void )&init_net;

	ipv6_route_table = ipv6_route_sysctl_init(net);
	if (!ipv6_route_table)
	goto out_ipv6_table;

	ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
	if (!ipv6_icmp_table)
	goto out_ipv6_route_table;

	net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
	if (!net->ipv6.sysctl.hdr)
	goto out_ipv6_icmp_table;

	net->ipv6.sysctl.route_hdr =
	register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
	if (!net->ipv6.sysctl.route_hdr)
	goto out_unregister_ipv6_table;

	net->ipv6.sysctl.icmp_hdr =
	register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
	if (!net->ipv6.sysctl.icmp_hdr)
	goto out_unregister_route_table;

	err = 0;
	out:
	return err;
	out_unregister_route_table:
	unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
	out_unregister_ipv6_table:
	unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
	out_ipv6_icmp_table:
	kfree(ipv6_icmp_table);
	out_ipv6_route_table:
	kfree(ipv6_route_table);
	out_ipv6_table:
	kfree(ipv6_table);
	goto out;
	}

	static void __net_exit ipv6_sysctl_net_exit(struct net *net)
	{
	struct ctl_table *ipv6_table;
	struct ctl_table *ipv6_route_table;
	struct ctl_table *ipv6_icmp_table;

	ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
	ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
	ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;

	unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
	unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
	unregister_net_sysctl_table(net->ipv6.sysctl.hdr);

	kfree(ipv6_table);
	kfree(ipv6_route_table);
	kfree(ipv6_icmp_table);
	}

	static struct pernet_operations ipv6_sysctl_net_ops = {
	.init = ipv6_sysctl_net_init,
	.exit = ipv6_sysctl_net_exit,
	};

	static struct ctl_table_header *ip6_header;

	int ipv6_sysctl_register(void)
	{
	int err = -ENOMEM;

	ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
	if (!ip6_header)
	goto out;

	err = register_pernet_subsys(&ipv6_sysctl_net_ops);
	if (err)
	goto err_pernet;
	out:
	return err;

	err_pernet:
	unregister_net_sysctl_table(ip6_header);
	goto out;
	}

	void ipv6_sysctl_unregister(void)
	{
	unregister_net_sysctl_table(ip6_header);
	unregister_pernet_subsys(&ipv6_sysctl_net_ops);
	}