-Add the struct net as param of nf_conntrack_l3proto_(un)register.
 register or unregister the l3proto only when the net is init_net.

-The new struct nf_ip_net is used to store the sysctl header and data
 of l3proto_ipv4,l4proto_tcp(6),l4proto_udp(6),l4proto_icmp(v6).
 because the protos such tcp and tcp6 use the same data,so making
 nf_ip_net as a field of netns_ct is the easiest way to manager it.

-nf_ct_l3proto_register_sysctl call init_net to initial the pernet data
 of l3proto.

-nf_ct_l3proto_net is used to get the pernet data of l3proto.

-export nf_conntrack_l3proto_(un)register

-use init_net as param of nf_conntrack_l3proto_(un)register.

Acked-by: Eric W. Biederman <redacted>
Signed-off-by: Gao feng <redacted>
---
 include/net/netfilter/nf_conntrack_l3proto.h   |    6 +-
 include/net/netns/conntrack.h                  |    8 ++
 net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c |    6 +-
 net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c |    6 +-
 net/netfilter/nf_conntrack_proto.c             |  127 +++++++++++++++---------
 5 files changed, 97 insertions(+), 56 deletions(-)

diff --git a/include/net/netfilter/nf_conntrack_l3proto.h b/include/net/netfilter/nf_conntrack_l3proto.h
index 9766005..d6df8c7 100644
--- a/include/net/netfilter/nf_conntrack_l3proto.h
+++ b/include/net/netfilter/nf_conntrack_l3proto.h

@@ -79,8 +79,10 @@ struct nf_conntrack_l3proto {
 extern struct nf_conntrack_l3proto __rcu *nf_ct_l3protos[AF_MAX];
 
 /* Protocol registration. */
-extern int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto);
-extern void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto);
+extern int nf_conntrack_l3proto_register(struct net *net,
+					 struct nf_conntrack_l3proto *proto);
+extern void nf_conntrack_l3proto_unregister(struct net *net,
+					    struct nf_conntrack_l3proto *proto);
 extern struct nf_conntrack_l3proto *nf_ct_l3proto_find_get(u_int16_t l3proto);
 extern void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p);
 

diff --git a/include/net/netns/conntrack.h b/include/net/netns/conntrack.h
index 1f53038..94992e9 100644
--- a/include/net/netns/conntrack.h
+++ b/include/net/netns/conntrack.h

@@ -20,6 +20,13 @@ struct nf_proto_net {
 	unsigned int		users;
 };
 
+struct nf_ip_net {
+#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
+	struct ctl_table_header *ctl_table_header;
+	struct ctl_table	*ctl_table;
+#endif
+};
+
 struct netns_ct {
 	atomic_t		count;
 	unsigned int		expect_count;

@@ -40,6 +47,7 @@ struct netns_ct {
 	unsigned int		sysctl_log_invalid; /* Log invalid packets */
 	int			sysctl_auto_assign_helper;
 	bool			auto_assign_helper_warned;
+	struct nf_ip_net	proto;

 #ifdef CONFIG_SYSCTL
 	struct ctl_table_header	*sysctl_header;
 	struct ctl_table_header	*acct_sysctl_header;

diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index 46ec515..0c0fb90 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c

@@ -409,7 +409,7 @@ static int __init nf_conntrack_l3proto_ipv4_init(void)
 		goto cleanup_udp;
 	}
 
-	ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv4);
+	ret = nf_conntrack_l3proto_register(&init_net, &nf_conntrack_l3proto_ipv4);
 	if (ret < 0) {
 		pr_err("nf_conntrack_ipv4: can't register ipv4\n");
 		goto cleanup_icmp;

@@ -432,7 +432,7 @@ static int __init nf_conntrack_l3proto_ipv4_init(void)
 	nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
 #endif
  cleanup_ipv4:
-	nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
+	nf_conntrack_l3proto_unregister(&init_net, &nf_conntrack_l3proto_ipv4);
  cleanup_icmp:
 	nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_icmp);
  cleanup_udp:

@@ -451,7 +451,7 @@ static void __exit nf_conntrack_l3proto_ipv4_fini(void)
 	nf_conntrack_ipv4_compat_fini();
 #endif
 	nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
-	nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
+	nf_conntrack_l3proto_unregister(&init_net, &nf_conntrack_l3proto_ipv4);
 	nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_icmp);
 	nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_udp4);
 	nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_tcp4);

diff --git a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
index 55f379f..6cfbe7b 100644
--- a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c

@@ -359,7 +359,7 @@ static int __init nf_conntrack_l3proto_ipv6_init(void)
 		goto cleanup_udp;
 	}
 
-	ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv6);
+	ret = nf_conntrack_l3proto_register(&init_net, &nf_conntrack_l3proto_ipv6);
 	if (ret < 0) {
 		pr_err("nf_conntrack_ipv6: can't register ipv6\n");
 		goto cleanup_icmpv6;

@@ -375,7 +375,7 @@ static int __init nf_conntrack_l3proto_ipv6_init(void)
 	return ret;
 
  cleanup_ipv6:
-	nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv6);
+	nf_conntrack_l3proto_unregister(&init_net, &nf_conntrack_l3proto_ipv6);
  cleanup_icmpv6:
 	nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_icmpv6);
  cleanup_udp:

@@ -389,7 +389,7 @@ static void __exit nf_conntrack_l3proto_ipv6_fini(void)
 {
 	synchronize_net();
 	nf_unregister_hooks(ipv6_conntrack_ops, ARRAY_SIZE(ipv6_conntrack_ops));
-	nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv6);
+	nf_conntrack_l3proto_unregister(&init_net, &nf_conntrack_l3proto_ipv6);
 	nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_icmpv6);
 	nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_udp6);
 	nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_tcp6);

diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index 6d68727..7ee6653 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c

@@ -170,85 +170,116 @@ static int kill_l4proto(struct nf_conn *i, void *data)
 	       nf_ct_l3num(i) == l4proto->l3proto;
 }
 
-static int nf_ct_l3proto_register_sysctl(struct nf_conntrack_l3proto *l3proto)
+static struct nf_ip_net *nf_ct_l3proto_net(struct net *net,
+					   struct nf_conntrack_l3proto *l3proto)
+{
+	if (l3proto->l3proto == PF_INET)
+		return &net->ct.proto;
+	else
+		return NULL;
+}
+
+static int nf_ct_l3proto_register_sysctl(struct net *net,
+					 struct nf_conntrack_l3proto *l3proto)
 {
 	int err = 0;
+	struct nf_ip_net *in = nf_ct_l3proto_net(net, l3proto);
 
-#ifdef CONFIG_SYSCTL
-	if (l3proto->ctl_table != NULL) {
-		err = nf_ct_register_sysctl(&init_net,
-					    &l3proto->ctl_table_header,
+	if (in == NULL)
+		return 0;