v4.19.13 snapshot.
diff --git a/include/net/netns/conntrack.h b/include/net/netns/conntrack.h
new file mode 100644
index 0000000..9795d628
--- /dev/null
+++ b/include/net/netns/conntrack.h
@@ -0,0 +1,124 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NETNS_CONNTRACK_H
+#define __NETNS_CONNTRACK_H
+
+#include <linux/list.h>
+#include <linux/list_nulls.h>
+#include <linux/atomic.h>
+#include <linux/workqueue.h>
+#include <linux/netfilter/nf_conntrack_tcp.h>
+#ifdef CONFIG_NF_CT_PROTO_DCCP
+#include <linux/netfilter/nf_conntrack_dccp.h>
+#endif
+#ifdef CONFIG_NF_CT_PROTO_SCTP
+#include <linux/netfilter/nf_conntrack_sctp.h>
+#endif
+#include <linux/seqlock.h>
+
+struct ctl_table_header;
+struct nf_conntrack_ecache;
+
+struct nf_proto_net {
+#ifdef CONFIG_SYSCTL
+ struct ctl_table_header *ctl_table_header;
+ struct ctl_table *ctl_table;
+#endif
+ unsigned int users;
+};
+
+struct nf_generic_net {
+ struct nf_proto_net pn;
+ unsigned int timeout;
+};
+
+struct nf_tcp_net {
+ struct nf_proto_net pn;
+ unsigned int timeouts[TCP_CONNTRACK_TIMEOUT_MAX];
+ unsigned int tcp_loose;
+ unsigned int tcp_be_liberal;
+ unsigned int tcp_max_retrans;
+};
+
+enum udp_conntrack {
+ UDP_CT_UNREPLIED,
+ UDP_CT_REPLIED,
+ UDP_CT_MAX
+};
+
+struct nf_udp_net {
+ struct nf_proto_net pn;
+ unsigned int timeouts[UDP_CT_MAX];
+};
+
+struct nf_icmp_net {
+ struct nf_proto_net pn;
+ unsigned int timeout;
+};
+
+#ifdef CONFIG_NF_CT_PROTO_DCCP
+struct nf_dccp_net {
+ struct nf_proto_net pn;
+ int dccp_loose;
+ unsigned int dccp_timeout[CT_DCCP_MAX + 1];
+};
+#endif
+
+#ifdef CONFIG_NF_CT_PROTO_SCTP
+struct nf_sctp_net {
+ struct nf_proto_net pn;
+ unsigned int timeouts[SCTP_CONNTRACK_MAX];
+};
+#endif
+
+struct nf_ip_net {
+ struct nf_generic_net generic;
+ struct nf_tcp_net tcp;
+ struct nf_udp_net udp;
+ struct nf_icmp_net icmp;
+ struct nf_icmp_net icmpv6;
+#ifdef CONFIG_NF_CT_PROTO_DCCP
+ struct nf_dccp_net dccp;
+#endif
+#ifdef CONFIG_NF_CT_PROTO_SCTP
+ struct nf_sctp_net sctp;
+#endif
+};
+
+struct ct_pcpu {
+ spinlock_t lock;
+ struct hlist_nulls_head unconfirmed;
+ struct hlist_nulls_head dying;
+};
+
+struct netns_ct {
+ atomic_t count;
+ unsigned int expect_count;
+#ifdef CONFIG_NF_CONNTRACK_EVENTS
+ struct delayed_work ecache_dwork;
+ bool ecache_dwork_pending;
+#endif
+#ifdef CONFIG_SYSCTL
+ struct ctl_table_header *sysctl_header;
+ struct ctl_table_header *acct_sysctl_header;
+ struct ctl_table_header *tstamp_sysctl_header;
+ struct ctl_table_header *event_sysctl_header;
+ struct ctl_table_header *helper_sysctl_header;
+#endif
+ unsigned int sysctl_log_invalid; /* Log invalid packets */
+ int sysctl_events;
+ int sysctl_acct;
+ int sysctl_auto_assign_helper;
+ bool auto_assign_helper_warned;
+ int sysctl_tstamp;
+ int sysctl_checksum;
+
+ struct ct_pcpu __percpu *pcpu_lists;
+ struct ip_conntrack_stat __percpu *stat;
+ struct nf_ct_event_notifier __rcu *nf_conntrack_event_cb;
+ struct nf_exp_event_notifier __rcu *nf_expect_event_cb;
+ struct nf_ip_net nf_ct_proto;
+#if defined(CONFIG_NF_CONNTRACK_LABELS)
+ unsigned int labels_used;
+#endif
+};
+#endif