Initial commit: Linux kernel 4.19 for Unplugged OS

include/net/netfilter/br_netfilter.h

@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BR_NETFILTER_H_
+#define _BR_NETFILTER_H_
+
+#include "../../../net/bridge/br_private.h"
+
+static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
+{
+	skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC);
+
+	if (likely(skb->nf_bridge))
+		refcount_set(&(skb->nf_bridge->use), 1);
+
+	return skb->nf_bridge;
+}
+
+void nf_bridge_update_protocol(struct sk_buff *skb);
+
+int br_nf_hook_thresh(unsigned int hook, struct net *net, struct sock *sk,
+		      struct sk_buff *skb, struct net_device *indev,
+		      struct net_device *outdev,
+		      int (*okfn)(struct net *, struct sock *,
+				  struct sk_buff *));
+
+static inline struct nf_bridge_info *
+nf_bridge_info_get(const struct sk_buff *skb)
+{
+	return skb->nf_bridge;
+}
+
+unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb);
+
+static inline void nf_bridge_push_encap_header(struct sk_buff *skb)
+{
+	unsigned int len = nf_bridge_encap_header_len(skb);
+
+	skb_push(skb, len);
+	skb->network_header -= len;
+}
+
+int br_nf_pre_routing_finish_bridge(struct net *net, struct sock *sk, struct sk_buff *skb);
+
+static inline struct rtable *bridge_parent_rtable(const struct net_device *dev)
+{
+	struct net_bridge_port *port;
+
+	port = br_port_get_rcu(dev);
+	return port ? &port->br->fake_rtable : NULL;
+}
+
+struct net_device *setup_pre_routing(struct sk_buff *skb);
+
+#if IS_ENABLED(CONFIG_IPV6)
+int br_validate_ipv6(struct net *net, struct sk_buff *skb);
+unsigned int br_nf_pre_routing_ipv6(void *priv,
+				    struct sk_buff *skb,
+				    const struct nf_hook_state *state);
+#else
+static inline int br_validate_ipv6(struct net *net, struct sk_buff *skb)
+{
+	return -1;
+}
+
+static inline unsigned int
+br_nf_pre_routing_ipv6(const struct nf_hook_ops *ops, struct sk_buff *skb,
+		       const struct nf_hook_state *state)
+{
+	return NF_ACCEPT;
+}
+#endif
+
+#endif /* _BR_NETFILTER_H_ */

include/net/netfilter/ipv4/nf_conntrack_ipv4.h

@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * IPv4 support for nf_conntrack.
+ *
+ * 23 Mar 2004: Yasuyuki Kozakai @ USAGI <yasuyuki.kozakai@toshiba.co.jp>
+ *	- move L3 protocol dependent part from include/linux/netfilter_ipv4/
+ *	  ip_conntarck.h
+ */
+
+#ifndef _NF_CONNTRACK_IPV4_H
+#define _NF_CONNTRACK_IPV4_H
+
+extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4;
+extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4;
+extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp;
+#ifdef CONFIG_NF_CT_PROTO_DCCP
+extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_dccp4;
+#endif
+#ifdef CONFIG_NF_CT_PROTO_SCTP
+extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4;
+#endif
+#ifdef CONFIG_NF_CT_PROTO_UDPLITE
+extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4;
+#endif
+
+int nf_conntrack_ipv4_compat_init(void);
+void nf_conntrack_ipv4_compat_fini(void);
+
+#endif /*_NF_CONNTRACK_IPV4_H*/

include/net/netfilter/ipv4/nf_defrag_ipv4.h

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_DEFRAG_IPV4_H
+#define _NF_DEFRAG_IPV4_H
+
+struct net;
+int nf_defrag_ipv4_enable(struct net *);
+
+#endif /* _NF_DEFRAG_IPV4_H */

include/net/netfilter/ipv4/nf_dup_ipv4.h

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_DUP_IPV4_H_
+#define _NF_DUP_IPV4_H_
+
+void nf_dup_ipv4(struct net *net, struct sk_buff *skb, unsigned int hooknum,
+		 const struct in_addr *gw, int oif);
+
+#endif /* _NF_DUP_IPV4_H_ */

include/net/netfilter/ipv4/nf_nat_masquerade.h

@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_NAT_MASQUERADE_IPV4_H_
+#define _NF_NAT_MASQUERADE_IPV4_H_
+
+#include <net/netfilter/nf_nat.h>
+
+unsigned int
+nf_nat_masquerade_ipv4(struct sk_buff *skb, unsigned int hooknum,
+		       const struct nf_nat_range2 *range,
+		       const struct net_device *out);
+
+int nf_nat_masquerade_ipv4_register_notifier(void);
+void nf_nat_masquerade_ipv4_unregister_notifier(void);
+
+#endif /*_NF_NAT_MASQUERADE_IPV4_H_ */

include/net/netfilter/ipv4/nf_reject.h

@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _IPV4_NF_REJECT_H
+#define _IPV4_NF_REJECT_H
+
+#include <linux/skbuff.h>
+#include <net/ip.h>
+#include <net/icmp.h>
+
+void nf_send_unreach(struct sk_buff *skb_in, int code, int hook);
+void nf_send_reset(struct net *net, struct sk_buff *oldskb, int hook);
+
+const struct tcphdr *nf_reject_ip_tcphdr_get(struct sk_buff *oldskb,
+					     struct tcphdr *_oth, int hook);
+struct iphdr *nf_reject_iphdr_put(struct sk_buff *nskb,
+				  const struct sk_buff *oldskb,
+				  __u8 protocol, int ttl);
+void nf_reject_ip_tcphdr_put(struct sk_buff *nskb, const struct sk_buff *oldskb,
+			     const struct tcphdr *oth);
+
+#endif /* _IPV4_NF_REJECT_H */

include/net/netfilter/ipv6/nf_conntrack_icmpv6.h

@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ICMPv6 tracking.
+ *
+ * 21 Apl 2004: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
+ *	- separated from nf_conntrack_icmp.h
+ *
+ * Derived from include/linux/netfiter_ipv4/ip_conntrack_icmp.h
+ */
+
+#ifndef _NF_CONNTRACK_ICMPV6_H
+#define _NF_CONNTRACK_ICMPV6_H
+
+#ifndef ICMPV6_NI_QUERY
+#define ICMPV6_NI_QUERY 139
+#endif
+#ifndef ICMPV6_NI_REPLY
+#define ICMPV6_NI_REPLY 140
+#endif
+
+#endif /* _NF_CONNTRACK_ICMPV6_H */

include/net/netfilter/ipv6/nf_conntrack_ipv6.h

@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_CONNTRACK_IPV6_H
+#define _NF_CONNTRACK_IPV6_H
+
+extern const struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6;
+
+extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6;
+extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6;
+extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6;
+#ifdef CONFIG_NF_CT_PROTO_DCCP
+extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_dccp6;
+#endif
+#ifdef CONFIG_NF_CT_PROTO_SCTP
+extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6;
+#endif
+#ifdef CONFIG_NF_CT_PROTO_UDPLITE
+extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6;
+#endif
+
+#include <linux/sysctl.h>
+extern struct ctl_table nf_ct_ipv6_sysctl_table[];
+
+#endif /* _NF_CONNTRACK_IPV6_H*/

include/net/netfilter/ipv6/nf_defrag_ipv6.h

@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_DEFRAG_IPV6_H
+#define _NF_DEFRAG_IPV6_H
+
+struct net;
+int nf_defrag_ipv6_enable(struct net *);
+
+int nf_ct_frag6_init(void);
+void nf_ct_frag6_cleanup(void);
+int nf_ct_frag6_gather(struct net *net, struct sk_buff *skb, u32 user);
+
+struct inet_frags_ctl;
+
+#endif /* _NF_DEFRAG_IPV6_H */

include/net/netfilter/ipv6/nf_dup_ipv6.h

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_DUP_IPV6_H_
+#define _NF_DUP_IPV6_H_
+
+void nf_dup_ipv6(struct net *net, struct sk_buff *skb, unsigned int hooknum,
+		 const struct in6_addr *gw, int oif);
+
+#endif /* _NF_DUP_IPV6_H_ */

include/net/netfilter/ipv6/nf_nat_masquerade.h

@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_NAT_MASQUERADE_IPV6_H_
+#define _NF_NAT_MASQUERADE_IPV6_H_
+
+unsigned int
+nf_nat_masquerade_ipv6(struct sk_buff *skb, const struct nf_nat_range2 *range,
+		       const struct net_device *out);
+int nf_nat_masquerade_ipv6_register_notifier(void);
+void nf_nat_masquerade_ipv6_unregister_notifier(void);
+
+#endif /* _NF_NAT_MASQUERADE_IPV6_H_ */

include/net/netfilter/ipv6/nf_reject.h

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _IPV6_NF_REJECT_H
+#define _IPV6_NF_REJECT_H
+
+#include <linux/icmpv6.h>
+
+void nf_send_unreach6(struct net *net, struct sk_buff *skb_in, unsigned char code,
+		      unsigned int hooknum);
+
+void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook);
+
+const struct tcphdr *nf_reject_ip6_tcphdr_get(struct sk_buff *oldskb,
+					      struct tcphdr *otcph,
+					      unsigned int *otcplen, int hook);
+struct ipv6hdr *nf_reject_ip6hdr_put(struct sk_buff *nskb,
+				     const struct sk_buff *oldskb,
+				     __u8 protocol, int hoplimit);
+void nf_reject_ip6_tcphdr_put(struct sk_buff *nskb,
+			      const struct sk_buff *oldskb,
+			      const struct tcphdr *oth, unsigned int otcplen);
+
+#endif /* _IPV6_NF_REJECT_H */

include/net/netfilter/nf_conntrack.h

@@ -0,0 +1,331 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Connection state tracking for netfilter.  This is separated from,
+ * but required by, the (future) NAT layer; it can also be used by an iptables
+ * extension.
+ *
+ * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
+ *	- generalize L3 protocol dependent part.
+ *
+ * Derived from include/linux/netfiter_ipv4/ip_conntrack.h
+ */
+
+#ifndef _NF_CONNTRACK_H
+#define _NF_CONNTRACK_H
+
+#include <linux/netfilter/nf_conntrack_common.h>
+
+#include <linux/bitops.h>
+#include <linux/compiler.h>
+#include <linux/atomic.h>
+
+#include <linux/netfilter/nf_conntrack_tcp.h>
+#include <linux/netfilter/nf_conntrack_dccp.h>
+#include <linux/netfilter/nf_conntrack_sctp.h>
+#include <linux/netfilter/nf_conntrack_proto_gre.h>
+#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
+
+#include <net/netfilter/nf_conntrack_tuple.h>
+
+/* per conntrack: protocol private data */
+union nf_conntrack_proto {
+	/* insert conntrack proto private data here */
+	struct nf_ct_dccp dccp;
+	struct ip_ct_sctp sctp;
+	struct ip_ct_tcp tcp;
+	struct nf_ct_gre gre;
+	unsigned int tmpl_padto;
+};
+
+union nf_conntrack_expect_proto {
+	/* insert expect proto private data here */
+};
+
+struct nf_conntrack_net {
+	unsigned int users4;
+	unsigned int users6;
+};
+
+#include <linux/types.h>
+#include <linux/skbuff.h>
+
+#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
+#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
+
+struct nf_conn {
+	/* Usage count in here is 1 for hash table, 1 per skb,
+	 * plus 1 for any connection(s) we are `master' for
+	 *
+	 * Hint, SKB address this struct and refcnt via skb->_nfct and
+	 * helpers nf_conntrack_get() and nf_conntrack_put().
+	 * Helper nf_ct_put() equals nf_conntrack_put() by dec refcnt,
+	 * beware nf_ct_get() is different and don't inc refcnt.
+	 */
+	struct nf_conntrack ct_general;
+
+	spinlock_t	lock;
+	u16		cpu;
+
+#ifdef CONFIG_NF_CONNTRACK_ZONES
+	struct nf_conntrack_zone zone;
+#endif
+	/* XXX should I move this to the tail ? - Y.K */
+	/* These are my tuples; original and reply */
+	struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
+
+	/* Have we seen traffic both ways yet? (bitset) */
+	unsigned long status;
+
+	/* jiffies32 when this ct is considered dead */
+	u32 timeout;
+
+	possible_net_t ct_net;
+
+#if IS_ENABLED(CONFIG_NF_NAT)
+	struct hlist_node	nat_bysource;
+#endif
+	/* all members below initialized via memset */
+	struct { } __nfct_init_offset;
+
+	/* If we were expected by an expectation, this will be it */
+	struct nf_conn *master;
+
+#if defined(CONFIG_NF_CONNTRACK_MARK)
+	u_int32_t mark;
+#endif
+
+#ifdef CONFIG_NF_CONNTRACK_SECMARK
+	u_int32_t secmark;
+#endif
+
+	/* Extensions */
+	struct nf_ct_ext *ext;
+
+	/* Storage reserved for other modules, must be the last member */
+	union nf_conntrack_proto proto;
+};
+
+static inline struct nf_conn *
+nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
+{
+	return container_of(hash, struct nf_conn,
+			    tuplehash[hash->tuple.dst.dir]);
+}
+
+static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct)
+{
+	return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
+}
+
+static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct)
+{
+	return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
+}
+
+#define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
+
+/* get master conntrack via master expectation */
+#define master_ct(conntr) (conntr->master)
+
+extern struct net init_net;
+
+static inline struct net *nf_ct_net(const struct nf_conn *ct)
+{
+	return read_pnet(&ct->ct_net);
+}
+
+/* Alter reply tuple (maybe alter helper). */
+void nf_conntrack_alter_reply(struct nf_conn *ct,
+			      const struct nf_conntrack_tuple *newreply);
+
+/* Is this tuple taken? (ignoring any belonging to the given
+   conntrack). */
+int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
+			     const struct nf_conn *ignored_conntrack);
+
+#define NFCT_INFOMASK	7UL
+#define NFCT_PTRMASK	~(NFCT_INFOMASK)
+
+/* Return conntrack_info and tuple hash for given skb. */
+static inline struct nf_conn *
+nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
+{
+	*ctinfo = skb->_nfct & NFCT_INFOMASK;
+
+	return (struct nf_conn *)(skb->_nfct & NFCT_PTRMASK);
+}
+
+/* decrement reference count on a conntrack */
+static inline void nf_ct_put(struct nf_conn *ct)
+{
+	WARN_ON(!ct);
+	nf_conntrack_put(&ct->ct_general);
+}
+
+/* Protocol module loading */
+int nf_ct_l3proto_try_module_get(unsigned short l3proto);
+void nf_ct_l3proto_module_put(unsigned short l3proto);
+
+/* load module; enable/disable conntrack in this namespace */
+int nf_ct_netns_get(struct net *net, u8 nfproto);
+void nf_ct_netns_put(struct net *net, u8 nfproto);
+
+/*
+ * Allocate a hashtable of hlist_head (if nulls == 0),
+ * or hlist_nulls_head (if nulls == 1)
+ */
+void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls);
+
+int nf_conntrack_hash_check_insert(struct nf_conn *ct);
+bool nf_ct_delete(struct nf_conn *ct, u32 pid, int report);
+
+bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff,
+		       u_int16_t l3num, struct net *net,
+		       struct nf_conntrack_tuple *tuple);
+bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
+			  const struct nf_conntrack_tuple *orig);
+
+void __nf_ct_refresh_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+			  const struct sk_buff *skb,
+			  unsigned long extra_jiffies, int do_acct);
+
+/* Refresh conntrack for this many jiffies and do accounting */
+static inline void nf_ct_refresh_acct(struct nf_conn *ct,
+				      enum ip_conntrack_info ctinfo,
+				      const struct sk_buff *skb,
+				      unsigned long extra_jiffies)
+{
+	__nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
+}
+
+/* Refresh conntrack for this many jiffies */
+static inline void nf_ct_refresh(struct nf_conn *ct,
+				 const struct sk_buff *skb,
+				 unsigned long extra_jiffies)
+{
+	__nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
+}
+
+/* kill conntrack and do accounting */
+bool nf_ct_kill_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+		     const struct sk_buff *skb);
+
+/* kill conntrack without accounting */
+static inline bool nf_ct_kill(struct nf_conn *ct)
+{
+	return nf_ct_delete(ct, 0, 0);
+}
+
+/* Set all unconfirmed conntrack as dying */
+void nf_ct_unconfirmed_destroy(struct net *);
+
+/* Iterate over all conntracks: if iter returns true, it's deleted. */
+void nf_ct_iterate_cleanup_net(struct net *net,
+			       int (*iter)(struct nf_conn *i, void *data),
+			       void *data, u32 portid, int report);
+
+/* also set unconfirmed conntracks as dying. Only use in module exit path. */
+void nf_ct_iterate_destroy(int (*iter)(struct nf_conn *i, void *data),
+			   void *data);
+
+struct nf_conntrack_zone;
+
+void nf_conntrack_free(struct nf_conn *ct);
+struct nf_conn *nf_conntrack_alloc(struct net *net,
+				   const struct nf_conntrack_zone *zone,
+				   const struct nf_conntrack_tuple *orig,
+				   const struct nf_conntrack_tuple *repl,
+				   gfp_t gfp);
+
+static inline int nf_ct_is_template(const struct nf_conn *ct)
+{
+	return test_bit(IPS_TEMPLATE_BIT, &ct->status);
+}
+
+/* It's confirmed if it is, or has been in the hash table. */
+static inline int nf_ct_is_confirmed(const struct nf_conn *ct)
+{
+	return test_bit(IPS_CONFIRMED_BIT, &ct->status);
+}
+
+static inline int nf_ct_is_dying(const struct nf_conn *ct)
+{
+	return test_bit(IPS_DYING_BIT, &ct->status);
+}
+
+/* Packet is received from loopback */
+static inline bool nf_is_loopback_packet(const struct sk_buff *skb)
+{
+	return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK;
+}
+
+#define nfct_time_stamp ((u32)(jiffies))
+
+/* jiffies until ct expires, 0 if already expired */
+static inline unsigned long nf_ct_expires(const struct nf_conn *ct)
+{
+	s32 timeout = ct->timeout - nfct_time_stamp;
+
+	return timeout > 0 ? timeout : 0;
+}
+
+static inline bool nf_ct_is_expired(const struct nf_conn *ct)
+{
+	return (__s32)(ct->timeout - nfct_time_stamp) <= 0;
+}
+
+/* use after obtaining a reference count */
+static inline bool nf_ct_should_gc(const struct nf_conn *ct)
+{
+	return nf_ct_is_expired(ct) && nf_ct_is_confirmed(ct) &&
+	       !nf_ct_is_dying(ct);
+}
+
+struct kernel_param;
+
+int nf_conntrack_set_hashsize(const char *val, const struct kernel_param *kp);
+int nf_conntrack_hash_resize(unsigned int hashsize);
+
+extern struct hlist_nulls_head *nf_conntrack_hash;
+extern unsigned int nf_conntrack_htable_size;
+extern seqcount_t nf_conntrack_generation;
+extern unsigned int nf_conntrack_max;
+
+/* must be called with rcu read lock held */
+static inline void
+nf_conntrack_get_ht(struct hlist_nulls_head **hash, unsigned int *hsize)
+{
+	struct hlist_nulls_head *hptr;
+	unsigned int sequence, hsz;
+
+	do {
+		sequence = read_seqcount_begin(&nf_conntrack_generation);
+		hsz = nf_conntrack_htable_size;
+		hptr = nf_conntrack_hash;
+	} while (read_seqcount_retry(&nf_conntrack_generation, sequence));
+
+	*hash = hptr;
+	*hsize = hsz;
+}
+
+struct nf_conn *nf_ct_tmpl_alloc(struct net *net,
+				 const struct nf_conntrack_zone *zone,
+				 gfp_t flags);
+void nf_ct_tmpl_free(struct nf_conn *tmpl);
+
+u32 nf_ct_get_id(const struct nf_conn *ct);
+
+static inline void
+nf_ct_set(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info info)
+{
+	skb->_nfct = (unsigned long)ct | info;
+}
+
+#define NF_CT_STAT_INC(net, count)	  __this_cpu_inc((net)->ct.stat->count)
+#define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count)
+#define NF_CT_STAT_ADD_ATOMIC(net, count, v) this_cpu_add((net)->ct.stat->count, (v))
+
+#define MODULE_ALIAS_NFCT_HELPER(helper) \
+        MODULE_ALIAS("nfct-helper-" helper)
+
+#endif /* _NF_CONNTRACK_H */

include/net/netfilter/nf_conntrack_acct.h

@@ -0,0 +1,69 @@
+/*
+ * (C) 2008 Krzysztof Piotr Oledzki <ole@ans.pl>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _NF_CONNTRACK_ACCT_H
+#define _NF_CONNTRACK_ACCT_H
+#include <net/net_namespace.h>
+#include <linux/netfilter/nf_conntrack_common.h>
+#include <linux/netfilter/nf_conntrack_tuple_common.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_extend.h>
+
+struct nf_conn_counter {
+	atomic64_t packets;
+	atomic64_t bytes;
+};
+
+struct nf_conn_acct {
+	struct nf_conn_counter counter[IP_CT_DIR_MAX];
+};
+
+static inline
+struct nf_conn_acct *nf_conn_acct_find(const struct nf_conn *ct)
+{
+	return nf_ct_ext_find(ct, NF_CT_EXT_ACCT);
+}
+
+static inline
+struct nf_conn_acct *nf_ct_acct_ext_add(struct nf_conn *ct, gfp_t gfp)
+{
+	struct net *net = nf_ct_net(ct);
+	struct nf_conn_acct *acct;
+
+	if (!net->ct.sysctl_acct)
+		return NULL;
+
+	acct = nf_ct_ext_add(ct, NF_CT_EXT_ACCT, gfp);
+	if (!acct)
+		pr_debug("failed to add accounting extension area");
+
+
+	return acct;
+};
+
+unsigned int seq_print_acct(struct seq_file *s, const struct nf_conn *ct,
+			    int dir);
+
+/* Check if connection tracking accounting is enabled */
+static inline bool nf_ct_acct_enabled(struct net *net)
+{
+	return net->ct.sysctl_acct != 0;
+}
+
+/* Enable/disable connection tracking accounting */
+static inline void nf_ct_set_acct(struct net *net, bool enable)
+{
+	net->ct.sysctl_acct = enable;
+}
+
+int nf_conntrack_acct_pernet_init(struct net *net);
+void nf_conntrack_acct_pernet_fini(struct net *net);
+
+int nf_conntrack_acct_init(void);
+void nf_conntrack_acct_fini(void);
+#endif /* _NF_CONNTRACK_ACCT_H */

include/net/netfilter/nf_conntrack_core.h

@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This header is used to share core functionality between the
+ * standalone connection tracking module, and the compatibility layer's use
+ * of connection tracking.
+ *
+ * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
+ *	- generalize L3 protocol dependent part.
+ *
+ * Derived from include/linux/netfiter_ipv4/ip_conntrack_core.h
+ */
+
+#ifndef _NF_CONNTRACK_CORE_H
+#define _NF_CONNTRACK_CORE_H
+
+#include <linux/netfilter.h>
+#include <net/netfilter/nf_conntrack_l4proto.h>
+#include <net/netfilter/nf_conntrack_ecache.h>
+
+/* This header is used to share core functionality between the
+   standalone connection tracking module, and the compatibility layer's use
+   of connection tracking. */
+unsigned int nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
+			     struct sk_buff *skb);
+
+int nf_conntrack_init_net(struct net *net);
+void nf_conntrack_cleanup_net(struct net *net);
+void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list);
+
+int nf_conntrack_proto_pernet_init(struct net *net);
+void nf_conntrack_proto_pernet_fini(struct net *net);
+
+int nf_conntrack_proto_init(void);
+void nf_conntrack_proto_fini(void);
+
+int nf_conntrack_init_start(void);
+void nf_conntrack_cleanup_start(void);
+
+void nf_conntrack_init_end(void);
+void nf_conntrack_cleanup_end(void);
+
+bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
+			const struct nf_conntrack_tuple *orig,
+			const struct nf_conntrack_l4proto *l4proto);
+
+/* Find a connection corresponding to a tuple. */
+struct nf_conntrack_tuple_hash *
+nf_conntrack_find_get(struct net *net,
+		      const struct nf_conntrack_zone *zone,
+		      const struct nf_conntrack_tuple *tuple);
+
+int __nf_conntrack_confirm(struct sk_buff *skb);
+
+/* Confirm a connection: returns NF_DROP if packet must be dropped. */
+static inline int nf_conntrack_confirm(struct sk_buff *skb)
+{
+	struct nf_conn *ct = (struct nf_conn *)skb_nfct(skb);
+	int ret = NF_ACCEPT;
+
+	if (ct) {
+		if (!nf_ct_is_confirmed(ct))
+			ret = __nf_conntrack_confirm(skb);
+		if (likely(ret == NF_ACCEPT))
+			nf_ct_deliver_cached_events(ct);
+	}
+	return ret;
+}
+
+void print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
+		 const struct nf_conntrack_l4proto *proto);
+
+#define CONNTRACK_LOCKS 1024
+
+extern spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];
+void nf_conntrack_lock(spinlock_t *lock);
+
+extern spinlock_t nf_conntrack_expect_lock;
+
+#endif /* _NF_CONNTRACK_CORE_H */

include/net/netfilter/nf_conntrack_count.h

@@ -0,0 +1,36 @@
+#ifndef _NF_CONNTRACK_COUNT_H
+#define _NF_CONNTRACK_COUNT_H
+
+#include <linux/list.h>
+
+struct nf_conncount_data;
+
+struct nf_conncount_list {
+	spinlock_t list_lock;
+	struct list_head head;	/* connections with the same filtering key */
+	unsigned int count;	/* length of list */
+};
+
+struct nf_conncount_data *nf_conncount_init(struct net *net, unsigned int family,
+					    unsigned int keylen);
+void nf_conncount_destroy(struct net *net, unsigned int family,
+			  struct nf_conncount_data *data);
+
+unsigned int nf_conncount_count(struct net *net,
+				struct nf_conncount_data *data,
+				const u32 *key,
+				const struct nf_conntrack_tuple *tuple,
+				const struct nf_conntrack_zone *zone);
+
+int nf_conncount_add(struct net *net, struct nf_conncount_list *list,
+		     const struct nf_conntrack_tuple *tuple,
+		     const struct nf_conntrack_zone *zone);
+
+void nf_conncount_list_init(struct nf_conncount_list *list);
+
+bool nf_conncount_gc_list(struct net *net,
+			  struct nf_conncount_list *list);
+
+void nf_conncount_cache_free(struct nf_conncount_list *list);
+
+#endif

include/net/netfilter/nf_conntrack_ecache.h

@@ -0,0 +1,213 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * connection tracking event cache.
+ */
+
+#ifndef _NF_CONNTRACK_ECACHE_H
+#define _NF_CONNTRACK_ECACHE_H
+#include <net/netfilter/nf_conntrack.h>
+
+#include <net/net_namespace.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <linux/netfilter/nf_conntrack_common.h>
+#include <linux/netfilter/nf_conntrack_tuple_common.h>
+#include <net/netfilter/nf_conntrack_extend.h>
+
+enum nf_ct_ecache_state {
+	NFCT_ECACHE_UNKNOWN,		/* destroy event not sent */
+	NFCT_ECACHE_DESTROY_FAIL,	/* tried but failed to send destroy event */
+	NFCT_ECACHE_DESTROY_SENT,	/* sent destroy event after failure */
+};
+
+struct nf_conntrack_ecache {
+	unsigned long cache;		/* bitops want long */
+	u16 missed;			/* missed events */
+	u16 ctmask;			/* bitmask of ct events to be delivered */
+	u16 expmask;			/* bitmask of expect events to be delivered */
+	enum nf_ct_ecache_state state:8;/* ecache state */
+	u32 portid;			/* netlink portid of destroyer */
+};
+
+static inline struct nf_conntrack_ecache *
+nf_ct_ecache_find(const struct nf_conn *ct)
+{
+#ifdef CONFIG_NF_CONNTRACK_EVENTS
+	return nf_ct_ext_find(ct, NF_CT_EXT_ECACHE);
+#else
+	return NULL;
+#endif
+}
+
+static inline struct nf_conntrack_ecache *
+nf_ct_ecache_ext_add(struct nf_conn *ct, u16 ctmask, u16 expmask, gfp_t gfp)
+{
+#ifdef CONFIG_NF_CONNTRACK_EVENTS
+	struct net *net = nf_ct_net(ct);
+	struct nf_conntrack_ecache *e;
+
+	if (!ctmask && !expmask && net->ct.sysctl_events) {
+		ctmask = ~0;
+		expmask = ~0;
+	}
+	if (!ctmask && !expmask)
+		return NULL;
+
+	e = nf_ct_ext_add(ct, NF_CT_EXT_ECACHE, gfp);
+	if (e) {
+		e->ctmask  = ctmask;
+		e->expmask = expmask;
+	}
+	return e;
+#else
+	return NULL;
+#endif
+};
+
+#ifdef CONFIG_NF_CONNTRACK_EVENTS
+/* This structure is passed to event handler */
+struct nf_ct_event {
+	struct nf_conn *ct;
+	u32 portid;
+	int report;
+};
+
+struct nf_ct_event_notifier {
+	int (*fcn)(unsigned int events, struct nf_ct_event *item);
+};
+
+int nf_conntrack_register_notifier(struct net *net,
+				   struct nf_ct_event_notifier *nb);
+void nf_conntrack_unregister_notifier(struct net *net,
+				      struct nf_ct_event_notifier *nb);
+
+void nf_ct_deliver_cached_events(struct nf_conn *ct);
+int nf_conntrack_eventmask_report(unsigned int eventmask, struct nf_conn *ct,
+				  u32 portid, int report);
+
+static inline void
+nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
+{
+	struct net *net = nf_ct_net(ct);
+	struct nf_conntrack_ecache *e;
+
+	if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
+		return;
+
+	e = nf_ct_ecache_find(ct);
+	if (e == NULL)
+		return;
+
+	set_bit(event, &e->cache);
+}
+
+static inline int
+nf_conntrack_event_report(enum ip_conntrack_events event, struct nf_conn *ct,
+			  u32 portid, int report)
+{
+	const struct net *net = nf_ct_net(ct);
+
+	if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
+		return 0;
+
+	return nf_conntrack_eventmask_report(1 << event, ct, portid, report);
+}
+
+static inline int
+nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
+{
+	const struct net *net = nf_ct_net(ct);
+
+	if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
+		return 0;
+
+	return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
+}
+
+struct nf_exp_event {
+	struct nf_conntrack_expect *exp;
+	u32 portid;
+	int report;
+};
+
+struct nf_exp_event_notifier {
+	int (*fcn)(unsigned int events, struct nf_exp_event *item);
+};
+
+int nf_ct_expect_register_notifier(struct net *net,
+				   struct nf_exp_event_notifier *nb);
+void nf_ct_expect_unregister_notifier(struct net *net,
+				      struct nf_exp_event_notifier *nb);
+
+void nf_ct_expect_event_report(enum ip_conntrack_expect_events event,
+			       struct nf_conntrack_expect *exp,
+			       u32 portid, int report);
+
+int nf_conntrack_ecache_pernet_init(struct net *net);
+void nf_conntrack_ecache_pernet_fini(struct net *net);
+
+int nf_conntrack_ecache_init(void);
+void nf_conntrack_ecache_fini(void);
+
+static inline void nf_conntrack_ecache_delayed_work(struct net *net)
+{
+	if (!delayed_work_pending(&net->ct.ecache_dwork)) {
+		schedule_delayed_work(&net->ct.ecache_dwork, HZ);
+		net->ct.ecache_dwork_pending = true;
+	}
+}
+
+static inline void nf_conntrack_ecache_work(struct net *net)
+{
+	if (net->ct.ecache_dwork_pending) {
+		net->ct.ecache_dwork_pending = false;
+		mod_delayed_work(system_wq, &net->ct.ecache_dwork, 0);
+	}
+}
+#else /* CONFIG_NF_CONNTRACK_EVENTS */
+static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
+					    struct nf_conn *ct) {}
+static inline int nf_conntrack_eventmask_report(unsigned int eventmask,
+						struct nf_conn *ct,
+						u32 portid,
+						int report) { return 0; }
+static inline int nf_conntrack_event(enum ip_conntrack_events event,
+				     struct nf_conn *ct) { return 0; }
+static inline int nf_conntrack_event_report(enum ip_conntrack_events event,
+					    struct nf_conn *ct,
+					    u32 portid,
+					    int report) { return 0; }
+static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
+static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e,
+					     struct nf_conntrack_expect *exp,
+ 					     u32 portid,
+ 					     int report) {}
+
+static inline int nf_conntrack_ecache_pernet_init(struct net *net)
+{
+	return 0;
+}
+
+static inline void nf_conntrack_ecache_pernet_fini(struct net *net)
+{
+}
+
+static inline int nf_conntrack_ecache_init(void)
+{
+	return 0;
+}
+
+static inline void nf_conntrack_ecache_fini(void)
+{
+}
+
+static inline void nf_conntrack_ecache_delayed_work(struct net *net)
+{
+}
+
+static inline void nf_conntrack_ecache_work(struct net *net)
+{
+}
+#endif /* CONFIG_NF_CONNTRACK_EVENTS */
+
+#endif /*_NF_CONNTRACK_ECACHE_H*/
+

include/net/netfilter/nf_conntrack_expect.h

@@ -0,0 +1,132 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * connection tracking expectations.
+ */
+
+#ifndef _NF_CONNTRACK_EXPECT_H
+#define _NF_CONNTRACK_EXPECT_H
+
+#include <linux/refcount.h>
+
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_zones.h>
+
+extern unsigned int nf_ct_expect_hsize;
+extern unsigned int nf_ct_expect_max;
+extern struct hlist_head *nf_ct_expect_hash;
+
+struct nf_conntrack_expect {
+	/* Conntrack expectation list member */
+	struct hlist_node lnode;
+
+	/* Hash member */
+	struct hlist_node hnode;
+
+	/* We expect this tuple, with the following mask */
+	struct nf_conntrack_tuple tuple;
+	struct nf_conntrack_tuple_mask mask;
+
+	/* Function to call after setup and insertion */
+	void (*expectfn)(struct nf_conn *new,
+			 struct nf_conntrack_expect *this);
+
+	/* Helper to assign to new connection */
+	struct nf_conntrack_helper *helper;
+
+	/* The conntrack of the master connection */
+	struct nf_conn *master;
+
+	/* Timer function; deletes the expectation. */
+	struct timer_list timeout;
+
+	/* Usage count. */
+	refcount_t use;
+
+	/* Flags */
+	unsigned int flags;
+
+	/* Expectation class */
+	unsigned int class;
+
+#ifdef CONFIG_NF_NAT_NEEDED
+	union nf_inet_addr saved_addr;
+	/* This is the original per-proto part, used to map the
+	 * expected connection the way the recipient expects. */
+	union nf_conntrack_man_proto saved_proto;
+	/* Direction relative to the master connection. */
+	enum ip_conntrack_dir dir;
+#endif
+
+	struct rcu_head rcu;
+};
+
+static inline struct net *nf_ct_exp_net(struct nf_conntrack_expect *exp)
+{
+	return nf_ct_net(exp->master);
+}
+
+#define NF_CT_EXP_POLICY_NAME_LEN	16
+
+struct nf_conntrack_expect_policy {
+	unsigned int	max_expected;
+	unsigned int	timeout;
+	char		name[NF_CT_EXP_POLICY_NAME_LEN];
+};
+
+#define NF_CT_EXPECT_CLASS_DEFAULT	0
+#define NF_CT_EXPECT_MAX_CNT		255
+
+int nf_conntrack_expect_pernet_init(struct net *net);
+void nf_conntrack_expect_pernet_fini(struct net *net);
+
+int nf_conntrack_expect_init(void);
+void nf_conntrack_expect_fini(void);
+
+struct nf_conntrack_expect *
+__nf_ct_expect_find(struct net *net,
+		    const struct nf_conntrack_zone *zone,
+		    const struct nf_conntrack_tuple *tuple);
+
+struct nf_conntrack_expect *
+nf_ct_expect_find_get(struct net *net,
+		      const struct nf_conntrack_zone *zone,
+		      const struct nf_conntrack_tuple *tuple);
+
+struct nf_conntrack_expect *
+nf_ct_find_expectation(struct net *net,
+		       const struct nf_conntrack_zone *zone,
+		       const struct nf_conntrack_tuple *tuple);
+
+void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp,
+				u32 portid, int report);
+static inline void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
+{
+	nf_ct_unlink_expect_report(exp, 0, 0);
+}
+
+void nf_ct_remove_expectations(struct nf_conn *ct);
+void nf_ct_unexpect_related(struct nf_conntrack_expect *exp);
+bool nf_ct_remove_expect(struct nf_conntrack_expect *exp);
+
+void nf_ct_expect_iterate_destroy(bool (*iter)(struct nf_conntrack_expect *e, void *data), void *data);
+void nf_ct_expect_iterate_net(struct net *net,
+			      bool (*iter)(struct nf_conntrack_expect *e, void *data),
+                              void *data, u32 portid, int report);
+
+/* Allocate space for an expectation: this is mandatory before calling
+   nf_ct_expect_related.  You will have to call put afterwards. */
+struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me);
+void nf_ct_expect_init(struct nf_conntrack_expect *, unsigned int, u_int8_t,
+		       const union nf_inet_addr *,
+		       const union nf_inet_addr *,
+		       u_int8_t, const __be16 *, const __be16 *);
+void nf_ct_expect_put(struct nf_conntrack_expect *exp);
+int nf_ct_expect_related_report(struct nf_conntrack_expect *expect, 
+				u32 portid, int report);
+static inline int nf_ct_expect_related(struct nf_conntrack_expect *expect)
+{
+	return nf_ct_expect_related_report(expect, 0, 0);
+}
+
+#endif /*_NF_CONNTRACK_EXPECT_H*/
+

include/net/netfilter/nf_conntrack_extend.h

@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_CONNTRACK_EXTEND_H
+#define _NF_CONNTRACK_EXTEND_H
+
+#include <linux/slab.h>
+
+#include <net/netfilter/nf_conntrack.h>
+
+enum nf_ct_ext_id {
+	NF_CT_EXT_HELPER,
+#if defined(CONFIG_NF_NAT) || defined(CONFIG_NF_NAT_MODULE)
+	NF_CT_EXT_NAT,
+#endif
+	NF_CT_EXT_SEQADJ,
+	NF_CT_EXT_ACCT,
+#ifdef CONFIG_NF_CONNTRACK_EVENTS
+	NF_CT_EXT_ECACHE,
+#endif
+#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
+	NF_CT_EXT_TSTAMP,
+#endif
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+	NF_CT_EXT_TIMEOUT,
+#endif
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+	NF_CT_EXT_LABELS,
+#endif
+#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
+	NF_CT_EXT_SYNPROXY,
+#endif
+	NF_CT_EXT_NUM,
+};
+
+#define NF_CT_EXT_HELPER_TYPE struct nf_conn_help
+#define NF_CT_EXT_NAT_TYPE struct nf_conn_nat
+#define NF_CT_EXT_SEQADJ_TYPE struct nf_conn_seqadj
+#define NF_CT_EXT_ACCT_TYPE struct nf_conn_acct
+#define NF_CT_EXT_ECACHE_TYPE struct nf_conntrack_ecache
+#define NF_CT_EXT_TSTAMP_TYPE struct nf_conn_tstamp
+#define NF_CT_EXT_TIMEOUT_TYPE struct nf_conn_timeout
+#define NF_CT_EXT_LABELS_TYPE struct nf_conn_labels
+#define NF_CT_EXT_SYNPROXY_TYPE struct nf_conn_synproxy
+
+/* Extensions: optional stuff which isn't permanently in struct. */
+struct nf_ct_ext {
+	struct rcu_head rcu;
+	u8 offset[NF_CT_EXT_NUM];
+	u8 len;
+	char data[0];
+};
+
+static inline bool __nf_ct_ext_exist(const struct nf_ct_ext *ext, u8 id)
+{
+	return !!ext->offset[id];
+}
+
+static inline bool nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
+{
+	return (ct->ext && __nf_ct_ext_exist(ct->ext, id));
+}
+
+static inline void *__nf_ct_ext_find(const struct nf_conn *ct, u8 id)
+{
+	if (!nf_ct_ext_exist(ct, id))
+		return NULL;
+
+	return (void *)ct->ext + ct->ext->offset[id];
+}
+#define nf_ct_ext_find(ext, id)	\
+	((id##_TYPE *)__nf_ct_ext_find((ext), (id)))
+
+/* Destroy all relationships */
+void nf_ct_ext_destroy(struct nf_conn *ct);
+
+/* Free operation. If you want to free a object referred from private area,
+ * please implement __nf_ct_ext_free() and call it.
+ */
+static inline void nf_ct_ext_free(struct nf_conn *ct)
+{
+	if (ct->ext)
+		kfree_rcu(ct->ext, rcu);
+}
+
+/* Add this type, returns pointer to data or NULL. */
+void *nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp);
+
+struct nf_ct_ext_type {
+	/* Destroys relationships (can be NULL). */
+	void (*destroy)(struct nf_conn *ct);
+
+	enum nf_ct_ext_id id;
+
+	/* Length and min alignment. */
+	u8 len;
+	u8 align;
+};
+
+int nf_ct_extend_register(const struct nf_ct_ext_type *type);
+void nf_ct_extend_unregister(const struct nf_ct_ext_type *type);
+#endif /* _NF_CONNTRACK_EXTEND_H */

include/net/netfilter/nf_conntrack_helper.h

@@ -0,0 +1,157 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * connection tracking helpers.
+ *
+ * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
+ *	- generalize L3 protocol dependent part.
+ *
+ * Derived from include/linux/netfiter_ipv4/ip_conntrack_helper.h
+ */
+
+#ifndef _NF_CONNTRACK_HELPER_H
+#define _NF_CONNTRACK_HELPER_H
+#include <linux/refcount.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_extend.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+
+struct module;
+
+enum nf_ct_helper_flags {
+	NF_CT_HELPER_F_USERSPACE	= (1 << 0),
+	NF_CT_HELPER_F_CONFIGURED	= (1 << 1),
+};
+
+#define NF_CT_HELPER_NAME_LEN	16
+
+struct nf_conntrack_helper {
+	struct hlist_node hnode;	/* Internal use. */
+
+	char name[NF_CT_HELPER_NAME_LEN]; /* name of the module */
+	refcount_t refcnt;
+	struct module *me;		/* pointer to self */
+	const struct nf_conntrack_expect_policy *expect_policy;
+
+	/* Tuple of things we will help (compared against server response) */
+	struct nf_conntrack_tuple tuple;
+
+	/* Function to call when data passes; return verdict, or -1 to
+           invalidate. */
+	int (*help)(struct sk_buff *skb,
+		    unsigned int protoff,
+		    struct nf_conn *ct,
+		    enum ip_conntrack_info conntrackinfo);
+
+	void (*destroy)(struct nf_conn *ct);
+
+	int (*from_nlattr)(struct nlattr *attr, struct nf_conn *ct);
+	int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct);
+	unsigned int expect_class_max;
+
+	unsigned int flags;
+
+	/* For user-space helpers: */
+	unsigned int queue_num;
+	/* length of userspace private data stored in nf_conn_help->data */
+	u16 data_len;
+};
+
+/* Must be kept in sync with the classes defined by helpers */
+#define NF_CT_MAX_EXPECT_CLASSES	4
+
+/* nf_conn feature for connections that have a helper */
+struct nf_conn_help {
+	/* Helper. if any */
+	struct nf_conntrack_helper __rcu *helper;
+
+	struct hlist_head expectations;
+
+	/* Current number of expected connections */
+	u8 expecting[NF_CT_MAX_EXPECT_CLASSES];
+
+	/* private helper information. */
+	char data[32] __aligned(8);
+};
+
+#define NF_CT_HELPER_BUILD_BUG_ON(structsize) \
+	BUILD_BUG_ON((structsize) > FIELD_SIZEOF(struct nf_conn_help, data))
+
+struct nf_conntrack_helper *__nf_conntrack_helper_find(const char *name,
+						       u16 l3num, u8 protonum);
+
+struct nf_conntrack_helper *nf_conntrack_helper_try_module_get(const char *name,
+							       u16 l3num,
+							       u8 protonum);
+void nf_conntrack_helper_put(struct nf_conntrack_helper *helper);
+
+void nf_ct_helper_init(struct nf_conntrack_helper *helper,
+		       u16 l3num, u16 protonum, const char *name,
+		       u16 default_port, u16 spec_port, u32 id,
+		       const struct nf_conntrack_expect_policy *exp_pol,
+		       u32 expect_class_max,
+		       int (*help)(struct sk_buff *skb, unsigned int protoff,
+				   struct nf_conn *ct,
+				   enum ip_conntrack_info ctinfo),
+		       int (*from_nlattr)(struct nlattr *attr,
+					  struct nf_conn *ct),
+		       struct module *module);
+
+int nf_conntrack_helper_register(struct nf_conntrack_helper *);
+void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
+
+int nf_conntrack_helpers_register(struct nf_conntrack_helper *, unsigned int);
+void nf_conntrack_helpers_unregister(struct nf_conntrack_helper *,
+				     unsigned int);
+
+struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp);
+
+int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
+			      gfp_t flags);
+
+void nf_ct_helper_destroy(struct nf_conn *ct);
+
+static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
+{
+	return nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
+}
+
+static inline void *nfct_help_data(const struct nf_conn *ct)
+{
+	struct nf_conn_help *help;
+
+	help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
+
+	return (void *)help->data;
+}
+
+int nf_conntrack_helper_pernet_init(struct net *net);
+void nf_conntrack_helper_pernet_fini(struct net *net);
+
+int nf_conntrack_helper_init(void);
+void nf_conntrack_helper_fini(void);
+
+int nf_conntrack_broadcast_help(struct sk_buff *skb, struct nf_conn *ct,
+				enum ip_conntrack_info ctinfo,
+				unsigned int timeout);
+
+struct nf_ct_helper_expectfn {
+	struct list_head head;
+	const char *name;
+	void (*expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
+};
+
+__printf(3,4)
+void nf_ct_helper_log(struct sk_buff *skb, const struct nf_conn *ct,
+		      const char *fmt, ...);
+
+void nf_ct_helper_expectfn_register(struct nf_ct_helper_expectfn *n);
+void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn *n);
+struct nf_ct_helper_expectfn *
+nf_ct_helper_expectfn_find_by_name(const char *name);
+struct nf_ct_helper_expectfn *
+nf_ct_helper_expectfn_find_by_symbol(const void *symbol);
+
+extern struct hlist_head *nf_ct_helper_hash;
+extern unsigned int nf_ct_helper_hsize;
+
+#endif /*_NF_CONNTRACK_HELPER_H*/

include/net/netfilter/nf_conntrack_l4proto.h

@@ -0,0 +1,160 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Header for use in defining a given L4 protocol for connection tracking.
+ *
+ * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
+ *	- generalized L3 protocol dependent part.
+ *
+ * Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h
+ */
+
+#ifndef _NF_CONNTRACK_L4PROTO_H
+#define _NF_CONNTRACK_L4PROTO_H
+#include <linux/netlink.h>
+#include <net/netlink.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netns/generic.h>
+
+struct seq_file;
+
+struct nf_conntrack_l4proto {
+	/* L3 Protocol number. */
+	u_int16_t l3proto;
+
+	/* L4 Protocol number. */
+	u_int8_t l4proto;
+
+	/* Resolve clashes on insertion races. */
+	bool allow_clash;
+
+	/* protoinfo nlattr size, closes a hole */
+	u16 nlattr_size;
+
+	/* Try to fill in the third arg: dataoff is offset past network protocol
+           hdr.  Return true if possible. */
+	bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff,
+			     struct net *net, struct nf_conntrack_tuple *tuple);
+
+	/* Invert the per-proto part of the tuple: ie. turn xmit into reply.
+	 * Only used by icmp, most protocols use a generic version.
+	 */
+	bool (*invert_tuple)(struct nf_conntrack_tuple *inverse,
+			     const struct nf_conntrack_tuple *orig);
+
+	/* Returns verdict for packet, or -1 for invalid. */
+	int (*packet)(struct nf_conn *ct,
+		      const struct sk_buff *skb,
+		      unsigned int dataoff,
+		      enum ip_conntrack_info ctinfo);
+
+	/* Called when a new connection for this protocol found;
+	 * returns TRUE if it's OK.  If so, packet() called next. */
+	bool (*new)(struct nf_conn *ct, const struct sk_buff *skb,
+		    unsigned int dataoff);
+
+	/* Called when a conntrack entry is destroyed */
+	void (*destroy)(struct nf_conn *ct);
+
+	int (*error)(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
+		     unsigned int dataoff,
+		     u_int8_t pf, unsigned int hooknum);
+
+	/* called by gc worker if table is full */
+	bool (*can_early_drop)(const struct nf_conn *ct);
+
+	/* convert protoinfo to nfnetink attributes */
+	int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
+			 struct nf_conn *ct);
+
+	/* convert nfnetlink attributes to protoinfo */
+	int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct);
+
+	int (*tuple_to_nlattr)(struct sk_buff *skb,
+			       const struct nf_conntrack_tuple *t);
+	/* Calculate tuple nlattr size */
+	unsigned int (*nlattr_tuple_size)(void);
+	int (*nlattr_to_tuple)(struct nlattr *tb[],
+			       struct nf_conntrack_tuple *t);
+	const struct nla_policy *nla_policy;
+
+	struct {
+		int (*nlattr_to_obj)(struct nlattr *tb[],
+				     struct net *net, void *data);
+		int (*obj_to_nlattr)(struct sk_buff *skb, const void *data);
+
+		u16 obj_size;
+		u16 nlattr_max;
+		const struct nla_policy *nla_policy;
+	} ctnl_timeout;
+#ifdef CONFIG_NF_CONNTRACK_PROCFS
+	/* Print out the private part of the conntrack. */
+	void (*print_conntrack)(struct seq_file *s, struct nf_conn *);
+#endif
+	unsigned int	*net_id;
+	/* Init l4proto pernet data */
+	int (*init_net)(struct net *net, u_int16_t proto);
+
+	/* Return the per-net protocol part. */
+	struct nf_proto_net *(*get_net_proto)(struct net *net);
+
+	/* Module (if any) which this is connected to. */
+	struct module *me;
+};
+
+/* Existing built-in generic protocol */
+extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
+
+#define MAX_NF_CT_PROTO 256
+
+const struct nf_conntrack_l4proto *__nf_ct_l4proto_find(u_int16_t l3proto,
+						  u_int8_t l4proto);
+
+const struct nf_conntrack_l4proto *nf_ct_l4proto_find_get(u_int16_t l3proto,
+						    u_int8_t l4proto);
+void nf_ct_l4proto_put(const struct nf_conntrack_l4proto *p);
+
+/* Protocol pernet registration. */
+int nf_ct_l4proto_pernet_register_one(struct net *net,
+				const struct nf_conntrack_l4proto *proto);
+void nf_ct_l4proto_pernet_unregister_one(struct net *net,
+				const struct nf_conntrack_l4proto *proto);
+int nf_ct_l4proto_pernet_register(struct net *net,
+				  const struct nf_conntrack_l4proto *const proto[],
+				  unsigned int num_proto);
+void nf_ct_l4proto_pernet_unregister(struct net *net,
+				const struct nf_conntrack_l4proto *const proto[],
+				unsigned int num_proto);
+
+/* Protocol global registration. */
+int nf_ct_l4proto_register_one(const struct nf_conntrack_l4proto *proto);
+void nf_ct_l4proto_unregister_one(const struct nf_conntrack_l4proto *proto);
+
+/* Generic netlink helpers */
+int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
+			       const struct nf_conntrack_tuple *tuple);
+int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
+			       struct nf_conntrack_tuple *t);
+unsigned int nf_ct_port_nlattr_tuple_size(void);
+extern const struct nla_policy nf_ct_port_nla_policy[];
+
+#ifdef CONFIG_SYSCTL
+__printf(3, 4) __cold
+void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
+			       const struct nf_conn *ct,
+			       const char *fmt, ...);
+__printf(5, 6) __cold
+void nf_l4proto_log_invalid(const struct sk_buff *skb,
+			    struct net *net,
+			    u16 pf, u8 protonum,
+			    const char *fmt, ...);
+#else
+static inline __printf(5, 6) __cold
+void nf_l4proto_log_invalid(const struct sk_buff *skb, struct net *net,
+			    u16 pf, u8 protonum, const char *fmt, ...) {}
+static inline __printf(3, 4) __cold
+void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
+			       const struct nf_conn *ct,
+			       const char *fmt, ...) { }
+#endif /* CONFIG_SYSCTL */
+
+#endif /*_NF_CONNTRACK_PROTOCOL_H*/

include/net/netfilter/nf_conntrack_labels.h

@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/types.h>
+#include <net/net_namespace.h>
+#include <linux/netfilter/nf_conntrack_common.h>
+#include <linux/netfilter/nf_conntrack_tuple_common.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_extend.h>
+
+#include <uapi/linux/netfilter/xt_connlabel.h>
+
+#define NF_CT_LABELS_MAX_SIZE ((XT_CONNLABEL_MAXBIT + 1) / BITS_PER_BYTE)
+
+struct nf_conn_labels {
+	unsigned long bits[NF_CT_LABELS_MAX_SIZE / sizeof(long)];
+};
+
+static inline struct nf_conn_labels *nf_ct_labels_find(const struct nf_conn *ct)
+{
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+	return nf_ct_ext_find(ct, NF_CT_EXT_LABELS);
+#else
+	return NULL;
+#endif
+}
+
+static inline struct nf_conn_labels *nf_ct_labels_ext_add(struct nf_conn *ct)
+{
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+	struct net *net = nf_ct_net(ct);
+
+	if (net->ct.labels_used == 0)
+		return NULL;
+
+	return nf_ct_ext_add(ct, NF_CT_EXT_LABELS, GFP_ATOMIC);
+#else
+	return NULL;
+#endif
+}
+
+int nf_connlabels_replace(struct nf_conn *ct,
+			  const u32 *data, const u32 *mask, unsigned int words);
+
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+int nf_conntrack_labels_init(void);
+void nf_conntrack_labels_fini(void);
+int nf_connlabels_get(struct net *net, unsigned int bit);
+void nf_connlabels_put(struct net *net);
+#else
+static inline int nf_conntrack_labels_init(void) { return 0; }
+static inline void nf_conntrack_labels_fini(void) {}
+static inline int nf_connlabels_get(struct net *net, unsigned int bit) { return 0; }
+static inline void nf_connlabels_put(struct net *net) {}
+#endif

include/net/netfilter/nf_conntrack_seqadj.h

@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_CONNTRACK_SEQADJ_H
+#define _NF_CONNTRACK_SEQADJ_H
+
+#include <net/netfilter/nf_conntrack_extend.h>
+
+/**
+ * struct nf_ct_seqadj - sequence number adjustment information
+ *
+ * @correction_pos: position of the last TCP sequence number modification
+ * @offset_before: sequence number offset before last modification
+ * @offset_after: sequence number offset after last modification
+ */
+struct nf_ct_seqadj {
+	u32		correction_pos;
+	s32		offset_before;
+	s32		offset_after;
+};
+
+struct nf_conn_seqadj {
+	struct nf_ct_seqadj	seq[IP_CT_DIR_MAX];
+};
+
+static inline struct nf_conn_seqadj *nfct_seqadj(const struct nf_conn *ct)
+{
+	return nf_ct_ext_find(ct, NF_CT_EXT_SEQADJ);
+}
+
+static inline struct nf_conn_seqadj *nfct_seqadj_ext_add(struct nf_conn *ct)
+{
+	return nf_ct_ext_add(ct, NF_CT_EXT_SEQADJ, GFP_ATOMIC);
+}
+
+int nf_ct_seqadj_init(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+		      s32 off);
+int nf_ct_seqadj_set(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+		     __be32 seq, s32 off);
+void nf_ct_tcp_seqadj_set(struct sk_buff *skb, struct nf_conn *ct,
+			  enum ip_conntrack_info ctinfo, s32 off);
+
+int nf_ct_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
+		     enum ip_conntrack_info ctinfo, unsigned int protoff);
+s32 nf_ct_seq_offset(const struct nf_conn *ct, enum ip_conntrack_dir, u32 seq);
+
+int nf_conntrack_seqadj_init(void);
+void nf_conntrack_seqadj_fini(void);
+
+#endif /* _NF_CONNTRACK_SEQADJ_H */

include/net/netfilter/nf_conntrack_synproxy.h

@@ -0,0 +1,92 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_CONNTRACK_SYNPROXY_H
+#define _NF_CONNTRACK_SYNPROXY_H
+
+#include <net/netns/generic.h>
+
+struct nf_conn_synproxy {
+	u32	isn;
+	u32	its;
+	u32	tsoff;
+};
+
+static inline struct nf_conn_synproxy *nfct_synproxy(const struct nf_conn *ct)
+{
+#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
+	return nf_ct_ext_find(ct, NF_CT_EXT_SYNPROXY);
+#else
+	return NULL;
+#endif
+}
+
+static inline struct nf_conn_synproxy *nfct_synproxy_ext_add(struct nf_conn *ct)
+{
+#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
+	return nf_ct_ext_add(ct, NF_CT_EXT_SYNPROXY, GFP_ATOMIC);
+#else
+	return NULL;
+#endif
+}
+
+static inline bool nf_ct_add_synproxy(struct nf_conn *ct,
+				      const struct nf_conn *tmpl)
+{
+	if (tmpl && nfct_synproxy(tmpl)) {
+		if (!nfct_seqadj_ext_add(ct))
+			return false;
+
+		if (!nfct_synproxy_ext_add(ct))
+			return false;
+	}
+
+	return true;
+}
+
+struct synproxy_stats {
+	unsigned int			syn_received;
+	unsigned int			cookie_invalid;
+	unsigned int			cookie_valid;
+	unsigned int			cookie_retrans;
+	unsigned int			conn_reopened;
+};
+
+struct synproxy_net {
+	struct nf_conn			*tmpl;
+	struct synproxy_stats __percpu	*stats;
+	unsigned int			hook_ref4;
+	unsigned int			hook_ref6;
+};
+
+extern unsigned int synproxy_net_id;
+static inline struct synproxy_net *synproxy_pernet(struct net *net)
+{
+	return net_generic(net, synproxy_net_id);
+}
+
+struct synproxy_options {
+	u8				options;
+	u8				wscale;
+	u16				mss;
+	u32				tsval;
+	u32				tsecr;
+};
+
+struct tcphdr;
+struct xt_synproxy_info;
+bool synproxy_parse_options(const struct sk_buff *skb, unsigned int doff,
+			    const struct tcphdr *th,
+			    struct synproxy_options *opts);
+unsigned int synproxy_options_size(const struct synproxy_options *opts);
+void synproxy_build_options(struct tcphdr *th,
+			    const struct synproxy_options *opts);
+
+void synproxy_init_timestamp_cookie(const struct xt_synproxy_info *info,
+				    struct synproxy_options *opts);
+void synproxy_check_timestamp_cookie(struct synproxy_options *opts);
+
+unsigned int synproxy_tstamp_adjust(struct sk_buff *skb, unsigned int protoff,
+				    struct tcphdr *th, struct nf_conn *ct,
+				    enum ip_conntrack_info ctinfo,
+				    const struct nf_conn_synproxy *synproxy);
+
+#endif /* _NF_CONNTRACK_SYNPROXY_H */

include/net/netfilter/nf_conntrack_timeout.h

@@ -0,0 +1,108 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_CONNTRACK_TIMEOUT_H
+#define _NF_CONNTRACK_TIMEOUT_H
+
+#include <net/net_namespace.h>
+#include <linux/netfilter/nf_conntrack_common.h>
+#include <linux/netfilter/nf_conntrack_tuple_common.h>
+#include <linux/refcount.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_extend.h>
+
+#define CTNL_TIMEOUT_NAME_MAX	32
+
+struct nf_ct_timeout {
+	__u16			l3num;
+	const struct nf_conntrack_l4proto *l4proto;
+	char			data[0];
+};
+
+struct ctnl_timeout {
+	struct list_head	head;
+	struct rcu_head		rcu_head;
+	refcount_t		refcnt;
+	char			name[CTNL_TIMEOUT_NAME_MAX];
+	struct nf_ct_timeout	timeout;
+};
+
+struct nf_conn_timeout {
+	struct nf_ct_timeout __rcu *timeout;
+};
+
+static inline unsigned int *
+nf_ct_timeout_data(const struct nf_conn_timeout *t)
+{
+	struct nf_ct_timeout *timeout;
+
+	timeout = rcu_dereference(t->timeout);
+	if (timeout == NULL)
+		return NULL;
+
+	return (unsigned int *)timeout->data;
+}
+
+static inline
+struct nf_conn_timeout *nf_ct_timeout_find(const struct nf_conn *ct)
+{
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+	return nf_ct_ext_find(ct, NF_CT_EXT_TIMEOUT);
+#else
+	return NULL;
+#endif
+}
+
+static inline
+struct nf_conn_timeout *nf_ct_timeout_ext_add(struct nf_conn *ct,
+					      struct nf_ct_timeout *timeout,
+					      gfp_t gfp)
+{
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+	struct nf_conn_timeout *timeout_ext;
+
+	timeout_ext = nf_ct_ext_add(ct, NF_CT_EXT_TIMEOUT, gfp);
+	if (timeout_ext == NULL)
+		return NULL;
+
+	rcu_assign_pointer(timeout_ext->timeout, timeout);
+
+	return timeout_ext;
+#else
+	return NULL;
+#endif
+};
+
+static inline unsigned int *nf_ct_timeout_lookup(const struct nf_conn *ct)
+{
+	unsigned int *timeouts = NULL;
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+	struct nf_conn_timeout *timeout_ext;
+
+	timeout_ext = nf_ct_timeout_find(ct);
+	if (timeout_ext)
+		timeouts = nf_ct_timeout_data(timeout_ext);
+#endif
+	return timeouts;
+}
+
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+int nf_conntrack_timeout_init(void);
+void nf_conntrack_timeout_fini(void);
+void nf_ct_untimeout(struct net *net, struct nf_ct_timeout *timeout);
+#else
+static inline int nf_conntrack_timeout_init(void)
+{
+        return 0;
+}
+
+static inline void nf_conntrack_timeout_fini(void)
+{
+        return;
+}
+#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
+
+#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
+extern struct nf_ct_timeout *(*nf_ct_timeout_find_get_hook)(struct net *net, const char *name);
+extern void (*nf_ct_timeout_put_hook)(struct nf_ct_timeout *timeout);
+#endif
+
+#endif /* _NF_CONNTRACK_TIMEOUT_H */

include/net/netfilter/nf_conntrack_timestamp.h

@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_CONNTRACK_TSTAMP_H
+#define _NF_CONNTRACK_TSTAMP_H
+
+#include <net/net_namespace.h>
+#include <linux/netfilter/nf_conntrack_common.h>
+#include <linux/netfilter/nf_conntrack_tuple_common.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_extend.h>
+
+struct nf_conn_tstamp {
+	u_int64_t start;
+	u_int64_t stop;
+};
+
+static inline
+struct nf_conn_tstamp *nf_conn_tstamp_find(const struct nf_conn *ct)
+{
+#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
+	return nf_ct_ext_find(ct, NF_CT_EXT_TSTAMP);
+#else
+	return NULL;
+#endif
+}
+
+static inline
+struct nf_conn_tstamp *nf_ct_tstamp_ext_add(struct nf_conn *ct, gfp_t gfp)
+{
+#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
+	struct net *net = nf_ct_net(ct);
+
+	if (!net->ct.sysctl_tstamp)
+		return NULL;
+
+	return nf_ct_ext_add(ct, NF_CT_EXT_TSTAMP, gfp);
+#else
+	return NULL;
+#endif
+};
+
+static inline bool nf_ct_tstamp_enabled(struct net *net)
+{
+	return net->ct.sysctl_tstamp != 0;
+}
+
+static inline void nf_ct_set_tstamp(struct net *net, bool enable)
+{
+	net->ct.sysctl_tstamp = enable;
+}
+
+#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
+int nf_conntrack_tstamp_pernet_init(struct net *net);
+void nf_conntrack_tstamp_pernet_fini(struct net *net);
+
+int nf_conntrack_tstamp_init(void);
+void nf_conntrack_tstamp_fini(void);
+#else
+static inline int nf_conntrack_tstamp_pernet_init(struct net *net)
+{
+	return 0;
+}
+
+static inline void nf_conntrack_tstamp_pernet_fini(struct net *net)
+{
+	return;
+}
+
+static inline int nf_conntrack_tstamp_init(void)
+{
+	return 0;
+}
+
+static inline void nf_conntrack_tstamp_fini(void)
+{
+	return;
+}
+#endif /* CONFIG_NF_CONNTRACK_TIMESTAMP */
+
+#endif /* _NF_CONNTRACK_TSTAMP_H */

include/net/netfilter/nf_conntrack_tuple.h

@@ -0,0 +1,187 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Definitions and Declarations for tuple.
+ *
+ * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
+ *	- generalize L3 protocol dependent part.
+ *
+ * Derived from include/linux/netfiter_ipv4/ip_conntrack_tuple.h
+ */
+
+#ifndef _NF_CONNTRACK_TUPLE_H
+#define _NF_CONNTRACK_TUPLE_H
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/nf_conntrack_tuple_common.h>
+#include <linux/list_nulls.h>
+
+/* A `tuple' is a structure containing the information to uniquely
+  identify a connection.  ie. if two packets have the same tuple, they
+  are in the same connection; if not, they are not.
+
+  We divide the structure along "manipulatable" and
+  "non-manipulatable" lines, for the benefit of the NAT code.
+*/
+
+#define NF_CT_TUPLE_L3SIZE	ARRAY_SIZE(((union nf_inet_addr *)NULL)->all)
+
+/* The manipulable part of the tuple. */
+struct nf_conntrack_man {
+	union nf_inet_addr u3;
+	union nf_conntrack_man_proto u;
+	/* Layer 3 protocol */
+	u_int16_t l3num;
+};
+
+/* This contains the information to distinguish a connection. */
+struct nf_conntrack_tuple {
+	struct nf_conntrack_man src;
+
+	/* These are the parts of the tuple which are fixed. */
+	struct {
+		union nf_inet_addr u3;
+		union {
+			/* Add other protocols here. */
+			__be16 all;
+
+			struct {
+				__be16 port;
+			} tcp;
+			struct {
+				__be16 port;
+			} udp;
+			struct {
+				u_int8_t type, code;
+			} icmp;
+			struct {
+				__be16 port;
+			} dccp;
+			struct {
+				__be16 port;
+			} sctp;
+			struct {
+				__be16 key;
+			} gre;
+		} u;
+
+		/* The protocol. */
+		u_int8_t protonum;
+
+		/* The direction (for tuplehash) */
+		u_int8_t dir;
+	} dst;
+};
+
+struct nf_conntrack_tuple_mask {
+	struct {
+		union nf_inet_addr u3;
+		union nf_conntrack_man_proto u;
+	} src;
+};
+
+static inline void nf_ct_dump_tuple_ip(const struct nf_conntrack_tuple *t)
+{
+#ifdef DEBUG
+	printk("tuple %p: %u %pI4:%hu -> %pI4:%hu\n",
+	       t, t->dst.protonum,
+	       &t->src.u3.ip, ntohs(t->src.u.all),
+	       &t->dst.u3.ip, ntohs(t->dst.u.all));
+#endif
+}
+
+static inline void nf_ct_dump_tuple_ipv6(const struct nf_conntrack_tuple *t)
+{
+#ifdef DEBUG
+	printk("tuple %p: %u %pI6 %hu -> %pI6 %hu\n",
+	       t, t->dst.protonum,
+	       t->src.u3.all, ntohs(t->src.u.all),
+	       t->dst.u3.all, ntohs(t->dst.u.all));
+#endif
+}
+
+static inline void nf_ct_dump_tuple(const struct nf_conntrack_tuple *t)
+{
+	switch (t->src.l3num) {
+	case AF_INET:
+		nf_ct_dump_tuple_ip(t);
+		break;
+	case AF_INET6:
+		nf_ct_dump_tuple_ipv6(t);
+		break;
+	}
+}
+
+/* If we're the first tuple, it's the original dir. */
+#define NF_CT_DIRECTION(h)						\
+	((enum ip_conntrack_dir)(h)->tuple.dst.dir)
+
+/* Connections have two entries in the hash table: one for each way */
+struct nf_conntrack_tuple_hash {
+	struct hlist_nulls_node hnnode;
+	struct nf_conntrack_tuple tuple;
+};
+
+static inline bool __nf_ct_tuple_src_equal(const struct nf_conntrack_tuple *t1,
+					   const struct nf_conntrack_tuple *t2)
+{ 
+	return (nf_inet_addr_cmp(&t1->src.u3, &t2->src.u3) &&
+		t1->src.u.all == t2->src.u.all &&
+		t1->src.l3num == t2->src.l3num);
+}
+
+static inline bool __nf_ct_tuple_dst_equal(const struct nf_conntrack_tuple *t1,
+					   const struct nf_conntrack_tuple *t2)
+{
+	return (nf_inet_addr_cmp(&t1->dst.u3, &t2->dst.u3) &&
+		t1->dst.u.all == t2->dst.u.all &&
+		t1->dst.protonum == t2->dst.protonum);
+}
+
+static inline bool nf_ct_tuple_equal(const struct nf_conntrack_tuple *t1,
+				     const struct nf_conntrack_tuple *t2)
+{
+	return __nf_ct_tuple_src_equal(t1, t2) &&
+	       __nf_ct_tuple_dst_equal(t1, t2);
+}
+
+static inline bool
+nf_ct_tuple_mask_equal(const struct nf_conntrack_tuple_mask *m1,
+		       const struct nf_conntrack_tuple_mask *m2)
+{
+	return (nf_inet_addr_cmp(&m1->src.u3, &m2->src.u3) &&
+		m1->src.u.all == m2->src.u.all);
+}
+
+static inline bool
+nf_ct_tuple_src_mask_cmp(const struct nf_conntrack_tuple *t1,
+			 const struct nf_conntrack_tuple *t2,
+			 const struct nf_conntrack_tuple_mask *mask)
+{
+	int count;
+
+	for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++) {
+		if ((t1->src.u3.all[count] ^ t2->src.u3.all[count]) &
+		    mask->src.u3.all[count])
+			return false;
+	}
+
+	if ((t1->src.u.all ^ t2->src.u.all) & mask->src.u.all)
+		return false;
+
+	if (t1->src.l3num != t2->src.l3num ||
+	    t1->dst.protonum != t2->dst.protonum)
+		return false;
+
+	return true;
+}
+
+static inline bool
+nf_ct_tuple_mask_cmp(const struct nf_conntrack_tuple *t,
+		     const struct nf_conntrack_tuple *tuple,
+		     const struct nf_conntrack_tuple_mask *mask)
+{
+	return nf_ct_tuple_src_mask_cmp(t, tuple, mask) &&
+	       __nf_ct_tuple_dst_equal(t, tuple);
+}
+
+#endif /* _NF_CONNTRACK_TUPLE_H */

include/net/netfilter/nf_conntrack_zones.h

@@ -0,0 +1,91 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_CONNTRACK_ZONES_H
+#define _NF_CONNTRACK_ZONES_H
+
+#include <linux/netfilter/nf_conntrack_zones_common.h>
+
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+#include <net/netfilter/nf_conntrack_extend.h>
+
+static inline const struct nf_conntrack_zone *
+nf_ct_zone(const struct nf_conn *ct)
+{
+#ifdef CONFIG_NF_CONNTRACK_ZONES
+	return &ct->zone;
+#else
+	return &nf_ct_zone_dflt;
+#endif
+}
+
+static inline const struct nf_conntrack_zone *
+nf_ct_zone_init(struct nf_conntrack_zone *zone, u16 id, u8 dir, u8 flags)
+{
+	zone->id = id;
+	zone->flags = flags;
+	zone->dir = dir;
+
+	return zone;
+}
+
+static inline const struct nf_conntrack_zone *
+nf_ct_zone_tmpl(const struct nf_conn *tmpl, const struct sk_buff *skb,
+		struct nf_conntrack_zone *tmp)
+{
+#ifdef CONFIG_NF_CONNTRACK_ZONES
+	if (!tmpl)
+		return &nf_ct_zone_dflt;
+
+	if (tmpl->zone.flags & NF_CT_FLAG_MARK)
+		return nf_ct_zone_init(tmp, skb->mark, tmpl->zone.dir, 0);
+#endif
+	return nf_ct_zone(tmpl);
+}
+
+static inline void nf_ct_zone_add(struct nf_conn *ct,
+				  const struct nf_conntrack_zone *zone)
+{
+#ifdef CONFIG_NF_CONNTRACK_ZONES
+	ct->zone = *zone;
+#endif
+}
+
+static inline bool nf_ct_zone_matches_dir(const struct nf_conntrack_zone *zone,
+					  enum ip_conntrack_dir dir)
+{
+	return zone->dir & (1 << dir);
+}
+
+static inline u16 nf_ct_zone_id(const struct nf_conntrack_zone *zone,
+				enum ip_conntrack_dir dir)
+{
+#ifdef CONFIG_NF_CONNTRACK_ZONES
+	return nf_ct_zone_matches_dir(zone, dir) ?
+	       zone->id : NF_CT_DEFAULT_ZONE_ID;
+#else
+	return NF_CT_DEFAULT_ZONE_ID;
+#endif
+}
+
+static inline bool nf_ct_zone_equal(const struct nf_conn *a,
+				    const struct nf_conntrack_zone *b,
+				    enum ip_conntrack_dir dir)
+{
+#ifdef CONFIG_NF_CONNTRACK_ZONES
+	return nf_ct_zone_id(nf_ct_zone(a), dir) ==
+	       nf_ct_zone_id(b, dir);
+#else
+	return true;
+#endif
+}
+
+static inline bool nf_ct_zone_equal_any(const struct nf_conn *a,
+					const struct nf_conntrack_zone *b)
+{
+#ifdef CONFIG_NF_CONNTRACK_ZONES
+	return nf_ct_zone(a)->id == b->id;
+#else
+	return true;
+#endif
+}
+#endif /* IS_ENABLED(CONFIG_NF_CONNTRACK) */
+#endif /* _NF_CONNTRACK_ZONES_H */

include/net/netfilter/nf_dup_netdev.h

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_DUP_NETDEV_H_
+#define _NF_DUP_NETDEV_H_
+
+void nf_dup_netdev_egress(const struct nft_pktinfo *pkt, int oif);
+void nf_fwd_netdev_egress(const struct nft_pktinfo *pkt, int oif);
+
+#endif

include/net/netfilter/nf_flow_table.h

@@ -0,0 +1,131 @@
+#ifndef _NF_FLOW_TABLE_H
+#define _NF_FLOW_TABLE_H
+
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/rhashtable-types.h>
+#include <linux/rcupdate.h>
+#include <linux/netfilter/nf_conntrack_tuple_common.h>
+#include <net/dst.h>
+
+struct nf_flowtable;
+
+struct nf_flowtable_type {
+	struct list_head		list;
+	int				family;
+	int				(*init)(struct nf_flowtable *ft);
+	void				(*free)(struct nf_flowtable *ft);
+	nf_hookfn			*hook;
+	struct module			*owner;
+};
+
+struct nf_flowtable {
+	struct list_head		list;
+	struct rhashtable		rhashtable;
+	const struct nf_flowtable_type	*type;
+	struct delayed_work		gc_work;
+};
+
+enum flow_offload_tuple_dir {
+	FLOW_OFFLOAD_DIR_ORIGINAL = IP_CT_DIR_ORIGINAL,
+	FLOW_OFFLOAD_DIR_REPLY = IP_CT_DIR_REPLY,
+	FLOW_OFFLOAD_DIR_MAX = IP_CT_DIR_MAX
+};
+
+struct flow_offload_tuple {
+	union {
+		struct in_addr		src_v4;
+		struct in6_addr		src_v6;
+	};
+	union {
+		struct in_addr		dst_v4;
+		struct in6_addr		dst_v6;
+	};
+	struct {
+		__be16			src_port;
+		__be16			dst_port;
+	};
+
+	int				iifidx;
+
+	u8				l3proto;
+	u8				l4proto;
+	u8				dir;
+
+	int				oifidx;
+
+	u16				mtu;
+
+	struct dst_entry		*dst_cache;
+};
+
+struct flow_offload_tuple_rhash {
+	struct rhash_head		node;
+	struct flow_offload_tuple	tuple;
+};
+
+#define FLOW_OFFLOAD_SNAT	0x1
+#define FLOW_OFFLOAD_DNAT	0x2
+#define FLOW_OFFLOAD_DYING	0x4
+#define FLOW_OFFLOAD_TEARDOWN	0x8
+
+struct flow_offload {
+	struct flow_offload_tuple_rhash		tuplehash[FLOW_OFFLOAD_DIR_MAX];
+	u32					flags;
+	union {
+		/* Your private driver data here. */
+		u32		timeout;
+	};
+};
+
+#define NF_FLOW_TIMEOUT (30 * HZ)
+
+struct nf_flow_route {
+	struct {
+		struct dst_entry	*dst;
+	} tuple[FLOW_OFFLOAD_DIR_MAX];
+};
+
+struct flow_offload *flow_offload_alloc(struct nf_conn *ct,
+					struct nf_flow_route *route);
+void flow_offload_free(struct flow_offload *flow);
+
+int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow);
+struct flow_offload_tuple_rhash *flow_offload_lookup(struct nf_flowtable *flow_table,
+						     struct flow_offload_tuple *tuple);
+int nf_flow_table_iterate(struct nf_flowtable *flow_table,
+			  void (*iter)(struct flow_offload *flow, void *data),
+			  void *data);
+
+void nf_flow_table_cleanup(struct net *net, struct net_device *dev);
+
+int nf_flow_table_init(struct nf_flowtable *flow_table);
+void nf_flow_table_free(struct nf_flowtable *flow_table);
+
+void flow_offload_teardown(struct flow_offload *flow);
+static inline void flow_offload_dead(struct flow_offload *flow)
+{
+	flow->flags |= FLOW_OFFLOAD_DYING;
+}
+
+int nf_flow_snat_port(const struct flow_offload *flow,
+		      struct sk_buff *skb, unsigned int thoff,
+		      u8 protocol, enum flow_offload_tuple_dir dir);
+int nf_flow_dnat_port(const struct flow_offload *flow,
+		      struct sk_buff *skb, unsigned int thoff,
+		      u8 protocol, enum flow_offload_tuple_dir dir);
+
+struct flow_ports {
+	__be16 source, dest;
+};
+
+unsigned int nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
+				     const struct nf_hook_state *state);
+unsigned int nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
+				       const struct nf_hook_state *state);
+
+#define MODULE_ALIAS_NF_FLOWTABLE(family)	\
+	MODULE_ALIAS("nf-flowtable-" __stringify(family))
+
+#endif /* _FLOW_OFFLOAD_H */

include/net/netfilter/nf_log.h

@@ -0,0 +1,126 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_LOG_H
+#define _NF_LOG_H
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_log.h>
+
+/* Log tcp sequence, tcp options, ip options and uid owning local socket */
+#define NF_LOG_DEFAULT_MASK	0x0f
+
+/* This flag indicates that copy_len field in nf_loginfo is set */
+#define NF_LOG_F_COPY_LEN	0x1
+
+enum nf_log_type {
+	NF_LOG_TYPE_LOG		= 0,
+	NF_LOG_TYPE_ULOG,
+	NF_LOG_TYPE_MAX
+};
+
+struct nf_loginfo {
+	u_int8_t type;
+	union {
+		struct {
+			/* copy_len will be used iff you set
+			 * NF_LOG_F_COPY_LEN in flags
+			 */
+			u_int32_t copy_len;
+			u_int16_t group;
+			u_int16_t qthreshold;
+			u_int16_t flags;
+		} ulog;
+		struct {
+			u_int8_t level;
+			u_int8_t logflags;
+		} log;
+	} u;
+};
+
+typedef void nf_logfn(struct net *net,
+		      u_int8_t pf,
+		      unsigned int hooknum,
+		      const struct sk_buff *skb,
+		      const struct net_device *in,
+		      const struct net_device *out,
+		      const struct nf_loginfo *li,
+		      const char *prefix);
+
+struct nf_logger {
+	char			*name;
+	enum nf_log_type	type;
+	nf_logfn 		*logfn;
+	struct module		*me;
+};
+
+/* sysctl_nf_log_all_netns - allow LOG target in all network namespaces */
+extern int sysctl_nf_log_all_netns;
+
+/* Function to register/unregister log function. */
+int nf_log_register(u_int8_t pf, struct nf_logger *logger);
+void nf_log_unregister(struct nf_logger *logger);
+
+int nf_log_set(struct net *net, u_int8_t pf, const struct nf_logger *logger);
+void nf_log_unset(struct net *net, const struct nf_logger *logger);
+
+int nf_log_bind_pf(struct net *net, u_int8_t pf,
+		   const struct nf_logger *logger);
+void nf_log_unbind_pf(struct net *net, u_int8_t pf);
+
+int nf_logger_find_get(int pf, enum nf_log_type type);
+void nf_logger_put(int pf, enum nf_log_type type);
+void nf_logger_request_module(int pf, enum nf_log_type type);
+
+#define MODULE_ALIAS_NF_LOGGER(family, type) \
+	MODULE_ALIAS("nf-logger-" __stringify(family) "-" __stringify(type))
+
+/* Calls the registered backend logging function */
+__printf(8, 9)
+void nf_log_packet(struct net *net,
+		   u_int8_t pf,
+		   unsigned int hooknum,
+		   const struct sk_buff *skb,
+		   const struct net_device *in,
+		   const struct net_device *out,
+		   const struct nf_loginfo *li,
+		   const char *fmt, ...);
+
+__printf(8, 9)
+void nf_log_trace(struct net *net,
+		  u_int8_t pf,
+		  unsigned int hooknum,
+		  const struct sk_buff *skb,
+		  const struct net_device *in,
+		  const struct net_device *out,
+		  const struct nf_loginfo *li,
+		  const char *fmt, ...);
+
+struct nf_log_buf;
+
+struct nf_log_buf *nf_log_buf_open(void);
+__printf(2, 3) int nf_log_buf_add(struct nf_log_buf *m, const char *f, ...);
+void nf_log_buf_close(struct nf_log_buf *m);
+
+/* common logging functions */
+int nf_log_dump_udp_header(struct nf_log_buf *m, const struct sk_buff *skb,
+			   u8 proto, int fragment, unsigned int offset);
+int nf_log_dump_tcp_header(struct nf_log_buf *m, const struct sk_buff *skb,
+			   u8 proto, int fragment, unsigned int offset,
+			   unsigned int logflags);
+void nf_log_dump_sk_uid_gid(struct net *net, struct nf_log_buf *m,
+			    struct sock *sk);
+void nf_log_dump_vlan(struct nf_log_buf *m, const struct sk_buff *skb);
+void nf_log_dump_packet_common(struct nf_log_buf *m, u_int8_t pf,
+			       unsigned int hooknum, const struct sk_buff *skb,
+			       const struct net_device *in,
+			       const struct net_device *out,
+			       const struct nf_loginfo *loginfo,
+			       const char *prefix);
+void nf_log_l2packet(struct net *net, u_int8_t pf,
+		     __be16 protocol,
+		     unsigned int hooknum,
+		     const struct sk_buff *skb,
+		     const struct net_device *in,
+		     const struct net_device *out,
+		     const struct nf_loginfo *loginfo, const char *prefix);
+
+#endif /* _NF_LOG_H */

include/net/netfilter/nf_nat.h

@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_NAT_H
+#define _NF_NAT_H
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter/nf_nat.h>
+#include <net/netfilter/nf_conntrack_tuple.h>
+
+enum nf_nat_manip_type {
+	NF_NAT_MANIP_SRC,
+	NF_NAT_MANIP_DST
+};
+
+/* SRC manip occurs POST_ROUTING or LOCAL_IN */
+#define HOOK2MANIP(hooknum) ((hooknum) != NF_INET_POST_ROUTING && \
+			     (hooknum) != NF_INET_LOCAL_IN)
+
+#include <linux/list.h>
+#include <linux/netfilter/nf_conntrack_pptp.h>
+#include <net/netfilter/nf_conntrack_extend.h>
+
+/* per conntrack: nat application helper private data */
+union nf_conntrack_nat_help {
+	/* insert nat helper private data here */
+#if defined(CONFIG_NF_NAT_PPTP) || defined(CONFIG_NF_NAT_PPTP_MODULE)
+	struct nf_nat_pptp nat_pptp_info;
+#endif
+};
+
+struct nf_conn;
+
+/* The structure embedded in the conntrack structure. */
+struct nf_conn_nat {
+	union nf_conntrack_nat_help help;
+#if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE_IPV4) || \
+    IS_ENABLED(CONFIG_NF_NAT_MASQUERADE_IPV6)
+	int masq_index;
+#endif
+};
+
+/* Set up the info structure to map into this range. */
+unsigned int nf_nat_setup_info(struct nf_conn *ct,
+			       const struct nf_nat_range2 *range,
+			       enum nf_nat_manip_type maniptype);
+
+extern unsigned int nf_nat_alloc_null_binding(struct nf_conn *ct,
+					      unsigned int hooknum);
+
+struct nf_conn_nat *nf_ct_nat_ext_add(struct nf_conn *ct);
+
+/* Is this tuple already taken? (not by us)*/
+int nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple,
+		      const struct nf_conn *ignored_conntrack);
+
+static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct)
+{
+#if defined(CONFIG_NF_NAT) || defined(CONFIG_NF_NAT_MODULE)
+	return nf_ct_ext_find(ct, NF_CT_EXT_NAT);
+#else
+	return NULL;
+#endif
+}
+
+static inline bool nf_nat_oif_changed(unsigned int hooknum,
+				      enum ip_conntrack_info ctinfo,
+				      struct nf_conn_nat *nat,
+				      const struct net_device *out)
+{
+#if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE_IPV4) || \
+    IS_ENABLED(CONFIG_NF_NAT_MASQUERADE_IPV6)
+	return nat && nat->masq_index && hooknum == NF_INET_POST_ROUTING &&
+	       CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL &&
+	       nat->masq_index != out->ifindex;
+#else
+	return false;
+#endif
+}
+
+int nf_nat_register_fn(struct net *net, const struct nf_hook_ops *ops,
+		       const struct nf_hook_ops *nat_ops, unsigned int ops_count);
+void nf_nat_unregister_fn(struct net *net, const struct nf_hook_ops *ops,
+			  unsigned int ops_count);
+#endif

include/net/netfilter/nf_nat_core.h

@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_NAT_CORE_H
+#define _NF_NAT_CORE_H
+#include <linux/list.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_nat.h>
+
+/* This header used to share core functionality between the standalone
+   NAT module, and the compatibility layer's use of NAT for masquerading. */
+
+unsigned int nf_nat_packet(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+			   unsigned int hooknum, struct sk_buff *skb);
+
+unsigned int
+nf_nat_inet_fn(void *priv, struct sk_buff *skb,
+	       const struct nf_hook_state *state);
+
+int nf_xfrm_me_harder(struct net *net, struct sk_buff *skb, unsigned int family);
+
+static inline int nf_nat_initialized(struct nf_conn *ct,
+				     enum nf_nat_manip_type manip)
+{
+	if (manip == NF_NAT_MANIP_SRC)
+		return ct->status & IPS_SRC_NAT_DONE;
+	else
+		return ct->status & IPS_DST_NAT_DONE;
+}
+
+#endif /* _NF_NAT_CORE_H */

include/net/netfilter/nf_nat_helper.h

@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_NAT_HELPER_H
+#define _NF_NAT_HELPER_H
+/* NAT protocol helper routines. */
+
+#include <net/netfilter/nf_conntrack.h>
+
+struct sk_buff;
+
+/* These return true or false. */
+bool __nf_nat_mangle_tcp_packet(struct sk_buff *skb, struct nf_conn *ct,
+				enum ip_conntrack_info ctinfo,
+				unsigned int protoff, unsigned int match_offset,
+				unsigned int match_len, const char *rep_buffer,
+				unsigned int rep_len, bool adjust);
+
+static inline bool nf_nat_mangle_tcp_packet(struct sk_buff *skb,
+					    struct nf_conn *ct,
+					    enum ip_conntrack_info ctinfo,
+					    unsigned int protoff,
+					    unsigned int match_offset,
+					    unsigned int match_len,
+					    const char *rep_buffer,
+					    unsigned int rep_len)
+{
+	return __nf_nat_mangle_tcp_packet(skb, ct, ctinfo, protoff,
+					  match_offset, match_len,
+					  rep_buffer, rep_len, true);
+}
+
+bool nf_nat_mangle_udp_packet(struct sk_buff *skb, struct nf_conn *ct,
+			      enum ip_conntrack_info ctinfo,
+			      unsigned int protoff, unsigned int match_offset,
+			      unsigned int match_len, const char *rep_buffer,
+			      unsigned int rep_len);
+
+/* Setup NAT on this expected conntrack so it follows master, but goes
+ * to port ct->master->saved_proto. */
+void nf_nat_follow_master(struct nf_conn *ct, struct nf_conntrack_expect *this);
+
+#endif

include/net/netfilter/nf_nat_l3proto.h

@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_NAT_L3PROTO_H
+#define _NF_NAT_L3PROTO_H
+
+struct nf_nat_l4proto;
+struct nf_nat_l3proto {
+	u8	l3proto;
+
+	bool	(*in_range)(const struct nf_conntrack_tuple *t,
+			    const struct nf_nat_range2 *range);
+
+	u32 	(*secure_port)(const struct nf_conntrack_tuple *t, __be16);
+
+	bool	(*manip_pkt)(struct sk_buff *skb,
+			     unsigned int iphdroff,
+			     const struct nf_nat_l4proto *l4proto,
+			     const struct nf_conntrack_tuple *target,
+			     enum nf_nat_manip_type maniptype);
+
+	void	(*csum_update)(struct sk_buff *skb, unsigned int iphdroff,
+			       __sum16 *check,
+			       const struct nf_conntrack_tuple *t,
+			       enum nf_nat_manip_type maniptype);
+
+	void	(*csum_recalc)(struct sk_buff *skb, u8 proto,
+			       void *data, __sum16 *check,
+			       int datalen, int oldlen);
+
+	void	(*decode_session)(struct sk_buff *skb,
+				  const struct nf_conn *ct,
+				  enum ip_conntrack_dir dir,
+				  unsigned long statusbit,
+				  struct flowi *fl);
+
+	int	(*nlattr_to_range)(struct nlattr *tb[],
+				   struct nf_nat_range2 *range);
+};
+
+int nf_nat_l3proto_register(const struct nf_nat_l3proto *);
+void nf_nat_l3proto_unregister(const struct nf_nat_l3proto *);
+const struct nf_nat_l3proto *__nf_nat_l3proto_find(u8 l3proto);
+
+int nf_nat_icmp_reply_translation(struct sk_buff *skb, struct nf_conn *ct,
+				  enum ip_conntrack_info ctinfo,
+				  unsigned int hooknum);
+
+int nf_nat_icmpv6_reply_translation(struct sk_buff *skb, struct nf_conn *ct,
+				    enum ip_conntrack_info ctinfo,
+				    unsigned int hooknum, unsigned int hdrlen);
+
+int nf_nat_l3proto_ipv4_register_fn(struct net *net, const struct nf_hook_ops *ops);
+void nf_nat_l3proto_ipv4_unregister_fn(struct net *net, const struct nf_hook_ops *ops);
+
+int nf_nat_l3proto_ipv6_register_fn(struct net *net, const struct nf_hook_ops *ops);
+void nf_nat_l3proto_ipv6_unregister_fn(struct net *net, const struct nf_hook_ops *ops);
+
+#endif /* _NF_NAT_L3PROTO_H */

include/net/netfilter/nf_nat_l4proto.h

@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Header for use in defining a given protocol. */
+#ifndef _NF_NAT_L4PROTO_H
+#define _NF_NAT_L4PROTO_H
+#include <net/netfilter/nf_nat.h>
+#include <linux/netfilter/nfnetlink_conntrack.h>
+
+struct nf_nat_range;
+struct nf_nat_l3proto;
+
+struct nf_nat_l4proto {
+	/* Protocol number. */
+	u8 l4proto;
+
+	/* Translate a packet to the target according to manip type.
+	 * Return true if succeeded.
+	 */
+	bool (*manip_pkt)(struct sk_buff *skb,
+			  const struct nf_nat_l3proto *l3proto,
+			  unsigned int iphdroff, unsigned int hdroff,
+			  const struct nf_conntrack_tuple *tuple,
+			  enum nf_nat_manip_type maniptype);
+
+	/* Is the manipable part of the tuple between min and max incl? */
+	bool (*in_range)(const struct nf_conntrack_tuple *tuple,
+			 enum nf_nat_manip_type maniptype,
+			 const union nf_conntrack_man_proto *min,
+			 const union nf_conntrack_man_proto *max);
+
+	/* Alter the per-proto part of the tuple (depending on
+	 * maniptype), to give a unique tuple in the given range if
+	 * possible.  Per-protocol part of tuple is initialized to the
+	 * incoming packet.
+	 */
+	void (*unique_tuple)(const struct nf_nat_l3proto *l3proto,
+			     struct nf_conntrack_tuple *tuple,
+			     const struct nf_nat_range2 *range,
+			     enum nf_nat_manip_type maniptype,
+			     const struct nf_conn *ct);
+
+	int (*nlattr_to_range)(struct nlattr *tb[],
+			       struct nf_nat_range2 *range);
+};
+
+/* Protocol registration. */
+int nf_nat_l4proto_register(u8 l3proto, const struct nf_nat_l4proto *l4proto);
+void nf_nat_l4proto_unregister(u8 l3proto,
+			       const struct nf_nat_l4proto *l4proto);
+
+const struct nf_nat_l4proto *__nf_nat_l4proto_find(u8 l3proto, u8 l4proto);
+
+/* Built-in protocols. */
+extern const struct nf_nat_l4proto nf_nat_l4proto_tcp;
+extern const struct nf_nat_l4proto nf_nat_l4proto_udp;
+extern const struct nf_nat_l4proto nf_nat_l4proto_icmp;
+extern const struct nf_nat_l4proto nf_nat_l4proto_icmpv6;
+extern const struct nf_nat_l4proto nf_nat_l4proto_unknown;
+#ifdef CONFIG_NF_NAT_PROTO_DCCP
+extern const struct nf_nat_l4proto nf_nat_l4proto_dccp;
+#endif
+#ifdef CONFIG_NF_NAT_PROTO_SCTP
+extern const struct nf_nat_l4proto nf_nat_l4proto_sctp;
+#endif
+#ifdef CONFIG_NF_NAT_PROTO_UDPLITE
+extern const struct nf_nat_l4proto nf_nat_l4proto_udplite;
+#endif
+
+bool nf_nat_l4proto_in_range(const struct nf_conntrack_tuple *tuple,
+			     enum nf_nat_manip_type maniptype,
+			     const union nf_conntrack_man_proto *min,
+			     const union nf_conntrack_man_proto *max);
+
+void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto,
+				 struct nf_conntrack_tuple *tuple,
+				 const struct nf_nat_range2 *range,
+				 enum nf_nat_manip_type maniptype,
+				 const struct nf_conn *ct, u16 *rover);
+
+int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[],
+				   struct nf_nat_range2 *range);
+
+#endif /*_NF_NAT_L4PROTO_H*/

include/net/netfilter/nf_nat_redirect.h

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_NAT_REDIRECT_H_
+#define _NF_NAT_REDIRECT_H_
+
+unsigned int
+nf_nat_redirect_ipv4(struct sk_buff *skb,
+		     const struct nf_nat_ipv4_multi_range_compat *mr,
+		     unsigned int hooknum);
+unsigned int
+nf_nat_redirect_ipv6(struct sk_buff *skb, const struct nf_nat_range2 *range,
+		     unsigned int hooknum);
+
+#endif /* _NF_NAT_REDIRECT_H_ */

include/net/netfilter/nf_queue.h

@@ -0,0 +1,122 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_QUEUE_H
+#define _NF_QUEUE_H
+
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/jhash.h>
+
+/* Each queued (to userspace) skbuff has one of these. */
+struct nf_queue_entry {
+	struct list_head	list;
+	struct sk_buff		*skb;
+	unsigned int		id;
+	unsigned int		hook_index;	/* index in hook_entries->hook[] */
+
+	struct nf_hook_state	state;
+	u16			size; /* sizeof(entry) + saved route keys */
+
+	/* extra space to store route keys */
+};
+
+#define nf_queue_entry_reroute(x) ((void *)x + sizeof(struct nf_queue_entry))
+
+/* Packet queuing */
+struct nf_queue_handler {
+	int		(*outfn)(struct nf_queue_entry *entry,
+				 unsigned int queuenum);
+	void		(*nf_hook_drop)(struct net *net);
+};
+
+void nf_register_queue_handler(struct net *net, const struct nf_queue_handler *qh);
+void nf_unregister_queue_handler(struct net *net);
+void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict);
+
+void nf_queue_entry_get_refs(struct nf_queue_entry *entry);
+void nf_queue_entry_release_refs(struct nf_queue_entry *entry);
+
+static inline void init_hashrandom(u32 *jhash_initval)
+{
+	while (*jhash_initval == 0)
+		*jhash_initval = prandom_u32();
+}
+
+static inline u32 hash_v4(const struct iphdr *iph, u32 initval)
+{
+	/* packets in either direction go into same queue */
+	if ((__force u32)iph->saddr < (__force u32)iph->daddr)
+		return jhash_3words((__force u32)iph->saddr,
+			(__force u32)iph->daddr, iph->protocol, initval);
+
+	return jhash_3words((__force u32)iph->daddr,
+			(__force u32)iph->saddr, iph->protocol, initval);
+}
+
+static inline u32 hash_v6(const struct ipv6hdr *ip6h, u32 initval)
+{
+	u32 a, b, c;
+
+	if ((__force u32)ip6h->saddr.s6_addr32[3] <
+	    (__force u32)ip6h->daddr.s6_addr32[3]) {
+		a = (__force u32) ip6h->saddr.s6_addr32[3];
+		b = (__force u32) ip6h->daddr.s6_addr32[3];
+	} else {
+		b = (__force u32) ip6h->saddr.s6_addr32[3];
+		a = (__force u32) ip6h->daddr.s6_addr32[3];
+	}
+
+	if ((__force u32)ip6h->saddr.s6_addr32[1] <
+	    (__force u32)ip6h->daddr.s6_addr32[1])
+		c = (__force u32) ip6h->saddr.s6_addr32[1];
+	else
+		c = (__force u32) ip6h->daddr.s6_addr32[1];
+
+	return jhash_3words(a, b, c, initval);
+}
+
+static inline u32 hash_bridge(const struct sk_buff *skb, u32 initval)
+{
+	struct ipv6hdr *ip6h, _ip6h;
+	struct iphdr *iph, _iph;
+
+	switch (eth_hdr(skb)->h_proto) {
+	case htons(ETH_P_IP):
+		iph = skb_header_pointer(skb, skb_network_offset(skb),
+					 sizeof(*iph), &_iph);
+		if (iph)
+			return hash_v4(iph, initval);
+		break;
+	case htons(ETH_P_IPV6):
+		ip6h = skb_header_pointer(skb, skb_network_offset(skb),
+					  sizeof(*ip6h), &_ip6h);
+		if (ip6h)
+			return hash_v6(ip6h, initval);
+		break;
+	}
+
+	return 0;
+}
+
+static inline u32
+nfqueue_hash(const struct sk_buff *skb, u16 queue, u16 queues_total, u8 family,
+	     u32 initval)
+{
+	switch (family) {
+	case NFPROTO_IPV4:
+		queue += reciprocal_scale(hash_v4(ip_hdr(skb), initval),
+					  queues_total);
+		break;
+	case NFPROTO_IPV6:
+		queue += reciprocal_scale(hash_v6(ipv6_hdr(skb), initval),
+					  queues_total);
+		break;
+	case NFPROTO_BRIDGE:
+		queue += reciprocal_scale(hash_bridge(skb, initval),
+					  queues_total);
+		break;
+	}
+
+	return queue;
+}
+
+#endif /* _NF_QUEUE_H */

include/net/netfilter/nf_socket.h

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_SOCK_H_
+#define _NF_SOCK_H_
+
+#include <net/sock.h>
+
+struct sock *nf_sk_lookup_slow_v4(struct net *net, const struct sk_buff *skb,
+				  const struct net_device *indev);
+
+struct sock *nf_sk_lookup_slow_v6(struct net *net, const struct sk_buff *skb,
+				  const struct net_device *indev);
+
+#endif

include/net/netfilter/nf_tables_core.h

@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NET_NF_TABLES_CORE_H
+#define _NET_NF_TABLES_CORE_H
+
+#include <net/netfilter/nf_tables.h>
+
+extern struct nft_expr_type nft_imm_type;
+extern struct nft_expr_type nft_cmp_type;
+extern struct nft_expr_type nft_lookup_type;
+extern struct nft_expr_type nft_bitwise_type;
+extern struct nft_expr_type nft_byteorder_type;
+extern struct nft_expr_type nft_payload_type;
+extern struct nft_expr_type nft_dynset_type;
+extern struct nft_expr_type nft_range_type;
+extern struct nft_expr_type nft_meta_type;
+extern struct nft_expr_type nft_rt_type;
+extern struct nft_expr_type nft_exthdr_type;
+
+int nf_tables_core_module_init(void);
+void nf_tables_core_module_exit(void);
+
+struct nft_cmp_fast_expr {
+	u32			data;
+	enum nft_registers	sreg:8;
+	u8			len;
+};
+
+struct nft_immediate_expr {
+	struct nft_data		data;
+	enum nft_registers	dreg:8;
+	u8			dlen;
+};
+
+/* Calculate the mask for the nft_cmp_fast expression. On big endian the
+ * mask needs to include the *upper* bytes when interpreting that data as
+ * something smaller than the full u32, therefore a cpu_to_le32 is done.
+ */
+static inline u32 nft_cmp_fast_mask(unsigned int len)
+{
+	return cpu_to_le32(~0U >> (FIELD_SIZEOF(struct nft_cmp_fast_expr,
+						data) * BITS_PER_BYTE - len));
+}
+
+extern const struct nft_expr_ops nft_cmp_fast_ops;
+
+struct nft_payload {
+	enum nft_payload_bases	base:8;
+	u8			offset;
+	u8			len;
+	enum nft_registers	dreg:8;
+};
+
+struct nft_payload_set {
+	enum nft_payload_bases	base:8;
+	u8			offset;
+	u8			len;
+	enum nft_registers	sreg:8;
+	u8			csum_type;
+	u8			csum_offset;
+	u8			csum_flags;
+};
+
+extern const struct nft_expr_ops nft_payload_fast_ops;
+
+extern struct static_key_false nft_counters_enabled;
+extern struct static_key_false nft_trace_enabled;
+
+extern struct nft_set_type nft_set_rhash_type;
+extern struct nft_set_type nft_set_hash_type;
+extern struct nft_set_type nft_set_hash_fast_type;
+extern struct nft_set_type nft_set_rbtree_type;
+extern struct nft_set_type nft_set_bitmap_type;
+
+struct nft_expr;
+struct nft_regs;
+struct nft_pktinfo;
+void nft_meta_get_eval(const struct nft_expr *expr,
+		       struct nft_regs *regs, const struct nft_pktinfo *pkt);
+void nft_lookup_eval(const struct nft_expr *expr,
+		     struct nft_regs *regs, const struct nft_pktinfo *pkt);
+#endif /* _NET_NF_TABLES_CORE_H */

include/net/netfilter/nf_tables_ipv4.h

@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_TABLES_IPV4_H_
+#define _NF_TABLES_IPV4_H_
+
+#include <net/netfilter/nf_tables.h>
+#include <net/ip.h>
+
+static inline void nft_set_pktinfo_ipv4(struct nft_pktinfo *pkt,
+					struct sk_buff *skb)
+{
+	struct iphdr *ip;
+
+	ip = ip_hdr(pkt->skb);
+	pkt->tprot_set = true;
+	pkt->tprot = ip->protocol;
+	pkt->xt.thoff = ip_hdrlen(pkt->skb);
+	pkt->xt.fragoff = ntohs(ip->frag_off) & IP_OFFSET;
+}
+
+static inline int __nft_set_pktinfo_ipv4_validate(struct nft_pktinfo *pkt,
+						  struct sk_buff *skb)
+{
+	struct iphdr *iph, _iph;
+	u32 len, thoff;
+
+	iph = skb_header_pointer(skb, skb_network_offset(skb), sizeof(*iph),
+				 &_iph);
+	if (!iph)
+		return -1;
+
+	if (iph->ihl < 5 || iph->version != 4)
+		return -1;
+
+	len = ntohs(iph->tot_len);
+	thoff = iph->ihl * 4;
+	if (skb->len < len)
+		return -1;
+	else if (len < thoff)
+		return -1;
+
+	pkt->tprot_set = true;
+	pkt->tprot = iph->protocol;
+	pkt->xt.thoff = thoff;
+	pkt->xt.fragoff = ntohs(iph->frag_off) & IP_OFFSET;
+
+	return 0;
+}
+
+static inline void nft_set_pktinfo_ipv4_validate(struct nft_pktinfo *pkt,
+						 struct sk_buff *skb)
+{
+	if (__nft_set_pktinfo_ipv4_validate(pkt, skb) < 0)
+		nft_set_pktinfo_unspec(pkt, skb);
+}
+
+#endif

include/net/netfilter/nf_tables_ipv6.h

@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NF_TABLES_IPV6_H_
+#define _NF_TABLES_IPV6_H_
+
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <net/ipv6.h>
+
+static inline void nft_set_pktinfo_ipv6(struct nft_pktinfo *pkt,
+					struct sk_buff *skb)
+{
+	unsigned int flags = IP6_FH_F_AUTH;
+	int protohdr, thoff = 0;
+	unsigned short frag_off;
+
+	protohdr = ipv6_find_hdr(pkt->skb, &thoff, -1, &frag_off, &flags);
+	if (protohdr < 0) {
+		nft_set_pktinfo_unspec(pkt, skb);
+		return;
+	}
+
+	pkt->tprot_set = true;
+	pkt->tprot = protohdr;
+	pkt->xt.thoff = thoff;
+	pkt->xt.fragoff = frag_off;
+}
+
+static inline int __nft_set_pktinfo_ipv6_validate(struct nft_pktinfo *pkt,
+						  struct sk_buff *skb)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+	unsigned int flags = IP6_FH_F_AUTH;
+	struct ipv6hdr *ip6h, _ip6h;
+	unsigned int thoff = 0;
+	unsigned short frag_off;
+	int protohdr;
+	u32 pkt_len;
+
+	ip6h = skb_header_pointer(skb, skb_network_offset(skb), sizeof(*ip6h),
+				  &_ip6h);
+	if (!ip6h)
+		return -1;
+
+	if (ip6h->version != 6)
+		return -1;
+
+	pkt_len = ntohs(ip6h->payload_len);
+	if (pkt_len + sizeof(*ip6h) > skb->len)
+		return -1;
+
+	protohdr = ipv6_find_hdr(pkt->skb, &thoff, -1, &frag_off, &flags);
+	if (protohdr < 0)
+		return -1;
+
+	pkt->tprot_set = true;
+	pkt->tprot = protohdr;
+	pkt->xt.thoff = thoff;
+	pkt->xt.fragoff = frag_off;
+
+	return 0;
+#else
+	return -1;
+#endif
+}
+
+static inline void nft_set_pktinfo_ipv6_validate(struct nft_pktinfo *pkt,
+						 struct sk_buff *skb)
+{
+	if (__nft_set_pktinfo_ipv6_validate(pkt, skb) < 0)
+		nft_set_pktinfo_unspec(pkt, skb);
+}
+
+#endif

include/net/netfilter/nf_tproxy.h

@@ -0,0 +1,121 @@
+#ifndef _NF_TPROXY_H_
+#define _NF_TPROXY_H_
+
+#include <net/tcp.h>
+
+enum nf_tproxy_lookup_t {
+	 NF_TPROXY_LOOKUP_LISTENER,
+	 NF_TPROXY_LOOKUP_ESTABLISHED,
+};
+
+static inline bool nf_tproxy_sk_is_transparent(struct sock *sk)
+{
+	if (inet_sk_transparent(sk))
+		return true;
+
+	sock_gen_put(sk);
+	return false;
+}
+
+/* assign a socket to the skb -- consumes sk */
+static inline void nf_tproxy_assign_sock(struct sk_buff *skb, struct sock *sk)
+{
+	skb_orphan(skb);
+	skb->sk = sk;
+	skb->destructor = sock_edemux;
+}
+
+__be32 nf_tproxy_laddr4(struct sk_buff *skb, __be32 user_laddr, __be32 daddr);
+
+/**
+ * nf_tproxy_handle_time_wait4 - handle IPv4 TCP TIME_WAIT reopen redirections
+ * @skb:	The skb being processed.
+ * @laddr:	IPv4 address to redirect to or zero.
+ * @lport:	TCP port to redirect to or zero.
+ * @sk:		The TIME_WAIT TCP socket found by the lookup.
+ *
+ * We have to handle SYN packets arriving to TIME_WAIT sockets
+ * differently: instead of reopening the connection we should rather
+ * redirect the new connection to the proxy if there's a listener
+ * socket present.
+ *
+ * nf_tproxy_handle_time_wait4() consumes the socket reference passed in.
+ *
+ * Returns the listener socket if there's one, the TIME_WAIT socket if
+ * no such listener is found, or NULL if the TCP header is incomplete.
+ */
+struct sock *
+nf_tproxy_handle_time_wait4(struct net *net, struct sk_buff *skb,
+			    __be32 laddr, __be16 lport, struct sock *sk);
+
+/*
+ * This is used when the user wants to intercept a connection matching
+ * an explicit iptables rule. In this case the sockets are assumed
+ * matching in preference order:
+ *
+ *   - match: if there's a fully established connection matching the
+ *     _packet_ tuple, it is returned, assuming the redirection
+ *     already took place and we process a packet belonging to an
+ *     established connection
+ *
+ *   - match: if there's a listening socket matching the redirection
+ *     (e.g. on-port & on-ip of the connection), it is returned,
+ *     regardless if it was bound to 0.0.0.0 or an explicit
+ *     address. The reasoning is that if there's an explicit rule, it
+ *     does not really matter if the listener is bound to an interface
+ *     or to 0. The user already stated that he wants redirection
+ *     (since he added the rule).
+ *
+ * Please note that there's an overlap between what a TPROXY target
+ * and a socket match will match. Normally if you have both rules the
+ * "socket" match will be the first one, effectively all packets
+ * belonging to established connections going through that one.
+ */
+struct sock *
+nf_tproxy_get_sock_v4(struct net *net, struct sk_buff *skb,
+		      const u8 protocol,
+		      const __be32 saddr, const __be32 daddr,
+		      const __be16 sport, const __be16 dport,
+		      const struct net_device *in,
+		      const enum nf_tproxy_lookup_t lookup_type);
+
+const struct in6_addr *
+nf_tproxy_laddr6(struct sk_buff *skb, const struct in6_addr *user_laddr,
+		 const struct in6_addr *daddr);
+
+/**
+ * nf_tproxy_handle_time_wait6 - handle IPv6 TCP TIME_WAIT reopen redirections
+ * @skb:	The skb being processed.
+ * @tproto:	Transport protocol.
+ * @thoff:	Transport protocol header offset.
+ * @net:	Network namespace.
+ * @laddr:	IPv6 address to redirect to.
+ * @lport:	TCP port to redirect to or zero.
+ * @sk:		The TIME_WAIT TCP socket found by the lookup.
+ *
+ * We have to handle SYN packets arriving to TIME_WAIT sockets
+ * differently: instead of reopening the connection we should rather
+ * redirect the new connection to the proxy if there's a listener
+ * socket present.
+ *
+ * nf_tproxy_handle_time_wait6() consumes the socket reference passed in.
+ *
+ * Returns the listener socket if there's one, the TIME_WAIT socket if
+ * no such listener is found, or NULL if the TCP header is incomplete.
+ */
+struct sock *
+nf_tproxy_handle_time_wait6(struct sk_buff *skb, int tproto, int thoff,
+			    struct net *net,
+			    const struct in6_addr *laddr,
+			    const __be16 lport,
+			    struct sock *sk);
+
+struct sock *
+nf_tproxy_get_sock_v6(struct net *net, struct sk_buff *skb, int thoff,
+		      const u8 protocol,
+		      const struct in6_addr *saddr, const struct in6_addr *daddr,
+		      const __be16 sport, const __be16 dport,
+		      const struct net_device *in,
+		      const enum nf_tproxy_lookup_t lookup_type);
+
+#endif /* _NF_TPROXY_H_ */

include/net/netfilter/nfnetlink_log.h

@@ -0,0 +1 @@
+/* SPDX-License-Identifier: GPL-2.0 */

include/net/netfilter/nft_fib.h

@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NFT_FIB_H_
+#define _NFT_FIB_H_
+
+struct nft_fib {
+	enum nft_registers	dreg:8;
+	u8			result;
+	u32			flags;
+};
+
+extern const struct nla_policy nft_fib_policy[];
+
+static inline bool
+nft_fib_is_loopback(const struct sk_buff *skb, const struct net_device *in)
+{
+	return skb->pkt_type == PACKET_LOOPBACK || in->flags & IFF_LOOPBACK;
+}
+
+int nft_fib_dump(struct sk_buff *skb, const struct nft_expr *expr);
+int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
+		 const struct nlattr * const tb[]);
+int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
+		     const struct nft_data **data);
+
+
+void nft_fib4_eval_type(const struct nft_expr *expr, struct nft_regs *regs,
+			const struct nft_pktinfo *pkt);
+void nft_fib4_eval(const struct nft_expr *expr, struct nft_regs *regs,
+		   const struct nft_pktinfo *pkt);
+
+void nft_fib6_eval_type(const struct nft_expr *expr, struct nft_regs *regs,
+			const struct nft_pktinfo *pkt);
+void nft_fib6_eval(const struct nft_expr *expr, struct nft_regs *regs,
+		   const struct nft_pktinfo *pkt);
+
+void nft_fib_store_result(void *reg, const struct nft_fib *priv,
+			  const struct nft_pktinfo *pkt, int index);
+#endif

include/net/netfilter/nft_masq.h

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NFT_MASQ_H_
+#define _NFT_MASQ_H_
+
+struct nft_masq {
+	u32			flags;
+	enum nft_registers      sreg_proto_min:8;
+	enum nft_registers      sreg_proto_max:8;
+};
+
+extern const struct nla_policy nft_masq_policy[];
+
+int nft_masq_init(const struct nft_ctx *ctx,
+		  const struct nft_expr *expr,
+		  const struct nlattr * const tb[]);
+
+int nft_masq_dump(struct sk_buff *skb, const struct nft_expr *expr);
+
+int nft_masq_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
+		      const struct nft_data **data);
+
+#endif /* _NFT_MASQ_H_ */

include/net/netfilter/nft_redir.h

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NFT_REDIR_H_
+#define _NFT_REDIR_H_
+
+struct nft_redir {
+	enum nft_registers	sreg_proto_min:8;
+	enum nft_registers	sreg_proto_max:8;
+	u16			flags;
+};
+
+extern const struct nla_policy nft_redir_policy[];
+
+int nft_redir_init(const struct nft_ctx *ctx,
+		   const struct nft_expr *expr,
+		   const struct nlattr * const tb[]);
+
+int nft_redir_dump(struct sk_buff *skb, const struct nft_expr *expr);
+
+int nft_redir_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
+		       const struct nft_data **data);
+
+#endif /* _NFT_REDIR_H_ */

include/net/netfilter/nft_reject.h

@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NFT_REJECT_H_
+#define _NFT_REJECT_H_
+
+struct nft_reject {
+	enum nft_reject_types	type:8;
+	u8			icmp_code;
+};
+
+extern const struct nla_policy nft_reject_policy[];
+
+int nft_reject_validate(const struct nft_ctx *ctx,
+			const struct nft_expr *expr,
+			const struct nft_data **data);
+
+int nft_reject_init(const struct nft_ctx *ctx,
+		    const struct nft_expr *expr,
+		    const struct nlattr * const tb[]);
+
+int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr);
+
+int nft_reject_icmp_code(u8 code);
+int nft_reject_icmpv6_code(u8 code);
+
+#endif

include/net/netfilter/xt_rateest.h

@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _XT_RATEEST_H
+#define _XT_RATEEST_H
+
+#include <net/gen_stats.h>
+
+struct xt_rateest {
+	/* keep lock and bstats on same cache line to speedup xt_rateest_tg() */
+	struct gnet_stats_basic_packed	bstats;
+	spinlock_t			lock;
+
+
+	/* following fields not accessed in hot path */
+	unsigned int			refcnt;
+	struct hlist_node		list;
+	char				name[IFNAMSIZ];
+	struct gnet_estimator		params;
+	struct rcu_head			rcu;
+
+	/* keep this field far away to speedup xt_rateest_mt() */
+	struct net_rate_estimator __rcu *rate_est;
+};
+
+struct xt_rateest *xt_rateest_lookup(struct net *net, const char *name);
+void xt_rateest_put(struct net *net, struct xt_rateest *est);
+
+#endif /* _XT_RATEEST_H */