fix x

root/target/linux/generic/hack-5.4/601-netfilter-export-udp_get_timeouts-function.patch

@@ -0,0 +1,34 @@
+From ba041eb8000e4a8f556ca641335894f7e7429dbb Mon Sep 17 00:00:00 2001
+From: Ailick <277498654@qq.com>
+Date: Sat, 21 Aug 2021 17:12:22 +0800
+Subject: [PATCH] net: patch linux kernel to support shortcut-fe-cm
+
+---
+ nf_conntrack_proto_udp.c | 3 ++-
+ nf_conntrack_timeout.h | 2 +
+ 1 file changed, 2 insertion(+)
+
+--- a/include/net/netfilter/nf_conntrack_timeout.h
++++ b/include/net/netfilter/nf_conntrack_timeout.h
+@@ -124,4 +124,6 @@ extern struct nf_ct_timeout *(*nf_ct_tim
+ extern void (*nf_ct_timeout_put_hook)(struct nf_ct_timeout *timeout);
+ #endif
+ 
++extern unsigned int *udp_get_timeouts(struct net *net);
++
+ #endif /* _NF_CONNTRACK_TIMEOUT_H */
+--- a/net/netfilter/nf_conntrack_proto_udp.c
++++ b/net/netfilter/nf_conntrack_proto_udp.c
+@@ -29,10 +29,11 @@ static const unsigned int udp_timeouts[U
+ 	[UDP_CT_REPLIED]	= 120*HZ,
+ };
+ 
+-static unsigned int *udp_get_timeouts(struct net *net)
++unsigned int *udp_get_timeouts(struct net *net)
+ {
+ 	return nf_udp_pernet(net)->timeouts;
+ }
++EXPORT_SYMBOL(udp_get_timeouts);
+ 
+ static void udp_error_log(const struct sk_buff *skb,
+ 			  const struct nf_hook_state *state,

root/target/linux/generic/hack-5.4/645-netfilter-connmark-introduce-set-dscpmark.patch

@@ -0,0 +1,212 @@
+From eda40b8c8c82e0f2789d6bc8bf63846dce2e8f32 Mon Sep 17 00:00:00 2001
+From: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
+Date: Sat, 23 Mar 2019 09:29:49 +0000
+Subject: [PATCH] netfilter: connmark: introduce set-dscpmark
+
+set-dscpmark is a method of storing the DSCP of an ip packet into
+conntrack mark.  In combination with a suitable tc filter action
+(act_ctinfo) DSCP values are able to be stored in the mark on egress and
+restored on ingress across links that otherwise alter or bleach DSCP.
+
+This is useful for qdiscs such as CAKE which are able to shape according
+to policies based on DSCP.
+
+Ingress classification is traditionally a challenging task since
+iptables rules haven't yet run and tc filter/eBPF programs are pre-NAT
+lookups, hence are unable to see internal IPv4 addresses as used on the
+typical home masquerading gateway.
+
+x_tables CONNMARK set-dscpmark target solves the problem of storing the
+DSCP to the conntrack mark in a way suitable for the new act_ctinfo tc
+action to restore.
+
+The set-dscpmark option accepts 2 parameters, a 32bit 'dscpmask' and a
+32bit 'statemask'.  The dscp mask must be 6 contiguous bits and
+represents the area where the DSCP will be stored in the connmark.  The
+state mask is a minimum 1 bit length mask that must not overlap with the
+dscpmask.  It represents a flag which is set when the DSCP has been
+stored in the conntrack mark. This is useful to implement a 'one shot'
+iptables based classification where the 'complicated' iptables rules are
+only run once to classify the connection on initial (egress) packet and
+subsequent packets are all marked/restored with the same DSCP.  A state
+mask of zero disables the setting of a status bit/s.
+
+example syntax with a suitably modified iptables user space application:
+
+iptables -A QOS_MARK_eth0 -t mangle -j CONNMARK --set-dscpmark 0xfc000000/0x01000000
+
+Would store the DSCP in the top 6 bits of the 32bit mark field, and use
+the LSB of the top byte as the 'DSCP has been stored' marker.
+
+|----0xFC----conntrack mark----000000---|
+| Bits 31-26 | bit 25 | bit24 |~~~ Bit 0|
+| DSCP       | unused | flag  |unused   |
+|-----------------------0x01---000000---|
+      ^                   ^
+      |                   |
+      ---|             Conditional flag
+         |             set this when dscp
+|-ip diffserv-|        stored in mark
+| 6 bits      |
+|-------------|
+
+an identically configured tc action to restore looks like:
+
+tc filter show dev eth0 ingress
+filter parent ffff: protocol all pref 10 u32 chain 0
+filter parent ffff: protocol all pref 10 u32 chain 0 fh 800: ht divisor 1
+filter parent ffff: protocol all pref 10 u32 chain 0 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1: not_in_hw
+  match 00000000/00000000 at 0
+	action order 1: ctinfo zone 0 pipe
+	 index 2 ref 1 bind 1 dscp 0xfc000000/0x1000000
+
+	action order 2: mirred (Egress Redirect to device ifb4eth0) stolen
+	index 1 ref 1 bind 1
+
+|----0xFC----conntrack mark----000000---|
+| Bits 31-26 | bit 25 | bit24 |~~~ Bit 0|
+| DSCP       | unused | flag  |unused   |
+|-----------------------0x01---000000---|
+      |                   |
+      |                   |
+      ---|             Conditional flag
+         v             only restore if set
+|-ip diffserv-|
+| 6 bits      |
+|-------------|
+
+Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
+---
+ include/uapi/linux/netfilter/xt_connmark.h | 10 ++++
+ net/netfilter/xt_connmark.c                | 55 ++++++++++++++++++----
+ 2 files changed, 57 insertions(+), 8 deletions(-)
+
+--- a/include/uapi/linux/netfilter/xt_connmark.h
++++ b/include/uapi/linux/netfilter/xt_connmark.h
+@@ -20,6 +20,11 @@ enum {
+ };
+ 
+ enum {
++	XT_CONNMARK_VALUE =	(1 << 0),
++	XT_CONNMARK_DSCP = 	(1 << 1)
++};
++
++enum {
+ 	D_SHIFT_LEFT = 0,
+ 	D_SHIFT_RIGHT,
+ };
+@@ -34,6 +39,11 @@ struct xt_connmark_tginfo2 {
+ 	__u8 shift_dir, shift_bits, mode;
+ };
+ 
++struct xt_connmark_tginfo3 {
++	__u32 ctmark, ctmask, nfmask;
++	__u8 shift_dir, shift_bits, mode, func;
++};
++
+ struct xt_connmark_mtinfo1 {
+ 	__u32 mark, mask;
+ 	__u8 invert;
+--- a/net/netfilter/xt_connmark.c
++++ b/net/netfilter/xt_connmark.c
+@@ -24,12 +24,13 @@ MODULE_ALIAS("ipt_connmark");
+ MODULE_ALIAS("ip6t_connmark");
+ 
+ static unsigned int
+-connmark_tg_shift(struct sk_buff *skb, const struct xt_connmark_tginfo2 *info)
++connmark_tg_shift(struct sk_buff *skb, const struct xt_connmark_tginfo3 *info)
+ {
+ 	enum ip_conntrack_info ctinfo;
+ 	u_int32_t new_targetmark;
+ 	struct nf_conn *ct;
+ 	u_int32_t newmark;
++	u_int8_t dscp;
+ 
+ 	ct = nf_ct_get(skb, &ctinfo);
+ 	if (ct == NULL)
+@@ -37,12 +38,24 @@ connmark_tg_shift(struct sk_buff *skb, c
+ 
+ 	switch (info->mode) {
+ 	case XT_CONNMARK_SET:
+-		newmark = (ct->mark & ~info->ctmask) ^ info->ctmark;
+-		if (info->shift_dir == D_SHIFT_RIGHT)
+-			newmark >>= info->shift_bits;
+-		else
+-			newmark <<= info->shift_bits;
++		newmark = ct->mark;
++		if (info->func & XT_CONNMARK_VALUE) {
++			newmark = (newmark & ~info->ctmask) ^ info->ctmark;
++			if (info->shift_dir == D_SHIFT_RIGHT)
++				newmark >>= info->shift_bits;
++			else
++				newmark <<= info->shift_bits;
++		} else if (info->func & XT_CONNMARK_DSCP) {
++			if (skb->protocol == htons(ETH_P_IP))
++				dscp = ipv4_get_dsfield(ip_hdr(skb)) >> 2;
++			else if (skb->protocol == htons(ETH_P_IPV6))
++				dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2;
++			else	/* protocol doesn't have diffserv */
++				break;
+ 
++			newmark = (newmark & ~info->ctmark) |
++				  (info->ctmask | (dscp << info->shift_bits));
++		}
+ 		if (ct->mark != newmark) {
+ 			ct->mark = newmark;
+ 			nf_conntrack_event_cache(IPCT_MARK, ct);
+@@ -81,20 +94,36 @@ static unsigned int
+ connmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
+ {
+ 	const struct xt_connmark_tginfo1 *info = par->targinfo;
+-	const struct xt_connmark_tginfo2 info2 = {
++	const struct xt_connmark_tginfo3 info3 = {
+ 		.ctmark	= info->ctmark,
+ 		.ctmask	= info->ctmask,
+ 		.nfmask	= info->nfmask,
+ 		.mode	= info->mode,
++		.func	= XT_CONNMARK_VALUE
+ 	};
+ 
+-	return connmark_tg_shift(skb, &info2);
++	return connmark_tg_shift(skb, &info3);
+ }
+ 
+ static unsigned int
+ connmark_tg_v2(struct sk_buff *skb, const struct xt_action_param *par)
+ {
+ 	const struct xt_connmark_tginfo2 *info = par->targinfo;
++	const struct xt_connmark_tginfo3 info3 = {
++		.ctmark	= info->ctmark,
++		.ctmask	= info->ctmask,
++		.nfmask	= info->nfmask,
++		.mode	= info->mode,
++		.func	= XT_CONNMARK_VALUE
++	};
++
++	return connmark_tg_shift(skb, &info3);
++}
++
++static unsigned int
++connmark_tg_v3(struct sk_buff *skb, const struct xt_action_param *par)
++{
++	const struct xt_connmark_tginfo3 *info = par->targinfo;
+ 
+ 	return connmark_tg_shift(skb, info);
+ }
+@@ -165,6 +194,16 @@ static struct xt_target connmark_tg_reg[
+ 		.targetsize     = sizeof(struct xt_connmark_tginfo2),
+ 		.destroy        = connmark_tg_destroy,
+ 		.me             = THIS_MODULE,
++	},
++	{
++		.name           = "CONNMARK",
++		.revision       = 3,
++		.family         = NFPROTO_UNSPEC,
++		.checkentry     = connmark_tg_check,
++		.target         = connmark_tg_v3,
++		.targetsize     = sizeof(struct xt_connmark_tginfo3),
++		.destroy        = connmark_tg_destroy,
++		.me             = THIS_MODULE,
+ 	}
+ };
+ 

root/target/linux/generic/hack-5.4/647-netfilter-flow-acct.patch

@@ -0,0 +1,70 @@
+--- a/include/net/netfilter/nf_flow_table.h
++++ b/include/net/netfilter/nf_flow_table.h
+@@ -163,6 +163,8 @@ struct nf_flow_table_hw {
+ int nf_flow_table_hw_register(const struct nf_flow_table_hw *offload);
+ void nf_flow_table_hw_unregister(const struct nf_flow_table_hw *offload);
+ 
++void nf_flow_table_acct(struct flow_offload *flow, struct sk_buff *skb, int dir);
++
+ extern struct work_struct nf_flow_offload_hw_work;
+ 
+ #define MODULE_ALIAS_NF_FLOWTABLE(family)	\
+--- a/net/netfilter/nf_flow_table_core.c
++++ b/net/netfilter/nf_flow_table_core.c
+@@ -13,6 +13,7 @@
+ #include <net/netfilter/nf_conntrack_core.h>
+ #include <net/netfilter/nf_conntrack_l4proto.h>
+ #include <net/netfilter/nf_conntrack_tuple.h>
++#include <net/netfilter/nf_conntrack_acct.h>
+ 
+ struct flow_offload_entry {
+ 	struct flow_offload	flow;
+@@ -177,6 +178,22 @@ void flow_offload_free(struct flow_offlo
+ }
+ EXPORT_SYMBOL_GPL(flow_offload_free);
+ 
++void nf_flow_table_acct(struct flow_offload *flow, struct sk_buff *skb, int dir)
++{
++	struct flow_offload_entry *entry;
++	struct nf_conn_acct *acct;
++
++	entry = container_of(flow, struct flow_offload_entry, flow);
++	acct = nf_conn_acct_find(entry->ct);
++	if (acct) {
++		struct nf_conn_counter *counter = acct->counter;
++
++		atomic64_inc(&counter[dir].packets);
++		atomic64_add(skb->len, &counter[dir].bytes);
++	}
++}
++EXPORT_SYMBOL_GPL(nf_flow_table_acct);
++
+ static u32 flow_offload_hash(const void *data, u32 len, u32 seed)
+ {
+ 	const struct flow_offload_tuple *tuple = data;
+--- a/net/netfilter/nf_flow_table_ip.c
++++ b/net/netfilter/nf_flow_table_ip.c
+@@ -12,6 +12,7 @@
+ #include <net/ip6_route.h>
+ #include <net/neighbour.h>
+ #include <net/netfilter/nf_flow_table.h>
++
+ /* For layer 4 checksum field offset. */
+ #include <linux/tcp.h>
+ #include <linux/udp.h>
+@@ -288,6 +289,7 @@ nf_flow_offload_ip_hook(void *priv, stru
+ 	skb->dev = outdev;
+ 	nexthop = rt_nexthop(rt, flow->tuplehash[!dir].tuple.src_v4.s_addr);
+ 	skb_dst_set_noref(skb, &rt->dst);
++	nf_flow_table_acct(flow, skb, dir);
+ 	neigh_xmit(NEIGH_ARP_TABLE, outdev, &nexthop, skb);
+ 
+ 	return NF_STOLEN;
+@@ -518,6 +520,7 @@ nf_flow_offload_ipv6_hook(void *priv, st
+ 	skb->dev = outdev;
+ 	nexthop = rt6_nexthop(rt, &flow->tuplehash[!dir].tuple.src_v6);
+ 	skb_dst_set_noref(skb, &rt->dst);
++	nf_flow_table_acct(flow, skb, dir);
+ 	neigh_xmit(NEIGH_ND_TABLE, outdev, nexthop, skb);
+ 
+ 	return NF_STOLEN;

root/target/linux/generic/hack-5.4/650-netfilter-add-xt_OFFLOAD-target.patch

@@ -0,0 +1,589 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Tue, 20 Feb 2018 15:56:02 +0100
+Subject: [PATCH] netfilter: add xt_OFFLOAD target
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+ create mode 100644 net/netfilter/xt_OFFLOAD.c
+
+--- a/net/ipv4/netfilter/Kconfig
++++ b/net/ipv4/netfilter/Kconfig
+@@ -56,8 +56,6 @@ config NF_TABLES_ARP
+ 	help
+ 	  This option enables the ARP support for nf_tables.
+ 
+-endif # NF_TABLES
+-
+ config NF_FLOW_TABLE_IPV4
+ 	tristate "Netfilter flow table IPv4 module"
+ 	depends on NF_FLOW_TABLE
+@@ -66,6 +64,8 @@ config NF_FLOW_TABLE_IPV4
+ 
+ 	  To compile it as a module, choose M here.
+ 
++endif # NF_TABLES
++
+ config NF_DUP_IPV4
+ 	tristate "Netfilter IPv4 packet duplication to alternate destination"
+ 	depends on !NF_CONNTRACK || NF_CONNTRACK
+--- a/net/ipv6/netfilter/Kconfig
++++ b/net/ipv6/netfilter/Kconfig
+@@ -45,7 +45,6 @@ config NFT_FIB_IPV6
+ 	  multicast or blackhole.
+ 
+ endif # NF_TABLES_IPV6
+-endif # NF_TABLES
+ 
+ config NF_FLOW_TABLE_IPV6
+ 	tristate "Netfilter flow table IPv6 module"
+@@ -55,6 +54,8 @@ config NF_FLOW_TABLE_IPV6
+ 
+ 	  To compile it as a module, choose M here.
+ 
++endif # NF_TABLES
++
+ config NF_DUP_IPV6
+ 	tristate "Netfilter IPv6 packet duplication to alternate destination"
+ 	depends on !NF_CONNTRACK || NF_CONNTRACK
+--- a/net/netfilter/Kconfig
++++ b/net/netfilter/Kconfig
+@@ -689,8 +689,6 @@ config NFT_FIB_NETDEV
+ 
+ endif # NF_TABLES_NETDEV
+ 
+-endif # NF_TABLES
+-
+ config NF_FLOW_TABLE_INET
+ 	tristate "Netfilter flow table mixed IPv4/IPv6 module"
+ 	depends on NF_FLOW_TABLE
+@@ -699,11 +697,12 @@ config NF_FLOW_TABLE_INET
+ 
+ 	  To compile it as a module, choose M here.
+ 
++endif # NF_TABLES
++
+ config NF_FLOW_TABLE
+ 	tristate "Netfilter flow table module"
+ 	depends on NETFILTER_INGRESS
+ 	depends on NF_CONNTRACK
+-	depends on NF_TABLES
+ 	help
+ 	  This option adds the flow table core infrastructure.
+ 
+@@ -992,6 +991,15 @@ config NETFILTER_XT_TARGET_NOTRACK
+ 	depends on NETFILTER_ADVANCED
+ 	select NETFILTER_XT_TARGET_CT
+ 
++config NETFILTER_XT_TARGET_FLOWOFFLOAD
++	tristate '"FLOWOFFLOAD" target support'
++	depends on NF_FLOW_TABLE
++	depends on NETFILTER_INGRESS
++	help
++	  This option adds a `FLOWOFFLOAD' target, which uses the nf_flow_offload
++	  module to speed up processing of packets by bypassing the usual
++	  netfilter chains
++
+ config NETFILTER_XT_TARGET_RATEEST
+ 	tristate '"RATEEST" target support'
+ 	depends on NETFILTER_ADVANCED
+--- a/net/netfilter/Makefile
++++ b/net/netfilter/Makefile
+@@ -141,6 +141,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_CLASSIF
+ obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSECMARK) += xt_CONNSECMARK.o
+ obj-$(CONFIG_NETFILTER_XT_TARGET_CT) += xt_CT.o
+ obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o
++obj-$(CONFIG_NETFILTER_XT_TARGET_FLOWOFFLOAD) += xt_FLOWOFFLOAD.o
+ obj-$(CONFIG_NETFILTER_XT_TARGET_HL) += xt_HL.o
+ obj-$(CONFIG_NETFILTER_XT_TARGET_HMARK) += xt_HMARK.o
+ obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o
+--- /dev/null
++++ b/net/netfilter/xt_FLOWOFFLOAD.c
+@@ -0,0 +1,427 @@
++/*
++ * Copyright (C) 2018 Felix Fietkau <nbd@nbd.name>
++ *
++ * 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.
++ */
++#include <linux/module.h>
++#include <linux/init.h>
++#include <linux/netfilter.h>
++#include <linux/netfilter/xt_FLOWOFFLOAD.h>
++#include <net/ip.h>
++#include <net/netfilter/nf_conntrack.h>
++#include <net/netfilter/nf_conntrack_extend.h>
++#include <net/netfilter/nf_conntrack_helper.h>
++#include <net/netfilter/nf_flow_table.h>
++
++static struct nf_flowtable nf_flowtable;
++static HLIST_HEAD(hooks);
++static DEFINE_SPINLOCK(hooks_lock);
++static struct delayed_work hook_work;
++
++struct xt_flowoffload_hook {
++	struct hlist_node list;
++	struct nf_hook_ops ops;
++	struct net *net;
++	bool registered;
++	bool used;
++};
++
++static unsigned int
++xt_flowoffload_net_hook(void *priv, struct sk_buff *skb,
++			  const struct nf_hook_state *state)
++{
++	switch (skb->protocol) {
++	case htons(ETH_P_IP):
++		return nf_flow_offload_ip_hook(priv, skb, state);
++	case htons(ETH_P_IPV6):
++		return nf_flow_offload_ipv6_hook(priv, skb, state);
++	}
++
++	return NF_ACCEPT;
++}
++
++int nf_flow_table_iterate(struct nf_flowtable *flow_table,
++			   void (*iter)(struct flow_offload *flow, void *data),
++			   void *data);
++
++static int
++xt_flowoffload_create_hook(struct net_device *dev)
++{
++	struct xt_flowoffload_hook *hook;
++	struct nf_hook_ops *ops;
++
++	hook = kzalloc(sizeof(*hook), GFP_ATOMIC);
++	if (!hook)
++		return -ENOMEM;
++
++	ops = &hook->ops;
++	ops->pf = NFPROTO_NETDEV;
++	ops->hooknum = NF_NETDEV_INGRESS;
++	ops->priority = 10;
++	ops->priv = &nf_flowtable;
++	ops->hook = xt_flowoffload_net_hook;
++	ops->dev = dev;
++
++	hlist_add_head(&hook->list, &hooks);
++	mod_delayed_work(system_power_efficient_wq, &hook_work, 0);
++
++	return 0;
++}
++
++static struct xt_flowoffload_hook *
++flow_offload_lookup_hook(struct net_device *dev)
++{
++	struct xt_flowoffload_hook *hook;
++
++	hlist_for_each_entry(hook, &hooks, list) {
++		if (hook->ops.dev == dev)
++			return hook;
++	}
++
++	return NULL;
++}
++
++static void
++xt_flowoffload_check_device(struct net_device *dev)
++{
++	struct xt_flowoffload_hook *hook;
++
++	spin_lock_bh(&hooks_lock);
++	hook = flow_offload_lookup_hook(dev);
++	if (hook)
++		hook->used = true;
++	else
++		xt_flowoffload_create_hook(dev);
++	spin_unlock_bh(&hooks_lock);
++}
++
++static void
++xt_flowoffload_register_hooks(void)
++{
++	struct xt_flowoffload_hook *hook;
++
++restart:
++	hlist_for_each_entry(hook, &hooks, list) {
++		if (hook->registered)
++			continue;
++
++		hook->registered = true;
++		hook->net = dev_net(hook->ops.dev);
++		spin_unlock_bh(&hooks_lock);
++		nf_register_net_hook(hook->net, &hook->ops);
++		spin_lock_bh(&hooks_lock);
++		goto restart;
++	}
++
++}
++
++static void
++xt_flowoffload_cleanup_hooks(void)
++{
++	struct xt_flowoffload_hook *hook;
++
++restart:
++	hlist_for_each_entry(hook, &hooks, list) {
++		if (hook->used || !hook->registered)
++			continue;
++
++		hlist_del(&hook->list);
++		spin_unlock_bh(&hooks_lock);
++		nf_unregister_net_hook(hook->net, &hook->ops);
++		kfree(hook);
++		spin_lock_bh(&hooks_lock);
++		goto restart;
++	}
++
++}
++
++static void
++xt_flowoffload_check_hook(struct flow_offload *flow, void *data)
++{
++	struct flow_offload_tuple *tuple = &flow->tuplehash[0].tuple;
++	struct xt_flowoffload_hook *hook;
++	bool *found = data;
++	struct rtable *rt = (struct rtable *)tuple->dst_cache;
++
++	spin_lock_bh(&hooks_lock);
++	hlist_for_each_entry(hook, &hooks, list) {
++		if (hook->ops.dev->ifindex != tuple->iifidx &&
++		    hook->ops.dev->ifindex != rt->dst.dev->ifindex)
++			continue;
++
++		hook->used = true;
++		*found = true;
++	}
++	spin_unlock_bh(&hooks_lock);
++}
++
++static void
++xt_flowoffload_hook_work(struct work_struct *work)
++{
++	struct xt_flowoffload_hook *hook;
++	bool found = false;
++	int err;
++
++	spin_lock_bh(&hooks_lock);
++	xt_flowoffload_register_hooks();
++	hlist_for_each_entry(hook, &hooks, list)
++		hook->used = false;
++	spin_unlock_bh(&hooks_lock);
++
++	err = nf_flow_table_iterate(&nf_flowtable, xt_flowoffload_check_hook,
++				    &found);
++	if (err && err != -EAGAIN)
++	    goto out;
++
++	spin_lock_bh(&hooks_lock);
++	xt_flowoffload_cleanup_hooks();
++	spin_unlock_bh(&hooks_lock);
++
++out:
++	if (found)
++		queue_delayed_work(system_power_efficient_wq, &hook_work, HZ);
++}
++
++static bool
++xt_flowoffload_skip(struct sk_buff *skb, int family)
++{
++	if (skb_sec_path(skb))
++		return true;
++
++	if (family == NFPROTO_IPV4) {
++		const struct ip_options *opt = &(IPCB(skb)->opt);
++
++		if (unlikely(opt->optlen))
++			return true;
++	}
++
++	return false;
++}
++
++static struct dst_entry *
++xt_flowoffload_dst(const struct nf_conn *ct, enum ip_conntrack_dir dir,
++		   const struct xt_action_param *par, int ifindex)
++{
++	struct dst_entry *dst = NULL;
++	struct flowi fl;
++
++	memset(&fl, 0, sizeof(fl));
++	switch (xt_family(par)) {
++	case NFPROTO_IPV4:
++		fl.u.ip4.daddr = ct->tuplehash[dir].tuple.src.u3.ip;
++		fl.u.ip4.flowi4_oif = ifindex;
++		break;
++	case NFPROTO_IPV6:
++		fl.u.ip6.saddr = ct->tuplehash[dir].tuple.dst.u3.in6;
++		fl.u.ip6.daddr = ct->tuplehash[dir].tuple.src.u3.in6;
++		fl.u.ip6.flowi6_oif = ifindex;
++		break;
++	}
++
++	nf_route(xt_net(par), &dst, &fl, false, xt_family(par));
++
++	return dst;
++}
++
++static int
++xt_flowoffload_route(struct sk_buff *skb, const struct nf_conn *ct,
++		   const struct xt_action_param *par,
++		   struct nf_flow_route *route, enum ip_conntrack_dir dir)
++{
++	struct dst_entry *this_dst, *other_dst;
++
++	this_dst = xt_flowoffload_dst(ct, !dir, par, xt_out(par)->ifindex);
++	other_dst = xt_flowoffload_dst(ct, dir, par, xt_in(par)->ifindex);
++
++	route->tuple[dir].dst		= this_dst;
++	route->tuple[!dir].dst		= other_dst;
++
++	if (!this_dst || !other_dst)
++		return -ENOENT;
++
++	if (dst_xfrm(this_dst) || dst_xfrm(other_dst))
++		return -EINVAL;
++
++	return 0;
++}
++
++static unsigned int
++flowoffload_tg(struct sk_buff *skb, const struct xt_action_param *par)
++{
++	const struct xt_flowoffload_target_info *info = par->targinfo;
++	struct tcphdr _tcph, *tcph = NULL;
++	enum ip_conntrack_info ctinfo;
++	enum ip_conntrack_dir dir;
++	struct nf_flow_route route;
++	struct flow_offload *flow = NULL;
++	struct nf_conn *ct;
++	struct net *net;
++
++	if (xt_flowoffload_skip(skb, xt_family(par)))
++		return XT_CONTINUE;
++
++	ct = nf_ct_get(skb, &ctinfo);
++	if (ct == NULL)
++		return XT_CONTINUE;
++
++	switch (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum) {
++	case IPPROTO_TCP:
++		if (ct->proto.tcp.state != TCP_CONNTRACK_ESTABLISHED)
++			return XT_CONTINUE;
++
++		tcph = skb_header_pointer(skb, par->thoff,
++					  sizeof(_tcph), &_tcph);
++		if (unlikely(!tcph || tcph->fin || tcph->rst))
++			return XT_CONTINUE;
++		break;
++	case IPPROTO_UDP:
++		break;
++	default:
++		return XT_CONTINUE;
++	}
++
++	if (nf_ct_ext_exist(ct, NF_CT_EXT_HELPER) ||
++	    ct->status & IPS_SEQ_ADJUST)
++		return XT_CONTINUE;
++
++	if (!nf_ct_is_confirmed(ct))
++		return XT_CONTINUE;
++
++	if (!xt_in(par) || !xt_out(par))
++		return XT_CONTINUE;
++
++	if (test_and_set_bit(IPS_OFFLOAD_BIT, &ct->status))
++		return XT_CONTINUE;
++
++	dir = CTINFO2DIR(ctinfo);
++
++	if (xt_flowoffload_route(skb, ct, par, &route, dir) == 0)
++		flow = flow_offload_alloc(ct, &route);
++
++	dst_release(route.tuple[dir].dst);
++	dst_release(route.tuple[!dir].dst);
++
++	if (!flow)
++		goto err_flow_route;
++
++	if (tcph) {
++		ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
++		ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
++	}
++
++	if (flow_offload_add(&nf_flowtable, flow) < 0)
++		goto err_flow_add;
++
++	xt_flowoffload_check_device(xt_in(par));
++	xt_flowoffload_check_device(xt_out(par));
++
++	net = read_pnet(&nf_flowtable.ft_net);
++	if (!net)
++		write_pnet(&nf_flowtable.ft_net, xt_net(par));
++
++	if (info->flags & XT_FLOWOFFLOAD_HW)
++		nf_flow_offload_hw_add(xt_net(par), flow, ct);
++
++	return XT_CONTINUE;
++
++err_flow_add:
++	flow_offload_free(flow);
++err_flow_route:
++	clear_bit(IPS_OFFLOAD_BIT, &ct->status);
++	return XT_CONTINUE;
++}
++
++
++static int flowoffload_chk(const struct xt_tgchk_param *par)
++{
++	struct xt_flowoffload_target_info *info = par->targinfo;
++
++	if (info->flags & ~XT_FLOWOFFLOAD_MASK)
++		return -EINVAL;
++
++	return 0;
++}
++
++static struct xt_target offload_tg_reg __read_mostly = {
++	.family		= NFPROTO_UNSPEC,
++	.name		= "FLOWOFFLOAD",
++	.revision	= 0,
++	.targetsize	= sizeof(struct xt_flowoffload_target_info),
++	.usersize	= sizeof(struct xt_flowoffload_target_info),
++	.checkentry	= flowoffload_chk,
++	.target		= flowoffload_tg,
++	.me		= THIS_MODULE,
++};
++
++static int xt_flowoffload_table_init(struct nf_flowtable *table)
++{
++	table->flags = NF_FLOWTABLE_F_HW;
++	nf_flow_table_init(table);
++	return 0;
++}
++
++static void xt_flowoffload_table_cleanup(struct nf_flowtable *table)
++{
++	nf_flow_table_free(table);
++}
++
++static int flow_offload_netdev_event(struct notifier_block *this,
++				     unsigned long event, void *ptr)
++{
++	struct xt_flowoffload_hook *hook = NULL;
++	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
++
++	if (event != NETDEV_UNREGISTER)
++		return NOTIFY_DONE;
++
++	spin_lock_bh(&hooks_lock);
++	hook = flow_offload_lookup_hook(dev);
++	if (hook) {
++		hlist_del(&hook->list);
++	}
++	spin_unlock_bh(&hooks_lock);
++	if (hook) {
++		nf_unregister_net_hook(hook->net, &hook->ops);
++		kfree(hook);
++	}
++
++	nf_flow_table_cleanup(dev);
++
++	return NOTIFY_DONE;
++}
++
++static struct notifier_block flow_offload_netdev_notifier = {
++	.notifier_call	= flow_offload_netdev_event,
++};
++
++static int __init xt_flowoffload_tg_init(void)
++{
++	int ret;
++
++	register_netdevice_notifier(&flow_offload_netdev_notifier);
++
++	INIT_DELAYED_WORK(&hook_work, xt_flowoffload_hook_work);
++
++	ret = xt_flowoffload_table_init(&nf_flowtable);
++	if (ret)
++		return ret;
++
++	ret = xt_register_target(&offload_tg_reg);
++	if (ret)
++		xt_flowoffload_table_cleanup(&nf_flowtable);
++
++	return ret;
++}
++
++static void __exit xt_flowoffload_tg_exit(void)
++{
++	xt_unregister_target(&offload_tg_reg);
++	xt_flowoffload_table_cleanup(&nf_flowtable);
++	unregister_netdevice_notifier(&flow_offload_netdev_notifier);
++}
++
++MODULE_LICENSE("GPL");
++module_init(xt_flowoffload_tg_init);
++module_exit(xt_flowoffload_tg_exit);
+--- a/net/netfilter/nf_flow_table_core.c
++++ b/net/netfilter/nf_flow_table_core.c
+@@ -7,7 +7,6 @@
+ #include <linux/netdevice.h>
+ #include <net/ip.h>
+ #include <net/ip6_route.h>
+-#include <net/netfilter/nf_tables.h>
+ #include <net/netfilter/nf_flow_table.h>
+ #include <net/netfilter/nf_conntrack.h>
+ #include <net/netfilter/nf_conntrack_core.h>
+@@ -351,8 +350,7 @@ flow_offload_lookup(struct nf_flowtable
+ }
+ EXPORT_SYMBOL_GPL(flow_offload_lookup);
+ 
+-static int
+-nf_flow_table_iterate(struct nf_flowtable *flow_table,
++int nf_flow_table_iterate(struct nf_flowtable *flow_table,
+ 		      void (*iter)(struct flow_offload *flow, void *data),
+ 		      void *data)
+ {
+@@ -385,6 +383,7 @@ nf_flow_table_iterate(struct nf_flowtabl
+ 
+ 	return err;
+ }
++EXPORT_SYMBOL_GPL(nf_flow_table_iterate);
+ 
+ static void nf_flow_offload_gc_step(struct flow_offload *flow, void *data)
+ {
+--- /dev/null
++++ b/include/uapi/linux/netfilter/xt_FLOWOFFLOAD.h
+@@ -0,0 +1,17 @@
++/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
++#ifndef _XT_FLOWOFFLOAD_H
++#define _XT_FLOWOFFLOAD_H
++
++#include <linux/types.h>
++
++enum {
++	XT_FLOWOFFLOAD_HW	= 1 << 0,
++
++	XT_FLOWOFFLOAD_MASK	= XT_FLOWOFFLOAD_HW
++};
++
++struct xt_flowoffload_target_info {
++	__u32 flags;
++};
++
++#endif /* _XT_FLOWOFFLOAD_H */
+--- a/include/net/netfilter/nf_flow_table.h
++++ b/include/net/netfilter/nf_flow_table.h
+@@ -133,6 +133,10 @@ static inline void flow_offload_dead(str
+ 	flow->flags |= FLOW_OFFLOAD_DYING;
+ }
+ 
++int nf_flow_table_iterate(struct nf_flowtable *flow_table,
++                      void (*iter)(struct flow_offload *flow, void *data),
++                      void *data);
++
+ 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);