kernel: backport act_ctinfo

ctinfo is a new tc filter action module.  It is designed to restore
information contained in firewall conntrack marks to other packet fields
and is typically used on packet ingress paths.  At present it has two
independent sub-functions or operating modes, DSCP restoration mode &
skb mark restoration mode.

The DSCP restore mode:

This mode copies DSCP values that have been placed in the firewall
conntrack mark back into the IPv4/v6 diffserv fields of relevant
packets.

The DSCP restoration is intended for use and has been found useful for
restoring ingress classifications based on egress classifications across
links that bleach or otherwise change DSCP, typically home ISP Internet
links.  Restoring DSCP on ingress on the WAN link allows qdiscs such as
but by no means limited to CAKE to shape inbound packets according to
policies that are easier to set & mark on egress.

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.  Thus marking the connection in some
manner on egress for later restoration of classification on ingress is
easier to implement.

Parameters related to DSCP restore mode:

dscpmask - a 32 bit mask of 6 contiguous bits and indicate bits of the
conntrack mark field contain the DSCP value to be restored.

statemask - a 32 bit mask of (usually) 1 bit length, outside the area
specified by dscpmask.  This represents a conditional operation flag
whereby the DSCP is only restored if the flag is set.  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 mask of zero disables the
conditional behaviour ie. the conntrack mark DSCP bits are always
restored to the ip diffserv field (assuming the conntrack entry is found
& the skb is an ipv4/ipv6 type)

e.g. dscpmask 0xfc000000 statemask 0x01000000

|----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      |
|-------------|

The skb mark restore mode (cpmark):

This mode copies the firewall conntrack mark to the skb's mark field.
It is completely the functional equivalent of the existing act_connmark
action with the additional feature of being able to apply a mask to the
restored value.

Parameters related to skb mark restore mode:

mask - a 32 bit mask applied to the firewall conntrack mark to mask out
bits unwanted for restoration.  This can be useful where the conntrack
mark is being used for different purposes by different applications.  If
not specified and by default the whole mark field is copied (i.e.
default mask of 0xffffffff)

e.g. mask 0x00ffffff to mask out the top 8 bits being used by the
aforementioned DSCP restore mode.

|----0x00----conntrack mark----ffffff---|
| Bits 31-24 |                          |
| DSCP & flag|      some value here     |
|---------------------------------------|
			|
			|
			v
|------------skb mark-------------------|
|            |                          |
|  zeroed    |                          |
|---------------------------------------|

Overall parameters:

zone - conntrack zone

control - action related control (reclassify | pipe | drop | continue |
ok | goto chain <CHAIN_INDEX>)

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Make suitable adjustments for backporting to 4.14 & 4.19

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>

2 files changed, 1201 insertions, 0 deletions

diff --git a/target/linux/generic/backport-4.14/380-v5.3-net-sched-Introduce-act_ctinfo-action.patch b/target/linux/generic/backport-4.14/380-v5.3-net-sched-Introduce-act_ctinfo-action.patch
new file mode 100644
index 0000000000..26063985c0
--- /dev/null
+++ b/target/linux/generic/backport-4.14/380-v5.3-net-sched-Introduce-act_ctinfo-action.patch
@@ -0,0 +1,584 @@
+From 21d81d05787908b13a4079f42a63a5b3254b7ab4 Mon Sep 17 00:00:00 2001
+From: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
+Date: Wed, 13 Mar 2019 20:54:49 +0000
+Subject: [PATCH] net: sched: Introduce act_ctinfo action
+
+ctinfo is a new tc filter action module.  It is designed to restore DSCPs
+stored in conntrack marks
+
+The feature is intended for use and has been found useful for restoring
+ingress classifications based on egress classifications across links
+that bleach or otherwise change DSCP, typically home ISP Internet links.
+Restoring DSCP on ingress on the WAN link allows qdiscs such as CAKE to
+shape inbound packets according to policies that are easier to implement
+on egress.
+
+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.
+
+ctinfo understands the following parameters:
+
+dscp mask[/statemask]
+
+mask - a 32 bit mask of at least 6 contiguous bits where conndscp will
+place the DSCP in conntrack mark.  The DSCP is left-shifted by the
+number of unset lower bits of the mask before storing into the mark
+field.
+
+statemask - a 32 bit mask of (usually) 1 bit length, outside the area
+specified by mask.  This represents a conditional operation flag the
+DSCP is only restored if the flag is set.  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 mask of zero disables the conditional behaviour.
+
+optional parameters:
+
+zone - conntrack zone
+
+control - action related control (reclassify | pipe | drop | continue |
+ok | goto chain <CHAIN_INDEX>
+
+Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
+---
+ include/net/tc_act/tc_ctinfo.h        |  28 ++
+ include/uapi/linux/pkt_cls.h          |   3 +-
+ include/uapi/linux/tc_act/tc_ctinfo.h |  34 +++
+ net/sched/Kconfig                     |  13 +
+ net/sched/Makefile                    |   1 +
+ net/sched/act_ctinfo.c                | 394 ++++++++++++++++++++++++++
+ 6 files changed, 472 insertions(+), 1 deletion(-)
+ create mode 100644 include/net/tc_act/tc_ctinfo.h
+ create mode 100644 include/uapi/linux/tc_act/tc_ctinfo.h
+ create mode 100644 net/sched/act_ctinfo.c
+
+diff --git a/include/net/tc_act/tc_ctinfo.h b/include/net/tc_act/tc_ctinfo.h
+new file mode 100644
+index 000000000000..d6a688571672
+--- /dev/null
++++ b/include/net/tc_act/tc_ctinfo.h
+@@ -0,0 +1,28 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++#ifndef __NET_TC_CTINFO_H
++#define __NET_TC_CTINFO_H
++
++#include <net/act_api.h>
++
++struct tcf_ctinfo_params {
++	struct rcu_head rcu;
++	struct net *net;
++	u32 dscpmask;
++	u32 dscpstatemask;
++	u32 cpmarkmask;
++	u16 zone;
++	u8 mode;
++	u8 dscpmaskshift;
++};
++
++struct tcf_ctinfo {
++	struct tc_action common;
++	struct tcf_ctinfo_params __rcu *params;
++	u64 stats_dscp_set;
++	u64 stats_dscp_error;
++	u64 stats_cpmark_set;
++};
++
++#define to_ctinfo(a) ((struct tcf_ctinfo *)a)
++
++#endif /* __NET_TC_CTINFO_H */
+diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
+index 46c506615f4a..408b02fbb34a 100644
+--- a/include/uapi/linux/pkt_cls.h
++++ b/include/uapi/linux/pkt_cls.h
+@@ -66,7 +66,8 @@ enum {
+ 	TCA_ID_UNSPEC=0,
+ 	TCA_ID_POLICE=1,
+ 	/* other actions go here */
+-	__TCA_ID_MAX=255
++	TCA_ID_CTINFO=27,
++	__TCA_ID_MAX = 255
+ };
+ 
+ #define TCA_ID_MAX __TCA_ID_MAX
+diff --git a/include/uapi/linux/tc_act/tc_ctinfo.h b/include/uapi/linux/tc_act/tc_ctinfo.h
+new file mode 100644
+index 000000000000..da803e05a89b
+--- /dev/null
++++ b/include/uapi/linux/tc_act/tc_ctinfo.h
+@@ -0,0 +1,34 @@
++/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
++#ifndef __UAPI_TC_CTINFO_H
++#define __UAPI_TC_CTINFO_H
++
++#include <linux/types.h>
++#include <linux/pkt_cls.h>
++
++struct tc_ctinfo {
++	tc_gen;
++};
++
++enum {
++	TCA_CTINFO_UNSPEC,
++	TCA_CTINFO_PAD,
++	TCA_CTINFO_TM,
++	TCA_CTINFO_ACT,
++	TCA_CTINFO_ZONE,
++	TCA_CTINFO_PARMS_DSCP_MASK,
++	TCA_CTINFO_PARMS_DSCP_STATEMASK,
++	TCA_CTINFO_PARMS_CPMARK_MASK,
++	TCA_CTINFO_STATS_DSCP_SET,
++	TCA_CTINFO_STATS_DSCP_ERROR,
++	TCA_CTINFO_STATS_CPMARK_SET,
++	__TCA_CTINFO_MAX
++};
++
++#define TCA_CTINFO_MAX (__TCA_CTINFO_MAX - 1)
++
++enum {
++	CTINFO_MODE_DSCP	= BIT(0),
++	CTINFO_MODE_CPMARK	= BIT(1)
++};
++
++#endif
+diff --git a/net/sched/Kconfig b/net/sched/Kconfig
+index e70ed26485a2..962d90f72f54 100644
+--- a/net/sched/Kconfig
++++ b/net/sched/Kconfig
+@@ -808,6 +808,19 @@ config NET_ACT_CONNMARK
+ 	  To compile this code as a module, choose M here: the
+ 	  module will be called act_connmark.
+ 
++config NET_ACT_CTINFO
++        tristate "Netfilter Connmark to DSCP Retriever"
++        depends on NET_CLS_ACT && NETFILTER && IP_NF_IPTABLES
++        depends on NF_CONNTRACK && NF_CONNTRACK_MARK
++        help
++	  Say Y here to allow transfer of a connmark stored DSCP into
++	  ipv4/v6 diffserv
++
++	  If unsure, say N.
++
++	  To compile this code as a module, choose M here: the
++	  module will be called act_ctinfo.
++
+ config NET_ACT_SKBMOD
+         tristate "skb data modification action"
+         depends on NET_CLS_ACT
+diff --git a/net/sched/Makefile b/net/sched/Makefile
+index 9e43a4721ef8..44ee5b87b895 100644
+--- a/net/sched/Makefile
++++ b/net/sched/Makefile
+@@ -21,6 +21,7 @@ obj-$(CONFIG_NET_ACT_CSUM)	+= act_csum.o
+ obj-$(CONFIG_NET_ACT_VLAN)	+= act_vlan.o
+ obj-$(CONFIG_NET_ACT_BPF)	+= act_bpf.o
+ obj-$(CONFIG_NET_ACT_CONNMARK)	+= act_connmark.o
++obj-$(CONFIG_NET_ACT_CTINFO)	+= act_ctinfo.o
+ obj-$(CONFIG_NET_ACT_SKBMOD)	+= act_skbmod.o
+ obj-$(CONFIG_NET_ACT_IFE)	+= act_ife.o
+ obj-$(CONFIG_NET_IFE_SKBMARK)	+= act_meta_mark.o
+diff --git a/net/sched/act_ctinfo.c b/net/sched/act_ctinfo.c
+new file mode 100644
+index 000000000000..e65344e32801
+--- /dev/null
++++ b/net/sched/act_ctinfo.c
+@@ -0,0 +1,394 @@
++// SPDX-License-Identifier: GPL-2.0+
++/* net/sched/act_ctinfo.c  netfilter ctinfo connmark actions
++ *
++ * Copyright (c) 2019 Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
++ */
++
++#include <linux/module.h>
++#include <linux/init.h>
++#include <linux/kernel.h>
++#include <linux/skbuff.h>
++#include <linux/rtnetlink.h>
++#include <linux/pkt_cls.h>
++#include <linux/ip.h>
++#include <linux/ipv6.h>
++#include <net/netlink.h>
++#include <net/pkt_sched.h>
++#include <net/act_api.h>
++#include <net/pkt_cls.h>
++#include <uapi/linux/tc_act/tc_ctinfo.h>
++#include <net/tc_act/tc_ctinfo.h>
++
++#include <net/netfilter/nf_conntrack.h>
++#include <net/netfilter/nf_conntrack_core.h>
++#include <net/netfilter/nf_conntrack_ecache.h>
++#include <net/netfilter/nf_conntrack_zones.h>
++
++static struct tc_action_ops act_ctinfo_ops;
++static unsigned int ctinfo_net_id;
++
++static void tcf_ctinfo_dscp_set(struct nf_conn *ct, struct tcf_ctinfo *ca,
++				struct tcf_ctinfo_params *cp,
++				struct sk_buff *skb, int wlen, int proto)
++{
++	u8 dscp,newdscp;
++
++	newdscp = (((ct->mark & cp->dscpmask) >> cp->dscpmaskshift) << 2) &
++		     ~INET_ECN_MASK;
++
++	/* mark contains DSCP so restore DSCP bits from ct->mark into diffserv */
++	/* using overlimits stats to count how many DSCP updates	       */
++	switch (proto) {
++	case NFPROTO_IPV4:
++		dscp = ipv4_get_dsfield(ip_hdr(skb)) & ~INET_ECN_MASK;
++		if (dscp != newdscp) {
++			if (likely(!skb_try_make_writable(skb, wlen))) {
++				ipv4_change_dsfield(ip_hdr(skb),
++						    INET_ECN_MASK,
++						    newdscp);
++				ca->stats_dscp_set++;
++			} else {
++				ca->stats_dscp_error++;
++			}
++		}
++		break;
++	case NFPROTO_IPV6:
++		dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & ~INET_ECN_MASK;
++		if (dscp != newdscp) {
++			if (likely(!skb_try_make_writable(skb, wlen))) {
++				ipv6_change_dsfield(ipv6_hdr(skb),
++						    INET_ECN_MASK,
++						    newdscp);
++				ca->stats_dscp_set++;
++			} else {
++				ca->stats_dscp_error++;
++			}
++		}
++		break;
++	default:
++		break;
++	}
++}
++
++static void tcf_ctinfo_cpmark_set(struct nf_conn *ct, struct tcf_ctinfo *ca,
++				struct tcf_ctinfo_params *cp,
++				struct sk_buff *skb)
++{
++	ca->stats_cpmark_set++;
++	skb->mark = ct->mark & cp->cpmarkmask;
++}
++
++static int tcf_ctinfo_act(struct sk_buff *skb, const struct tc_action *a,
++			  struct tcf_result *res)
++{
++	const struct nf_conntrack_tuple_hash *thash = NULL;
++	struct tcf_ctinfo *ca = to_ctinfo(a);
++	struct nf_conntrack_tuple tuple;
++	struct nf_conntrack_zone zone;
++	enum ip_conntrack_info ctinfo;
++	struct tcf_ctinfo_params *cp;
++	struct nf_conn *ct;
++	int proto, wlen;
++	int action;
++
++	cp = rcu_dereference_bh(ca->params);
++
++	tcf_lastuse_update(&ca->tcf_tm);
++	bstats_update(&ca->tcf_bstats, skb);
++	action = READ_ONCE(ca->tcf_action);
++
++	wlen = skb_network_offset(skb);
++	if (tc_skb_protocol(skb) == htons(ETH_P_IP)) {
++		wlen += sizeof(struct iphdr);
++		if (!pskb_may_pull(skb, wlen))
++			goto out;
++
++		proto = NFPROTO_IPV4;
++	} else if (tc_skb_protocol(skb) == htons(ETH_P_IPV6)) {
++		wlen += sizeof(struct ipv6hdr);
++		if (!pskb_may_pull(skb, wlen))
++			goto out;
++
++		proto = NFPROTO_IPV6;
++	} else {
++		goto out;
++	}
++
++	ct = nf_ct_get(skb, &ctinfo);
++	if (!ct) { /* look harder, usually ingress */
++		if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
++				       proto, cp->net, &tuple))
++			goto out;
++		zone.id = cp->zone;
++		zone.dir = NF_CT_DEFAULT_ZONE_DIR;
++
++		thash = nf_conntrack_find_get(cp->net, &zone, &tuple);
++		if (!thash)
++			goto out;
++
++		ct = nf_ct_tuplehash_to_ctrack(thash);
++	}
++
++	if (cp->mode & CTINFO_MODE_DSCP)
++		if (!cp->dscpstatemask || (ct->mark & cp->dscpstatemask))
++			tcf_ctinfo_dscp_set(ct, ca, cp, skb, wlen, proto);
++
++	if (cp->mode & CTINFO_MODE_CPMARK)
++		tcf_ctinfo_cpmark_set(ct, ca, cp, skb);
++
++	if (thash)
++		nf_ct_put(ct);
++out:
++	return action;
++}
++
++static const struct nla_policy ctinfo_policy[TCA_CTINFO_MAX + 1] = {
++	[TCA_CTINFO_ACT]		  = { .len = sizeof(struct
++							    tc_ctinfo) },
++	[TCA_CTINFO_ZONE]		  = { .type = NLA_U16 },
++	[TCA_CTINFO_PARMS_DSCP_MASK]	  = { .type = NLA_U32 },
++	[TCA_CTINFO_PARMS_DSCP_STATEMASK] = { .type = NLA_U32 },
++	[TCA_CTINFO_PARMS_CPMARK_MASK]	  = { .type = NLA_U32 },
++};
++
++static int tcf_ctinfo_init(struct net *net, struct nlattr *nla,
++			     struct nlattr *est, struct tc_action **a,
++			     int ovr, int bind)
++{
++	struct tc_action_net *tn = net_generic(net, ctinfo_net_id);
++	struct nlattr *tb[TCA_CTINFO_MAX + 1];
++	struct tcf_ctinfo_params *cp_new;
++/*	struct tcf_chain *goto_ch = NULL; */
++	u32 dscpmask = 0, dscpstatemask;
++	struct tc_ctinfo *actparm;
++	struct tcf_ctinfo *ci;
++	u8 dscpmaskshift;
++	int ret = 0, err;
++
++	if (!nla)
++		return -EINVAL;
++
++	err = nla_parse_nested(tb, TCA_CTINFO_MAX, nla, ctinfo_policy, NULL);
++	if (err < 0)
++		return err;
++
++	if (!tb[TCA_CTINFO_ACT])
++		return -EINVAL;
++	actparm = nla_data(tb[TCA_CTINFO_ACT]);
++
++	/* do some basic validation here before dynamically allocating things */
++	/* that we would otherwise have to clean up.			      */
++	if (tb[TCA_CTINFO_PARMS_DSCP_MASK]) {
++		dscpmask = nla_get_u32(tb[TCA_CTINFO_PARMS_DSCP_MASK]);
++		/* need contiguous 6 bit mask */
++		dscpmaskshift = dscpmask ? __ffs(dscpmask) : 0;
++		if ((~0 & (dscpmask >> dscpmaskshift)) != 0x3f)
++			return -EINVAL;
++		dscpstatemask = tb[TCA_CTINFO_PARMS_DSCP_STATEMASK] ?
++			nla_get_u32(tb[TCA_CTINFO_PARMS_DSCP_STATEMASK]) : 0;
++		/* mask & statemask must not overlap */
++		if (dscpmask & dscpstatemask)
++			return -EINVAL;
++	}
++	/* done the validation:now to the actual action allocation */
++	err = tcf_idr_check(tn, actparm->index, a, bind);
++	if (!err) {
++		ret = tcf_idr_create(tn, actparm->index, est, a,
++				     &act_ctinfo_ops, bind, false);
++		if (ret) {
++		/*	tcf_idr_cleanup(tn, actparm->index); */
++			return ret;
++		}
++		ret = ACT_P_CREATED;
++	} else if (err > 0) {
++		if (bind) /* don't override defaults */
++			return 0;
++		if (!ovr) {
++			tcf_idr_release(*a, bind);
++			return -EEXIST;
++		}
++	} else {
++		return err;
++	}
++
++/*	err = tcf_action_check_ctrlact(actparm->action, tp, &goto_ch, extack);
++	if (err < 0)
++		goto release_idr;
++		*/
++
++	ci = to_ctinfo(*a);
++
++	cp_new = kzalloc(sizeof(*cp_new), GFP_KERNEL);
++	if (unlikely(!cp_new)) {
++		err = -ENOMEM;
++		goto put_chain;
++	}
++
++	cp_new->net = net;
++	cp_new->zone = tb[TCA_CTINFO_ZONE] ?
++			nla_get_u16(tb[TCA_CTINFO_ZONE]) : 0;
++	if (dscpmask) {
++		cp_new->dscpmask = dscpmask;
++		cp_new->dscpmaskshift = dscpmaskshift;
++		cp_new->dscpstatemask = dscpstatemask;
++		cp_new->mode |= CTINFO_MODE_DSCP;
++	}
++
++	if (tb[TCA_CTINFO_PARMS_CPMARK_MASK]) {
++		cp_new->cpmarkmask = nla_get_u32(tb[TCA_CTINFO_PARMS_CPMARK_MASK]);
++		cp_new->mode |= CTINFO_MODE_CPMARK;
++	}
++
++	spin_lock_bh(&ci->tcf_lock);
++/*	goto_ch = tcf_action_set_ctrlact(*a, actparm->action, goto_ch); */
++	ci->tcf_action = actparm->action;
++	rcu_swap_protected(ci->params, cp_new,
++				lockdep_is_held(&ci->tcf_lock));
++	spin_unlock_bh(&ci->tcf_lock);
++
++/*	if (goto_ch)
++		tcf_chain_put_by_act(goto_ch); */
++	if (cp_new)
++		kfree_rcu(cp_new, rcu);
++
++	if (ret == ACT_P_CREATED)
++		tcf_idr_insert(tn, *a);
++
++	return ret;
++
++put_chain:
++/*	if (goto_ch)
++		tcf_chain_put_by_act(goto_ch); */
++/*release_idr:*/
++	tcf_idr_release(*a, bind);
++	return err;
++}
++
++static int tcf_ctinfo_dump(struct sk_buff *skb, struct tc_action *a,
++			   int bind, int ref)
++{
++	struct tcf_ctinfo *ci = to_ctinfo(a);
++	struct tc_ctinfo opt = {
++		.index   = ci->tcf_index,
++		.refcnt  = ci->tcf_refcnt - ref,
++		.bindcnt = ci->tcf_bindcnt - bind,
++	};
++	unsigned char *b = skb_tail_pointer(skb);
++	struct tcf_ctinfo_params *cp;
++	struct tcf_t t;
++
++	spin_lock_bh(&ci->tcf_lock);
++	cp = rcu_dereference_protected(ci->params,
++				       lockdep_is_held(&ci->tcf_lock));
++
++	tcf_tm_dump(&t, &ci->tcf_tm);
++	if (nla_put_64bit(skb, TCA_CTINFO_TM, sizeof(t), &t, TCA_CTINFO_PAD))
++		goto nla_put_failure;
++
++	opt.action = ci->tcf_action;
++	if (nla_put(skb, TCA_CTINFO_ACT, sizeof(opt), &opt))
++		goto nla_put_failure;
++
++	if (nla_put_u16(skb, TCA_CTINFO_ZONE, cp->zone))
++		goto nla_put_failure;
++
++	if (cp->mode & CTINFO_MODE_DSCP) {
++		if (nla_put_u32(skb, TCA_CTINFO_PARMS_DSCP_MASK,
++				cp->dscpmask))
++			goto nla_put_failure;
++		if (nla_put_u32(skb, TCA_CTINFO_PARMS_DSCP_STATEMASK,
++				cp->dscpstatemask))
++			goto nla_put_failure;
++	}
++
++	if (cp->mode & CTINFO_MODE_CPMARK) {
++		if (nla_put_u32(skb, TCA_CTINFO_PARMS_CPMARK_MASK,
++				cp->cpmarkmask))
++			goto nla_put_failure;
++	}
++
++	if (nla_put_u64_64bit(skb, TCA_CTINFO_STATS_DSCP_SET,
++			      ci->stats_dscp_set, TCA_CTINFO_PAD))
++		goto nla_put_failure;
++
++	if (nla_put_u64_64bit(skb, TCA_CTINFO_STATS_DSCP_ERROR,
++			      ci->stats_dscp_error, TCA_CTINFO_PAD))
++		goto nla_put_failure;
++
++	if (nla_put_u64_64bit(skb, TCA_CTINFO_STATS_CPMARK_SET,
++			      ci->stats_cpmark_set, TCA_CTINFO_PAD))
++		goto nla_put_failure;
++
++	spin_unlock_bh(&ci->tcf_lock);
++	return skb->len;
++
++nla_put_failure:
++	spin_unlock_bh(&ci->tcf_lock);
++	nlmsg_trim(skb, b);
++	return -1;
++}
++
++static int tcf_ctinfo_walker(struct net *net, struct sk_buff *skb,
++			       struct netlink_callback *cb, int type,
++			       const struct tc_action_ops *ops)
++{
++	struct tc_action_net *tn = net_generic(net, ctinfo_net_id);
++
++	return tcf_generic_walker(tn, skb, cb, type, ops);
++}
++
++static int tcf_ctinfo_search(struct net *net, struct tc_action **a, u32 index)
++{
++	struct tc_action_net *tn = net_generic(net, ctinfo_net_id);
++
++	return tcf_idr_search(tn, a, index);
++}
++
++static struct tc_action_ops act_ctinfo_ops = {
++	.kind	= "ctinfo",
++	.type	= TCA_ID_CTINFO,
++	.owner	= THIS_MODULE,
++	.act	= tcf_ctinfo_act,
++	.dump	= tcf_ctinfo_dump,
++	.init	= tcf_ctinfo_init,
++	.walk	= tcf_ctinfo_walker,
++	.lookup	= tcf_ctinfo_search,
++	.size	= sizeof(struct tcf_ctinfo),
++};
++
++static __net_init int ctinfo_init_net(struct net *net)
++{
++	struct tc_action_net *tn = net_generic(net, ctinfo_net_id);
++
++	return tc_action_net_init(tn, &act_ctinfo_ops);
++}
++
++static void __net_exit ctinfo_exit_net(struct net *net)
++{
++	struct tc_action_net *tn = net_generic(net, ctinfo_net_id);
++
++	tc_action_net_exit(tn);
++}
++
++static struct pernet_operations ctinfo_net_ops = {
++	.init = ctinfo_init_net,
++	.exit = ctinfo_exit_net,
++	.id   = &ctinfo_net_id,
++	.size = sizeof(struct tc_action_net),
++};
++
++static int __init ctinfo_init_module(void)
++{
++	return tcf_register_action(&act_ctinfo_ops, &ctinfo_net_ops);
++}
++
++static void __exit ctinfo_cleanup_module(void)
++{
++	tcf_unregister_action(&act_ctinfo_ops, &ctinfo_net_ops);
++}
++
++module_init(ctinfo_init_module);
++module_exit(ctinfo_cleanup_module);
++MODULE_AUTHOR("Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>");
++MODULE_DESCRIPTION("Conntrack mark to DSCP restoring");
++MODULE_LICENSE("GPL");
+-- 
+2.20.1 (Apple Git-117)
+
diff --git a/target/linux/generic/backport-4.19/380-v5.3-net-sched-Introduce-act_ctinfo-action.patch b/target/linux/generic/backport-4.19/380-v5.3-net-sched-Introduce-act_ctinfo-action.patch
new file mode 100644
index 0000000000..632f41ef98
--- /dev/null
+++ b/target/linux/generic/backport-4.19/380-v5.3-net-sched-Introduce-act_ctinfo-action.patch
@@ -0,0 +1,617 @@
+From 402c8d61d2f27060be14849fcb30682f75f3bf3b Mon Sep 17 00:00:00 2001
+From: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
+Date: Wed, 13 Mar 2019 20:54:49 +0000
+Subject: [PATCH] net: sched: Introduce act_ctinfo action
+
+ctinfo is a new tc filter action module.  It is designed to restore DSCPs
+stored in conntrack marks into the ipv4/v6 diffserv field.
+
+The feature is intended for use and has been found useful for restoring
+ingress classifications based on egress classifications across links
+that bleach or otherwise change DSCP, typically home ISP Internet links.
+Restoring DSCP on ingress on the WAN link allows qdiscs such as CAKE to
+shape inbound packets according to policies that are easier to indicate
+on egress.
+
+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.
+
+ctinfo understands the following parameters:
+
+dscp dscpmask[/statemask]
+
+dscpmask - a 32 bit mask of at least 6 contiguous bits and indicates
+where ctinfo will find the DSCP bits stored in the conntrack mark.
+
+statemask - a 32 bit mask of (usually) 1 bit length, outside the area
+specified by dscpmask.  This represents a conditional operation flag
+whereby the DSCP is only restored if the flag is set.  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 mask of zero disables the
+conditional behaviour ie. the conntrack mark DSCP bits are always
+restored to the ip diffserv field (assuming the conntrack entry is found
+& the skb is an ipv4/ipv6 type)
+
+optional parameters:
+
+zone - conntrack zone
+
+control - action related control (reclassify | pipe | drop | continue |
+ok | goto chain <CHAIN_INDEX>)
+
+e.g. dscp 0xfc000000/0x01000000
+
+|----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/net/tc_act/tc_ctinfo.h            |  28 ++
+ include/uapi/linux/pkt_cls.h              |   3 +-
+ include/uapi/linux/tc_act/tc_ctinfo.h     |  34 ++
+ net/sched/Kconfig                         |  17 +
+ net/sched/Makefile                        |   1 +
+ net/sched/act_ctinfo.c                    | 395 ++++++++++++++++++++++
+ tools/testing/selftests/tc-testing/config |   1 +
+ 7 files changed, 478 insertions(+), 1 deletion(-)
+ create mode 100644 include/net/tc_act/tc_ctinfo.h
+ create mode 100644 include/uapi/linux/tc_act/tc_ctinfo.h
+ create mode 100644 net/sched/act_ctinfo.c
+
+diff --git a/include/net/tc_act/tc_ctinfo.h b/include/net/tc_act/tc_ctinfo.h
+new file mode 100644
+index 000000000000..d6a688571672
+--- /dev/null
++++ b/include/net/tc_act/tc_ctinfo.h
+@@ -0,0 +1,28 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++#ifndef __NET_TC_CTINFO_H
++#define __NET_TC_CTINFO_H
++
++#include <net/act_api.h>
++
++struct tcf_ctinfo_params {
++	struct rcu_head rcu;
++	struct net *net;
++	u32 dscpmask;
++	u32 dscpstatemask;
++	u32 cpmarkmask;
++	u16 zone;
++	u8 mode;
++	u8 dscpmaskshift;
++};
++
++struct tcf_ctinfo {
++	struct tc_action common;
++	struct tcf_ctinfo_params __rcu *params;
++	u64 stats_dscp_set;
++	u64 stats_dscp_error;
++	u64 stats_cpmark_set;
++};
++
++#define to_ctinfo(a) ((struct tcf_ctinfo *)a)
++
++#endif /* __NET_TC_CTINFO_H */
+diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
+index be382fb0592d..71e10c5a96a0 100644
+--- a/include/uapi/linux/pkt_cls.h
++++ b/include/uapi/linux/pkt_cls.h
+@@ -68,7 +68,8 @@ enum {
+ 	TCA_ID_UNSPEC=0,
+ 	TCA_ID_POLICE=1,
+ 	/* other actions go here */
+-	__TCA_ID_MAX=255
++	TCA_ID_CTINFO,
++	__TCA_ID_MAX = 255
+ };
+ 
+ #define TCA_ID_MAX __TCA_ID_MAX
+diff --git a/include/uapi/linux/tc_act/tc_ctinfo.h b/include/uapi/linux/tc_act/tc_ctinfo.h
+new file mode 100644
+index 000000000000..da803e05a89b
+--- /dev/null
++++ b/include/uapi/linux/tc_act/tc_ctinfo.h
+@@ -0,0 +1,34 @@
++/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
++#ifndef __UAPI_TC_CTINFO_H
++#define __UAPI_TC_CTINFO_H
++
++#include <linux/types.h>
++#include <linux/pkt_cls.h>
++
++struct tc_ctinfo {
++	tc_gen;
++};
++
++enum {
++	TCA_CTINFO_UNSPEC,
++	TCA_CTINFO_PAD,
++	TCA_CTINFO_TM,
++	TCA_CTINFO_ACT,
++	TCA_CTINFO_ZONE,
++	TCA_CTINFO_PARMS_DSCP_MASK,
++	TCA_CTINFO_PARMS_DSCP_STATEMASK,
++	TCA_CTINFO_PARMS_CPMARK_MASK,
++	TCA_CTINFO_STATS_DSCP_SET,
++	TCA_CTINFO_STATS_DSCP_ERROR,
++	TCA_CTINFO_STATS_CPMARK_SET,
++	__TCA_CTINFO_MAX
++};
++
++#define TCA_CTINFO_MAX (__TCA_CTINFO_MAX - 1)
++
++enum {
++	CTINFO_MODE_DSCP	= BIT(0),
++	CTINFO_MODE_CPMARK	= BIT(1)
++};
++
++#endif
+diff --git a/net/sched/Kconfig b/net/sched/Kconfig
+index e95741388311..1d79d5dba6e4 100644
+--- a/net/sched/Kconfig
++++ b/net/sched/Kconfig
+@@ -866,6 +866,23 @@ config NET_ACT_CONNMARK
+ 	  To compile this code as a module, choose M here: the
+ 	  module will be called act_connmark.
+ 
++config NET_ACT_CTINFO
++        tristate "Netfilter Connection Mark Actions"
++        depends on NET_CLS_ACT && NETFILTER && IP_NF_IPTABLES
++        depends on NF_CONNTRACK && NF_CONNTRACK_MARK
++        help
++	  Say Y here to allow transfer of a connmark stored information.
++	  Current actions transfer connmark stored DSCP into
++	  ipv4/v6 diffserv and/or to transfer connmark to packet
++	  mark.  Both are useful for restoring egress based marks
++	  back onto ingress connections for qdisc priority mapping
++	  purposes.
++
++	  If unsure, say N.
++
++	  To compile this code as a module, choose M here: the
++	  module will be called act_ctinfo.
++
+ config NET_ACT_SKBMOD
+         tristate "skb data modification action"
+         depends on NET_CLS_ACT
+diff --git a/net/sched/Makefile b/net/sched/Makefile
+index f0403f49edcb..bb3c2bc44af7 100644
+--- a/net/sched/Makefile
++++ b/net/sched/Makefile
+@@ -21,6 +21,7 @@ obj-$(CONFIG_NET_ACT_CSUM)	+= act_csum.o
+ obj-$(CONFIG_NET_ACT_VLAN)	+= act_vlan.o
+ obj-$(CONFIG_NET_ACT_BPF)	+= act_bpf.o
+ obj-$(CONFIG_NET_ACT_CONNMARK)	+= act_connmark.o
++obj-$(CONFIG_NET_ACT_CTINFO)	+= act_ctinfo.o
+ obj-$(CONFIG_NET_ACT_SKBMOD)	+= act_skbmod.o
+ obj-$(CONFIG_NET_ACT_IFE)	+= act_ife.o
+ obj-$(CONFIG_NET_IFE_SKBMARK)	+= act_meta_mark.o
+diff --git a/net/sched/act_ctinfo.c b/net/sched/act_ctinfo.c
+new file mode 100644
+index 000000000000..8975cb4976aa
+--- /dev/null
++++ b/net/sched/act_ctinfo.c
+@@ -0,0 +1,395 @@
++// SPDX-License-Identifier: GPL-2.0+
++/* net/sched/act_ctinfo.c  netfilter ctinfo connmark actions
++ *
++ * Copyright (c) 2019 Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
++ */
++
++#include <linux/module.h>
++#include <linux/init.h>
++#include <linux/kernel.h>
++#include <linux/skbuff.h>
++#include <linux/rtnetlink.h>
++#include <linux/pkt_cls.h>
++#include <linux/ip.h>
++#include <linux/ipv6.h>
++#include <net/netlink.h>
++#include <net/pkt_sched.h>
++#include <net/act_api.h>
++#include <net/pkt_cls.h>
++#include <uapi/linux/tc_act/tc_ctinfo.h>
++#include <net/tc_act/tc_ctinfo.h>
++
++#include <net/netfilter/nf_conntrack.h>
++#include <net/netfilter/nf_conntrack_core.h>
++#include <net/netfilter/nf_conntrack_ecache.h>
++#include <net/netfilter/nf_conntrack_zones.h>
++
++static struct tc_action_ops act_ctinfo_ops;
++static unsigned int ctinfo_net_id;
++
++static void tcf_ctinfo_dscp_set(struct nf_conn *ct, struct tcf_ctinfo *ca,
++				struct tcf_ctinfo_params *cp,
++				struct sk_buff *skb, int wlen, int proto)
++{
++	u8 dscp, newdscp;
++
++	newdscp = (((ct->mark & cp->dscpmask) >> cp->dscpmaskshift) << 2) &
++		     ~INET_ECN_MASK;
++
++	switch (proto) {
++	case NFPROTO_IPV4:
++		dscp = ipv4_get_dsfield(ip_hdr(skb)) & ~INET_ECN_MASK;
++		if (dscp != newdscp) {
++			if (likely(!skb_try_make_writable(skb, wlen))) {
++				ipv4_change_dsfield(ip_hdr(skb),
++						    INET_ECN_MASK,
++						    newdscp);
++				ca->stats_dscp_set++;
++			} else {
++				ca->stats_dscp_error++;
++			}
++		}
++		break;
++	case NFPROTO_IPV6:
++		dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & ~INET_ECN_MASK;
++		if (dscp != newdscp) {
++			if (likely(!skb_try_make_writable(skb, wlen))) {
++				ipv6_change_dsfield(ipv6_hdr(skb),
++						    INET_ECN_MASK,
++						    newdscp);
++				ca->stats_dscp_set++;
++			} else {
++				ca->stats_dscp_error++;
++			}
++		}
++		break;
++	default:
++		break;
++	}
++}
++
++static void tcf_ctinfo_cpmark_set(struct nf_conn *ct, struct tcf_ctinfo *ca,
++				  struct tcf_ctinfo_params *cp,
++				  struct sk_buff *skb)
++{
++	ca->stats_cpmark_set++;
++	skb->mark = ct->mark & cp->cpmarkmask;
++}
++
++static int tcf_ctinfo_act(struct sk_buff *skb, const struct tc_action *a,
++			  struct tcf_result *res)
++{
++	const struct nf_conntrack_tuple_hash *thash = NULL;
++	struct tcf_ctinfo *ca = to_ctinfo(a);
++	struct nf_conntrack_tuple tuple;
++	struct nf_conntrack_zone zone;
++	enum ip_conntrack_info ctinfo;
++	struct tcf_ctinfo_params *cp;
++	struct nf_conn *ct;
++	int proto, wlen;
++	int action;
++
++	cp = rcu_dereference_bh(ca->params);
++
++	tcf_lastuse_update(&ca->tcf_tm);
++	bstats_update(&ca->tcf_bstats, skb);
++	action = READ_ONCE(ca->tcf_action);
++
++	wlen = skb_network_offset(skb);
++	if (tc_skb_protocol(skb) == htons(ETH_P_IP)) {
++		wlen += sizeof(struct iphdr);
++		if (!pskb_may_pull(skb, wlen))
++			goto out;
++
++		proto = NFPROTO_IPV4;
++	} else if (tc_skb_protocol(skb) == htons(ETH_P_IPV6)) {
++		wlen += sizeof(struct ipv6hdr);
++		if (!pskb_may_pull(skb, wlen))
++			goto out;
++
++		proto = NFPROTO_IPV6;
++	} else {
++		goto out;
++	}
++
++	ct = nf_ct_get(skb, &ctinfo);
++	if (!ct) { /* look harder, usually ingress */
++		if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
++				       proto, cp->net, &tuple))
++			goto out;
++		zone.id = cp->zone;
++		zone.dir = NF_CT_DEFAULT_ZONE_DIR;
++
++		thash = nf_conntrack_find_get(cp->net, &zone, &tuple);
++		if (!thash)
++			goto out;
++
++		ct = nf_ct_tuplehash_to_ctrack(thash);
++	}
++
++	if (cp->mode & CTINFO_MODE_DSCP)
++		if (!cp->dscpstatemask || (ct->mark & cp->dscpstatemask))
++			tcf_ctinfo_dscp_set(ct, ca, cp, skb, wlen, proto);
++
++	if (cp->mode & CTINFO_MODE_CPMARK)
++		tcf_ctinfo_cpmark_set(ct, ca, cp, skb);
++
++	if (thash)
++		nf_ct_put(ct);
++out:
++	return action;
++}
++
++static const struct nla_policy ctinfo_policy[TCA_CTINFO_MAX + 1] = {
++	[TCA_CTINFO_ACT]		  = { .len = sizeof(struct
++							    tc_ctinfo) },
++	[TCA_CTINFO_ZONE]		  = { .type = NLA_U16 },
++	[TCA_CTINFO_PARMS_DSCP_MASK]	  = { .type = NLA_U32 },
++	[TCA_CTINFO_PARMS_DSCP_STATEMASK] = { .type = NLA_U32 },
++	[TCA_CTINFO_PARMS_CPMARK_MASK]	  = { .type = NLA_U32 },
++};
++
++static int tcf_ctinfo_init(struct net *net, struct nlattr *nla,
++			   struct nlattr *est, struct tc_action **a,
++			   int ovr, int bind, bool rtnl_held,
++			   struct netlink_ext_ack *extack)
++{
++	struct tc_action_net *tn = net_generic(net, ctinfo_net_id);
++	struct nlattr *tb[TCA_CTINFO_MAX + 1];
++	struct tcf_ctinfo_params *cp_new;
++/*	struct tcf_chain *goto_ch = NULL; */
++	u32 dscpmask = 0, dscpstatemask;
++	struct tc_ctinfo *actparm;
++	struct tcf_ctinfo *ci;
++	u8 dscpmaskshift;
++	int ret = 0, err;
++
++	if (!nla)
++		return -EINVAL;
++
++	err = nla_parse_nested(tb, TCA_CTINFO_MAX, nla, ctinfo_policy, NULL);
++	if (err < 0)
++		return err;
++
++	if (!tb[TCA_CTINFO_ACT])
++		return -EINVAL;
++	actparm = nla_data(tb[TCA_CTINFO_ACT]);
++
++	/* do some basic validation here before dynamically allocating things */
++	/* that we would otherwise have to clean up.			      */
++	if (tb[TCA_CTINFO_PARMS_DSCP_MASK]) {
++		dscpmask = nla_get_u32(tb[TCA_CTINFO_PARMS_DSCP_MASK]);
++		/* need contiguous 6 bit mask */
++		dscpmaskshift = dscpmask ? __ffs(dscpmask) : 0;
++		if ((~0 & (dscpmask >> dscpmaskshift)) != 0x3f)
++			return -EINVAL;
++		dscpstatemask = tb[TCA_CTINFO_PARMS_DSCP_STATEMASK] ?
++			nla_get_u32(tb[TCA_CTINFO_PARMS_DSCP_STATEMASK]) : 0;
++		/* mask & statemask must not overlap */
++		if (dscpmask & dscpstatemask)
++			return -EINVAL;
++	}
++
++	/* done the validation:now to the actual action allocation */
++	err = tcf_idr_check_alloc(tn, &actparm->index, a, bind);
++	if (!err) {
++		ret = tcf_idr_create(tn, actparm->index, est, a,
++				     &act_ctinfo_ops, bind, false);
++		if (ret) {
++			tcf_idr_cleanup(tn, actparm->index);
++			return ret;
++		}
++		ret = ACT_P_CREATED;
++	} else if (err > 0) {
++		if (bind) /* don't override defaults */
++			return 0;
++		if (!ovr) {
++			tcf_idr_release(*a, bind);
++			return -EEXIST;
++		}
++	} else {
++		return err;
++	}
++
++/*	err = tcf_action_check_ctrlact(actparm->action, tp, &goto_ch, extack);
++	if (err < 0)
++		goto release_idr;
++		*/
++
++	ci = to_ctinfo(*a);
++
++	cp_new = kzalloc(sizeof(*cp_new), GFP_KERNEL);
++	if (unlikely(!cp_new)) {
++		err = -ENOMEM;
++		goto put_chain;
++	}
++
++	cp_new->net = net;
++	cp_new->zone = tb[TCA_CTINFO_ZONE] ?
++			nla_get_u16(tb[TCA_CTINFO_ZONE]) : 0;
++	if (dscpmask) {
++		cp_new->dscpmask = dscpmask;
++		cp_new->dscpmaskshift = dscpmaskshift;
++		cp_new->dscpstatemask = dscpstatemask;
++		cp_new->mode |= CTINFO_MODE_DSCP;
++	}
++
++	if (tb[TCA_CTINFO_PARMS_CPMARK_MASK]) {
++		cp_new->cpmarkmask =
++				nla_get_u32(tb[TCA_CTINFO_PARMS_CPMARK_MASK]);
++		cp_new->mode |= CTINFO_MODE_CPMARK;
++	}
++
++	spin_lock_bh(&ci->tcf_lock);
++/*	goto_ch = tcf_action_set_ctrlact(*a, actparm->action, goto_ch); */
++	ci->tcf_action = actparm->action;
++	rcu_swap_protected(ci->params, cp_new,
++			   lockdep_is_held(&ci->tcf_lock));
++	spin_unlock_bh(&ci->tcf_lock);
++
++/*	if (goto_ch)
++		tcf_chain_put_by_act(goto_ch); */
++	if (cp_new)
++		kfree_rcu(cp_new, rcu);
++
++	if (ret == ACT_P_CREATED)
++		tcf_idr_insert(tn, *a);
++
++	return ret;
++
++put_chain:
++/*	if (goto_ch)
++		tcf_chain_put_by_act(goto_ch);
++release_idr: */
++	tcf_idr_release(*a, bind);
++	return err;
++}
++
++static int tcf_ctinfo_dump(struct sk_buff *skb, struct tc_action *a,
++			   int bind, int ref)
++{
++	struct tcf_ctinfo *ci = to_ctinfo(a);
++	struct tc_ctinfo opt = {
++		.index   = ci->tcf_index,
++		.refcnt  = refcount_read(&ci->tcf_refcnt) - ref,
++		.bindcnt = atomic_read(&ci->tcf_bindcnt) - bind,
++	};
++	unsigned char *b = skb_tail_pointer(skb);
++	struct tcf_ctinfo_params *cp;
++	struct tcf_t t;
++
++	spin_lock_bh(&ci->tcf_lock);
++	cp = rcu_dereference_protected(ci->params,
++				       lockdep_is_held(&ci->tcf_lock));
++
++	tcf_tm_dump(&t, &ci->tcf_tm);
++	if (nla_put_64bit(skb, TCA_CTINFO_TM, sizeof(t), &t, TCA_CTINFO_PAD))
++		goto nla_put_failure;
++
++	opt.action = ci->tcf_action;
++	if (nla_put(skb, TCA_CTINFO_ACT, sizeof(opt), &opt))
++		goto nla_put_failure;
++
++	if (nla_put_u16(skb, TCA_CTINFO_ZONE, cp->zone))
++		goto nla_put_failure;
++
++	if (cp->mode & CTINFO_MODE_DSCP) {
++		if (nla_put_u32(skb, TCA_CTINFO_PARMS_DSCP_MASK,
++				cp->dscpmask))
++			goto nla_put_failure;
++		if (nla_put_u32(skb, TCA_CTINFO_PARMS_DSCP_STATEMASK,
++				cp->dscpstatemask))
++			goto nla_put_failure;
++	}
++
++	if (cp->mode & CTINFO_MODE_CPMARK) {
++		if (nla_put_u32(skb, TCA_CTINFO_PARMS_CPMARK_MASK,
++				cp->cpmarkmask))
++			goto nla_put_failure;
++	}
++
++	if (nla_put_u64_64bit(skb, TCA_CTINFO_STATS_DSCP_SET,
++			      ci->stats_dscp_set, TCA_CTINFO_PAD))
++		goto nla_put_failure;
++
++	if (nla_put_u64_64bit(skb, TCA_CTINFO_STATS_DSCP_ERROR,
++			      ci->stats_dscp_error, TCA_CTINFO_PAD))
++		goto nla_put_failure;
++
++	if (nla_put_u64_64bit(skb, TCA_CTINFO_STATS_CPMARK_SET,
++			      ci->stats_cpmark_set, TCA_CTINFO_PAD))
++		goto nla_put_failure;
++
++	spin_unlock_bh(&ci->tcf_lock);
++	return skb->len;
++
++nla_put_failure:
++	spin_unlock_bh(&ci->tcf_lock);
++	nlmsg_trim(skb, b);
++	return -1;
++}
++
++static int tcf_ctinfo_walker(struct net *net, struct sk_buff *skb,
++			     struct netlink_callback *cb, int type,
++			     const struct tc_action_ops *ops,
++			     struct netlink_ext_ack *extack)
++{
++	struct tc_action_net *tn = net_generic(net, ctinfo_net_id);
++
++	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
++}
++
++static int tcf_ctinfo_search(struct net *net, struct tc_action **a, u32 index,
++			     struct netlink_ext_ack *extack)
++{
++	struct tc_action_net *tn = net_generic(net, ctinfo_net_id);
++
++	return tcf_idr_search(tn, a, index);
++}
++
++static struct tc_action_ops act_ctinfo_ops = {
++	.kind	= "ctinfo",
++	.type	= TCA_ID_CTINFO,
++	.owner	= THIS_MODULE,
++	.act	= tcf_ctinfo_act,
++	.dump	= tcf_ctinfo_dump,
++	.init	= tcf_ctinfo_init,
++	.walk	= tcf_ctinfo_walker,
++	.lookup	= tcf_ctinfo_search,
++	.size	= sizeof(struct tcf_ctinfo),
++};
++
++static __net_init int ctinfo_init_net(struct net *net)
++{
++	struct tc_action_net *tn = net_generic(net, ctinfo_net_id);
++
++	return tc_action_net_init(tn, &act_ctinfo_ops);
++}
++
++static void __net_exit ctinfo_exit_net(struct list_head *net_list)
++{
++	tc_action_net_exit(net_list, ctinfo_net_id);
++}
++
++static struct pernet_operations ctinfo_net_ops = {
++	.init		= ctinfo_init_net,
++	.exit_batch	= ctinfo_exit_net,
++	.id		= &ctinfo_net_id,
++	.size		= sizeof(struct tc_action_net),
++};
++
++static int __init ctinfo_init_module(void)
++{
++	return tcf_register_action(&act_ctinfo_ops, &ctinfo_net_ops);
++}
++
++static void __exit ctinfo_cleanup_module(void)
++{
++	tcf_unregister_action(&act_ctinfo_ops, &ctinfo_net_ops);
++}
++
++module_init(ctinfo_init_module);
++module_exit(ctinfo_cleanup_module);
++MODULE_AUTHOR("Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>");
++MODULE_DESCRIPTION("Connection tracking mark actions");
++MODULE_LICENSE("GPL");
+diff --git a/tools/testing/selftests/tc-testing/config b/tools/testing/selftests/tc-testing/config
+index 203302065458..9d1fddcfb887 100644
+--- a/tools/testing/selftests/tc-testing/config
++++ b/tools/testing/selftests/tc-testing/config
+@@ -37,6 +37,7 @@ CONFIG_NET_ACT_SKBEDIT=m
+ CONFIG_NET_ACT_CSUM=m
+ CONFIG_NET_ACT_VLAN=m
+ CONFIG_NET_ACT_BPF=m
++CONFIG_NET_ACT_CONNDSCP=m
+ CONFIG_NET_ACT_CONNMARK=m
+ CONFIG_NET_ACT_SKBMOD=m
+ CONFIG_NET_ACT_IFE=m
+-- 
+2.20.1 (Apple Git-117)
+