--- a/include/net/netns/conntrack.h
+++ b/include/net/netns/conntrack.h
@@ -113,6 +113,9 @@ struct netns_ct {
 
 	struct ct_pcpu __percpu *pcpu_lists;
 	struct ip_conntrack_stat __percpu *stat;
+#ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
+	struct atomic_notifier_head nf_conntrack_chain;
+#endif
 	struct nf_ct_event_notifier __rcu *nf_conntrack_event_cb;
 	struct nf_ip_net	nf_ct_proto;
 #if defined(CONFIG_NF_CONNTRACK_LABELS)
--- a/include/net/netfilter/nf_conntrack_ecache.h
+++ b/include/net/netfilter/nf_conntrack_ecache.h
@@ -78,6 +78,11 @@ struct nf_exp_event {
 	int report;
 };
 
+#ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
+extern int nf_conntrack_register_chain_notifier(struct net *net, struct notifier_block *nb);
+extern int nf_conntrack_unregister_chain_notifier(struct net *net, struct notifier_block *nb);
+#endif
+
 struct nf_ct_event_notifier {
 	int (*ct_event)(unsigned int events, const struct nf_ct_event *item);
 	int (*exp_event)(unsigned int events, const struct nf_exp_event *item);
@@ -111,11 +116,13 @@ static inline void
 nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
 {
 #ifdef CONFIG_NF_CONNTRACK_EVENTS
-	struct net *net = nf_ct_net(ct);
 	struct nf_conntrack_ecache *e;
+#ifndef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
+	struct net *net = nf_ct_net(ct);
 
 	if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
 		return;
+#endif
 
 	e = nf_ct_ecache_find(ct);
 	if (e == NULL)
@@ -130,10 +137,12 @@ nf_conntrack_event_report(enum ip_conntr
 			  u32 portid, int report)
 {
 #ifdef CONFIG_NF_CONNTRACK_EVENTS
+#ifndef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
 	const struct net *net = nf_ct_net(ct);
 
 	if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
 		return 0;
+#endif
 
 	return nf_conntrack_eventmask_report(1 << event, ct, portid, report);
 #else
@@ -145,10 +154,12 @@ static inline int
 nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
 {
 #ifdef CONFIG_NF_CONNTRACK_EVENTS
+#ifndef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
 	const struct net *net = nf_ct_net(ct);
 
 	if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
 		return 0;
+#endif
 
 	return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
 #else
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -160,6 +160,21 @@ config NF_CONNTRACK_TIMEOUT
 
 	  If unsure, say `N'.
 
+config NF_CONNTRACK_DSCPREMARK_EXT
+	bool  'Connection tracking extension for dscp remark target'
+	depends on NETFILTER_ADVANCED
+	help
+	  This option enables support for connection tracking extension
+	  for dscp remark.
+
+config NF_CONNTRACK_CHAIN_EVENTS
+	bool "Register multiple callbacks to ct events"
+	depends on NF_CONNTRACK_EVENTS
+	help
+	  Support multiple registrations.
+
+	  If unsure, say `N'.
+
 config NF_CONNTRACK_TIMESTAMP
 	bool  'Connection tracking timestamping'
 	depends on NETFILTER_ADVANCED
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -2899,6 +2899,9 @@ int nf_conntrack_init_net(struct net *ne
 	nf_conntrack_ecache_pernet_init(net);
 	nf_conntrack_helper_pernet_init(net);
 	nf_conntrack_proto_pernet_init(net);
+#ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
+	ATOMIC_INIT_NOTIFIER_HEAD(&net->ct.nf_conntrack_chain);
+#endif
 
 	return 0;
 
--- a/net/netfilter/nf_conntrack_ecache.c
+++ b/net/netfilter/nf_conntrack_ecache.c
@@ -17,6 +17,9 @@
 #include <linux/stddef.h>
 #include <linux/err.h>
 #include <linux/percpu.h>
+#ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
+#include <linux/notifier.h>
+#endif
 #include <linux/kernel.h>
 #include <linux/netdevice.h>
 #include <linux/slab.h>
@@ -150,8 +153,15 @@ static int __nf_conntrack_eventmask_repo
 		rcu_read_unlock();
 		return 0;
 	}
-
+#ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
+	ret = atomic_notifier_call_chain(&net->ct.nf_conntrack_chain,
+		events | missed, &item);
+
+	if (notify)
+	  ret = notify->ct_event(events | missed, item);
+#else
 	ret = notify->ct_event(events | missed, item);
+#endif
 	rcu_read_unlock();
 
 	if (likely(ret >= 0 && missed == 0))
@@ -245,7 +255,11 @@ void nf_ct_expect_event_report(enum ip_c
 
 	rcu_read_lock();
 	notify = rcu_dereference(net->ct.nf_conntrack_event_cb);
+#ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
+	if (!notify && !rcu_dereference_raw(net->ct.nf_conntrack_chain.head))
+#else
 	if (!notify)
+#endif
 		goto out_unlock;
 
 	e = nf_ct_ecache_find(exp->master);
@@ -264,6 +278,14 @@ out_unlock:
 	rcu_read_unlock();
 }
 
+#ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
+int nf_conntrack_register_chain_notifier(struct net *net, struct notifier_block *nb)
+{
+	return atomic_notifier_chain_register(&net->ct.nf_conntrack_chain, nb);
+}
+EXPORT_SYMBOL_GPL(nf_conntrack_register_chain_notifier);
+#endif
+
 void nf_conntrack_register_notifier(struct net *net,
 				    const struct nf_ct_event_notifier *new)
 {
@@ -278,6 +300,14 @@ void nf_conntrack_register_notifier(stru
 }
 EXPORT_SYMBOL_GPL(nf_conntrack_register_notifier);
 
+#ifdef CONFIG_NF_CONNTRACK_CHAIN_EVENTS
+int nf_conntrack_unregister_chain_notifier(struct net *net, struct notifier_block *nb)
+{
+	return atomic_notifier_chain_unregister(&net->ct.nf_conntrack_chain, nb);
+}
+EXPORT_SYMBOL_GPL(nf_conntrack_unregister_chain_notifier);
+#endif
+
 void nf_conntrack_unregister_notifier(struct net *net)
 {
 	mutex_lock(&nf_ct_ecache_mutex);
--- a/include/net/netfilter/nf_conntrack_extend.h
+++ b/include/net/netfilter/nf_conntrack_extend.h
@@ -28,6 +28,10 @@ enum nf_ct_ext_id {
 #if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
 	NF_CT_EXT_SYNPROXY,
 #endif
+#ifdef CONFIG_NF_CONNTRACK_DSCPREMARK_EXT
+	NF_CT_EXT_DSCPREMARK,   /* QCA NSS ECM support */
+#endif
+
 	NF_CT_EXT_NUM,
 };
 
@@ -40,6 +44,9 @@ enum nf_ct_ext_id {
 #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
+/* QCA NSS ECM support - Start */
+#define NF_CT_EXT_DSCPREMARK_TYPE struct nf_ct_dscpremark_ext
+/* QCA NSS ECM support - End */
 
 /* Extensions: optional stuff which isn't permanently in struct. */
 struct nf_ct_ext {
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -14,6 +14,7 @@ nf_conntrack-$(CONFIG_NF_CONNTRACK_LABEL
 nf_conntrack-$(CONFIG_NF_CT_PROTO_DCCP) += nf_conntrack_proto_dccp.o
 nf_conntrack-$(CONFIG_NF_CT_PROTO_SCTP) += nf_conntrack_proto_sctp.o
 nf_conntrack-$(CONFIG_NF_CT_PROTO_GRE) += nf_conntrack_proto_gre.o
+nf_conntrack-$(CONFIG_NF_CONNTRACK_DSCPREMARK_EXT) += nf_conntrack_dscpremark_ext.o
 
 obj-$(CONFIG_NETFILTER) = netfilter.o