--- a/include/linux/ppp_channel.h
+++ b/include/linux/ppp_channel.h
@@ -45,6 +56,47 @@ struct ppp_channel {
 };
 
 #ifdef __KERNEL__
+/* Call this to obtain the underlying protocol of the PPP channel,
+ * e.g. PX_PROTO_OE
+ */
+extern int ppp_channel_get_protocol(struct ppp_channel *);
+
+/* Call this to hold a channel */
+extern bool ppp_channel_hold(struct ppp_channel *);
+
+/* Call this to release a hold you have upon a channel */
+extern void ppp_channel_release(struct ppp_channel *);
+
+/* Release hold on PPP channels */
+extern void ppp_release_channels(struct ppp_channel *channels[],
+                                 unsigned int chan_sz);
+
+/* Test if ppp xmit lock is locked */
+extern bool ppp_is_xmit_locked(struct net_device *dev);
+
+/* Call this get protocol version */
+extern int ppp_channel_get_proto_version(struct ppp_channel *);
+
+/* Get the device index  associated with a channel, or 0, if none */
+extern int ppp_dev_index(struct ppp_channel *);
+
+/* Hold PPP channels for the PPP device */
+extern int ppp_hold_channels(struct net_device *dev,
+                             struct ppp_channel *channels[],
+                             unsigned int chan_sz);
+
+/* Test if the ppp device is a multi-link ppp device */
+extern int ppp_is_multilink(struct net_device *dev);
+
+/* Update statistics of the PPP net_device by incrementing related
+ * statistics field value with corresponding parameter
+ */
+extern void ppp_update_stats(struct net_device *dev, unsigned long rx_packets,
+                             unsigned long rx_bytes, unsigned long tx_packets,
+                             unsigned long tx_bytes, unsigned long rx_errors,
+                             unsigned long tx_errors, unsigned long rx_dropped,
+                             unsigned long tx_dropped);
+
 /* Called by the channel when it can send some more data. */
 extern void ppp_output_wakeup(struct ppp_channel *);
 
@@ -83,5 +135,17 @@ extern char *ppp_dev_name(struct ppp_cha
  * that ppp_unregister_channel returns.
  */
 
+/* QCA NSS Clients Support - Start */
+/* PPP channel connection event types */
+#define PPP_CHANNEL_DISCONNECT  0
+#define PPP_CHANNEL_CONNECT     1
+
+/* Register the PPP channel connect notifier */
+extern void ppp_channel_connection_register_notify(struct notifier_block *nb);
+
+/* Unregister the PPP channel connect notifier */
+extern void ppp_channel_connection_unregister_notify(struct notifier_block *nb);
+/* QCA NSS Clients Support - End */
+
 #endif /* __KERNEL__ */
 #endif
--- a/include/linux/if_pppol2tp.h
+++ b/include/linux/if_pppol2tp.h
@@ -14,4 +14,30 @@
 #include <linux/in6.h>
 #include <uapi/linux/if_pppol2tp.h>
 
+/* QCA NSS ECM support - Start */
+/*
+ * Holds L2TP channel info
+ */
+struct  pppol2tp_common_addr {
+	int tunnel_version;				/* v2 or v3 */
+	__u32 local_tunnel_id, remote_tunnel_id;	/* tunnel id */
+	__u32 local_session_id, remote_session_id;	/* session id */
+	struct sockaddr_in local_addr, remote_addr; /* ip address and port */
+};
+
+/*
+ * L2TP channel operations
+ */
+struct pppol2tp_channel_ops {
+	struct ppp_channel_ops ops; /* ppp channel ops */
+};
+
+/*
+ * exported function which calls pppol2tp channel's get addressing
+ * function
+ */
+extern int pppol2tp_channel_addressing_get(struct ppp_channel *,
+					   struct pppol2tp_common_addr *);
+/* QCA NSS ECM support - End */
+
 #endif
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -380,6 +392,13 @@ static int pppol2tp_xmit(struct ppp_chan
 	skb->data[0] = PPP_ALLSTATIONS;
 	skb->data[1] = PPP_UI;
 
+	/* QCA NSS ECM support - start */
+	/* set incoming interface as the ppp interface */
+	if ((skb->protocol == htons(ETH_P_IP)) ||
+	    (skb->protocol == htons(ETH_P_IPV6)))
+		skb->skb_iif = ppp_dev_index(chan);
+	/* QCA NSS ECM support - End */
+
 	local_bh_disable();
 	l2tp_xmit_skb(session, skb, session->hdr_len);
 	local_bh_enable();
@@ -1749,6 +1768,109 @@ static void __exit pppol2tp_exit(void)
 	unregister_pernet_device(&pppol2tp_net_ops);
 }
 
+/* QCA NSS ECM support - Start */
+/* pppol2tp_hold_chan() */
+static void pppol2tp_hold_chan(struct ppp_channel *chan)
+{
+	struct sock *sk = (struct sock *)chan->private;
+
+	sock_hold(sk);
+}
+
+/* pppol2tp_release_chan() */
+static void pppol2tp_release_chan(struct ppp_channel *chan)
+{
+	struct sock *sk = (struct sock *)chan->private;
+
+	sock_put(sk);
+}
+
+/* pppol2tp_get_channel_protocol()
+ * Return the protocol type of the L2TP over PPP protocol
+ */
+static int pppol2tp_get_channel_protocol(struct ppp_channel *chan)
+{
+	return PX_PROTO_OL2TP;
+}
+
+/* pppol2tp_get_channel_protocol_ver()
+ * Return the protocol version of the L2TP over PPP protocol
+ */
+static int pppol2tp_get_channel_protocol_ver(struct ppp_channel *chan)
+{
+	struct sock *sk;
+	struct l2tp_session *session;
+	struct l2tp_tunnel *tunnel;
+	int version = 0;
+
+	if (chan && chan->private)
+		sk = (struct sock *)chan->private;
+	else
+		return -1;
+
+	/* Get session and tunnel contexts from the socket */
+	session = pppol2tp_sock_to_session(sk);
+	if (!session)
+		return -1;
+
+	tunnel = session->tunnel;
+	if (!tunnel) {
+		sock_put(sk);
+		return -1;
+	}
+
+	version = tunnel->version;
+
+	sock_put(sk);
+
+	return version;
+}
+
+/* pppol2tp_get_addressing() */
+static int pppol2tp_get_addressing(struct ppp_channel *chan,
+				   struct pppol2tp_common_addr *addr)
+{
+	struct sock *sk = (struct sock *)chan->private;
+	struct l2tp_session *session;
+	struct l2tp_tunnel *tunnel;
+	struct inet_sock *isk = NULL;
+	int err = -ENXIO;
+
+	/* Get session and tunnel contexts from the socket */
+	session = pppol2tp_sock_to_session(sk);
+	if (!session)
+		return err;
+
+	tunnel = session->tunnel;
+	if (!tunnel) {
+		sock_put(sk);
+		return err;
+	}
+	isk = inet_sk(tunnel->sock);
+
+	addr->local_tunnel_id = tunnel->tunnel_id;
+	addr->remote_tunnel_id = tunnel->peer_tunnel_id;
+	addr->local_session_id = session->session_id;
+	addr->remote_session_id = session->peer_session_id;
+
+	addr->local_addr.sin_port = isk->inet_sport;
+	addr->remote_addr.sin_port = isk->inet_dport;
+	addr->local_addr.sin_addr.s_addr = isk->inet_saddr;
+	addr->remote_addr.sin_addr.s_addr = isk->inet_daddr;
+
+	sock_put(sk);
+	return 0;
+}
+
+/* pppol2tp_channel_addressing_get() */
+int pppol2tp_channel_addressing_get(struct ppp_channel *chan,
+				    struct pppol2tp_common_addr *addr)
+{
+	return pppol2tp_get_addressing(chan, addr);
+}
+EXPORT_SYMBOL(pppol2tp_channel_addressing_get);
+/* QCA NSS ECM support - End */
+
 module_init(pppol2tp_init);
 module_exit(pppol2tp_exit);
 
*** a/drivers/net/ppp/ppp_generic.c	2022-04-06 17:25:52.144576100 +0900
--- b/drivers/net/ppp/ppp_generic.c	2022-04-06 17:32:55.164576100 +0900
*************** int ppp_is_multilink(struct net_device *
*** 3502,3507 ****
--- 3502,3533 ----
  }
  EXPORT_SYMBOL(ppp_is_multilink);
  
+ /* __ppp_is_multilink()
+  *      Returns >0 if the device is a multilink PPP netdevice, 0 if not or < 0
+  *      if the device is not PPP. Caller should acquire ppp_lock before calling
+  *      this function
+  */
+ int __ppp_is_multilink(struct net_device *dev)
+ {
+ 	struct ppp *ppp;
+ 	unsigned int flags;
+ 
+ 	if (!dev)
+ 		return -1;
+ 
+ 	if (dev->type != ARPHRD_PPP)
+ 		return -1;
+ 
+ 	ppp = netdev_priv(dev);
+ 	flags = ppp->flags;
+ 
+ 	if (flags & SC_MULTILINK)
+ 		return 1;
+ 
+ 	return 0;
+ }
+ EXPORT_SYMBOL(__ppp_is_multilink);
+ 
  /* ppp_channel_get_protocol()
   *	Call this to obtain the underlying protocol of the PPP channel,
   *	e.g. PX_PROTO_OE
*************** int ppp_hold_channels(struct net_device
*** 3606,3611 ****
--- 3632,3690 ----
  }
  EXPORT_SYMBOL(ppp_hold_channels);
  
+ /* __ppp_hold_channels()
+  *	Returns the PPP channels of the PPP device, storing each one into
+  *	channels[].
+  *
+  * channels[] has chan_sz elements.
+  * This function returns the number of channels stored, up to chan_sz.
+  * It will return < 0 if the device is not PPP.
+  *
+  * You MUST release the channels using ppp_release_channels().
+  */
+ int __ppp_hold_channels(struct net_device *dev, struct ppp_channel *channels[],
+ 		      unsigned int chan_sz)
+ {
+ 	struct ppp *ppp;
+ 	int c;
+ 	struct channel *pch;
+ 
+ 	if (!dev)
+ 		return -1;
+ 
+ 	if (dev->type != ARPHRD_PPP)
+ 		return -1;
+ 
+ 	ppp = netdev_priv(dev);
+ 
+ 	c = 0;
+ 	list_for_each_entry(pch, &ppp->channels, clist) {
+ 		struct ppp_channel *chan;
+ 
+ 		if (!pch->chan) {
+ 			/* Channel is going / gone away */
+ 			continue;
+ 		}
+ 
+ 		if (c == chan_sz) {
+ 			/* No space to record channel */
+ 			return c;
+ 		}
+ 
+ 		/* Hold the channel, if supported */
+ 		chan = pch->chan;
+ 		if (!chan->ops->hold)
+ 			continue;
+ 
+ 		chan->ops->hold(chan);
+ 
+ 		 /* Record the channel */
+ 		channels[c++] = chan;
+ 	}
+ 	return c;
+ }
+ EXPORT_SYMBOL(__ppp_hold_channels);
+ 
  /* ppp_release_channels()
   *	Releases channels
   */
*** a/include/linux/ppp_channel.h	2022-04-06 17:35:39.524576100 +0900
--- b/include/linux/ppp_channel.h	2022-04-06 17:36:10.684576100 +0900
*************** extern void ppp_release_channels(struct
*** 110,121 ****
--- 110,126 ----
  extern int ppp_hold_channels(struct net_device *dev,
  				struct ppp_channel *channels[],
  				unsigned int chan_sz);
+ extern int __ppp_hold_channels(struct net_device *dev,
+ 				struct ppp_channel *channels[],
+ 				unsigned int chan_sz);
+ 
  
  /* Test if ppp xmit lock is locked */
  extern bool ppp_is_xmit_locked(struct net_device *dev);
  
  /* Test if the ppp device is a multi-link ppp device */
  extern int ppp_is_multilink(struct net_device *dev);
+ extern int __ppp_is_multilink(struct net_device *dev);
  
  /* Register the PPP channel connect notifier */
  extern void ppp_channel_connection_register_notify(struct notifier_block *nb);