--- zzzz-none-000/linux-4.4.271/include/linux/if_pppox.h	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/include/linux/if_pppox.h	2023-04-19 10:22:30.000000000 +0000
@@ -1,6 +1,22 @@
+/*
+ **************************************************************************
+ * Copyright (c) 2016, The Linux Foundation.  All rights reserved.
+ * Permission to use, copy, modify, and/or distribute this software for
+ * any purpose with or without fee is hereby granted, provided that the
+ * above copyright notice and this permission notice appear in all copies.
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+ * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ **************************************************************************
+ */
+
 /***************************************************************************
  * Linux PPP over X - Generic PPP transport layer sockets
- * Linux PPP over Ethernet (PPPoE) Socket Implementation (RFC 2516) 
+ * Linux PPP over Ethernet (PPPoE) Socket Implementation (RFC 2516)
  *
  * This file supplies definitions required by the PPP over Ethernet driver
  * (pppox.c).  All version information wrt this file is located in pppox.c
@@ -12,6 +28,7 @@
  *		2 of the License, or (at your option) any later version.
  *
  */
+
 #ifndef __LINUX_IF_PPPOX_H
 #define __LINUX_IF_PPPOX_H
 
@@ -42,6 +59,7 @@
 	u32 ack_sent, ack_recv;
 	u32 seq_sent, seq_recv;
 	int ppp_flags;
+	bool pptp_offload_mode;
 };
 #include <net/sock.h>
 
@@ -98,4 +116,49 @@
     PPPOX_DEAD		= 16  /* dead, useless, please clean me up!*/
 };
 
+/*
+ * PPPoE Channel specific operations
+ */
+struct pppoe_channel_ops {
+	/* Must be first - general to all PPP channels */
+	struct ppp_channel_ops ops;
+	int (*get_addressing)(struct ppp_channel *, struct pppoe_opt *);
+};
+
+/* PPTP client callback */
+typedef int (*pptp_gre_seq_offload_callback_t)(struct sk_buff *skb,
+					       struct net_device *pptp_dev);
+
+/* Return PPPoE channel specific addressing information */
+extern int pppoe_channel_addressing_get(struct ppp_channel *chan,
+					 struct pppoe_opt *addressing);
+
+/* Lookup PPTP session info and return PPTP session using dip and peer call id */
+extern int pptp_session_find(struct pptp_opt *opt, __be16 peer_call_id,
+			     __be32 peer_ip_addr);
+
+/* Lookup PPTP session info and return PPTP session using sip, dip and local call id */
+extern int pptp_session_find_by_src_callid(struct pptp_opt *opt, __be16 src_call_id,
+			 __be32 daddr, __be32 saddr);
+
+/* Return PPTP session information given the channel */
+extern void pptp_channel_addressing_get(struct pptp_opt *opt,
+					struct ppp_channel *chan);
+
+/* Enable the PPTP session offload flag */
+extern int pptp_session_enable_offload_mode(__be16 peer_call_id,
+					    __be32 peer_ip_addr);
+
+/* Disable the PPTP session offload flag */
+extern int pptp_session_disable_offload_mode(__be16 peer_call_id,
+					     __be32 peer_ip_addr);
+
+/* Register the PPTP GRE packets sequence number offload callback */
+extern int
+pptp_register_gre_seq_offload_callback(pptp_gre_seq_offload_callback_t
+				       pptp_client_cb);
+
+/* Unregister the PPTP GRE packets sequence number offload callback */
+extern void pptp_unregister_gre_seq_offload_callback(void);
+
 #endif /* !(__LINUX_IF_PPPOX_H) */