/* SPDX-License-Identifier: GPL-2.0 */#ifndef _NET_PPTP_H#define _NET_PPTP_H #include <linux/types.h>#include <net/gre.h> #define PPP_LCP_ECHOREQ 0x09#define PPP_LCP_ECHOREP 0x0A#define SC_RCV_BITS     (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP) #define MISSING_WINDOW 20#define WRAPPED(curseq, lastseq)\	((((curseq) & 0xffffff00) == 0) &&\	(((lastseq) & 0xffffff00) == 0xffffff00)) #define PPTP_HEADER_OVERHEAD (2+sizeof(struct pptp_gre_header))struct pptp_gre_header {	struct gre_base_hdr gre_hd;	__be16 payload_len;	__be16 call_id;	__be32 seq;	__be32 ack;} __packed;  #endif