1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NET_PPTP_H
3 #define _NET_PPTP_H
4 
5 #include <linux/types.h>
6 #include <net/gre.h>
7 
8 #define PPP_LCP_ECHOREQ 0x09
9 #define PPP_LCP_ECHOREP 0x0A
10 #define SC_RCV_BITS     (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP)
11 
12 #define MISSING_WINDOW 20
13 #define WRAPPED(curseq, lastseq)\
14 	((((curseq) & 0xffffff00) == 0) &&\
15 	(((lastseq) & 0xffffff00) == 0xffffff00))
16 
17 #define PPTP_HEADER_OVERHEAD (2+sizeof(struct pptp_gre_header))
18 struct pptp_gre_header {
19 	struct gre_base_hdr gre_hd;
20 	__be16 payload_len;
21 	__be16 call_id;
22 	__be32 seq;
23 	__be32 ack;
24 } __packed;
25 
26 
27 #endif
28