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