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