include/net/pptp.h

   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