release/src/router/pptp-client/pptp_gre.h

   1 /* pptp_gre.h -- encapsulate PPP in PPTP-GRE.
   2  *               Handle the IP Protocol 47 portion of PPTP.
   3  *               C. Scott Ananian <cananian@alumni.princeton.edu>
   4  *
   5  * $Id: pptp_gre.h,v 1.5 2004/06/09 00:13:32 quozl Exp $
   6  */
   7
   8 int pptp_gre_bind(struct in_addr inetaddr);
   9 void pptp_gre_copy(u_int16_t call_id, u_int16_t peer_call_id,
  10                    int pty_fd, int gre_fd);
  11
  12 extern int syncppp;
  13 extern int disable_buffer;
  14
  15 typedef struct pack_track {
  16   uint32_t seq;       // seq no of this tracked packet
  17   uint64_t time;      // time when this tracked packet was sent (in usecs)
  18 } pack_track_t;
  19
  20 typedef struct gre_stats {
  21   /* statistics for GRE receive */
  22
  23   uint32_t rx_accepted;  // data packet was passed to pppd
  24   uint32_t rx_lost;      // data packet did not arrive before timeout
  25   uint32_t rx_underwin;  // data packet was under window (arrived too late
  26                          // or duplicate packet)
  27   uint32_t rx_overwin;   // data packet was over window
  28                          // (too many packets lost?)
  29   uint32_t rx_buffered;  // data packet arrived earlier than expected,
  30                          // packet(s) before it were lost or reordered
  31   uint32_t rx_errors;    // OS error on receive
  32   uint32_t rx_truncated; // truncated packet
  33   uint32_t rx_invalid;   // wrong protocol or invalid flags
  34   uint32_t rx_acks;      // acknowledgement only
  35
  36   /* statistics for GRE transmit */
  37
  38   uint32_t tx_sent;      // data packet write() to GRE socket succeeded
  39   uint32_t tx_failed;    // data packet write() to GRE socket returned error
  40   uint32_t tx_short;     // data packet write() to GRE socket underflowed
  41   uint32_t tx_acks;      // sent packet with just ACK
  42   uint32_t tx_oversize;  // data packet dropped because it was too large
  43
  44   /* statistics for packet tracking, for RTT calculation */
  45
  46   pack_track_t pt;       // last data packet seq/time
  47   int rtt;               // estimated round-trip time in us
  48
  49 } gre_stats_t;
  50
  51 extern gre_stats_t stats;