release/src/router/pptpd/pptpgre.h

   1 /*
   2  * pptpgre.h
   3  *
   4  * Functions to handle the GRE en/decapsulation
   5  *
   6  * $Id: pptpgre.h,v 1.3 2005/08/02 11:33:31 quozl Exp $
   7  */
   8
   9 #ifndef _PPTPD_PPTPGRE_H
  10 #define _PPTPD_PPTPGRE_H
  11
  12 extern int decaps_hdlc(int fd, int (*cb) (int cl, void *pack, unsigned len), int cl);
  13 extern int encaps_hdlc(int fd, void *pack, unsigned len);
  14 extern int decaps_gre(int fd, int (*cb) (int cl, void *pack, unsigned len), int cl);
  15 extern int encaps_gre(int fd, void *pack, unsigned len);
  16
  17 extern int pptp_gre_init(u_int32_t call_id_pair, int pty_fd, struct in_addr *inetaddrs);
  18
  19 struct gre_state {
  20         u_int32_t ack_sent, ack_recv;
  21         u_int32_t seq_sent, seq_recv;
  22         u_int32_t call_id_pair;
  23 };
  24
  25 extern int disable_buffer;
  26
  27 typedef struct pack_track {
  28   uint32_t seq;       // seq no of this tracked packet
  29   uint64_t time;      // time when this tracked packet was sent (in usecs)
  30 } pack_track_t;
  31
  32 typedef struct gre_stats {
  33   /* statistics for GRE receive */
  34
  35   uint32_t rx_accepted;  // data packet was passed to pppd
  36   uint32_t rx_lost;      // data packet did not arrive before timeout
  37   uint32_t rx_underwin;  // data packet was under window (arrived too late
  38                          // or duplicate packet)
  39   uint32_t rx_overwin;   // data packet was over window
  40                          // (too many packets lost?)
  41   uint32_t rx_buffered;  // data packet arrived earlier than expected,
  42                          // packet(s) before it were lost or reordered
  43   uint32_t rx_errors;    // OS error on receive
  44   uint32_t rx_truncated; // truncated packet
  45   uint32_t rx_invalid;   // wrong protocol or invalid flags
  46   uint32_t rx_acks;      // acknowledgement only
  47
  48   /* statistics for GRE transmit */
  49
  50   uint32_t tx_sent;      // data packet write() to GRE socket succeeded
  51   uint32_t tx_failed;    // data packet write() to GRE socket returned error
  52   uint32_t tx_short;     // data packet write() to GRE socket underflowed
  53   uint32_t tx_acks;      // sent packet with just ACK
  54   uint32_t tx_oversize;  // data packet dropped because it was too large
  55
  56   /* statistics for packet tracking, for RTT calculation */
  57
  58   pack_track_t pt;       // last data packet seq/time
  59   int rtt;               // estimated round-trip time in us
  60
  61 } gre_stats_t;
  62
  63 extern gre_stats_t stats;
  64
  65 #endif  /* !_PPTPD_PPTPGRE_H */