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/* pptp_gre.h -- encapsulate PPP in PPTP-GRE.
* Handle the IP Protocol 47 portion of PPTP.
* C. Scott Ananian <cananian@alumni.princeton.edu>
*
* $Id: pptp_gre.h,v 1.5 2004/06/09 00:13:32 quozl Exp $
*/
int pptp_gre_bind(struct in_addr inetaddr);
void pptp_gre_copy(u_int16_t call_id, u_int16_t peer_call_id,
int pty_fd, int gre_fd);
extern int syncppp;
extern int disable_buffer;
typedef struct pack_track {
uint32_t seq; // seq no of this tracked packet
uint64_t time; // time when this tracked packet was sent (in usecs)
} pack_track_t;
typedef struct gre_stats {
/* statistics for GRE receive */
uint32_t rx_accepted; // data packet was passed to pppd
uint32_t rx_lost; // data packet did not arrive before timeout
uint32_t rx_underwin; // data packet was under window (arrived too late
// or duplicate packet)
uint32_t rx_overwin; // data packet was over window
// (too many packets lost?)
uint32_t rx_buffered; // data packet arrived earlier than expected,
// packet(s) before it were lost or reordered
uint32_t rx_errors; // OS error on receive
uint32_t rx_truncated; // truncated packet
uint32_t rx_invalid; // wrong protocol or invalid flags
uint32_t rx_acks; // acknowledgement only
/* statistics for GRE transmit */
uint32_t tx_sent; // data packet write() to GRE socket succeeded
uint32_t tx_failed; // data packet write() to GRE socket returned error
uint32_t tx_short; // data packet write() to GRE socket underflowed
uint32_t tx_acks; // sent packet with just ACK
uint32_t tx_oversize; // data packet dropped because it was too large
/* statistics for packet tracking, for RTT calculation */
pack_track_t pt; // last data packet seq/time
int rtt; // estimated round-trip time in us
} gre_stats_t;
extern gre_stats_t stats;
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