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/*
* pptpgre.h
*
* Functions to handle the GRE en/decapsulation
*
* $Id: pptpgre.h,v 1.3 2005/08/02 11:33:31 quozl Exp $
*/
#ifndef _PPTPD_PPTPGRE_H
#define _PPTPD_PPTPGRE_H
extern int decaps_hdlc(int fd, int (*cb) (int cl, void *pack, unsigned len), int cl);
extern int encaps_hdlc(int fd, void *pack, unsigned len);
extern int decaps_gre(int fd, int (*cb) (int cl, void *pack, unsigned len), int cl);
extern int encaps_gre(int fd, void *pack, unsigned len);
extern int pptp_gre_init(u_int32_t call_id_pair, int pty_fd, struct in_addr *inetaddrs);
struct gre_state {
u_int32_t ack_sent, ack_recv;
u_int32_t seq_sent, seq_recv;
u_int32_t call_id_pair;
};
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;
#endif /* !_PPTPD_PPTPGRE_H */
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