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/*
* Interface declaration of the VJ compression code
*
* Matthias Welwarsky (DG2FEF) 05/25/98
*/
#ifndef _AX25_VJ_H
#define _AX25_VJ_H
#include <net/ip.h>
#include <net/tcp.h>
/*
* MW: copied this into ax25.h to unclobber the original struct cstate.
* "state" data for each active tcp conversation on the "wire". This is
* basically a copy of the entire IP/TCP header from the last packet
* we saw from the conversation together with a small identifier
* the transmit & receive ends of the line use to locate saved header.
*/
struct axvj_cstate {
unsigned char cs_this; /* connection id number (xmit) */
struct axvj_cstate *next; /* next in ring (xmit) */
struct iphdr cs_ip; /* ip/tcp hdr from most recent packet */
struct tcphdr cs_tcp;
unsigned char cs_ipopt[64];
unsigned char cs_tcpopt[64];
int cs_hsize;
unsigned char deny_compression; /* MW: for vj compression via AX.25 */
unsigned long lastdropped;
};
/*
* all the state data for one VC (we need one of these per VC).
*/
struct axvj_slcomp {
struct axvj_cstate *tstate; /* transmit connection states (array)*/
struct axvj_cstate *rstate; /* receive connection states (array)*/
unsigned char tslot_limit; /* highest transmit slot id (0-l)*/
unsigned char rslot_limit; /* highest receive slot id (0-l)*/
unsigned char xmit_oldest; /* oldest xmit in ring */
unsigned char xmit_current; /* most recent xmit id */
unsigned char recv_current; /* most recent rcvd id */
unsigned char flags;
#define SLF_TOSS 0x01 /* tossing rcvd frames until id received */
int sls_o_nontcp; /* outbound non-TCP packets */
int sls_o_tcp; /* outbound TCP packets */
int sls_o_uncompressed; /* outbound uncompressed packets */
int sls_o_compressed; /* outbound compressed packets */
int sls_o_searches; /* searches for connection state */
int sls_o_misses; /* times couldn't find conn. state */
int sls_i_uncompressed; /* inbound uncompressed packets */
int sls_i_compressed; /* inbound compressed packets */
int sls_i_error; /* inbound error packets */
int sls_i_tossed; /* inbound packets tossed because of error */
int sls_i_runt;
int sls_i_badcheck;
};
extern struct axvj_slcomp* axhc_init(int, int);
extern void axhc_free(struct axvj_slcomp*);
extern int axhc_compress(struct axvj_slcomp *comp, struct sk_buff *skb, int do_compression);
extern void ax25_vj_init(void);
extern void ax25_vj_cleanup(void);
extern int axhc_uncompress(struct axvj_slcomp *comp, struct sk_buff *skb);
extern int axhc_remember(struct axvj_slcomp *comp, struct sk_buff *skb);
#endif
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