diff options
Diffstat (limited to 'net/ax25/ax25_vj.h')
| -rw-r--r-- | net/ax25/ax25_vj.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/net/ax25/ax25_vj.h b/net/ax25/ax25_vj.h new file mode 100644 index 000000000..da059392c --- /dev/null +++ b/net/ax25/ax25_vj.h @@ -0,0 +1,73 @@ +/* + * 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 |