AX25.H

 /* Mods by G1EMM */
#ifndef _AX25_H
#define _AX25_H
  
#ifndef _GLOBAL_H
#include "global.h"
#endif
  
#ifndef _IP_H
#include "ip.h"
#endif
  
#ifndef _MBUF_H
#include "mbuf.h"
#endif
  
#ifndef _IFACE_H
#include "iface.h"
#endif
  
#ifndef _SOCKADDR_H
#include "sockaddr.h"
#endif
  
/* AX.25 datagram (address) sub-layer definitions */
  
#define MAXDIGIS    7   /* Maximum number of digipeaters */
#define ALEN        6   /* Number of chars in callsign field */
#define AXALEN      7   /* Total AX.25 address length, including SSID */
#define AXBUF       10  /* Buffer size for maximum-length ascii call */
  
#ifndef _LAPB_H
#include "lapb.h"
#endif
  
/* Bits within SSID field of AX.25 address */
#define SSID        0x1e    /* Sub station ID */
#define REPEATED    0x80    /* Has-been-repeated bit in repeater field */
#define E       0x01    /* Address extension bit */
#define C       0x80    /* Command/response designation */
  
/* Our AX.25 address */
extern char Mycall[AXALEN];
extern char Bbscall[AXALEN];
  
/* List of AX.25 multicast addresses, e.g., "QST   -0" in shifted ASCII */
extern char Ax25multi[][AXALEN];
#define QSTCALL 0
#define NODESCALL 1
#define MAILCALL 2
#define IDCALL 3
/*currently not used in this code*/
#define OPENCALL 4
#define CQCALL 5
#define BEACONCALL 6
#define RMNCCALL 7
#define ALLCALL 8
  
extern int Digipeat;
extern int Ax25mbox;
  
/* Number of chars in interface field. The involved definition takes possible
 * alignment requirements into account, since ax25_addr is of an odd size.
 */
#define ILEN    (sizeof(struct sockaddr) - sizeof(short) - AXALEN)
  
/* Socket address, AX.25 style */
struct sockaddr_ax {
    short sax_family;       /* 2 bytes */
    char ax25_addr[AXALEN];
    char iface[ILEN];       /* Interface name */
};
  
/* Internal representation of an AX.25 header */
struct ax25 {
    char dest[AXALEN];      /* Destination address */
    char source[AXALEN];        /* Source address */
    char digis[MAXDIGIS][AXALEN];   /* Digi string */
    int ndigis;         /* Number of digipeaters */
    int nextdigi;           /* Index to next digi in chain */
    int cmdrsp;         /* Command/response */
};
  
/* C-bit stuff */
#define LAPB_UNKNOWN        0
#define LAPB_COMMAND        1
#define LAPB_RESPONSE       2
  
/* AX.25 routing table entry */
struct ax_route {
    struct ax_route *next;      /* Linked list pointer */
    char target[AXALEN];
    struct iface *iface;
    char digis[MAXDIGIS][AXALEN];
    int ndigis;
    char type;
#define AX_LOCAL    1       /* Set by local ax25 route command */
#define AX_AUTO     2       /* Set by incoming packet */
#define AX_PERM     3       /* Make this a permanent entry - K5JB */
    char mode;          /* Connection mode (G1EMM) */
#define AX_DEFMODE  0       /* Use default interface mode */
#define AX_VC_MODE  1       /* Try to use Virtual circuit */
#define AX_DATMODE  2       /* Try to use Datagrams only */
};
#define NULLAXR ((struct ax_route *)0)
  
extern struct ax_route *Ax_routes;
extern struct ax_route Ax_default;
  
/* AX.25 Level 3 Protocol IDs (PIDs) */
#define PID_X25     0x01    /* CCITT X.25 PLP */
#define PID_SEGMENT 0x08    /* Segmentation fragment */
#define PID_TEXNET  0xc3    /* TEXNET datagram protocol */
#define PID_LQ      0xc4    /* Link quality protocol */
#define PID_APPLETALK   0xca    /* Appletalk */
#define PID_APPLEARP    0xcb    /* Appletalk ARP */
#define PID_IP      0xcc    /* ARPA Internet Protocol */
#define PID_ARP     0xcd    /* ARPA Address Resolution Protocol */
#define PID_RARP    0xce    /* ARPA Reverse Address Resolution Protocol */
#define PID_NETROM  0xcf    /* NET/ROM */
#define PID_NO_L3   0xf0    /* No level 3 protocol */
  
#define SEG_FIRST   0x80    /* First segment of a sequence */
#define SEG_REM     0x7f    /* Mask for # segments remaining */
  
#define AX_EOL      "\r"    /* AX.25 end-of-line convention */
  
/* Link quality report packet header, internal format */
struct lqhdr {
    int16 version;      /* Version number of protocol */
#define LINKVERS    1
    int32   ip_addr;    /* Sending station's IP address */
};
#define LQHDR   6
/* Link quality entry, internal format */
struct lqentry {
    char addr[AXALEN];  /* Address of heard station */
    int32 count;        /* Count of packets heard from that station */
};
#define LQENTRY 11
  
/* Link quality database record format
 * Currently used only by AX.25 interfaces
 */
struct lq {
    struct lq *next;
    char addr[AXALEN];  /* Hardware address of station heard */
    struct iface *iface;    /* Interface address was heard on */
    int32 time;     /* Time station was last heard */
    int32 currxcnt; /* Current # of packets heard from this station */
  
#ifdef  notdef      /* Not yet implemented */
    /* # of packets heard from this station as of his last update */
    int32 lastrxcnt;
  
    /* # packets reported as transmitted by station as of his last update */
    int32 lasttxcnt;
  
    int16 hisqual;  /* Fraction (0-1000) of station's packets heard
             * as of last update
             */
    int16 myqual;   /* Fraction (0-1000) of our packets heard by station
             * as of last update
             */
#endif
};
#define NULLLQ  (struct lq *)0
  
extern struct lq *Lq;   /* Link quality record headers */
  
/* Structure used to keep track of monitored destination addresses */
struct ld {
    struct ld *next;    /* Linked list pointers */
    char addr[AXALEN];/* Hardware address of destination overheard */
    struct iface *iface;    /* Interface address was heard on */
    int32 time;     /* Time station was last mentioned */
    int32 currxcnt; /* Current # of packets destined to this station */
};
#define NULLLD  (struct ld *)0
  
extern struct ld *Ld;   /* Destination address record headers */
  
#ifdef __GNUC__
struct ax25_cb;           /* forward declaration */
#endif
  
/* Linkage to network protocols atop ax25 */
struct axlink {
    int pid;
    void (*funct) __ARGS((struct iface *,struct ax25_cb *,char *, char *,
    struct mbuf *,int));
};
extern struct axlink Axlink[];
  
/* Codes for the open_ax25 call */
#define AX_PASSIVE  0
#define AX_ACTIVE   1
#define AX_SERVER   2   /* Passive, clone on opening */
  
/* Max number of fake AX.25 interfaces for RFC-1226 encapsulation */
#ifndef NAX25
#define NAX25       16
#endif
  
#define AXHEARD_PASS    0   /* Log both src and dest callsigns */
#define AXHEARD_NOSRC   1   /* do not log source callsign */
#define AXHEARD_NODST   2   /* do not log destination callsign */
#define AXHEARD_NONE    3   /* do not log any callsign */
  
/* an call that should not be jump-started */
struct no_js {
    struct no_js *next;
    char call[AXALEN];
};
  
/* AX.25 protocol data kept per interface */
struct ifax25 {
    int paclen;
    int lapbtimertype;
    long irtt;
    int version;
    long t2;
    long t3;
    long t4;
    int n2;
    int maxframe;
    int pthresh;
    int window;
    long blimit;
    long maxwait;   /* maximum backoff time */
    char *bctext;
    char cdigi[AXALEN];
#ifdef MAILBOX
    char bbscall[AXALEN];
#endif
};
  
/* In ax25.c: */
struct ax_route *ax_add __ARGS((char *,int,char digis[][AXALEN],int,struct iface *));
int ax_drop __ARGS((char *,struct iface *,int));
struct ax_route *ax_lookup __ARGS((char *,struct iface *));
void axip_input __ARGS((struct iface *iface,struct ip *ip,struct mbuf *bp,int rxbroadcast));
void ax_recv __ARGS((struct iface *,struct mbuf *));
int ax_send __ARGS((struct mbuf *bp,struct iface *iface,int32 gateway,int prec,
    int del,int tput,int rel));
int ax_output __ARGS((struct iface *iface,char *dest,char *source,int16 pid,
    struct mbuf *data));
int sendframe __ARGS((struct ax25_cb *axp,int cmdrsp,int ctl,struct mbuf *data));
void axnl3 __ARGS((struct iface *iface,struct ax25_cb *axp,char *src,
    char *dest,struct mbuf *bp,int mcast));
void paxipdest __ARGS((struct iface *iface));

/* In ax25cmd.c: */
void st_ax25 __ARGS((struct ax25_cb *axp));
int axheard __ARGS((struct iface *ifp));
void init_ifax25 __ARGS((struct ifax25 *));
int connect_filt __ARGS((int argc,char *argv[],char target[],struct iface *ifp));
  
/* In axhdr.c: */
struct mbuf *htonax25 __ARGS((struct ax25 *hdr,struct mbuf *data));
int ntohax25 __ARGS((struct ax25 *hdr,struct mbuf **bpp));
  
/* In axlink.c: */
void getlqentry __ARGS((struct lqentry *ep,struct mbuf **bpp));
void getlqhdr __ARGS((struct lqhdr *hp,struct mbuf **bpp));
void logsrc __ARGS((struct iface *iface,char *addr));
void logdest __ARGS((struct iface *iface,char *addr));
char *putlqentry __ARGS((char *cp,char *addr,int32 count));
char *putlqhdr __ARGS((char *cp,int16 version,int32 ip_addr));
struct lq *al_lookup __ARGS((struct iface *ifp,char *addr,int sort));
  
/* In ax25user.c: */
int ax25val __ARGS((struct ax25_cb *axp));
int disc_ax25 __ARGS((struct ax25_cb *axp));
int kick_ax25 __ARGS((struct ax25_cb *axp));
struct ax25_cb *open_ax25 __ARGS((struct iface *,char *,char *,
int,int16,
void (*) __ARGS((struct ax25_cb *,int)),
void (*) __ARGS((struct ax25_cb *,int)),
void (*) __ARGS((struct ax25_cb *,int,int)),
int user));
struct mbuf *recv_ax25 __ARGS((struct ax25_cb *axp,int16 cnt));
int reset_ax25 __ARGS((struct ax25_cb *axp));
int send_ax25 __ARGS((struct ax25_cb *axp,struct mbuf *bp,int pid));
  
/* In ax25subr.c: */
int addreq __ARGS((char *a,char *b));
struct ax25_cb *cr_ax25 __ARGS((char *local,char *remote,struct iface *iface));
void del_ax25 __ARGS((struct ax25_cb *axp));
struct ax25_cb *find_ax25 __ARGS((char *local,char *remote,struct iface *iface));
char *pax25 __ARGS((char *e,char *addr));
int setcall __ARGS((char *out,char *call));
  
/* In axui.c: */
int doaxui __ARGS((int argc, char *argv[],void *p));
void axui_input __ARGS((struct iface *iface,struct ax25_cb *axp,char *src,char *dest,struct mbuf *bp,int mcast));

/* In socket.c: */
void beac_input __ARGS((struct iface *iface,char *src,struct mbuf *bp));
void s_arcall __ARGS((struct ax25_cb *axp,int cnt));
void s_ascall __ARGS((struct ax25_cb *axp,int old,int new));
void s_atcall __ARGS((struct ax25_cb *axp,int cnt));
  
#endif  /* _AX25_H */