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Internet Info 1994 March
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Internet Info CD-ROM (Walnut Creek) (March 1994).iso
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networking
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ip
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ka9q
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src.arc
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NETROM.H
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C/C++ Source or Header
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1989-08-19
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7KB
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203 lines
#ifndef NR3HLEN
#include "iface.h"
#include "ax25.h"
/* net/rom support definitions
* Copyright 1989 by Daniel M. Frank, W9NK. Permission granted for
* non-commercial distribution only.
*/
#define NR3HLEN 15 /* length of a net/rom level 3 hdr, */
#define NR3DLEN 241 /* max data size in net/rom l3 packet */
#define NR3NODESIG 0xff /* signature for nodes broadcast */
#define NR3NODEHL 7 /* nodes bc header length */
#define NRNUMIFACE 10 /* number of interfaces associated */
/* with net/rom network layer */
#define NRNUMCHAINS 17 /* number of chains in the */
/* neighbor and route hash tables */
#define NRRTDESTLEN 21 /* length of destination entry in */
/* nodes broadcast */
#define NRDESTPERPACK 11 /* maximum number of destinations per */
/* nodes packet */
/* NET/ROM protocol numbers */
#define NRPROTO_IP 0x0c
/* Internal representation of net/rom network layer header */
struct nr3hdr {
struct ax25_addr source ; /* callsign of origin node */
struct ax25_addr dest ; /* callsign of destination node */
unsigned ttl ; /* time-to-live */
} ;
/* Internal representation of net/rom routing broadcast destination */
/* entry */
struct nr3dest {
struct ax25_addr dest ; /* destination callsign */
char alias[7] ; /* ident, upper case ASCII, blank-filled */
struct ax25_addr neighbor ; /* best-quality neighbor */
unsigned quality ; /* quality of route for this neighbor */
} ;
/* net/rom interface table entry */
struct nriface {
struct iface *iface ; /* pointer to ax.25 interface */
char alias[7] ; /* alias for this interface's node */
/* broadcasts */
unsigned quality ; /* net/rom link quality estimate */
} ;
/* net/rom neighbor table structure */
struct nrnbr_tab {
struct nrnbr_tab *next ; /* doubly linked list pointers */
struct nrnbr_tab *prev ;
char call[AXALEN*3] ; /* call of neighbor + 2 digis max */
unsigned iface ; /* offset of neighbor's port in */
/* interface table */
unsigned refcnt ; /* how many routes for this neighbor? */
} ;
#define NULLNTAB (struct nrnbr_tab *)0
/* A list of these structures is provided for each route table */
/* entry. They bind a destination to a neighbor node. If the */
/* list of bindings becomes empty, the route table entry is */
/* automatically deleted. */
struct nr_bind {
struct nr_bind *next ; /* doubly linked list */
struct nr_bind *prev ;
unsigned quality ; /* quality estimate */
unsigned obsocnt ; /* obsolescence count */
unsigned flags ;
#define NRB_PERMANENT 0x01 /* entry never times out */
#define NRB_RECORDED 0x02 /* a "record route" entry */
struct nrnbr_tab *via ; /* route goes via this neighbor */
} ;
#define NULLNRBIND (struct nr_bind *)0
/* net/rom routing table entry */
struct nrroute_tab {
struct nrroute_tab *next ; /* doubly linked list pointers */
struct nrroute_tab *prev ;
char alias[7] ; /* alias of node */
struct ax25_addr call ; /* callsign of node */
unsigned num_routes ; /* how many routes in bindings list? */
struct nr_bind *routes ; /* list of neighbors */
} ;
#define NULLNRRTAB (struct nrroute_tab *)0
/* The net/rom nodes broadcast filter structure */
struct nrnf_tab {
struct nrnf_tab *next ; /* doubly linked list */
struct nrnf_tab *prev ;
struct ax25_addr neighbor ; /* call of neighbor to filter */
unsigned iface ; /* filter on this interface */
} ;
#define NULLNRNFTAB (struct nrnf_tab *)0
/* Structure for handling raw NET/ROM user sockets */
struct raw_nr {
struct raw_nr *prev;
struct raw_nr *next;
struct mbuf *rcvq; /* receive queue */
char protocol; /* Protocol */
};
#define NULLRNR ((struct raw_nr *)0)
/* The interface table */
extern struct nriface Nrifaces[NRNUMIFACE] ;
/* How many interfaces are in use */
extern unsigned Nr_numiface ;
/* The neighbor hash table (hashed on neighbor callsign) */
extern struct nrnbr_tab *Nrnbr_tab[NRNUMCHAINS] ;
/* The routes hash table (hashed on destination callsign) */
extern struct nrroute_tab *Nrroute_tab[NRNUMCHAINS] ;
/* The nodes broadcast filter table */
extern struct nrnf_tab *Nrnf_tab[NRNUMCHAINS] ;
extern struct ax25_addr Nr_nodebc;
/* filter modes: */
#define NRNF_NOFILTER 0 /* don't filter */
#define NRNF_ACCEPT 1 /* accept broadcasts from stations in list */
#define NRNF_REJECT 2 /* reject broadcasts from stations in list */
/* The filter mode */
extern unsigned Nr_nfmode ;
/* The time-to-live for net/rom network layer packets */
extern unsigned short Nr_ttl ;
/* The obsolescence count initializer */
extern unsigned Obso_init ;
/* The threshhold at which routes becoming obsolete are not broadcast */
extern unsigned Obso_minbc ;
/* The quality threshhold below which routes in a broadcast will */
/* be ignored */
extern unsigned Nr_autofloor ;
/* Whether we want to broadcast the contents of our routing
* table, or just our own callsign and alias:
*/
extern int Nr_verbose ;
/* The maximum number of routes maintained for a destination. */
/* If the list fills up, only the highest quality routes are */
/* kept. This limiting is done to avoid possible over-use of */
/* memory for routing tables in closely spaced net/rom networks. */
extern unsigned Nr_maxroutes ;
/* The netrom pseudo-interface */
extern struct iface *Nr_iface ;
/* Functions */
/* In nr3.c: */
void del_rnr __ARGS((struct raw_nr *rpp));
struct ax25_addr *find_nralias __ARGS((char *));
struct nrroute_tab *find_nrroute __ARGS((struct ax25_addr *));
void nr_bcnodes __ARGS((unsigned ifno));
void nr_nodercv __ARGS((struct iface *iface,struct ax25_addr *source,struct mbuf *bp));
int nr_nfadd __ARGS((struct ax25_addr *, unsigned));
int nr_nfdrop __ARGS((struct ax25_addr *, unsigned));
void nr_route __ARGS((struct mbuf *bp,struct ax25_cb *iaxp));
int nr_routeadd __ARGS((char *, struct ax25_addr *, unsigned,
unsigned, char *, unsigned, unsigned));
int nr_routedrop __ARGS((struct ax25_addr *, struct ax25_addr *, unsigned));
void nr_sendraw __ARGS((struct ax25_addr *dest,unsigned family,unsigned proto,
struct mbuf *data));
void nr3output __ARGS((struct ax25_addr *dest,struct mbuf *data));
int16 nrhash __ARGS((struct ax25_addr *s));
struct raw_nr *raw_nr __ARGS((char));
/* In nrcmd.c: */
void donrdump __ARGS((struct nr4cb *cb));
/* In nrsubr.c: */
struct mbuf *htonnr3 __ARGS((struct nr3hdr *));
struct mbuf *htonnrdest __ARGS((struct nr3dest *));
int ntohnr3 __ARGS((struct nr3hdr *, struct mbuf **));
int ntohnrdest __ARGS((struct nr3dest *ds,struct mbuf **bpp));
#endif /* NR3HLEN */