etc/atalkd/rtmp.h

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/*
 * Copyright (c) 1990,1993 Regents of The University of Michigan.
 * All Rights Reserved. See COPYRIGHT.
 *
 * We have an rtmptab circular linked list for each gateway.  Entries
 * are inserted in the order we get them.  The expectation is that
 * we will get a complexity of N for the stable case.  If we have N
 * existing entries, and M new entries, we'll have on the order of
 * N + ( M * N ) complexity (really it will be something more than
 * that, maybe N + ( M * ( N + 1/2 M )).  Note that having a list to
 * search is superior to a hash table if you are expecting bad data:
 * you have the opportunity to range-check the incoming data.
 *
 * We keep several ZIP related flags and counters here.  For ZIP Extended
 * Replies, we must keep a flag indicating that the zone is up or down.
 * This flag is necessary for ZIP Extended Replies which cross packet
 * boundaries: even tho the rtmptab entry has data, it is not yet
 * complete.  For ZIP in general, we keep a flag indicating that we've
 * asked for a ZIP (E)Reply.  If this flag is not set, we won't process
 * ZIP Reply data for given rtmptab entries.  Lastly, we keep a count of
 * the number of times we've asked for ZIP Reply data.  When this value
 * reaches some value (3?), we can optionally stop asking.
 */
 
#ifndef ATALKD_RTMP_H
#define ATALKD_RTMP_H 1
 
#include <sys/types.h>
 
struct rtmptab {
    struct rtmptab   *rt_next, *rt_prev;
    struct rtmptab   *rt_inext, *rt_iprev;
    unsigned short      rt_firstnet, rt_lastnet;
    unsigned char       rt_hops;
    unsigned char       rt_state;
    unsigned char       rt_flags;
    unsigned char       rt_nzq;       /* number of zip queries issued */
    struct gate     *rt_gate;    /* gate is NULL for interfaces */
    struct list     *rt_zt;
    const struct interface    *rt_iface;
};
 
struct rtmp_head {
    unsigned short  rh_net;
    unsigned char   rh_nodelen;
    unsigned char   rh_node;
};
 
struct rtmp_tuple {
    unsigned short  rt_net;
    unsigned char   rt_dist;
};
#define SZ_RTMPTUPLE    3
 
#define RTMPTAB_PERM    0
#define RTMPTAB_GOOD    1
#define RTMPTAB_SUSP1   2
#define RTMPTAB_SUSP2   3
#define RTMPTAB_BAD 4
 
#define RTMPTAB_ZIPQUERY    0x01
#define RTMPTAB_HASZONES    0x02
#define RTMPTAB_EXTENDED    0x04
#define RTMPTAB_ROUTE       0x08
 
#ifndef BSD4_4
#define RTMP_ADD    SIOCADDRT
#define RTMP_DEL    SIOCDELRT
#else /* BSD4_4 */
#define RTMP_ADD    RTM_ADD
#define RTMP_DEL    RTM_DELETE
#endif /* BSD4_4 */
 
#define STARTUP_FIRSTNET    0xff00
#define STARTUP_LASTNET     0xfffe
 
/* On NetBSD, Net 0 is reserved for lo0, it can't be used on other interfaces. */
#ifndef __NetBSD__
#define OS_STARTUP_FIRSTNET     0
#else
#define OS_STARTUP_FIRSTNET     1
#endif
 
extern int  rtfd;
struct rtmptab   *newrt(const struct interface *);
void rtmp_delzonemap(struct rtmptab *);
 
int rtmp_request(struct interface *);
void rtmp_free(struct rtmptab *);
int rtmp_replace(struct rtmptab **);
int looproute(struct interface *, unsigned int);
int gateroute(unsigned int, struct rtmptab *);
 
struct atport;
 
int rtmp_packet(struct atport *ap, struct sockaddr_at *from, char *data,
                int len);
 
#endif /* atalkd/rtmp.h */