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- /* Functions for level 3 net/rom support */
- #include "global.h"
- #include "mbuf.h"
- #include "ax25.h"
- #include "netrom.h"
- #include "lapb.h"
- #include <ctype.h>
-
- /* Convert a net/rom network header to host format structure
- * Return -1 if error, 0 if OK
- */
-
- int
- ntohnr3(hdr,bpp)
- register struct nr3hdr *hdr ; /* output structure */
- struct mbuf **bpp ;
- {
- char ttl ;
-
- if (pullup(bpp,hdr->source,AXALEN) < AXALEN)
- return -1 ;
-
- if (pullup(bpp,hdr->dest,AXALEN) < AXALEN)
- return -1 ;
-
- if (pullup(bpp,&ttl,1) != 1)
- return -1 ;
-
- hdr->ttl = uchar(ttl) ;
-
- return 0 ;
- }
-
- /* Convert a host-format net/rom level 3 header into an mbuf ready
- * for transmission.
- */
-
- struct mbuf *
- htonnr3(hdr)
- register struct nr3hdr *hdr;
- {
- struct mbuf *rbuf ;
- register char *cp ;
-
- if (hdr == (struct nr3hdr *) NULL)
- return NULLBUF ;
-
- /* Allocate space for return buffer */
- if ((rbuf = alloc_mbuf(NR3HLEN)) == NULLBUF)
- return NULLBUF ;
-
- rbuf->cnt = NR3HLEN ;
-
- /* Now convert */
- cp = rbuf->data ;
-
- memcpy(cp,hdr->source,AXALEN);
- cp[ALEN] &= ~E ; /* source E-bit is always off */
- cp += AXALEN;
- memcpy(cp,hdr->dest,AXALEN);
- cp[ALEN] |= E ; /* destination E-bit always set */
- cp += AXALEN;
- *cp = hdr->ttl ;
-
- return rbuf ;
- }
-
- /* Convert a net/rom routing broadcast destination subpacket from
- * network format to a host format structure. Return -1 if error,
- * 0 if OK.
- */
- int
- ntohnrdest(ds,bpp)
- register struct nr3dest *ds ;
- struct mbuf **bpp ;
- {
- char quality ;
-
- /* get destination callsign */
- if (pullup(bpp,ds->dest,AXALEN) < AXALEN)
- return -1 ;
-
- /* get destination alias */
- if (pullup(bpp,ds->alias,ALEN) < ALEN)
- return -1 ;
- ds->alias[ALEN] = '\0' ;
-
- /* get best neighbor callsign */
- if (pullup(bpp,ds->neighbor,AXALEN) < AXALEN)
- return -1 ;
-
- /* get route quality */
- if (pullup(bpp,&quality,1) < 1)
- return -1 ;
- ds->quality = uchar(quality) ;
-
- return 0 ;
- }
-
- /* Convert a host-format net/rom destination subpacket into an
- * mbuf ready for transmission as part of a route broadcast
- * packet.
- */
- struct mbuf *
- htonnrdest(ds)
- register struct nr3dest *ds ;
- {
- struct mbuf *rbuf ;
- register char *cp ;
-
- if (ds == (struct nr3dest *) NULL)
- return NULLBUF ;
-
- /* Allocate space for return buffer */
- if ((rbuf = alloc_mbuf(NRRTDESTLEN)) == NULLBUF)
- return NULLBUF ;
-
- rbuf->cnt = NRRTDESTLEN ;
-
- cp = rbuf->data ;
-
- memcpy(cp,ds->dest,AXALEN) ;
- cp += AXALEN;
-
- memcpy(cp,ds->alias,ALEN) ;
- cp += ALEN ;
-
- memcpy(cp,ds->neighbor,AXALEN) ;
- cp += AXALEN;
-
- *cp = uchar(ds->quality) ;
-
- return rbuf ;
- }
-
-