* Copyright (c) 1985 The Regents of the University of California.
* This file includes significant work done at Cornell University by
* Bill Nesheim. That work included by permission.
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
static char sccsid
[] = "@(#)output.c 5.6 (Berkeley) %G%";
* Routing Table Management Daemon
* Apply the function "f" to all non-passive
* interfaces. If the interface supports the
* use of broadcasting use it, otherwise address
* the output to the known router.
register struct interface
*ifp
;
register struct sockaddr
*dst
;
extern struct interface
*ifnet
;
for (ifp
= ifnet
; ifp
; ifp
= ifp
->int_next
) {
if (ifp
->int_flags
& IFF_PASSIVE
)
dst
= ifp
->int_flags
& IFF_BROADCAST
? &ifp
->int_broadaddr
:
ifp
->int_flags
& IFF_POINTOPOINT
? &ifp
->int_dstaddr
:
flags
= ifp
->int_flags
& IFF_INTERFACE
? MSG_DONTROUTE
: 0;
* Output a preformed packet.
(*afswitch
[dst
->sa_family
].af_output
)
(flags
, dst
, sizeof (struct rip
));
TRACE_OUTPUT(ifp
, dst
, sizeof (struct rip
));
* Supply dst with the contents of the routing tables.
* If this won't fit in one packet, chop it up into several.
register struct rt_entry
*rt
;
register struct rthash
*rh
;
register struct netinfo
*nn
;
register struct netinfo
*n
= msg
->rip_nets
;
struct rthash
*base
= hosthash
;
struct sockaddr_ns
*sns
= (struct sockaddr_ns
*) dst
;
int (*output
)() = afswitch
[dst
->sa_family
].af_output
;
int doinghost
= 1, size
, metric
;
msg
->rip_cmd
= ntohs(RIPCMD_RESPONSE
);
for (rh
= base
; rh
< &base
[ROUTEHASHSIZ
]; rh
++)
for (rt
= rh
->rt_forw
; rt
!= (struct rt_entry
*)rh
; rt
= rt
->rt_forw
) {
size
= (char *)n
- (char *)msg
;
if (size
> MAXPACKETSIZE
- sizeof (struct netinfo
)) {
(*output
)(flags
, dst
, size
);
TRACE_OUTPUT(ifp
, dst
, size
);
sns
= (struct sockaddr_ns
*)&rt
->rt_dst
;
if ((rt
->rt_flags
& (RTF_HOST
|RTF_GATEWAY
)) == RTF_HOST
)
sns
= (struct sockaddr_ns
*)&rt
->rt_router
;
metric
= min(rt
->rt_metric
+ 1, HOPCNT_INFINITY
);
net
= sns
->sns_addr
.x_net
;
* Make sure that we don't put out a two net entries
* for a pt to pt link (one for the G route, one for the if)
* This is a kludge, and won't work if there are lots of nets.
for (nn
= msg
->rip_nets
; nn
< n
; nn
++) {
if (ns_neteqnn(net
, nn
->rip_dst
)) {
if (metric
< ntohs(nn
->rip_metric
))
nn
->rip_metric
= htons(metric
);
n
->rip_metric
= htons(metric
);
if (n
!= msg
->rip_nets
) {
size
= (char *)n
- (char *)msg
;
(*output
)(flags
, dst
, size
);
TRACE_OUTPUT(ifp
, dst
, size
);