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Reviewed by: julian

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Submitted by:	archie@whistle.com

This patch allows true interface routing to be controlled
from the command line..
you can now do:
route add default -interface ppp0
even if you have no clue what the address at the other end is..

this is part of a set of changes that allow true "unnumbered links"
such as netcom run between their sites..
In practice you should assign the address from one of your ethernet
interfaces to the local side of the P2P link so that IP doesn't
say that the packet comes from 255.255.255.255, but
there is no need whatsoever to assign an address of any kind
to the remote end of the link.. useful for frame relay links etc also.
This commit is contained in:
Julian Elischer 1996-08-09 22:52:02 +00:00
parent 5a5711612a
commit 914b41c2dc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=17486
3 changed files with 46 additions and 2 deletions
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2
sbin/route/Makefile
View File

@ -3,7 +3,7 @@
PROG= route
MAN8= route.8
SRCS= route.c keywords.h # ccitt_addr.h
CFLAGS+=-I.
CFLAGS+=-I. -Wall
CLEANFILES+=keywords.h
BINOWN= root
BINMODE=4555

2
sbin/route/route.8
View File

@ -177,6 +177,8 @@ no intermediary system to act as a gateway, the
modifier should be specified;
the gateway given is the address of this host on the common network,
indicating the interface to be used for transmission.
If the interface point to point, the name of the interface
itself may be given instead.
.Pp
The optional modifiers
.Fl xns ,

44
sbin/route/route.c
View File

@ -43,7 +43,7 @@ static const char copyright[] =
static char sccsid[] = "@(#)route.c 8.3 (Berkeley) 3/19/94";
*/
static const char rcsid[] =
"$Id: route.c,v 1.10 1996/07/23 01:18:47 julian Exp $";
"$Id: route.c,v 1.11 1996/07/23 22:00:14 julian Exp $";
#endif /* not lint */
#include <sys/param.h>
@ -827,6 +827,48 @@ getaddr(which, s, hpp)
break;
case RTA_GATEWAY:
su = &so_gate;
if (iflag) {
#define MAX_IFACES 400
int sock;
struct ifreq iflist[MAX_IFACES];
struct ifconf ifconf;
struct ifreq *ifr, *ifr_end;
struct sockaddr_dl *dl, *sdl = NULL;
/* Get socket */
if ((sock = socket(PF_INET, SOCK_DGRAM, 0)) < 0)
err(1, "socket");
/* Get interface list */
ifconf.ifc_req = iflist;
ifconf.ifc_len = sizeof(iflist);
if (ioctl(sock, SIOCGIFCONF, &ifconf) < 0)
err(1, "ioctl(SIOCGIFCONF)");
close(sock);
/* Look for this interface in the list */
for (ifr = ifconf.ifc_req,
ifr_end = (struct ifreq *)
(ifconf.ifc_buf + ifconf.ifc_len);
ifr < ifr_end;
ifr = (struct ifreq *) ((char *) &ifr->ifr_addr
+ ifr->ifr_addr.sa_len)) {
dl = (struct sockaddr_dl *)&ifr->ifr_addr;
if (ifr->ifr_addr.sa_family == AF_LINK
&& (ifr->ifr_flags & IFF_POINTOPOINT)
&& !strncmp(s, dl->sdl_data, dl->sdl_nlen)
&& s[dl->sdl_nlen] == 0) {
sdl = dl;
break;
}
}
/* If we found it, then use it */
if (sdl) {
su->sdl = *sdl;
return(1);
}
}
su->sa.sa_family = af;
break;
case RTA_NETMASK: