Date: Wed, 16 Nov 2005 21:41:19 +0200 From: Ruslan Ermilov <ru@freebsd.org> To: Martin <marwos@sbcglobal.net> Cc: freebsd-net@freebsd.org Subject: Re: egress interface index lookup through a route SACK_RAW socket call Message-ID: <20051116194119.GA87976@ip.net.ua> In-Reply-To: <000201c5ead8$79dded30$3be48647@compaq> References: <000201c5ead8$79dded30$3be48647@compaq>
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On Wed, Nov 16, 2005 at 10:06:27AM -0800, Martin wrote:
> What / how do I construct a routing raw socket call to retrieve the
> outgoing interface index for a particular route that is destined out of
> an interface other than Ethernet such as a point to point?
> =20
> With Ethernet interfaces I was able to contruct a rt_msghdr with RTM_GET
> and RTA_DST- retrieve the gateway IP for the route then recursively call
> the same function passing the gateway IP and the sock_addr_in
> ->sin_addr.s_port would return with the interface index.
> =20
> But this does not work with PPP interfaces or other non-Ethernet. Any
> insight to what i am lacking in the route request would be appreciated.
> =20
Apply the below patch to the route(8) command, then issue this:
route -vn get -host x.x.x.x
The IFP sockaddr will always be sockaddr_dl (AF_LINK) which has an
interface index. For example,
: # ifconfig ng0 10.0.0.1 10.0.0.2
: # ./route -vn get -host 10.0.0.2
: u: inet 10.0.0.2; u: link ; RTM_GET: Report Metrics: len 164, pid: 0, seq=
1, errno 0, flags:<UP,GATEWAY,HOST,STATIC>
: locks: inits:=20
: sockaddrs: <DST,IFP>
: 10.0.0.2 :0
: route to: 10.0.0.2
: destination: 10.0.0.2
: interface: ng0
: flags: <UP,HOST,DONE>
: recvpipe sendpipe ssthresh rtt,msec rttvar hopcount mtu =
expire
: 0 0 0 0 0 0 1500 =
0=20
:=20
: locks: inits:=20
: sockaddrs: <DST,GATEWAY,IFP,IFA,BRD>
: 10.0.0.2 10.0.0.1 ng0:3 10.0.0.1 10.0.0.2
^^^^^
%%%
Index: route.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
RCS file: /home/ncvs/src/sbin/route/route.c,v
retrieving revision 1.81
diff -u -r1.81 route.c
--- route.c 28 Sep 2005 12:12:15 -0000 1.81
+++ route.c 16 Nov 2005 19:35:30 -0000
@@ -385,7 +385,12 @@
break;
=20
case AF_LINK:
- return (link_ntoa((struct sockaddr_dl *)sa));
+ {
+ static char buf[80];
+ struct sockaddr_dl *sdl =3D (struct sockaddr_dl *)sa;
+ sprintf(buf, "%s:%d", link_ntoa(sdl), sdl->sdl_index);
+ return (buf);
+ }
=20
default:
{ u_short *s =3D (u_short *)sa;
%%%
Cheers,
--=20
Ruslan Ermilov
ru@FreeBSD.org
FreeBSD committer
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