Date: Sun, 28 Jun 1998 01:33:22 -0300 (EST) From: Joao Carlos Mendes Luis <jonny@jonny.eng.br> To: net@FreeBSD.ORG Subject: mrouting and ioctl(SIOCGETVIFCNT) Message-ID: <199806280433.BAA22277@roma.coe.ufrj.br>
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Hi,
I'm trying to use ioctl SIOCGETVIFCNT to get traffic statistics
on multicast vifs. But my results are very strange:
vif0, inp=12573, inb=503855516, outp=35900, outb=1835387904
vif1, inp=35900, inb=1835387904, outp=11262, outb=462654994
vif2, inp=0, inb=0, outp=1039, outb=34649536
vif3, inp=0, inb=0, outp=0, outb=0
On vif2, for example, suppose it has really sent 34649536 bytes,
using 1039 packets. The average packet size would be 33348 !
No, this is not real... Is there a known bug in kernel ?
It seems to be some kind of host/network format conversion.
The program couldn't be simpler (stripping includes):
void
main( void )
{
int vif;
int s;
struct sioc_vif_req vr;
if ( ( s = socket( AF_INET, SOCK_DGRAM, 0 ) ) < 0 )
err( 1, "Cannot open control socket" );
vif = 0;
while ( 1 ) {
vr.vifi = vif;
if ( ioctl( s, SIOCGETVIFCNT, &vr ) < 0 ) {
if ( errno == EINVAL ) break;
err( 2, "socket(SIOCGETVIFCNT)" );
}
printf( "vif%d, inp=%lu, inb=%lu, outp=%lu, outb=%lu\n",
vif, vr.icount, vr.ibytes, vr.ocount, vr.obytes );
++vif;
}
close( s );
}
Jonny
--
Joao Carlos Mendes Luis M.Sc. Student
jonny@jonny.eng.br Universidade Federal do Rio de Janeiro
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