Frode,
I agree. I just changed both user and kernel to
support 512 bridges (I build bridges between vlans)
and it works great but it would be nice to have that
number set as a variable.
Ron.
> From: Frode Nordahl <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Organization:
> Date: 17 Dec 2002 10:24:22 +0100
> Subject: [Bridge] Many bridge interfaces on one
> computer
>
>
> --=-eP+ySS48xuwNws7Ufi0U
> Content-Type: text/plain
> Content-Transfer-Encoding: quoted-printable
>
> Hello,
>
> Running kernel 2.4.20 and bridge-utils 0.9.6
>
> If you set up X bridge interfaces where X > 32, the
> brctl userland
> program will not be able to inspect or configure the
> first interface(s)
> set up anymore.
>
> However the bridge code continues to bridge.
>
> If we apply a simple patch to the kernel and brctl
> program (simply
> increasing the size of an array) it works fine.
>
> It seems like there is some limitation in the IOCTL
> interface as for how
> many interfaces will be listed when you ask the
> kernel.
>
> Looking at net/bridge/br_ioctl.c in
> br_ioctl_deviceless()
>
> case BRCTL_GET_BRIDGES:
> {
> int i;
> int indices[64];
>
> for (i=3D0;i<64;i++)
> indices[i] =3D 0;
>
> if (arg1 > 64)
> arg1 =3D 64;
> arg1 =3D
> br_get_bridge_ifindices(indices, arg1);
> if (copy_to_user((void *)arg0,
> indices,
> arg1*sizeof(int)))
> return -EFAULT;
>
> return arg1;
> }
>
> There is a hardcoded limit of 64 interfaces, in the
> brctl program there
> is a hardcoded limit of 32 interfaces.
>
> However there seems to be no real limit anywhere
> near those numbers, so
> I wonder why it's there.
>
> If it should be there, the limit should at least be
> set in a public
> header so the userland and kernel agree on it. And
> the brctl software
> should not add more interfaces than it can list /
> manage.
>
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