I have once tried to implement IP over firewire with earlier ID. spec. in the previous version of driver. The packetization, ARP and broadcast is not difficult to implement.
However, I cannot believe the MCAP mechanism will not work properly,
since limited No. of acceptable stream channels is supported on
current firewire chipset. I think the current IP over Firewire spec. does
not include mechanism to suppress channel allocation in the case of
receiver cannot open more stream channels.
On 2004/02/02, at 14:50, Hidetoshi Shimokawa wrote:
At Sat, 31 Jan 2004 15:27:03 +0100, Dario Freni wrote:
[1 <text/plain (quoted-printable)>]
Hi guys,
I was wondering if the standard implementation of IPoFW is planning to
be implemented. I'm not expert on device writing, I was also looking for
some workarounds, like attach the fwe0:lower netgraph hook to a virtual
interface, but reading the rfc I realized that the normal IP packet
needs an encapsulation before it's sent on the wire.
I have no plan to implement rfc2734 by myself near future. IEEE1394 is somewhat complicated, compared with Ethernet. Because there are some types of packets, fwe and IPoFW uses very different packet type and formats, so you don't have an easy workaround using netgraph.
If you are interested in implementing rfc2734, you need several steps.
- Implement rfc2734 encapsulation as /sys/net/if_ethersubr.c for ethernt. rfc2734 uses very different packet format from ethernet.
- Implement generic GASP receive routin in the firewire driver. You need this service for multicast/broadcast packet such as an arp packet.
- Implement if_fw.c for the interface device.
Though I'm not sure it actually worked, the firewire driver for FreeBSD-4.0 seems to have a support for IPoFW See ftp://ftp.uec.ac.jp/pub/firewire/ for the patch.
Bye, Dario
--
Dario Freni ([EMAIL PROTECTED]) - SaturNero on IRCNet, Azzurra
Gruppo Utenti FreeBSD Italia (http://www.gufi.org)
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