Date: Wed, 18 Apr 2007 10:11:23 +0300 From: "Ivo Vachkov" <ivo.vachkov@gmail.com> To: "Alan Garfield" <alan@fromorbit.com> Cc: freebsd-net@freebsd.org Subject: Re: rtentry and rtrequest Message-ID: <f85d6aa70704180011x46052036h281c56850e01b944@mail.gmail.com> In-Reply-To: <1176861009.4426.21.camel@hiro.auspc.com.au> References: <1176861009.4426.21.camel@hiro.auspc.com.au>
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please, give us more info about the connection between ARP (address
resolution protocol) and rtentry/rtrequest.
about the debug information:
man 9 printf
man 9 log
On 4/18/07, Alan Garfield <alan@fromorbit.com> wrote:
> Hi all!
>
> One word.... HOW! :)
>
> I've no clue what this FreeBSD ARP stuff is all about, there is little
> or no documentation, there are 14 different sock_addr's which seem to
> have a bazillion different fields, and I cannot output a simple debug
> statement without getting 'error: dereferencing pointer to incomplete
> type' errors!
>
> Sorry for the rant, I'm just frustrated. :) I've been going great on
> this port, but now I've struck ARP and have been stuck for days and I
> cannot seem to get myself out no matter how much kernel code I grep it
> still all looks Greek to me.
>
> I understand what ARP is and how it does it's thing. I even understand
> how Linux does it, but I cannot get a handle on how/why FreeBSD does
> what it does.
>
> Can someone point me in the direction or give an example to output debug
> from an rtrequest method. Currently I've got :-
>
> ----
> static void
> jnet_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo
> *info)
> {
> struct ifnet *ifp = rt->rt_ifp;
> struct jnet_softc *sc =
> ifp->if_softc;
>
> RT_LOCK_ASSERT(rt);
>
> switch (cmd)
> {
>
> case
> RTM_ADD:
> device_printf(sc->dev, "RTM_ADD. \n");
>
> if (SIN(rt_key(rt))->sin_family == AF_INET)
> {
> device_printf(sc->dev, "AF_INET
> \n");
> }
>
>
> break;
>
> case RTM_RESOLVE:
> device_printf(sc->dev, "RTM_RESOLVE.
> \n");
>
> break;
>
> case RTM_DELETE:
> device_printf(sc->dev, "RTM_DELETE.
> \n");
> break;
> }
>
> rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
> }
> ----
>
> I just want an idea of the structures involved, and what I need to
> implement to intercept and injecting a fake MAC so my buffer driver can
> communicate with the other side without ARP errors.
>
> Any help would be more than appreciated (eg. I'd I'll buy you a case of
> beer next time you're in Sydney Australia).
>
> Thanks,
> Alan.
>
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--
"UNIX is basically a simple operating system, but you have to be a
genius to understand the simplicity." Dennis Ritchie
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