Date: Tue, 14 Jan 2003 07:22:05 +0100 From: Vincent Jardin <vjardin@wanadoo.fr> To: "Radoslav Vasilev" <rado@cablebg.net>, <freebsd-net@freebsd.org> Cc: <freebsd-hackers@freebsd.org> Subject: Re: kld && inetsw.pr_protocol overriding + old reuse Message-ID: <3E075B46009F1F35@mel-rta9.wanadoo.fr> (added by postmaster@wanadoo.fr) In-Reply-To: <000b01c2bb5e$eb42f8f0$13e309d9@deckland> References: <000b01c2bb5e$eb42f8f0$13e309d9@deckland>
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It is not very simple. However Netgraph/ng_socket.c does something similar.
net_add_domain is called from ngs_mod_event().
However, it is not possible to remove this module because the feature to
remove a domain is missing.
switch (event) {
case MOD_LOAD:
/* Register protocol domain */
net_add_domain(&ngdomain);
break;
case MOD_UNLOAD:
/* Insure there are no open netgraph sockets */
if (!LIST_EMPTY(&ngsocklist)) {
error = EBUSY;
break;
}
#ifdef NOTYET
if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) {
/* Unregister protocol domain XXX can't do this yet.. */
if ((error = net_rm_domain(&ngdomain)) != 0)
break;
} else
#endif
error = EBUSY;
break;
I would be interested in this feature too ;-)
However there is no reference counter within the protosw structure, neither
within the domain structure. It seems to be difficult to remove them.
Moreover, how can the domains, that require a "routing layer", be loaded ?
rn_init is called only during the boot process in order to find the
max_keylen = MAX(dom->dom_maxrtkey).
Vincent
Le Mardi 14 Janvier 2003 00:53, Radoslav Vasilev a écrit :
> I'm interested in whether the following could be acomplished:
> there's KLD module, installing some new syscalls in the kernel, as well as
> installing new ``struct ipprotosw'' for some protocol or another(let's
> assume IPPROTO_UDP).
> Could we just add some code in the begging of the new protocol handler
> (counting, statistics , etc...) and call the old one after doing that. If
> possible, what should be the preparation for that last call ?
> Any help appreciated!
>
>
>
>
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