Date: Sun, 2 Nov 2008 17:38:03 -0500 (EST) From: Joe Pellegrino <jdp@elvis.rowan.edu> To: Julian Elischer <julian@elischer.org> Cc: freebsd-net@freebsd.org Subject: Re: A netgraph question. Message-ID: <Pine.GSO.4.64.0811021729030.23578@elvis.rowan.edu> In-Reply-To: <490D0CFB.5040102@elischer.org> References: <Pine.GSO.4.64.0811011759200.4676@elvis.rowan.edu> <490CEF11.4010007@elischer.org> <Pine.GSO.4.64.0811012107200.7887@elvis.rowan.edu> <490D0CFB.5040102@elischer.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sat, 1 Nov 2008, Julian Elischer wrote:
> Joe Pellegrino wrote:
>> On Sat, 1 Nov 2008, Julian Elischer wrote:
>>
> have you done man 3 netgraph to look at the netgraph management library?
>
Looked at that today and I might be able to get something going. I tried
to use the ng_echo node in a module. The code looked something like this:
#include <sys/param.h>
#include <sys/module.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_echo.h>
extern struct ng_type typestruct;
static int event_handler(struct module *module, int event, void *arg) {
int e = 0; /* Error, 0 for normal return status */
switch (event) {
case MOD_LOAD:
uprintf("Hello Free Software Magazine Readers! \n");
ng_newtype(&typestruct);
break;
case MOD_UNLOAD:
uprintf("Bye Bye FSM reader, be sure to check
http://freesoftwar
emagazine.com !\n");
break;
default:
e = EOPNOTSUPP; /* Error, Operation Not Supported */
break;
}
return(e);
}
/* The second argument of DECLARE_MODULE. */
static moduledata_t hello_conf = {
"hello_fsm", /* module name */
event_handler, /* event handler */
NULL /* extra data */
};
DECLARE_MODULE(hello_fsm, hello_conf, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
However, trying to load this module results in:
# kldload ./hello_fsm.ko
kldload: can't load ./hello_fsm.ko: No such file or directory
So to start, how can I use ng_echo in a module? According to the man 4 of
netgraph the ng_newtype should construct a new node right? And I presume
once I get that module running and an ng_echo module loaded, I'll try to
communicate with it from userspace but what about the above is incorrect?
Thanks. :)
---jdp
> for example programs, see:
> /usr/src/usr.sbin/nghook
> /usr/src/usr.sbin/ngctl
> /usr/ports/net/mpd (you'll need to download the sources with "make")
>
>
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.GSO.4.64.0811021729030.23578>