AIX STREAMS driver question Post: 302504990

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Operating Systems AIX AIX STREAMS driver question Post 302504990 by rocktilldie on Tuesday 15th of March 2011 11:32:03 PM

03-16-2011

Registered User

AIX STREAMS driver question

Hi all,

I have a AIX kernel STREAMS question need your help,
I need to implement a firewall on AIX and get packet raw data then decide pass or drop it,
I've seen similiar firewall code on HP-UX,
on HP-UX, you have to implement a "dlpi STREAMS driver", and specify it as a "dlpi" driver in metadata,
then you can get the packet in your STREAMS driver's read and write callback function just like below sample driver.

I found following sample code in IBM site,

Code:

#include <errno.h>
#include <sys/stream.h>
static int passclose(), passopen
(), passrput(), passwput();
static struct module_info minfo = { 0, "pass", 0, INFPSZ, 2048, 128 };
static struct qinit rinit = { passrput, 0, passopen, passclose, 0, &minfo };
static struct qinit winit = { passwput, 0, 0, 0, 0, &minfo };
struct streamtab passinfo = { &rinit, &winit };
static int
passclose (queue_t *q)
{
return 0;
}
static int
passopen (queue_t *q, dev_t *devp, int flag, int sflag, cred_t *credp)
{
return 0;
}
static int
passrput (queue_t *q, mblk_t *mp)
{
putnext(q, mp);
return 0;
}
static int
passwput (queue_t *q, mblk_t *mp)
{
putnext(q, mp);
return 0;
}

But I have two question
(1) I don't know how to register this sample driver as a dlpi driver on AIX,
Do I have to specify something in struct module_info? But seems there's no module_info declaration on website, where can I get it?
or do I need specify something when call strload?

(2) Writing a dlpi STREAS driver to hook network packet on AIX is a feasible way as a firewall?

Thanks a lot for your information.

Ryan

Last edited by pludi; 03-16-2011 at 05:00 AM.. Reason: code tags, please

rocktilldie

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LEARN ABOUT OSF1

pseudo

pseudo(1)						      General Commands Manual							 pseudo(1)

NAME

       pseudo - Starts a non-STREAMS pty interface for a STREAMS device

SYNOPSIS

       pseudo [-l] [-shell shell]

OPTIONS

       Starts  a shell process as the login shell. By default, the command starts this process as an interactive shell.  Specifies the shell to be
       started.  By default, the command starts the shell set by the SHELL environment variable.

DESCRIPTION

       The pseudo command provides an appropriate interface for STREAMS tty devices that are installed on  systems  configured	to  use  the  non-
       STREAMS pty driver.

       The  pseudo  command  opens a pair of master and slave pty devices, and starts a shell process. The command's options allow you to override
       the default shell specification and to specify that the process be started as a login shell.

NOTES

       The pseudo command is available only when one or more of the Tru64 UNIX optional subsets with worldwide support software are  installed	on
       your system.

       In  order  for the pseudo command to provide a non-STREAMS pty interface for STREAMS devices, the system must be configured to use the non-
       STREAMS pty driver. If the system is configured to use the STREAMS pty driver, the command provides a STREAMS pty interface.

SEE ALSO

       Commands:  stty(1)

       Interfaces:  pty(7)

																	 pseudo(1)