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 BSD

streams

STREAMS(4)						 BSD/i386 Kernel Interfaces Manual						STREAMS(4)

NAME

     streams -- System V STREAMS networking ABI support

SYNOPSIS

     To compile support for this ABI into the kernel, place the following line in your kernel configuration file:

	   device streams

     Alternatively, to load the ABI as a module at boot time, place the following line in loader.conf(5):

	   streams_load="YES"

DESCRIPTION

     The streams module provides limited System V Release 4 STREAMS interprocess communication ABI (application binary interface) compatibility
     for userland applications.

     Internally, streams provides STREAMS handles by using socket creation kernel routines, and adding state-tracking information to the socket to
     permit manipulation by STREAMS emulation code in svr4(4).	Hence, opening a stream device produces a result similar to what would be obtained
     by calling socket(2).

     Applications should never use this interface directly: STREAMS emulation is only provided as a service to support ABI requirements in the
     SVR4 environment which svr4(4) needs to present to client binaries.

SEE ALSO

     svr4(4)

HISTORY

     System V Release 4 ABI support first appeared in FreeBSD 4.0.  The ABI was ported from an equivalent facility present in NetBSD 1.3 written
     by Christos Zoulas.

BUGS

     This whole interface is a crude hack to produce STREAMS semantics through emulation over sockets.

     Programmers who hope to be able to use this interface to provide SVR4 STREAMS services to BSD applications will be sorely disappointed.

BSD
								  March 17, 2008							       BSD