Bug 215714

Summary:	regression in kernels >=2.6.24 ipw2200s rtap iface not working
Product:	Gentoo Linux	Reporter:	whitehawk <akos.demeter>
Component:	[OLD] Core system	Assignee:	Gentoo Kernel Bug Wranglers and Kernel Maintainers <kernel>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	High
Version:	unspecified
Hardware:	x86
OS:	Linux
Whiteboard:	insvn
Package list:		Runtime testing required:	---

Description whitehawk 2008-04-01 15:28:13 UTC

The rtap0 interface can't  be brought up with ifconfig rtap0 up. I have tested it in gentoo-sources 2.6.23 and 2.6.22 and it worked. I tested gentoo-sources 2.6.24-rX and didn't have any success. I also tested vanilla-sources 2.6.25-rcX and it does not work.

~ # ifconfig rtap0 up
SIOCSIFFLAGS: Invalid argument
~ # 

the rtap0 interface exist, it is listed with ifconfig -a

Comment 1 Daniel Drake (RETIRED) gentoo-dev

2008-04-01 20:22:37 UTC

you dont need to bring it up

Comment 2 whitehawk 2008-04-02 06:01:23 UTC

Can you show me a link that states this? It is not working without being brought up. I tried wireshark. From kernel menuconfig:

CONFIG_IPW2200_PROMISCUOUS:                                                                                                            

Enables the creation of a second interface prefixed 'rtap'.                                                                              
This second interface will provide every received in radiotap                                                                          
format.                                                                                                                                 

This is useful for performing wireless network analysis while                                                                          
maintaining an active association.                                                                                                     

Example usage:                                                                                                                          
% modprobe ipw2200 rtap_iface=1                                                                                                        
% ifconfig rtap0 up                                                                                                                    
% tethereal -i rtap0

Comment 3 whitehawk 2008-04-02 18:29:06 UTC

I verified the behavior with other people. To use the rtap0 you must activate it. Only then can you capture packets with for example wireshark or airodump-ng.

Comment 4 whitehawk 2008-04-02 18:53:03 UTC

reopening it

Comment 5 Daniel Drake (RETIRED) gentoo-dev

2008-04-02 19:34:55 UTC

Sorry for incorrect diagnosis, I think I got confused with something else.

As debugged on IRC, this is another case of an all-zero mac address. Sent a patch upstream.

Comment 6 Daniel Drake (RETIRED) gentoo-dev

2008-04-19 21:19:30 UTC

Fixed in gentoo-sources-2.6.24-r6 / genpatches-2.6.24-7

Comment 7 Hendrik Lemelson 2008-07-24 14:04:02 UTC

I am having the same issue again with 2.6.24-r8.
rtap0 is there with "iwconfig" but cannot be brought up with "ifconfig rtap0 up".
Didn't the patch make it into 2.6.24-r8?