netdev - IFF_PROMISC again

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1178044568.7116.14.camel@abraxas.dyn-o-saur.com>
Date:	Tue, 01 May 2007 15:36:08 -0300
From:	Martín Ferrari <martin.ferrari@...il.com>
To:	linux-net@...r.kernel.org, netdev@...r.kernel.org
Subject: IFF_PROMISC again

Hi, for the nth time I send this email, hoping that majordomo won't eat
it again.

I know this has been extensibly discussed circa 2001, but I found that
there's still problems: in debian (at least) neither ifconfig nor ip
can tell that the interface is in promiscuous mode.

I know about the deprecation of IFF_PROMISC, but I couldn't find out
which is the current way of knowing the real state of the interface. I
want to fix ifconfig, so this is not an issue of
PACKET_(ADD|REMOVE)_MEMBERSHIP, I need to query the real device state.

Also, it's unclear to me what happens when you set/reset IFF_PROMISC
and then libpcap fiddles with membership. Is this documented
somewhere?

It has been said many times that ip should give this information. I
cannot see this:

$ sudo tcpdump -ni eth2 port 3333 &
$ dmesg |tail -2
device eth2 entered promiscuous mode
audit(1175904782.767:40): dev=eth2 prom=256 old_prom=0 auid=4294967295
$ ip link show eth2
4: eth2: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen
1000
   link/ether 00:18:de:81:24:a2 brd ff:ff:ff:ff:ff:ff
$ ip -V
ip utility, iproute2-ss060323

I think that is a problem for user tools to not know about this, and I
want to fix them. I don't know how. Can anyone give me a pointer?

Thanks, Martín.

-- 
Martín Ferrari <martin.ferrari@...il.com>

-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html