netdev - Re: [iproute2] tc action mirred question

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

Message-Id: <1252376168.5244.11.camel@dogo.mojatatu.com>
Date:	Mon, 07 Sep 2009 22:16:08 -0400
From:	jamal <hadi@...erus.ca>
To:	Xiaofei Wu <xiaofei_wu08@...oo.com>
Cc:	linux netdev <netdev@...r.kernel.org>
Subject: Re: [iproute2] tc action mirred    question

On Mon, 2009-09-07 at 09:05 -0700, Xiaofei Wu wrote:

> (1) Could I use  pedit action to modify the dst MAC, so the destination node D will accept it, 
> then forward it to node C?  

Yes, you can achieve it with pedit; 


> (or use other tools to modify the dst MAC, please give me more information)
> 

it is as usable as u32 is - you have to know your offsets
example, here's something done on an incoming packet:
=-=
#Note:
#dst MAC starts at -14
#src MAC at -8
#ethertype at -2
#
tc filter add dev eth1 parent ffff: protocol ip prio 10 u32 \
match ip src 192.168.2.11/32 flowid 1:2 \
action pedit munge offset -14 u16 set 0x0000 \
munge offset -12 u32 set 0x00000200 \
munge offset -8 u32 set 0x0aaf0100 \
munge offset -4 u32 set 0x0008eb06 pipe \
action mirred egress redirect dev eth0
----

> (2) If I use 'ifconfig wlan0 promisc ... ' on node D, would it route the mirroring packets
>  (the dst MAC is incorrect)
> to node C?

It may work.
Go and try running some experiments.

cheers,
jamal

--
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