From: "maria maria" <for_spam2004@yahoo.it>
To: user-mode-linux-devel@lists.sourceforge.net
Subject: [uml-devel] Implementing 802.11...
Date: Fri, 14 May 2004 20:24:47 +0200 (CEST) [thread overview]
Message-ID: <20040514182447.56774.qmail@web25106.mail.ukl.yahoo.com> (raw)
Hi,
I'm developing an implementation of 802.11 inside
UML, to make it able to emulate a wireless lan.
I'm modifing the "daemon_read" and "daemon_write"
functions inside "daemon_kern.c".
In "daemon_write":
before to send a packet, I enlarge it and I insert the
new 802.11 header. Then I put it in a list of sk_buff,
and if the channel is free, I send the packet. By now
I'm just triing to put the sk_buff packet in a list
and to send it immediatly, whithout run a collision
avoidance algorithm.
In "daemon_read"
At the arrival of a packet, I extract the 802.11
header, I compress the packet deleting the bytes
concerning the 802.11 header, and I manage the packet
following the protocol (send ack or cts, etc...)
By now it just sends an ACK for each not broadcast
packet it receives.
My question is: I'm having some problems in managing
the sk_buff structures: using the functions in
sk_buff.h, I have a kernel panic :
Warning: kfree_skb passed an skb still on a list (from
a0126b3b)
Kernel panic: kernel BUG at skbuff.c:316!
Does someone have some idea about the cause of this
problem?
Thank in advance,
Maria
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next reply other threads:[~2004-05-14 18:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-14 18:24 maria maria [this message]
2004-05-20 0:50 ` [uml-devel] Implementing 802.11 Jeff Dike
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