[lwip-devel] [bugs #11400] ARP multi-packet-queue modifies TCP unsent/unacked segment packet pbuf chain into packet queue

[Leon Woestenberg]

This mail is an automated notification from the bugs tracker
 of the project: lwIP - A Lightweight TCP/IP stack.

/**************************************************************************/
[bugs #11400] Latest Modifications:

Changes by: 
                Leon Woestenberg <address@hidden>
'Date: 
                Mon 01/03/2005 at 18:05 (Europe/Amsterdam)

            What     | Removed                   | Added
---------------------------------------------------------------------------
          Resolution | None                      | Postponed


------------------ Additional Follow-up Comments ----------------------------
Bug is reported to dissappear when the ARP queueing is limited to one packet 
per entry, so I limited the implementation to that. That fixes the bug, but 
leaves future work to see if a multi-packet queue can be implemented neatly.






/**************************************************************************/
[bugs #11400] Full Item Snapshot:

URL: <http://savannah.nongnu.org/bugs/?func=detailitem&item_id=11400>
Project: lwIP - A Lightweight TCP/IP stack
Submitted by: Leon Woestenberg
On: Sun 12/26/2004 at 15:52

Category:  ARP
Severity:  5 - Average
Item Group:  Faulty Behaviour
Resolution:  Postponed
Privacy:  Public
Assigned to:  leonwoestenberg
Status:  Open


Summary:  ARP multi-packet-queue modifies TCP unsent/unacked segment packet 
pbuf chain into packet queue

Original Submission:  When multiple packets are queued on one ARP entry, the 
first packet has a next pointer pointing to the next packet. 

However, if this was a queued TCP segment, we are modifying it, without TCP 
knowing about this.

Possible solutions: disallow multiple packets on the ARP queue, or modify TCP 
to know about packet queues.

Optimal solution is probably to design a seperate struct for ARP queues, much 
like the 'struct tcp_seg' linked list.

Follow-up Comments
------------------


-------------------------------------------------------
Date: Mon 01/03/2005 at 18:05       By: Leon Woestenberg <likewise>
Bug is reported to dissappear when the ARP queueing is limited to one packet 
per entry, so I limited the implementation to that. That fixes the bug, but 
leaves future work to see if a multi-packet queue can be implemented neatly.












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