Any update??
From: Ari Zigler [mailto:a...@mellanox.com]
Sent: Tuesday, June 25, 2013 6:36 PM
To: edk2-devel@lists.sourceforge.net
Subject: [edk2] [PATCH] Mtftpv6Dxe retransmission mechanism
Hi,
Please review the attached patch for Mtftp6Dxe driver.
The issue:
1. TFTP protocol is based upon UDP, which means no reliability guaranteed
from network stack.
2. Upon each successful received data packet, the client sends an ACK and
restarting a timeout timer.
3. Once the timer hit the timeout, the client retransmits the last ACK
message and restarting the timeout timer. This step happens RETRY_TIMES times.
4. Mtftp6Dxe implementation has a bug that in step 3 instead of sending
the last ACK, it sends the current session's first packet, which is TFTP RReq
(TFTP Read Request), which, in turn, evaluates to a violation of the TFTP
protocol and causes it's undefined behavior.
5. A fix to the above is in the patch provided, which ensures the last
ACKed packet is sent on retransmission.
Ari
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