[ipxe-devel] - uuid mangle does not show correctly for my hp elitebook 8440p

[Torgeir.Wulfsberg at kongsberg.com]

Hi!

I have an HP Elitebook 8440p, where iPXE does not display the correct UUID for this machine. Searching through the ipxe git repo, I've located this commit.
https://git.ipxe.org/ipxe.git/commitdiff/9e896d0eeaa07d47b2bed4c92072fd638ce3eb55

Anything before this commit, and iPXE does show the correct UUID for my 8440p.

Correct UUID from BIOS:
00112233-4455-6677-8899-aabbccddeeff

iPXE displays it like this:
33221100-5544-7766-8899-aabbccddeeff

It seems to be correctly on some other laptops I have here at work (nc6400, 8540w, 8470p), both older and newer than my 8440p.

Anything I can do to help debug what cause this problem (I have tried iPXE from the newest available commit, to this date)?

--Torgeir


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Today's Topics:

   1. [PATCH] IPv6 checksum invalid for UDP packets
      (Yoshinobu Takenaga (takenaga))


----------------------------------------------------------------------

Message: 1
Date: Sun, 19 Jul 2015 22:08:52 +0000
From: "Yoshinobu Takenaga (takenaga)" <takenaga at cisco.com>
To: "ipxe-devel at lists.ipxe.org" <ipxe-devel at lists.ipxe.org>
Subject: [ipxe-devel] [PATCH] IPv6 checksum invalid for UDP packets
Message-ID: <80B139A1-E7F1-4AE8-A0E6-D700BCCFB66B at cisco.com>
Content-Type: text/plain; charset="utf-8"

Hi,

We found a bug in IPv6 code. Issue was realized when TFTP download stopped while chsum value was being rolled over.

Problem is in IPv6/UDP cksum calculation logic.
Made it compliant to RFC2460 fixed the issue.


Signed-off-by: TAKENAGA Yoshinobu <takenaga at cisco.com>
---
src/net/ipv6.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/src/net/ipv6.c b/src/net/ipv6.c index c5bead1..5fc61df 100644
--- a/src/net/ipv6.c
+++ b/src/net/ipv6.c
@@ -523,6 +523,9 @@ static int ipv6_tx ( struct io_buffer *iobuf,
                *trans_csum = ipv6_pshdr_chksum ( iphdr, len,
                                                  tcpip_protocol->tcpip_proto,
                                                  *trans_csum );
+               /* RFC 2460 8.1: IPV6/UDP csum can't be zero */
+               if ( *trans_csum == 0 && tcpip_protocol->tcpip_proto == IP_UDP )
+                       *trans_csum = 0xFFFF;
        }

        /* Print IPv6 header for debugging */
--
1.9.1



// Thanks,
// Takenaga



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