[syslinux] syslinux.efi pxeboot across multiple subnets

Celelibi celelibi at gmail.com
Fri Nov 8 18:18:33 PST 2013

I tried the patch from hpa directly on branch firmware and I get a
different (non-working) behavior.
syslinux.efi is correctly downloaded and my tftp server receive
requests for ldlinux.e64 and acknowledge options, but receive no
response at all.

Actually, what happen is that before any packet is actually sent (and
Transmit is called), GetModeData return a StationPort = 0. Leading to
received packets being discarded by the firmware because of the
non-matching port and the absence of AcceptAnyPort flag.
Local port, thus, can't be saved before the first call to
core_udp_send or core_udp_sendto.

Two possible solutions I see:
1) Handle the local port "by hand" instead of relying on the EFI
implementation to chose it.
2) Save the StationPort as soon as it is known similarly to what is
currently done.

2013/11/9, H. Peter Anvin <hpa at zytor.com>:
> On 11/08/2013 03:35 PM, Geert Stappers wrote:
>> Op 2013-11-08 om 10:48 schreef H. Peter Anvin:
>>> Thank you for posting the pcap files, by the way.  Analyzing them in
>>> Wireshark is so much nicer than reading the text output of tcpdump.
>> Fetch the new capture with
>>  wget -O pcap2.zip http://ge.tt/api/1/files/136167y/0/blob?downlad
>> The capture[1] shows two[2] TFTP transmissions of sles113/syslinux.efi,
>> but nothing after that. As if syslinux.efi was crashed.
>> Groeten
>> Geert Stappers
>> Notes
>> [1] With a snaplength of 96 bytes or something.
>>     Add -S0 to tcpdump to get the full network packets.
>> [2] A previous posting says that the repeated transmission
>>     is an artifact of the firmware.
> syslinux.efi either crashed or just can't get packets out.  Either of
> which is bad, obviously.
> 	-hpa
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