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2ef04f092c
Commit edf74df ("[pxe] Always reconstruct packet for
PXENV_GET_CACHED_INFO") fixed the problems caused by returning stale
DHCP packets (e.g. from an earlier boot attempt using a different
network device), but broke interoperability with NBPs such as WDS
which may overwrite our cached (fake) DHCP packets and expect the
modified packets to be returned by a subsequent call to
PXENV_GET_CACHED_INFO.
Fix by constructing the fake DHCP packets immediately before
transferring control to a PXE NBP. Calls to PXENV_GET_CACHED_INFO
will now never modify the cached packets.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
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