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[efi] Record cached ProxyDHCPOFFER and PXEBSACK, if present

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Commit cd3de55 ("[efi] Record cached DHCPACK from loaded image's
device handle, if present") added the ability for a chainloaded UEFI
iPXE to reuse an IPv4 address and DHCP options previously obtained by
a built-in PXE stack, without needing to perform a second DHCP
request.

Extend this to also record the cached ProxyDHCPOFFER and PXEBSACK
obtained from the EFI_PXE_BASE_CODE_PROTOCOL instance installed on the
loaded image's device handle, if present.

This allows a chainloaded UEFI iPXE to reuse a boot filename or other
options that were provided via a ProxyDHCP or PXE boot server
mechanism, rather than by standard DHCP.

Tested-by: Andreas Hammarskjöld <junior@2PintSoftware.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2021-07-23 11:32:04 +01:00
parent db6310c3e5
commit e09e1142a3
5 changed files with 167 additions and 51 deletions
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3
src/arch/x86/interface/pcbios/bios_cachedhcp.c
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@@ -59,7 +59,8 @@ static void cachedhcp_init ( void ) {
}
/* Record cached DHCPACK */
if ( ( rc = cachedhcp_record ( phys_to_user ( cached_dhcpack_phys ),
if ( ( rc = cachedhcp_record ( &cached_dhcpack,
phys_to_user ( cached_dhcpack_phys ),
sizeof ( BOOTPLAYER_t ) ) ) != 0 ) {
DBGC ( colour, "CACHEDHCP could not record DHCPACK: %s\n",
strerror ( rc ) );