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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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29
src/interface/efi/efi_cachedhcp.c
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@@ -75,17 +75,40 @@ int efi_cachedhcp_record ( EFI_HANDLE device ) {
/* Record DHCPACK, if present */
if ( mode->DhcpAckReceived &&
( ( rc = cachedhcp_record ( virt_to_user ( &mode->DhcpAck ),
( ( rc = cachedhcp_record ( &cached_dhcpack,
virt_to_user ( &mode->DhcpAck ),
sizeof ( mode->DhcpAck ) ) ) != 0 ) ) {
DBGC ( device, "EFI %s could not record DHCPACK: %s\n",
efi_handle_name ( device ), strerror ( rc ) );
goto err_record;
goto err_dhcpack;
}
/* Record ProxyDHCPOFFER, if present */
if ( mode->ProxyOfferReceived &&
( ( rc = cachedhcp_record ( &cached_proxydhcp,
virt_to_user ( &mode->ProxyOffer ),
sizeof ( mode->ProxyOffer ) ) ) != 0)){
DBGC ( device, "EFI %s could not record ProxyDHCPOFFER: %s\n",
efi_handle_name ( device ), strerror ( rc ) );
goto err_proxydhcp;
}
/* Record PxeBSACK, if present */
if ( mode->PxeReplyReceived &&
( ( rc = cachedhcp_record ( &cached_pxebs,
virt_to_user ( &mode->PxeReply ),
sizeof ( mode->PxeReply ) ) ) != 0)){
DBGC ( device, "EFI %s could not record PXEBSACK: %s\n",
efi_handle_name ( device ), strerror ( rc ) );
goto err_pxebs;
}
/* Success */
rc = 0;
err_record:
err_pxebs:
err_proxydhcp:
err_dhcpack:
err_ipv6:
bs->CloseProtocol ( device, &efi_pxe_base_code_protocol_guid,
efi_image_handle, NULL );