/*      $NetBSD: efipxe.c,v 1.3 2023/07/24 08:30:42 rin Exp $   */
/*      $OpenBSD: efipxe.c,v 1.3 2018/01/30 20:19:06 naddy Exp $        */

/*
* Copyright (c) 2017 Patrick Wildt <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include <sys/queue.h>

#include "efiboot.h"

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <lib/libsa/bootp.h>    /* for VM_RFC1048 */


struct efipxeinfo {
       TAILQ_ENTRY(efipxeinfo) list;

       EFI_PXE_BASE_CODE       *pxe;
       EFI_SIMPLE_NETWORK      *net;
       EFI_MAC_ADDRESS         mac;
       UINT32                  addrsz;
};
TAILQ_HEAD(efipxeinfo_lh, efipxeinfo);
static struct efipxeinfo_lh efi_pxelist;
static int nefipxes;

void
efi_pxe_probe(void)
{
       struct efipxeinfo *epi;
       EFI_PXE_BASE_CODE *pxe;
       EFI_DEVICE_PATH *dp;
       EFI_SIMPLE_NETWORK *net;
       EFI_HANDLE *handles;
       EFI_STATUS status;
       UINTN nhandles;
       int i, depth;
       bool found;

       TAILQ_INIT(&efi_pxelist);

       status = LibLocateHandle(ByProtocol, &PxeBaseCodeProtocol, NULL,
           &nhandles, &handles);
       if (EFI_ERROR(status))
               return;

       for (i = 0; i < nhandles; i++) {
               status = uefi_call_wrapper(BS->HandleProtocol, 3, handles[i],
                   &DevicePathProtocol, (void **)&dp);
               if (EFI_ERROR(status))
                       continue;

               depth = efi_device_path_depth(efi_bootdp,
                   MESSAGING_DEVICE_PATH);
               if (efi_device_path_ncmp(efi_bootdp, dp, depth))
                       continue;

               status = uefi_call_wrapper(BS->HandleProtocol, 3, handles[i],
                   &PxeBaseCodeProtocol, (void **)&pxe);
               if (EFI_ERROR(status))
                       continue;

               if (pxe->Mode == NULL ||
                   (!pxe->Mode->DhcpAckReceived && !pxe->Mode->PxeReplyReceived))
                       continue;

               status = uefi_call_wrapper(BS->HandleProtocol, 3, handles[i],
                   &SimpleNetworkProtocol, (void **)&net);
               if (EFI_ERROR(status))
                       continue;

               if (net->Mode == NULL)
                       continue;

               found = false;
               TAILQ_FOREACH(epi, &efi_pxelist, list) {
                       if (net->Mode->HwAddressSize == epi->addrsz &&
                           memcmp(net->Mode->CurrentAddress.Addr, epi->mac.Addr,
                             net->Mode->HwAddressSize) == 0) {
                               found = true;
                               break;
                       }
               }
               if (found)
                       continue;

               epi = alloc(sizeof(*epi));
               if (epi == NULL)
                       continue;

               memset(epi, 0, sizeof(*epi));
               epi->pxe = pxe;
               epi->net = net;
               epi->addrsz = net->Mode->HwAddressSize;
               memcpy(epi->mac.Addr, net->Mode->CurrentAddress.Addr, epi->addrsz);

               TAILQ_INSERT_TAIL(&efi_pxelist, epi, list);
               nefipxes++;
       }
}

bool
efi_pxe_match_booted_interface(const EFI_MAC_ADDRESS *mac, UINT32 addrsz)
{
       const struct efipxeinfo *epi;

       TAILQ_FOREACH(epi, &efi_pxelist, list) {
               if (addrsz == epi->addrsz &&
                   memcmp(mac->Addr, epi->mac.Addr, addrsz) == 0)
                       return true;
       }
       return false;
}