/*      $NetBSD: efipxe.c,v 1.2 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 <patrick@blueri.se>
 *
 * 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++;
        }
}

void
efi_pxe_show(void)
{
        const struct efipxeinfo *epi;
        UINT32 i, n;

        n = 0;
        TAILQ_FOREACH(epi, &efi_pxelist, list) {
                printf("pxe pxe%d", n++);
                for (i = 0; i < epi->addrsz; i++)
                        printf("%c%02x", i == 0 ? ' ' : ':', epi->mac.Addr[i]);
                printf("\n");
        }
}

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;
}