LXR uboot/net/wol.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright 2018 Lothar Felten, lothar.felten@gmail.com
   4 */
   5
   6#include <command.h>
   7#include <env.h>
   8#include <net.h>
   9#include "wol.h"
  10
  11static ulong wol_timeout = WOL_DEFAULT_TIMEOUT;
  12
  13/*
  14 * Check incoming Wake-on-LAN packet for:
  15 * - sync bytes
  16 * - sixteen copies of the target MAC address
  17 *
  18 * @param wol Wake-on-LAN packet
  19 * @param len Packet length
  20 */
  21static int wol_check_magic(struct wol_hdr *wol, unsigned int len)
  22{
  23        int i;
  24
  25        if (len < sizeof(struct wol_hdr))
  26                return 0;
  27
  28        for (i = 0; i < WOL_SYNC_COUNT; i++)
  29                if (wol->wol_sync[i] != WOL_SYNC_BYTE)
  30                        return 0;
  31
  32        for (i = 0; i < WOL_MAC_REPETITIONS; i++)
  33                if (memcmp(&wol->wol_dest[i * ARP_HLEN],
  34                           net_ethaddr, ARP_HLEN) != 0)
  35                        return 0;
  36
  37        return 1;
  38}
  39
  40void wol_receive(struct ip_udp_hdr *ip, unsigned int len)
  41{
  42        struct wol_hdr *wol;
  43
  44        wol = (struct wol_hdr *)ip;
  45
  46        if (!wol_check_magic(wol, len))
  47                return;
  48
  49        /* save the optional password using the ether-wake formats */
  50        /* don't check for exact length, the packet might have padding */
  51        if (len >= (sizeof(struct wol_hdr) + WOL_PASSWORD_6B)) {
  52                eth_env_set_enetaddr("wolpassword", wol->wol_passwd);
  53        } else if (len >= (sizeof(struct wol_hdr) + WOL_PASSWORD_4B)) {
  54                char buffer[16];
  55                struct in_addr *ip = (struct in_addr *)(wol->wol_passwd);
  56
  57                ip_to_string(*ip, buffer);
  58                env_set("wolpassword", buffer);
  59        }
  60        net_set_state(NETLOOP_SUCCESS);
  61}
  62
  63static void wol_udp_handler(uchar *pkt, unsigned int dest, struct in_addr sip,
  64                            unsigned int src, unsigned int len)
  65{
  66        struct wol_hdr *wol;
  67
  68        wol = (struct wol_hdr *)pkt;
  69
  70        /* UDP destination port must be 0, 7 or 9 */
  71        if (dest != 0 && dest != 7 && dest != 9)
  72                return;
  73
  74        if (!wol_check_magic(wol, len))
  75                return;
  76
  77        net_set_state(NETLOOP_SUCCESS);
  78}
  79
  80void wol_set_timeout(ulong timeout)
  81{
  82        wol_timeout = timeout;
  83}
  84
  85static void wol_timeout_handler(void)
  86{
  87        eth_halt();
  88        net_set_state(NETLOOP_FAIL);
  89}
  90
  91void wol_start(void)
  92{
  93        net_set_timeout_handler(wol_timeout, wol_timeout_handler);
  94        net_set_udp_handler(wol_udp_handler);
  95}
  96