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 <common.h>
   7#include <command.h>
   8#include <env.h>
   9#include <net.h>
  10#include "wol.h"
  11
  12static ulong wol_timeout = WOL_DEFAULT_TIMEOUT;
  13
  14/*
  15 * Check incoming Wake-on-LAN packet for:
  16 * - sync bytes
  17 * - sixteen copies of the target MAC address
  18 *
  19 * @param wol Wake-on-LAN packet
  20 * @param len Packet length
  21 */
  22static int wol_check_magic(struct wol_hdr *wol, unsigned int len)
  23{
  24        int i;
  25
  26        if (len < sizeof(struct wol_hdr))
  27                return 0;
  28
  29        for (i = 0; i < WOL_SYNC_COUNT; i++)
  30                if (wol->wol_sync[i] != WOL_SYNC_BYTE)
  31                        return 0;
  32
  33        for (i = 0; i < WOL_MAC_REPETITIONS; i++)
  34                if (memcmp(&wol->wol_dest[i * ARP_HLEN],
  35                           net_ethaddr, ARP_HLEN) != 0)
  36                        return 0;
  37
  38        return 1;
  39}
  40
  41void wol_receive(struct ip_udp_hdr *ip, unsigned int len)
  42{
  43        struct wol_hdr *wol;
  44
  45        wol = (struct wol_hdr *)ip;
  46
  47        if (!wol_check_magic(wol, len))
  48                return;
  49
  50        /* save the optional password using the ether-wake formats */
  51        /* don't check for exact length, the packet might have padding */
  52        if (len >= (sizeof(struct wol_hdr) + WOL_PASSWORD_6B)) {
  53                eth_env_set_enetaddr("wolpassword", wol->wol_passwd);
  54        } else if (len >= (sizeof(struct wol_hdr) + WOL_PASSWORD_4B)) {
  55                char buffer[16];
  56                struct in_addr *ip = (struct in_addr *)(wol->wol_passwd);
  57
  58                ip_to_string(*ip, buffer);
  59                env_set("wolpassword", buffer);
  60        }
  61        net_set_state(NETLOOP_SUCCESS);
  62}
  63
  64static void wol_udp_handler(uchar *pkt, unsigned int dest, struct in_addr sip,
  65                            unsigned int src, unsigned int len)
  66{
  67        struct wol_hdr *wol;
  68
  69        wol = (struct wol_hdr *)pkt;
  70
  71        /* UDP destination port must be 0, 7 or 9 */
  72        if (dest != 0 && dest != 7 && dest != 9)
  73                return;
  74
  75        if (!wol_check_magic(wol, len))
  76                return;
  77
  78        net_set_state(NETLOOP_SUCCESS);
  79}
  80
  81void wol_set_timeout(ulong timeout)
  82{
  83        wol_timeout = timeout;
  84}
  85
  86static void wol_timeout_handler(void)
  87{
  88        eth_halt();
  89        net_set_state(NETLOOP_FAIL);
  90}
  91
  92void wol_start(void)
  93{
  94        net_set_timeout_handler(wol_timeout, wol_timeout_handler);
  95        net_set_udp_handler(wol_udp_handler);
  96}
  97