| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Copyright 2018 Lothar Felten, lothar.felten@gmail.com |
| */ |
| |
| #include <command.h> |
| #include <env.h> |
| #include <net.h> |
| #include "wol.h" |
| |
| static ulong wol_timeout = WOL_DEFAULT_TIMEOUT; |
| |
| /* |
| * Check incoming Wake-on-LAN packet for: |
| * - sync bytes |
| * - sixteen copies of the target MAC address |
| * |
| * @param wol Wake-on-LAN packet |
| * @param len Packet length |
| */ |
| static int wol_check_magic(struct wol_hdr *wol, unsigned int len) |
| { |
| int i; |
| |
| if (len < sizeof(struct wol_hdr)) |
| return 0; |
| |
| for (i = 0; i < WOL_SYNC_COUNT; i++) |
| if (wol->wol_sync[i] != WOL_SYNC_BYTE) |
| return 0; |
| |
| for (i = 0; i < WOL_MAC_REPETITIONS; i++) |
| if (memcmp(&wol->wol_dest[i * ARP_HLEN], |
| net_ethaddr, ARP_HLEN) != 0) |
| return 0; |
| |
| return 1; |
| } |
| |
| void wol_receive(struct ip_udp_hdr *ip, unsigned int len) |
| { |
| struct wol_hdr *wol; |
| |
| wol = (struct wol_hdr *)ip; |
| |
| if (!wol_check_magic(wol, len)) |
| return; |
| |
| /* save the optional password using the ether-wake formats */ |
| /* don't check for exact length, the packet might have padding */ |
| if (len >= (sizeof(struct wol_hdr) + WOL_PASSWORD_6B)) { |
| eth_env_set_enetaddr("wolpassword", wol->wol_passwd); |
| } else if (len >= (sizeof(struct wol_hdr) + WOL_PASSWORD_4B)) { |
| char buffer[16]; |
| struct in_addr *ip = (struct in_addr *)(wol->wol_passwd); |
| |
| ip_to_string(*ip, buffer); |
| env_set("wolpassword", buffer); |
| } |
| net_set_state(NETLOOP_SUCCESS); |
| } |
| |
| static void wol_udp_handler(uchar *pkt, unsigned int dest, struct in_addr sip, |
| unsigned int src, unsigned int len) |
| { |
| struct wol_hdr *wol; |
| |
| wol = (struct wol_hdr *)pkt; |
| |
| /* UDP destination port must be 0, 7 or 9 */ |
| if (dest != 0 && dest != 7 && dest != 9) |
| return; |
| |
| if (!wol_check_magic(wol, len)) |
| return; |
| |
| net_set_state(NETLOOP_SUCCESS); |
| } |
| |
| void wol_set_timeout(ulong timeout) |
| { |
| wol_timeout = timeout; |
| } |
| |
| static void wol_timeout_handler(void) |
| { |
| eth_halt(); |
| net_set_state(NETLOOP_FAIL); |
| } |
| |
| void wol_start(void) |
| { |
| net_set_timeout_handler(wol_timeout, wol_timeout_handler); |
| net_set_udp_handler(wol_udp_handler); |
| } |