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 <net.h>
9 #include <environment.h>
10 #include "wol.h"
11
12 static 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 */
wol_check_magic(struct wol_hdr * wol,unsigned int len)22 static 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
wol_receive(struct ip_udp_hdr * ip,unsigned int len)41 void 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
wol_udp_handler(uchar * pkt,unsigned int dest,struct in_addr sip,unsigned int src,unsigned int len)64 static 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
wol_set_timeout(ulong timeout)81 void wol_set_timeout(ulong timeout)
82 {
83 wol_timeout = timeout;
84 }
85
wol_timeout_handler(void)86 static void wol_timeout_handler(void)
87 {
88 eth_halt();
89 net_set_state(NETLOOP_FAIL);
90 }
91
wol_start(void)92 void wol_start(void)
93 {
94 net_set_timeout_handler(wol_timeout, wol_timeout_handler);
95 net_set_udp_handler(wol_udp_handler);
96 }
97