1// SPDX-License-Identifier: GPL-2.0
2/*
3 *	Copied from Linux Monitor (LiMon) - Networking.
4 *
5 *	Copyright 1994 - 2000 Neil Russell.
6 *	(See License)
7 *	Copyright 2000 Roland Borde
8 *	Copyright 2000 Paolo Scaffardi
9 *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de
10 */
11
12#include "ping.h"
13#include "arp.h"
14#include <log.h>
15#include <net.h>
16
17static ushort ping_seq_number;
18
19/* The ip address to ping */
20struct in_addr net_ping_ip;
21
22static void set_icmp_header(uchar *pkt, struct in_addr dest)
23{
24	/*
25	 *	Construct an IP and ICMP header.
26	 */
27	struct icmp_hdr *icmp = (struct icmp_hdr *)(pkt + IP_HDR_SIZE);
28
29	net_set_ip_header(pkt, dest, net_ip, IP_ICMP_HDR_SIZE, IPPROTO_ICMP);
30
31	icmp->type = ICMP_ECHO_REQUEST;
32	icmp->code = 0;
33	icmp->checksum = 0;
34	icmp->un.echo.id = 0;
35	icmp->un.echo.sequence = htons(ping_seq_number++);
36	icmp->checksum = compute_ip_checksum(icmp, ICMP_HDR_SIZE);
37}
38
39static int ping_send(void)
40{
41	uchar *pkt;
42	int eth_hdr_size;
43
44	/* XXX always send arp request */
45
46	debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &net_ping_ip);
47
48	net_arp_wait_packet_ip = net_ping_ip;
49
50	eth_hdr_size = net_set_ether(net_tx_packet, net_null_ethaddr, PROT_IP);
51	pkt = (uchar *)net_tx_packet + eth_hdr_size;
52
53	set_icmp_header(pkt, net_ping_ip);
54
55	/* size of the waiting packet */
56	arp_wait_tx_packet_size = eth_hdr_size + IP_ICMP_HDR_SIZE;
57
58	/* and do the ARP request */
59	arp_wait_try = 1;
60	arp_wait_timer_start = get_timer(0);
61	arp_request();
62	return 1;	/* waiting */
63}
64
65static void ping_timeout_handler(void)
66{
67	eth_halt();
68	net_set_state(NETLOOP_FAIL);	/* we did not get the reply */
69}
70
71void ping_start(void)
72{
73	printf("Using %s device\n", eth_get_name());
74	net_set_timeout_handler(10000UL, ping_timeout_handler);
75
76	ping_send();
77}
78
79void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
80{
81	struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
82	struct in_addr src_ip;
83	int eth_hdr_size;
84	uchar *tx_packet;
85
86	switch (icmph->type) {
87	case ICMP_ECHO_REPLY:
88		src_ip = net_read_ip((void *)&ip->ip_src);
89		if (src_ip.s_addr == net_ping_ip.s_addr)
90			net_set_state(NETLOOP_SUCCESS);
91		return;
92	case ICMP_ECHO_REQUEST:
93		if (net_ip.s_addr == 0)
94			return;
95
96		eth_hdr_size = net_update_ether(et, et->et_src, PROT_IP);
97
98		debug_cond(DEBUG_DEV_PKT,
99			   "Got ICMP ECHO REQUEST, return %d bytes\n",
100			   eth_hdr_size + len);
101
102		ip->ip_sum = 0;
103		ip->ip_off = 0;
104		net_copy_ip((void *)&ip->ip_dst, &ip->ip_src);
105		net_copy_ip((void *)&ip->ip_src, &net_ip);
106		ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
107
108		icmph->type = ICMP_ECHO_REPLY;
109		icmph->checksum = 0;
110		icmph->checksum = compute_ip_checksum(icmph, len - IP_HDR_SIZE);
111
112		tx_packet = net_get_async_tx_pkt_buf();
113		memcpy(tx_packet, et, eth_hdr_size + len);
114		net_send_packet(tx_packet, eth_hdr_size + len);
115		return;
116/*	default:
117		return;*/
118	}
119}
120