2 * Copied from Linux Monitor (LiMon) - Networking.
4 * Copyright 1994 - 2000 Neil Russell.
6 * Copyright 2000 Roland Borde
7 * Copyright 2000 Paolo Scaffardi
8 * Copyright 2000-2002 Wolfgang Denk, wd@denx.de
9 * SPDX-License-Identifier: GPL-2.0
15 static ushort PingSeqNo;
17 /* The ip address to ping */
20 static void set_icmp_header(uchar *pkt, IPaddr_t dest)
23 * Construct an IP and ICMP header.
25 struct ip_hdr *ip = (struct ip_hdr *)pkt;
26 struct icmp_hdr *icmp = (struct icmp_hdr *)(pkt + IP_HDR_SIZE);
28 net_set_ip_header(pkt, dest, NetOurIP);
30 ip->ip_len = htons(IP_ICMP_HDR_SIZE);
31 ip->ip_p = IPPROTO_ICMP;
32 ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
34 icmp->type = ICMP_ECHO_REQUEST;
38 icmp->un.echo.sequence = htons(PingSeqNo++);
39 icmp->checksum = compute_ip_checksum(icmp, ICMP_HDR_SIZE);
42 static int ping_send(void)
47 /* XXX always send arp request */
49 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &NetPingIP);
51 NetArpWaitPacketIP = NetPingIP;
53 eth_hdr_size = NetSetEther(NetTxPacket, NetEtherNullAddr, PROT_IP);
54 pkt = (uchar *)NetTxPacket + eth_hdr_size;
56 set_icmp_header(pkt, NetPingIP);
58 /* size of the waiting packet */
59 NetArpWaitTxPacketSize = eth_hdr_size + IP_ICMP_HDR_SIZE;
61 /* and do the ARP request */
63 NetArpWaitTimerStart = get_timer(0);
65 return 1; /* waiting */
68 static void ping_timeout(void)
71 net_set_state(NETLOOP_FAIL); /* we did not get the reply */
76 printf("Using %s device\n", eth_get_name());
77 NetSetTimeout(10000UL, ping_timeout);
82 void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
84 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
88 switch (icmph->type) {
90 src_ip = NetReadIP((void *)&ip->ip_src);
91 if (src_ip == NetPingIP)
92 net_set_state(NETLOOP_SUCCESS);
94 case ICMP_ECHO_REQUEST:
95 eth_hdr_size = net_update_ether(et, et->et_src, PROT_IP);
97 debug_cond(DEBUG_DEV_PKT, "Got ICMP ECHO REQUEST, return "
98 "%d bytes\n", eth_hdr_size + len);
102 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src);
103 NetCopyIP((void *)&ip->ip_src, &NetOurIP);
104 ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
106 icmph->type = ICMP_ECHO_REPLY;
108 icmph->checksum = compute_ip_checksum(icmph, len - IP_HDR_SIZE);
109 NetSendPacket((uchar *)et, eth_hdr_size + len);