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
14 static ushort PingSeqNo;
16 /* The ip address to ping */
19 static void set_icmp_header(uchar *pkt, IPaddr_t dest)
22 * Construct an IP and ICMP header.
24 struct ip_hdr *ip = (struct ip_hdr *)pkt;
25 struct icmp_hdr *icmp = (struct icmp_hdr *)(pkt + IP_HDR_SIZE);
27 net_set_ip_header(pkt, dest, NetOurIP);
29 ip->ip_len = htons(IP_ICMP_HDR_SIZE);
30 ip->ip_p = IPPROTO_ICMP;
31 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE >> 1);
33 icmp->type = ICMP_ECHO_REQUEST;
37 icmp->un.echo.sequence = htons(PingSeqNo++);
38 icmp->checksum = ~NetCksum((uchar *)icmp, ICMP_HDR_SIZE >> 1);
41 static int ping_send(void)
46 /* XXX always send arp request */
48 memcpy(mac, NetEtherNullAddr, 6);
50 debug("sending ARP for %pI4\n", &NetPingIP);
52 NetArpWaitPacketIP = NetPingIP;
53 NetArpWaitPacketMAC = mac;
55 pkt = NetArpWaitTxPacket;
56 pkt += NetSetEther(pkt, mac, PROT_IP);
58 set_icmp_header(pkt, NetPingIP);
60 /* size of the waiting packet */
61 NetArpWaitTxPacketSize =
62 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + 8;
64 /* and do the ARP request */
66 NetArpWaitTimerStart = get_timer(0);
68 return 1; /* waiting */
71 static void ping_timeout(void)
74 NetState = NETLOOP_FAIL; /* we did not get the reply */
77 static void ping_handler(uchar *pkt, unsigned dest, IPaddr_t sip,
78 unsigned src, unsigned len)
83 NetState = NETLOOP_SUCCESS;
88 printf("Using %s device\n", eth_get_name());
89 NetSetTimeout(10000UL, ping_timeout);
90 NetSetHandler(ping_handler);
95 void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
97 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
100 switch (icmph->type) {
101 case ICMP_ECHO_REPLY:
103 * IP header OK. Pass the packet to the
106 /* XXX point to ip packet */
107 src_ip = NetReadIP((void *)&ip->ip_src);
108 NetGetHandler()((uchar *)ip, 0, src_ip, 0, 0);
110 case ICMP_ECHO_REQUEST:
111 debug("Got ICMP ECHO REQUEST, return "
112 "%d bytes\n", ETHER_HDR_SIZE + len);
114 memcpy(&et->et_dest[0], &et->et_src[0], 6);
115 memcpy(&et->et_src[0], NetOurEther, 6);
119 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src);
120 NetCopyIP((void *)&ip->ip_src, &NetOurIP);
121 ip->ip_sum = ~NetCksum((uchar *)ip,
124 icmph->type = ICMP_ECHO_REPLY;
126 icmph->checksum = ~NetCksum((uchar *)icmph,
127 (len - IP_HDR_SIZE) >> 1);
128 (void) eth_send((uchar *)et,
129 ETHER_HDR_SIZE + len);