1 /* 2 * Copied from Linux Monitor (LiMon) - Networking. 3 * 4 * Copyright 1994 - 2000 Neil Russell. 5 * (See License) 6 * Copyright 2000 Roland Borde 7 * Copyright 2000 Paolo Scaffardi 8 * Copyright 2000-2002 Wolfgang Denk, wd@denx.de 9 */ 10 11 #include "ping.h" 12 #include "arp.h" 13 14 static ushort PingSeqNo; 15 16 /* The ip address to ping */ 17 IPaddr_t NetPingIP; 18 19 static void set_icmp_header(uchar *pkt, IPaddr_t dest) 20 { 21 /* 22 * Construct an IP and ICMP header. 23 */ 24 struct ip_hdr *ip = (struct ip_hdr *)pkt; 25 struct icmp_hdr *icmp = (struct icmp_hdr *)(pkt + IP_HDR_SIZE); 26 27 net_set_ip_header(pkt, dest, NetOurIP); 28 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); 32 33 icmp->type = ICMP_ECHO_REQUEST; 34 icmp->code = 0; 35 icmp->checksum = 0; 36 icmp->un.echo.id = 0; 37 icmp->un.echo.sequence = htons(PingSeqNo++); 38 icmp->checksum = ~NetCksum((uchar *)icmp, ICMP_HDR_SIZE >> 1); 39 } 40 41 static int ping_send(void) 42 { 43 static uchar mac[6]; 44 uchar *pkt; 45 int eth_hdr_size; 46 47 /* XXX always send arp request */ 48 49 memcpy(mac, NetEtherNullAddr, 6); 50 51 debug("sending ARP for %pI4\n", &NetPingIP); 52 53 NetArpWaitPacketIP = NetPingIP; 54 NetArpWaitPacketMAC = mac; 55 56 pkt = NetArpWaitTxPacket; 57 eth_hdr_size = NetSetEther(pkt, mac, PROT_IP); 58 pkt += eth_hdr_size; 59 60 set_icmp_header(pkt, NetPingIP); 61 62 /* size of the waiting packet */ 63 NetArpWaitTxPacketSize = eth_hdr_size + IP_ICMP_HDR_SIZE; 64 65 /* and do the ARP request */ 66 NetArpWaitTry = 1; 67 NetArpWaitTimerStart = get_timer(0); 68 ArpRequest(); 69 return 1; /* waiting */ 70 } 71 72 static void ping_timeout(void) 73 { 74 eth_halt(); 75 net_set_state(NETLOOP_FAIL); /* we did not get the reply */ 76 } 77 78 void ping_start(void) 79 { 80 printf("Using %s device\n", eth_get_name()); 81 NetSetTimeout(10000UL, ping_timeout); 82 83 ping_send(); 84 } 85 86 void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len) 87 { 88 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src; 89 IPaddr_t src_ip; 90 91 switch (icmph->type) { 92 case ICMP_ECHO_REPLY: 93 src_ip = NetReadIP((void *)&ip->ip_src); 94 if (src_ip == NetPingIP) 95 net_set_state(NETLOOP_SUCCESS); 96 return; 97 case ICMP_ECHO_REQUEST: 98 debug("Got ICMP ECHO REQUEST, return " 99 "%d bytes\n", ETHER_HDR_SIZE + len); 100 101 memcpy(&et->et_dest[0], &et->et_src[0], 6); 102 memcpy(&et->et_src[0], NetOurEther, 6); 103 104 ip->ip_sum = 0; 105 ip->ip_off = 0; 106 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src); 107 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 108 ip->ip_sum = ~NetCksum((uchar *)ip, 109 IP_HDR_SIZE >> 1); 110 111 icmph->type = ICMP_ECHO_REPLY; 112 icmph->checksum = 0; 113 icmph->checksum = ~NetCksum((uchar *)icmph, 114 (len - IP_HDR_SIZE) >> 1); 115 NetSendPacket((uchar *)et, ETHER_HDR_SIZE + len); 116 return; 117 /* default: 118 return;*/ 119 } 120 } 121