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 uchar *pkt; 44 int eth_hdr_size; 45 46 /* XXX always send arp request */ 47 48 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &NetPingIP); 49 50 NetArpWaitPacketIP = NetPingIP; 51 52 eth_hdr_size = NetSetEther(NetTxPacket, NetEtherNullAddr, PROT_IP); 53 pkt = (uchar *)NetTxPacket + eth_hdr_size; 54 55 set_icmp_header(pkt, NetPingIP); 56 57 /* size of the waiting packet */ 58 NetArpWaitTxPacketSize = eth_hdr_size + IP_ICMP_HDR_SIZE; 59 60 /* and do the ARP request */ 61 NetArpWaitTry = 1; 62 NetArpWaitTimerStart = get_timer(0); 63 ArpRequest(); 64 return 1; /* waiting */ 65 } 66 67 static void ping_timeout(void) 68 { 69 eth_halt(); 70 net_set_state(NETLOOP_FAIL); /* we did not get the reply */ 71 } 72 73 void ping_start(void) 74 { 75 printf("Using %s device\n", eth_get_name()); 76 NetSetTimeout(10000UL, ping_timeout); 77 78 ping_send(); 79 } 80 81 void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len) 82 { 83 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src; 84 IPaddr_t src_ip; 85 int eth_hdr_size; 86 87 switch (icmph->type) { 88 case ICMP_ECHO_REPLY: 89 src_ip = NetReadIP((void *)&ip->ip_src); 90 if (src_ip == NetPingIP) 91 net_set_state(NETLOOP_SUCCESS); 92 return; 93 case ICMP_ECHO_REQUEST: 94 eth_hdr_size = net_update_ether(et, et->et_src, PROT_IP); 95 96 debug_cond(DEBUG_DEV_PKT, "Got ICMP ECHO REQUEST, return " 97 "%d bytes\n", eth_hdr_size + len); 98 99 ip->ip_sum = 0; 100 ip->ip_off = 0; 101 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src); 102 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 103 ip->ip_sum = ~NetCksum((uchar *)ip, 104 IP_HDR_SIZE >> 1); 105 106 icmph->type = ICMP_ECHO_REPLY; 107 icmph->checksum = 0; 108 icmph->checksum = ~NetCksum((uchar *)icmph, 109 (len - IP_HDR_SIZE) >> 1); 110 NetSendPacket((uchar *)et, eth_hdr_size + len); 111 return; 112 /* default: 113 return;*/ 114 } 115 } 116