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 46 /* XXX always send arp request */ 47 48 memcpy(mac, NetEtherNullAddr, 6); 49 50 debug("sending ARP for %pI4\n", &NetPingIP); 51 52 NetArpWaitPacketIP = NetPingIP; 53 NetArpWaitPacketMAC = mac; 54 55 pkt = NetArpWaitTxPacket; 56 pkt += NetSetEther(pkt, mac, PROT_IP); 57 58 set_icmp_header(pkt, NetPingIP); 59 60 /* size of the waiting packet */ 61 NetArpWaitTxPacketSize = 62 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + 8; 63 64 /* and do the ARP request */ 65 NetArpWaitTry = 1; 66 NetArpWaitTimerStart = get_timer(0); 67 ArpRequest(); 68 return 1; /* waiting */ 69 } 70 71 static void ping_timeout(void) 72 { 73 eth_halt(); 74 NetState = NETLOOP_FAIL; /* we did not get the reply */ 75 } 76 77 static void ping_handler(uchar *pkt, unsigned dest, IPaddr_t sip, 78 unsigned src, unsigned len) 79 { 80 if (sip != NetPingIP) 81 return; 82 83 NetState = NETLOOP_SUCCESS; 84 } 85 86 void ping_start(void) 87 { 88 printf("Using %s device\n", eth_get_name()); 89 NetSetTimeout(10000UL, ping_timeout); 90 NetSetHandler(ping_handler); 91 92 ping_send(); 93 } 94 95 void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len) 96 { 97 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src; 98 IPaddr_t src_ip; 99 100 switch (icmph->type) { 101 case ICMP_ECHO_REPLY: 102 /* 103 * IP header OK. Pass the packet to the 104 * current handler. 105 */ 106 /* XXX point to ip packet */ 107 src_ip = NetReadIP((void *)&ip->ip_src); 108 NetGetHandler()((uchar *)ip, 0, src_ip, 0, 0); 109 return; 110 case ICMP_ECHO_REQUEST: 111 debug("Got ICMP ECHO REQUEST, return " 112 "%d bytes\n", ETHER_HDR_SIZE + len); 113 114 memcpy(&et->et_dest[0], &et->et_src[0], 6); 115 memcpy(&et->et_src[0], NetOurEther, 6); 116 117 ip->ip_sum = 0; 118 ip->ip_off = 0; 119 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src); 120 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 121 ip->ip_sum = ~NetCksum((uchar *)ip, 122 IP_HDR_SIZE >> 1); 123 124 icmph->type = ICMP_ECHO_REPLY; 125 icmph->checksum = 0; 126 icmph->checksum = ~NetCksum((uchar *)icmph, 127 (len - IP_HDR_SIZE) >> 1); 128 (void) eth_send((uchar *)et, 129 ETHER_HDR_SIZE + len); 130 return; 131 /* default: 132 return;*/ 133 } 134 } 135