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 * SPDX-License-Identifier: GPL-2.0 10 */ 11 12 #include "ping.h" 13 #include "arp.h" 14 15 static ushort ping_seq_number; 16 17 /* The ip address to ping */ 18 struct in_addr net_ping_ip; 19 20 static void set_icmp_header(uchar *pkt, struct in_addr dest) 21 { 22 /* 23 * Construct an IP and ICMP header. 24 */ 25 struct ip_hdr *ip = (struct ip_hdr *)pkt; 26 struct icmp_hdr *icmp = (struct icmp_hdr *)(pkt + IP_HDR_SIZE); 27 28 net_set_ip_header(pkt, dest, net_ip); 29 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); 33 34 icmp->type = ICMP_ECHO_REQUEST; 35 icmp->code = 0; 36 icmp->checksum = 0; 37 icmp->un.echo.id = 0; 38 icmp->un.echo.sequence = htons(ping_seq_number++); 39 icmp->checksum = compute_ip_checksum(icmp, ICMP_HDR_SIZE); 40 } 41 42 static int ping_send(void) 43 { 44 uchar *pkt; 45 int eth_hdr_size; 46 47 /* XXX always send arp request */ 48 49 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &net_ping_ip); 50 51 net_arp_wait_packet_ip = net_ping_ip; 52 53 eth_hdr_size = net_set_ether(net_tx_packet, net_null_ethaddr, PROT_IP); 54 pkt = (uchar *)net_tx_packet + eth_hdr_size; 55 56 set_icmp_header(pkt, net_ping_ip); 57 58 /* size of the waiting packet */ 59 arp_wait_tx_packet_size = eth_hdr_size + IP_ICMP_HDR_SIZE; 60 61 /* and do the ARP request */ 62 arp_wait_try = 1; 63 arp_wait_timer_start = get_timer(0); 64 arp_request(); 65 return 1; /* waiting */ 66 } 67 68 static void ping_timeout_handler(void) 69 { 70 eth_halt(); 71 net_set_state(NETLOOP_FAIL); /* we did not get the reply */ 72 } 73 74 void ping_start(void) 75 { 76 printf("Using %s device\n", eth_get_name()); 77 net_set_timeout_handler(10000UL, ping_timeout_handler); 78 79 ping_send(); 80 } 81 82 void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len) 83 { 84 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src; 85 struct in_addr src_ip; 86 int eth_hdr_size; 87 88 switch (icmph->type) { 89 case ICMP_ECHO_REPLY: 90 src_ip = net_read_ip((void *)&ip->ip_src); 91 if (src_ip.s_addr == net_ping_ip.s_addr) 92 net_set_state(NETLOOP_SUCCESS); 93 return; 94 case ICMP_ECHO_REQUEST: 95 eth_hdr_size = net_update_ether(et, et->et_src, PROT_IP); 96 97 debug_cond(DEBUG_DEV_PKT, 98 "Got ICMP ECHO REQUEST, return %d bytes\n", 99 eth_hdr_size + len); 100 101 ip->ip_sum = 0; 102 ip->ip_off = 0; 103 net_copy_ip((void *)&ip->ip_dst, &ip->ip_src); 104 net_copy_ip((void *)&ip->ip_src, &net_ip); 105 ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE); 106 107 icmph->type = ICMP_ECHO_REPLY; 108 icmph->checksum = 0; 109 icmph->checksum = compute_ip_checksum(icmph, len - IP_HDR_SIZE); 110 net_send_packet((uchar *)et, eth_hdr_size + len); 111 return; 112 /* default: 113 return;*/ 114 } 115 } 116