1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copied from Linux Monitor (LiMon) - Networking. 4 * 5 * Copyright 1994 - 2000 Neil Russell. 6 * (See License) 7 * Copyright 2000 Roland Borde 8 * Copyright 2000 Paolo Scaffardi 9 * Copyright 2000-2002 Wolfgang Denk, wd@denx.de 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 icmp_hdr *icmp = (struct icmp_hdr *)(pkt + IP_HDR_SIZE); 26 27 net_set_ip_header(pkt, dest, net_ip, IP_ICMP_HDR_SIZE, IPPROTO_ICMP); 28 29 icmp->type = ICMP_ECHO_REQUEST; 30 icmp->code = 0; 31 icmp->checksum = 0; 32 icmp->un.echo.id = 0; 33 icmp->un.echo.sequence = htons(ping_seq_number++); 34 icmp->checksum = compute_ip_checksum(icmp, ICMP_HDR_SIZE); 35 } 36 37 static int ping_send(void) 38 { 39 uchar *pkt; 40 int eth_hdr_size; 41 42 /* XXX always send arp request */ 43 44 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &net_ping_ip); 45 46 net_arp_wait_packet_ip = net_ping_ip; 47 48 eth_hdr_size = net_set_ether(net_tx_packet, net_null_ethaddr, PROT_IP); 49 pkt = (uchar *)net_tx_packet + eth_hdr_size; 50 51 set_icmp_header(pkt, net_ping_ip); 52 53 /* size of the waiting packet */ 54 arp_wait_tx_packet_size = eth_hdr_size + IP_ICMP_HDR_SIZE; 55 56 /* and do the ARP request */ 57 arp_wait_try = 1; 58 arp_wait_timer_start = get_timer(0); 59 arp_request(); 60 return 1; /* waiting */ 61 } 62 63 static void ping_timeout_handler(void) 64 { 65 eth_halt(); 66 net_set_state(NETLOOP_FAIL); /* we did not get the reply */ 67 } 68 69 void ping_start(void) 70 { 71 printf("Using %s device\n", eth_get_name()); 72 net_set_timeout_handler(10000UL, ping_timeout_handler); 73 74 ping_send(); 75 } 76 77 void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len) 78 { 79 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src; 80 struct in_addr src_ip; 81 int eth_hdr_size; 82 uchar *tx_packet; 83 84 switch (icmph->type) { 85 case ICMP_ECHO_REPLY: 86 src_ip = net_read_ip((void *)&ip->ip_src); 87 if (src_ip.s_addr == net_ping_ip.s_addr) 88 net_set_state(NETLOOP_SUCCESS); 89 return; 90 case ICMP_ECHO_REQUEST: 91 eth_hdr_size = net_update_ether(et, et->et_src, PROT_IP); 92 93 debug_cond(DEBUG_DEV_PKT, 94 "Got ICMP ECHO REQUEST, return %d bytes\n", 95 eth_hdr_size + len); 96 97 ip->ip_sum = 0; 98 ip->ip_off = 0; 99 net_copy_ip((void *)&ip->ip_dst, &ip->ip_src); 100 net_copy_ip((void *)&ip->ip_src, &net_ip); 101 ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE); 102 103 icmph->type = ICMP_ECHO_REPLY; 104 icmph->checksum = 0; 105 icmph->checksum = compute_ip_checksum(icmph, len - IP_HDR_SIZE); 106 107 tx_packet = net_get_async_tx_pkt_buf(); 108 memcpy(tx_packet, et, eth_hdr_size + len); 109 net_send_packet(tx_packet, eth_hdr_size + len); 110 return; 111 /* default: 112 return;*/ 113 } 114 } 115