net/ping.c

   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 #include <log.h>
  15 #include <net.h>
  16
  17 static ushort ping_seq_number;
  18
  19 /* The ip address to ping */
  20 struct in_addr net_ping_ip;
  21
  22 static void set_icmp_header(uchar *pkt, struct in_addr dest)
  23 {
  24         /*
  25          *      Construct an IP and ICMP header.
  26          */
  27         struct icmp_hdr *icmp = (struct icmp_hdr *)(pkt + IP_HDR_SIZE);
  28
  29         net_set_ip_header(pkt, dest, net_ip, IP_ICMP_HDR_SIZE, IPPROTO_ICMP);
  30
  31         icmp->type = ICMP_ECHO_REQUEST;
  32         icmp->code = 0;
  33         icmp->checksum = 0;
  34         icmp->un.echo.id = 0;
  35         icmp->un.echo.sequence = htons(ping_seq_number++);
  36         icmp->checksum = compute_ip_checksum(icmp, ICMP_HDR_SIZE);
  37 }
  38
  39 static int ping_send(void)
  40 {
  41         uchar *pkt;
  42         int eth_hdr_size;
  43
  44         /* XXX always send arp request */
  45
  46         debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &net_ping_ip);
  47
  48         net_arp_wait_packet_ip = net_ping_ip;
  49
  50         eth_hdr_size = net_set_ether(net_tx_packet, net_null_ethaddr, PROT_IP);
  51         pkt = (uchar *)net_tx_packet + eth_hdr_size;
  52
  53         set_icmp_header(pkt, net_ping_ip);
  54
  55         /* size of the waiting packet */
  56         arp_wait_tx_packet_size = eth_hdr_size + IP_ICMP_HDR_SIZE;
  57
  58         /* and do the ARP request */
  59         arp_wait_try = 1;
  60         arp_wait_timer_start = get_timer(0);
  61         arp_request();
  62         return 1;       /* waiting */
  63 }
  64
  65 static void ping_timeout_handler(void)
  66 {
  67         eth_halt();
  68         net_set_state(NETLOOP_FAIL);    /* we did not get the reply */
  69 }
  70
  71 void ping_start(void)
  72 {
  73         printf("Using %s device\n", eth_get_name());
  74         net_set_timeout_handler(10000UL, ping_timeout_handler);
  75
  76         ping_send();
  77 }
  78
  79 void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
  80 {
  81         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
  82         struct in_addr src_ip;
  83         int eth_hdr_size;
  84         uchar *tx_packet;
  85
  86         switch (icmph->type) {
  87         case ICMP_ECHO_REPLY:
  88                 src_ip = net_read_ip((void *)&ip->ip_src);
  89                 if (src_ip.s_addr == net_ping_ip.s_addr)
  90                         net_set_state(NETLOOP_SUCCESS);
  91                 return;
  92         case ICMP_ECHO_REQUEST:
  93                 eth_hdr_size = net_update_ether(et, et->et_src, PROT_IP);
  94
  95                 debug_cond(DEBUG_DEV_PKT,
  96                            "Got ICMP ECHO REQUEST, return %d bytes\n",
  97                            eth_hdr_size + len);
  98
  99                 ip->ip_sum = 0;
 100                 ip->ip_off = 0;
 101                 net_copy_ip((void *)&ip->ip_dst, &ip->ip_src);
 102                 net_copy_ip((void *)&ip->ip_src, &net_ip);
 103                 ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
 104
 105                 icmph->type = ICMP_ECHO_REPLY;
 106                 icmph->checksum = 0;
 107                 icmph->checksum = compute_ip_checksum(icmph, len - IP_HDR_SIZE);
 108
 109                 tx_packet = net_get_async_tx_pkt_buf();
 110                 memcpy(tx_packet, et, eth_hdr_size + len);
 111                 net_send_packet(tx_packet, eth_hdr_size + len);
 112                 return;
 113 /*      default:
 114                 return;*/
 115         }
 116 }