LXR uboot/net/ping.c

   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
  15static ushort ping_seq_number;
  16
  17/* The ip address to ping */
  18struct in_addr net_ping_ip;
  19
  20static 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
  42static 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
  68static void ping_timeout_handler(void)
  69{
  70        eth_halt();
  71        net_set_state(NETLOOP_FAIL);    /* we did not get the reply */
  72}
  73
  74void 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
  82void 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