LXR uboot/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
  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 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
  37static 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
  63static void ping_timeout_handler(void)
  64{
  65        eth_halt();
  66        net_set_state(NETLOOP_FAIL);    /* we did not get the reply */
  67}
  68
  69void 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
  77void 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