// SPDX-License-Identifier: GPL-2.0

  /*
   *	Copied from Linux Monitor (LiMon) - Networking.
   *
   *	Copyright 1994 - 2000 Neil Russell.
   *	(See License)
   *	Copyright 2000 Roland Borde
   *	Copyright 2000 Paolo Scaffardi
   *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de
   */
  
  #include "ping.h"
  #include "arp.h"

  static ushort ping_seq_number;

  
  /* The ip address to ping */

  struct in_addr net_ping_ip;

  static void set_icmp_header(uchar *pkt, struct in_addr dest)

  {
  	/*
  	 *	Construct an IP and ICMP header.
  	 */

  	struct icmp_hdr *icmp = (struct icmp_hdr *)(pkt + IP_HDR_SIZE);

  	net_set_ip_header(pkt, dest, net_ip, IP_ICMP_HDR_SIZE, IPPROTO_ICMP);

  
  	icmp->type = ICMP_ECHO_REQUEST;
  	icmp->code = 0;
  	icmp->checksum = 0;
  	icmp->un.echo.id = 0;

  	icmp->un.echo.sequence = htons(ping_seq_number++);

  	icmp->checksum = compute_ip_checksum(icmp, ICMP_HDR_SIZE);

  }

  static int ping_send(void)
  {

  	uchar *pkt;

  	int eth_hdr_size;

  
  	/* XXX always send arp request */

  	debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4
  ", &net_ping_ip);

  	net_arp_wait_packet_ip = net_ping_ip;

  	eth_hdr_size = net_set_ether(net_tx_packet, net_null_ethaddr, PROT_IP);
  	pkt = (uchar *)net_tx_packet + eth_hdr_size;

  	set_icmp_header(pkt, net_ping_ip);

  
  	/* size of the waiting packet */

  	arp_wait_tx_packet_size = eth_hdr_size + IP_ICMP_HDR_SIZE;

  
  	/* and do the ARP request */

  	arp_wait_try = 1;
  	arp_wait_timer_start = get_timer(0);
  	arp_request();

  	return 1;	/* waiting */
  }

  static void ping_timeout_handler(void)

  {
  	eth_halt();

  	net_set_state(NETLOOP_FAIL);	/* we did not get the reply */

  }

  void ping_start(void)
  {
  	printf("Using %s device
  ", eth_get_name());

  	net_set_timeout_handler(10000UL, ping_timeout_handler);

  
  	ping_send();
  }

  void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)

  {

  	struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;

  	struct in_addr src_ip;

  	int eth_hdr_size;

  	uchar *tx_packet;

  
  	switch (icmph->type) {
  	case ICMP_ECHO_REPLY:

  		src_ip = net_read_ip((void *)&ip->ip_src);
  		if (src_ip.s_addr == net_ping_ip.s_addr)

  			net_set_state(NETLOOP_SUCCESS);

  		return;
  	case ICMP_ECHO_REQUEST:

  		eth_hdr_size = net_update_ether(et, et->et_src, PROT_IP);

  		debug_cond(DEBUG_DEV_PKT,
  			   "Got ICMP ECHO REQUEST, return %d bytes
  ",
  			   eth_hdr_size + len);

  
  		ip->ip_sum = 0;
  		ip->ip_off = 0;

  		net_copy_ip((void *)&ip->ip_dst, &ip->ip_src);
  		net_copy_ip((void *)&ip->ip_src, &net_ip);

  		ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);

  
  		icmph->type = ICMP_ECHO_REPLY;
  		icmph->checksum = 0;

  		icmph->checksum = compute_ip_checksum(icmph, len - IP_HDR_SIZE);

  
  		tx_packet = net_get_async_tx_pkt_buf();
  		memcpy(tx_packet, et, eth_hdr_size + len);
  		net_send_packet(tx_packet, eth_hdr_size + len);

  		return;
  /*	default:
  		return;*/
  	}
  }