114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copied from Linux Monitor (LiMon) - Networking.
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*
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* Copyright 1994 - 2000 Neil Russell.
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* (See License)
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* Copyright 2000 Roland Borde
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* Copyright 2000 Paolo Scaffardi
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* Copyright 2000-2002 Wolfgang Denk, wd@denx.de
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*/
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#include "ping.h"
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#include "arp.h"
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static ushort ping_seq_number;
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/* The ip address to ping */
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struct in_addr net_ping_ip;
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static void set_icmp_header(uchar *pkt, struct in_addr dest)
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{
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/*
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* Construct an IP and ICMP header.
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*/
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struct icmp_hdr *icmp = (struct icmp_hdr *)(pkt + IP_HDR_SIZE);
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net_set_ip_header(pkt, dest, net_ip, IP_ICMP_HDR_SIZE, IPPROTO_ICMP);
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icmp->type = ICMP_ECHO_REQUEST;
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icmp->code = 0;
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icmp->checksum = 0;
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icmp->un.echo.id = 0;
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icmp->un.echo.sequence = htons(ping_seq_number++);
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icmp->checksum = compute_ip_checksum(icmp, ICMP_HDR_SIZE);
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}
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static int ping_send(void)
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{
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uchar *pkt;
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int eth_hdr_size;
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/* XXX always send arp request */
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debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &net_ping_ip);
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net_arp_wait_packet_ip = net_ping_ip;
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eth_hdr_size = net_set_ether(net_tx_packet, net_null_ethaddr, PROT_IP);
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pkt = (uchar *)net_tx_packet + eth_hdr_size;
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set_icmp_header(pkt, net_ping_ip);
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/* size of the waiting packet */
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arp_wait_tx_packet_size = eth_hdr_size + IP_ICMP_HDR_SIZE;
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/* and do the ARP request */
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arp_wait_try = 1;
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arp_wait_timer_start = get_timer(0);
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arp_request();
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return 1; /* waiting */
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}
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static void ping_timeout_handler(void)
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{
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eth_halt();
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net_set_state(NETLOOP_FAIL); /* we did not get the reply */
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}
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void ping_start(void)
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{
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printf("Using %s device\n", eth_get_name());
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net_set_timeout_handler(10000UL, ping_timeout_handler);
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ping_send();
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}
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void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
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{
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struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
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struct in_addr src_ip;
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int eth_hdr_size;
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uchar *tx_packet;
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switch (icmph->type) {
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case ICMP_ECHO_REPLY:
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src_ip = net_read_ip((void *)&ip->ip_src);
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if (src_ip.s_addr == net_ping_ip.s_addr)
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net_set_state(NETLOOP_SUCCESS);
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return;
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case ICMP_ECHO_REQUEST:
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eth_hdr_size = net_update_ether(et, et->et_src, PROT_IP);
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debug_cond(DEBUG_DEV_PKT,
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"Got ICMP ECHO REQUEST, return %d bytes\n",
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eth_hdr_size + len);
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ip->ip_sum = 0;
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ip->ip_off = 0;
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net_copy_ip((void *)&ip->ip_dst, &ip->ip_src);
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net_copy_ip((void *)&ip->ip_src, &net_ip);
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ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
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icmph->type = ICMP_ECHO_REPLY;
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icmph->checksum = 0;
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icmph->checksum = compute_ip_checksum(icmph, len - IP_HDR_SIZE);
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tx_packet = net_get_async_tx_pkt_buf();
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memcpy(tx_packet, et, eth_hdr_size + len);
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net_send_packet(tx_packet, eth_hdr_size + len);
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return;
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/* default:
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return;*/
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}
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}
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