1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copied from Linux Monitor (LiMon) - Networking.
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright 1994 - 2000 Neil Russell.
5*4882a593Smuzhiyun * (See License)
6*4882a593Smuzhiyun * Copyright 2000 Roland Borde
7*4882a593Smuzhiyun * Copyright 2000 Paolo Scaffardi
8*4882a593Smuzhiyun * Copyright 2000-2002 Wolfgang Denk, wd@denx.de
9*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include "ping.h"
13*4882a593Smuzhiyun #include "arp.h"
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun static ushort ping_seq_number;
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun /* The ip address to ping */
18*4882a593Smuzhiyun struct in_addr net_ping_ip;
19*4882a593Smuzhiyun
set_icmp_header(uchar * pkt,struct in_addr dest)20*4882a593Smuzhiyun static void set_icmp_header(uchar *pkt, struct in_addr dest)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun /*
23*4882a593Smuzhiyun * Construct an IP and ICMP header.
24*4882a593Smuzhiyun */
25*4882a593Smuzhiyun struct ip_hdr *ip = (struct ip_hdr *)pkt;
26*4882a593Smuzhiyun struct icmp_hdr *icmp = (struct icmp_hdr *)(pkt + IP_HDR_SIZE);
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun net_set_ip_header(pkt, dest, net_ip);
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun ip->ip_len = htons(IP_ICMP_HDR_SIZE);
31*4882a593Smuzhiyun ip->ip_p = IPPROTO_ICMP;
32*4882a593Smuzhiyun ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun icmp->type = ICMP_ECHO_REQUEST;
35*4882a593Smuzhiyun icmp->code = 0;
36*4882a593Smuzhiyun icmp->checksum = 0;
37*4882a593Smuzhiyun icmp->un.echo.id = 0;
38*4882a593Smuzhiyun icmp->un.echo.sequence = htons(ping_seq_number++);
39*4882a593Smuzhiyun icmp->checksum = compute_ip_checksum(icmp, ICMP_HDR_SIZE);
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
ping_send(void)42*4882a593Smuzhiyun static int ping_send(void)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun uchar *pkt;
45*4882a593Smuzhiyun int eth_hdr_size;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun /* XXX always send arp request */
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &net_ping_ip);
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun net_arp_wait_packet_ip = net_ping_ip;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun eth_hdr_size = net_set_ether(net_tx_packet, net_null_ethaddr, PROT_IP);
54*4882a593Smuzhiyun pkt = (uchar *)net_tx_packet + eth_hdr_size;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun set_icmp_header(pkt, net_ping_ip);
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun /* size of the waiting packet */
59*4882a593Smuzhiyun arp_wait_tx_packet_size = eth_hdr_size + IP_ICMP_HDR_SIZE;
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun /* and do the ARP request */
62*4882a593Smuzhiyun arp_wait_try = 1;
63*4882a593Smuzhiyun arp_wait_timer_start = get_timer(0);
64*4882a593Smuzhiyun arp_request();
65*4882a593Smuzhiyun return 1; /* waiting */
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
ping_timeout_handler(void)68*4882a593Smuzhiyun static void ping_timeout_handler(void)
69*4882a593Smuzhiyun {
70*4882a593Smuzhiyun eth_halt();
71*4882a593Smuzhiyun net_set_state(NETLOOP_FAIL); /* we did not get the reply */
72*4882a593Smuzhiyun }
73*4882a593Smuzhiyun
ping_start(void)74*4882a593Smuzhiyun void ping_start(void)
75*4882a593Smuzhiyun {
76*4882a593Smuzhiyun printf("Using %s device\n", eth_get_name());
77*4882a593Smuzhiyun net_set_timeout_handler(10000UL, ping_timeout_handler);
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun ping_send();
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun
ping_receive(struct ethernet_hdr * et,struct ip_udp_hdr * ip,int len)82*4882a593Smuzhiyun void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
83*4882a593Smuzhiyun {
84*4882a593Smuzhiyun struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
85*4882a593Smuzhiyun struct in_addr src_ip;
86*4882a593Smuzhiyun int eth_hdr_size;
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun switch (icmph->type) {
89*4882a593Smuzhiyun case ICMP_ECHO_REPLY:
90*4882a593Smuzhiyun src_ip = net_read_ip((void *)&ip->ip_src);
91*4882a593Smuzhiyun if (src_ip.s_addr == net_ping_ip.s_addr)
92*4882a593Smuzhiyun net_set_state(NETLOOP_SUCCESS);
93*4882a593Smuzhiyun return;
94*4882a593Smuzhiyun case ICMP_ECHO_REQUEST:
95*4882a593Smuzhiyun eth_hdr_size = net_update_ether(et, et->et_src, PROT_IP);
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun debug_cond(DEBUG_DEV_PKT,
98*4882a593Smuzhiyun "Got ICMP ECHO REQUEST, return %d bytes\n",
99*4882a593Smuzhiyun eth_hdr_size + len);
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun ip->ip_sum = 0;
102*4882a593Smuzhiyun ip->ip_off = 0;
103*4882a593Smuzhiyun net_copy_ip((void *)&ip->ip_dst, &ip->ip_src);
104*4882a593Smuzhiyun net_copy_ip((void *)&ip->ip_src, &net_ip);
105*4882a593Smuzhiyun ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun icmph->type = ICMP_ECHO_REPLY;
108*4882a593Smuzhiyun icmph->checksum = 0;
109*4882a593Smuzhiyun icmph->checksum = compute_ip_checksum(icmph, len - IP_HDR_SIZE);
110*4882a593Smuzhiyun net_send_packet((uchar *)et, eth_hdr_size + len);
111*4882a593Smuzhiyun return;
112*4882a593Smuzhiyun /* default:
113*4882a593Smuzhiyun return;*/
114*4882a593Smuzhiyun }
115*4882a593Smuzhiyun }
116