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
15 static ushort ping_seq_number;
16
17 /* The ip address to ping */
18 struct in_addr net_ping_ip;
19
set_icmp_header(uchar * pkt,struct in_addr dest)20 static 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
ping_send(void)37 static 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
ping_timeout_handler(void)63 static void ping_timeout_handler(void)
64 {
65 eth_halt();
66 net_set_state(NETLOOP_FAIL); /* we did not get the reply */
67 }
68
ping_start(void)69 void 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
ping_receive(struct ethernet_hdr * et,struct ip_udp_hdr * ip,int len)77 void 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