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Add several levels of DEBUG prints so that you can limit the noise to the severety of your problem. DEBUG_LL_STATE = Link local state machine changes DEBUG_DEV_PKT = Packets or info directed to the device DEBUG_NET_PKT = Packets on info on the network at large DEBUG_INT_STATE = Internal network state changes Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/*
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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 PingSeqNo;
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/* The ip address to ping */
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IPaddr_t NetPingIP;
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static void set_icmp_header(uchar *pkt, IPaddr_t 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 ip_hdr *ip = (struct ip_hdr *)pkt;
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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, NetOurIP);
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ip->ip_len = htons(IP_ICMP_HDR_SIZE);
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ip->ip_p = IPPROTO_ICMP;
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ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE >> 1);
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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(PingSeqNo++);
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icmp->checksum = ~NetCksum((uchar *)icmp, ICMP_HDR_SIZE >> 1);
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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", &NetPingIP);
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NetArpWaitPacketIP = NetPingIP;
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eth_hdr_size = NetSetEther(NetTxPacket, NetEtherNullAddr, PROT_IP);
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pkt = (uchar *)NetTxPacket + eth_hdr_size;
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set_icmp_header(pkt, NetPingIP);
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/* size of the waiting packet */
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NetArpWaitTxPacketSize = eth_hdr_size + IP_ICMP_HDR_SIZE;
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/* and do the ARP request */
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NetArpWaitTry = 1;
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NetArpWaitTimerStart = get_timer(0);
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ArpRequest();
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return 1; /* waiting */
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}
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static void ping_timeout(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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NetSetTimeout(10000UL, ping_timeout);
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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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IPaddr_t src_ip;
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int eth_hdr_size;
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switch (icmph->type) {
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case ICMP_ECHO_REPLY:
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src_ip = NetReadIP((void *)&ip->ip_src);
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if (src_ip == NetPingIP)
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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, "Got ICMP ECHO REQUEST, return "
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"%d bytes\n", eth_hdr_size + len);
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ip->ip_sum = 0;
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ip->ip_off = 0;
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NetCopyIP((void *)&ip->ip_dst, &ip->ip_src);
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NetCopyIP((void *)&ip->ip_src, &NetOurIP);
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ip->ip_sum = ~NetCksum((uchar *)ip,
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IP_HDR_SIZE >> 1);
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icmph->type = ICMP_ECHO_REPLY;
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icmph->checksum = 0;
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icmph->checksum = ~NetCksum((uchar *)icmph,
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(len - IP_HDR_SIZE) >> 1);
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NetSendPacket((uchar *)et, 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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