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net - Support ping reply when processing net-loop 

Add ICMP_ECHO_REQUEST packet support by responding with a ICMP_ECHO_REPLY.

This permits the ping command to test the phy interface when the phy
is put in loopback mode (typically by setting register 0 bit 14).

It also allows the port to respond to an external ping when u-boot is
processing some other net command (such as tftp).  This is useful when
tftp appears to hang.

Signed-off-by: Ed Swarthout <Ed.Swarthout@freescale.com>
Signed-off-by: Ben Warren <bwarren@qstreams.com>
This commit is contained in:
Ed Swarthout 2007-03-07 12:14:50 -06:00 committed by Ben Warren
parent ccbc703664
commit 83853178bd
1 changed files with 20 additions and 0 deletions
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20
net/net.c
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@ -1424,6 +1424,26 @@ NetReceive(volatile uchar * inpkt, int len)
/* XXX point to ip packet */
(*packetHandler)((uchar *)ip, 0, 0, 0);
return;
case ICMP_ECHO_REQUEST:
#ifdef ET_DEBUG
printf ("Got ICMP ECHO REQUEST, return %d bytes \n",
ETHER_HDR_SIZE + len);
#endif
memcpy (&et->et_dest[0], &et->et_src[0], 6);
memcpy (&et->et_src[ 0], NetOurEther, 6);
ip->ip_sum = 0;
ip->ip_off = 0;
NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
NetCopyIP((void*)&ip->ip_src, &NetOurIP);
ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1);
icmph->type = ICMP_ECHO_REPLY;
icmph->checksum = 0;
icmph->checksum = ~NetCksum((uchar *)icmph,
(len - IP_HDR_SIZE_NO_UDP) >> 1);
(void) eth_send((uchar *)et, ETHER_HDR_SIZE + len);
return;
#endif
default:
return;