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-rw-r--r--net/net.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/net/net.c b/net/net.c
index 1d1c98f..2ff7bfc 100644
--- a/net/net.c
+++ b/net/net.c
@@ -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;