HelenOS sources

ICMPV6_ECHO_REQUEST  144 uspace/srv/net/inetsrv/icmpv6.c 	case ICMPV6_ECHO_REQUEST:
ICMPV6_ECHO_REQUEST  168 uspace/srv/net/inetsrv/icmpv6.c 	request->type = ICMPV6_ECHO_REQUEST;
HelenOS homepage, sources at GitHub