RA_OPT_NEXT_HDR
if ((char *)RA_OPT_NEXT_HDR(raoptp) > (char *)icp + msglen) {
while ((char *)addr < (char *)RA_OPT_NEXT_HDR(raoptp)) {
p = (char *)RA_OPT_NEXT_HDR(raoptp);
raoptp = (char *)RA_OPT_NEXT_HDR(raoptp);