RSRR_HEADER_LEN
if (recvlen < RSRR_HEADER_LEN) {
route_query = (struct rsrr_rq *) (rsrr_recv_buf + RSRR_HEADER_LEN);
vif_list = (struct rsrr_vif *) (rsrr_send_buf + RSRR_HEADER_LEN);
sendlen = RSRR_HEADER_LEN + numvifs*RSRR_VIF_LEN;
route_reply = (struct rsrr_rr *) (rsrr_send_buf + RSRR_HEADER_LEN);
#define RSRR_RQ_LEN (RSRR_HEADER_LEN + sizeof(struct rsrr_rq))
#define RSRR_RR_LEN (RSRR_HEADER_LEN + sizeof(struct rsrr_rr))