ip_pkt_copy
extern int ip_pkt_copy(ip_pkt_t *, ip_pkt_t *, int);
err = ip_pkt_copy(&lconnp->conn_xmit_ipp, &econnp->conn_xmit_ipp,
error = ip_pkt_copy(&connp->conn_xmit_ipp, ipp, KM_NOSLEEP);
error = ip_pkt_copy(&connp->conn_xmit_ipp, ipp, KM_NOSLEEP);
error = ip_pkt_copy(&connp->conn_xmit_ipp, ipp, KM_NOSLEEP);