* Initiate (or continue) disconnect. * If embryonic state, just send reset (once). * If in ``let data drain'' option and linger null, just drop. * Otherwise (hard), mark socket disconnecting and drop * current input data; switch states based on user close, and * send segment to peer (with FIN). */
| 2649 | * send segment to peer (with FIN). |
| 2650 | */ |
| 2651 | static void |
| 2652 | tcp_disconnect(struct tcpcb *tp) |
| 2653 | { |
| 2654 | struct inpcb *inp = tp->t_inpcb; |
| 2655 | struct socket *so = inp->inp_socket; |
| 2656 | |
| 2657 | NET_EPOCH_ASSERT(); |
| 2658 | INP_WLOCK_ASSERT(inp); |
| 2659 | |
| 2660 | /* |
| 2661 | * Neither tcp_close() nor tcp_drop() should return NULL, as the |
| 2662 | * socket is still open. |
| 2663 | */ |
| 2664 | if (tp->t_state < TCPS_ESTABLISHED && |
| 2665 | !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) { |
| 2666 | tp = tcp_close(tp); |
| 2667 | KASSERT(tp != NULL, |
| 2668 | ("tcp_disconnect: tcp_close() returned NULL")); |
| 2669 | } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { |
| 2670 | tp = tcp_drop(tp, 0); |
| 2671 | KASSERT(tp != NULL, |
| 2672 | ("tcp_disconnect: tcp_drop() returned NULL")); |
| 2673 | } else { |
| 2674 | soisdisconnecting(so); |
| 2675 | sbflush(&so->so_rcv); |
| 2676 | tcp_usrclosed(tp); |
| 2677 | if (!(inp->inp_flags & INP_DROPPED)) |
| 2678 | tp->t_fb->tfb_tcp_output(tp); |
| 2679 | } |
| 2680 | } |
| 2681 | |
| 2682 | /* |
| 2683 | * User issued close, and wish to trail through shutdown states: |
no test coverage detected