diff options
Diffstat (limited to 'src/vnet/tcp/tcp_input.c')
| -rwxr-xr-x | src/vnet/tcp/tcp_input.c | 138 |
1 files changed, 123 insertions, 15 deletions
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c index f981351c4b9..164a1b3431f 100755 --- a/src/vnet/tcp/tcp_input.c +++ b/src/vnet/tcp/tcp_input.c @@ -266,6 +266,100 @@ tcp_update_timestamp (tcp_connection_t * tc, u32 seq, u32 seq_end) } } +static void +tcp_handle_rst (tcp_connection_t * tc) +{ + switch (tc->rst_state) + { + case TCP_STATE_SYN_RCVD: + /* Cleanup everything. App wasn't notified yet */ + session_transport_delete_notify (&tc->connection); + tcp_connection_cleanup (tc); + break; + case TCP_STATE_SYN_SENT: + session_stream_connect_notify (&tc->connection, 1 /* fail */ ); + tcp_connection_cleanup (tc); + break; + case TCP_STATE_ESTABLISHED: + session_transport_reset_notify (&tc->connection); + session_transport_closed_notify (&tc->connection); + break; + case TCP_STATE_CLOSE_WAIT: + case TCP_STATE_FIN_WAIT_1: + case TCP_STATE_FIN_WAIT_2: + case TCP_STATE_CLOSING: + case TCP_STATE_LAST_ACK: + session_transport_closed_notify (&tc->connection); + break; + case TCP_STATE_CLOSED: + case TCP_STATE_TIME_WAIT: + break; + default: + TCP_DBG ("reset state: %u", tc->state); + } +} + +static void +tcp_program_reset_ntf (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) +{ + if (!tcp_disconnect_pending (tc)) + { + tc->rst_state = tc->state; + vec_add1 (wrk->pending_resets, tc->c_c_index); + tcp_disconnect_pending_on (tc); + } +} + +/** + * Handle reset packet + * + * Programs disconnect/reset notification that should be sent + * later by calling @ref tcp_handle_disconnects + */ +static void +tcp_rcv_rst (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) +{ + TCP_EVT (TCP_EVT_RST_RCVD, tc); + switch (tc->state) + { + case TCP_STATE_SYN_RCVD: + tcp_program_reset_ntf (wrk, tc); + tcp_connection_set_state (tc, TCP_STATE_CLOSED); + break; + case TCP_STATE_SYN_SENT: + tcp_program_reset_ntf (wrk, tc); + tcp_connection_set_state (tc, TCP_STATE_CLOSED); + break; + case TCP_STATE_ESTABLISHED: + tcp_connection_timers_reset (tc); + /* Set the cleanup timer, in case the session layer/app don't + * cleanly close the connection */ + tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time); + tcp_cong_recovery_off (tc); + tcp_program_reset_ntf (wrk, tc); + tcp_connection_set_state (tc, TCP_STATE_CLOSED); + break; + case TCP_STATE_CLOSE_WAIT: + case TCP_STATE_FIN_WAIT_1: + case TCP_STATE_FIN_WAIT_2: + case TCP_STATE_CLOSING: + case TCP_STATE_LAST_ACK: + tcp_connection_timers_reset (tc); + tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time); + tcp_cong_recovery_off (tc); + tcp_program_reset_ntf (wrk, tc); + /* Make sure we mark the session as closed. In some states we may + * be still trying to send data */ + tcp_connection_set_state (tc, TCP_STATE_CLOSED); + break; + case TCP_STATE_CLOSED: + case TCP_STATE_TIME_WAIT: + break; + default: + TCP_DBG ("reset state: %u", tc->state); + } +} + /** * Validate incoming segment as per RFC793 p. 69 and RFC1323 p. 19 * @@ -392,7 +486,7 @@ tcp_segment_validate (tcp_worker_ctx_t * wrk, tcp_connection_t * tc0, /* 2nd: check the RST bit */ if (PREDICT_FALSE (tcp_rst (th0))) { - tcp_connection_reset (tc0); + tcp_rcv_rst (wrk, tc0); *error0 = TCP_ERROR_RST_RCVD; goto error; } @@ -1676,22 +1770,35 @@ tcp_program_disconnect (tcp_worker_ctx_t * wrk, tcp_connection_t * tc) static void tcp_handle_disconnects (tcp_worker_ctx_t * wrk) { - u32 thread_index, *pending_disconnects; + u32 thread_index, *pending_disconnects, *pending_resets; tcp_connection_t *tc; int i; - if (!vec_len (wrk->pending_disconnects)) - return; + if (vec_len (wrk->pending_disconnects)) + { + thread_index = wrk->vm->thread_index; + pending_disconnects = wrk->pending_disconnects; + for (i = 0; i < vec_len (pending_disconnects); i++) + { + tc = tcp_connection_get (pending_disconnects[i], thread_index); + tcp_disconnect_pending_off (tc); + session_transport_closing_notify (&tc->connection); + } + _vec_len (wrk->pending_disconnects) = 0; + } - thread_index = wrk->vm->thread_index; - pending_disconnects = wrk->pending_disconnects; - for (i = 0; i < vec_len (pending_disconnects); i++) + if (vec_len (wrk->pending_resets)) { - tc = tcp_connection_get (pending_disconnects[i], thread_index); - tcp_disconnect_pending_off (tc); - session_transport_closing_notify (&tc->connection); + thread_index = wrk->vm->thread_index; + pending_resets = wrk->pending_resets; + for (i = 0; i < vec_len (pending_resets); i++) + { + tc = tcp_connection_get (pending_resets[i], thread_index); + tcp_disconnect_pending_off (tc); + tcp_handle_rst (tc); + } + _vec_len (wrk->pending_resets) = 0; } - _vec_len (wrk->pending_disconnects) = 0; } static void @@ -2556,7 +2663,7 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, /* If ACK is acceptable, signal client that peer is not * willing to accept connection and drop connection*/ if (tcp_ack (tcp0)) - tcp_connection_reset (tc0); + tcp_rcv_rst (wrk, tc0); error0 = TCP_ERROR_RST_RCVD; goto drop; } @@ -2701,6 +2808,7 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node, my_thread_index); tcp_inc_counter (syn_sent, TCP_ERROR_MSG_QUEUE_FULL, errors); vlib_buffer_free (vm, first_buffer, from_frame->n_vectors); + tcp_handle_disconnects (wrk); return from_frame->n_vectors; } @@ -2837,7 +2945,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, /* Make sure the segment is exactly right */ if (tc0->rcv_nxt != vnet_buffer (b0)->tcp.seq_number || is_fin0) { - tcp_connection_reset (tc0); + tcp_rcv_rst (wrk, tc0); error0 = TCP_ERROR_SEGMENT_INVALID; goto drop; } @@ -2850,7 +2958,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, */ if (tcp_rcv_ack_no_cc (tc0, b0, &error0)) { - tcp_connection_reset (tc0); + tcp_rcv_rst (wrk, tc0); goto drop; } @@ -2877,7 +2985,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node, if (session_stream_accept_notify (&tc0->connection)) { error0 = TCP_ERROR_MSG_QUEUE_FULL; - tcp_connection_reset (tc0); + tcp_rcv_rst (wrk, tc0); goto drop; } error0 = TCP_ERROR_ACK_OK; |