* then the TSval from the segment is copied to TS.Recent;
* otherwise, the TSval is ignored.
*/
- if (tcp_opts_tstamp (&tc->rcv_opts) && tc->tsval_recent
- && seq_leq (seq, tc->rcv_las) && seq_leq (tc->rcv_las, seq_end))
+ if (tcp_opts_tstamp (&tc->rcv_opts) && seq_leq (seq, tc->rcv_las)
+ && seq_leq (tc->rcv_las, seq_end))
{
ASSERT (timestamp_leq (tc->tsval_recent, tc->rcv_opts.tsval));
tc->tsval_recent = tc->rcv_opts.tsval;
if (PREDICT_FALSE (tcp_options_parse (th0, &tc0->rcv_opts)))
{
+ clib_warning ("options parse error");
return -1;
}
/* 4th: check the SYN bit */
if (tcp_syn (th0))
{
- tcp_send_reset (b0, tc0->c_is_ip4);
+ /* TODO implement RFC 5961 */
+ if (tc0->state == TCP_STATE_SYN_RCVD)
+ {
+ tcp_make_synack (tc0, b0);
+ TCP_EVT_DBG (TCP_EVT_SYN_RCVD, tc0, 0);
+ }
+ else
+ {
+ tcp_make_ack (tc0, b0);
+ TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, tc0);
+ }
+ *next0 = tcp_next_output (tc0->c_is_ip4);
return -1;
}
tc->rto = clib_max (tc->rto, TCP_RTO_MIN);
}
-/** Update RTT estimate and RTO timer
+/**
+ * Update RTT estimate and RTO timer
*
* Measure RTT: We have two sources of RTT measurements: TSOPT and ACK
* timing. Middle boxes are known to fiddle with TCP options so we
* should give higher priority to ACK timing.
*
+ * This should be called only if previously sent bytes have been acked.
+ *
* return 1 if valid rtt 0 otherwise
*/
static int
tcp_update_rtt (tcp_connection_t * tc, u32 ack)
{
u32 mrtt = 0;
- u8 rtx_acked;
-
- /* Determine if only rtx bytes are acked. */
- rtx_acked = tcp_in_cong_recovery (tc) || !tc->bytes_acked;
/* Karn's rule, part 1. Don't use retransmitted segments to estimate
* RTT because they're ambiguous. */
- if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq) && !rtx_acked)
+ if (tcp_in_cong_recovery (tc) || tc->sack_sb.sacked_bytes)
+ goto done;
+
+ if (tc->rtt_ts && seq_geq (ack, tc->rtt_seq))
{
mrtt = tcp_time_now () - tc->rtt_ts;
}
/* As per RFC7323 TSecr can be used for RTTM only if the segment advances
* snd_una, i.e., the left side of the send window:
- * seq_lt (tc->snd_una, ack). */
- else if (tcp_opts_tstamp (&tc->rcv_opts) && tc->rcv_opts.tsecr
- && tc->bytes_acked)
+ * seq_lt (tc->snd_una, ack). This is a condition for calling update_rtt */
+ else if (tcp_opts_tstamp (&tc->rcv_opts) && tc->rcv_opts.tsecr)
{
mrtt = tcp_time_now () - tc->rcv_opts.tsecr;
}
- /* Allow measuring of a new RTT */
- tc->rtt_ts = 0;
-
- /* If ACK moves left side of the wnd make sure boff is 0, even if mrtt is
- * not valid */
- if (tc->bytes_acked)
- tc->rto_boff = 0;
-
/* Ignore dubious measurements */
if (mrtt == 0 || mrtt > TCP_RTT_MAX)
- return 0;
+ goto done;
tcp_estimate_rtt (tc, mrtt);
+
+done:
+
+ /* Allow measuring of a new RTT */
+ tc->rtt_ts = 0;
+
+ /* If we got here something must've been ACKed so make sure boff is 0,
+ * even if mrrt is not valid since we update the rto lower */
+ tc->rto_boff = 0;
tcp_update_rto (tc);
return 0;
&& (prev_snd_wnd == tc->snd_wnd));
}
-static u8
-tcp_is_lost_fin (tcp_connection_t * tc)
-{
- if ((tc->flags & TCP_CONN_FINSNT) && tc->snd_una_max - tc->snd_una == 1)
- return 1;
- return 0;
-}
-
/**
* Checks if ack is a congestion control event.
*/
tcp_cc_recovery_exit (tcp_connection_t * tc)
{
/* Deflate rto */
- tcp_update_rto (tc);
tc->rto_boff = 0;
+ tcp_update_rto (tc);
tc->snd_rxt_ts = 0;
+ tc->snd_nxt = tc->snd_una_max;
tcp_recovery_off (tc);
+ TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3);
}
void
tc->cc_algo->recovered (tc);
tc->snd_rxt_bytes = 0;
tc->rcv_dupacks = 0;
+ tc->snd_nxt = tc->snd_una_max;
tcp_fastrecovery_off (tc);
tcp_fastrecovery_1_smss_off (tc);
+ TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3);
}
static void
if (tcp_in_recovery (tc))
tcp_cc_recovery_exit (tc);
ASSERT (tc->rto_boff == 0);
+ TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 5);
/* TODO extend for fastrecovery */
}
static u8
tcp_cc_is_spurious_retransmit (tcp_connection_t * tc)
{
- return (tcp_in_recovery (tc)
+ return (tcp_in_recovery (tc) && tc->rto_boff == 1
&& tc->snd_rxt_ts
&& tcp_opts_tstamp (&tc->rcv_opts)
&& timestamp_lt (tc->rcv_opts.tsecr, tc->snd_rxt_ts));
ASSERT (tc->rto_boff == 0);
ASSERT (!tcp_in_cong_recovery (tc));
ASSERT (tcp_scoreboard_is_sane_post_recovery (tc));
- TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3);
return 0;
}
/* Remove retransmitted bytes that have been delivered */
ASSERT (tc->bytes_acked + tc->sack_sb.snd_una_adv
- >= tc->sack_sb.last_bytes_delivered);
+ >= tc->sack_sb.last_bytes_delivered
+ || (tc->flags & TCP_CONN_FINSNT));
if (seq_lt (tc->snd_una, tc->sack_sb.high_rxt))
{
* Looks okay, process feedback
*/
- TCP_EVT_DBG (TCP_EVT_ACK_RCVD, tc);
-
if (tcp_opts_sack_permitted (&tc->rcv_opts))
tcp_rcv_sacks (tc, vnet_buffer (b)->tcp.ack_number);
if (tc->bytes_acked)
tcp_dequeue_acked (tc, vnet_buffer (b)->tcp.ack_number);
+ TCP_EVT_DBG (TCP_EVT_ACK_RCVD, tc);
+
/*
* Check if we have congestion event
*/
if (tcp_ack_is_cc_event (tc, b, prev_snd_wnd, prev_snd_una, &is_dack))
{
tcp_cc_handle_event (tc, is_dack);
+ if (!tcp_in_cong_recovery (tc))
+ return 0;
*error = TCP_ERROR_ACK_DUP;
TCP_EVT_DBG (TCP_EVT_DUPACK_RCVD, tc, 1);
return vnet_buffer (b)->tcp.data_len ? 0 : -1;
tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b,
u16 data_len)
{
- int written;
+ int written, error = TCP_ERROR_ENQUEUED;
ASSERT (seq_geq (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt));
/* Update rcv_nxt */
if (PREDICT_TRUE (written == data_len))
{
- tc->rcv_nxt = vnet_buffer (b)->tcp.seq_end;
+ tc->rcv_nxt += written;
}
/* If more data written than expected, account for out-of-order bytes. */
else if (written > data_len)
{
- tc->rcv_nxt = vnet_buffer (b)->tcp.seq_end + written - data_len;
+ tc->rcv_nxt += written;
/* Send ACK confirming the update */
tc->flags |= TCP_CONN_SNDACK;
* not be enqueued. Inform peer */
tc->flags |= TCP_CONN_SNDACK;
- return TCP_ERROR_PARTIALLY_ENQUEUED;
+ error = TCP_ERROR_PARTIALLY_ENQUEUED;
}
else
{
tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt);
}
- return TCP_ERROR_ENQUEUED;
+ return error;
}
/** Enqueue out-of-order data */
ooo_segment_t *newest;
u32 start, end;
- s0 = stream_session_get (tc->c_s_index, tc->c_thread_index);
+ s0 = session_get (tc->c_s_index, tc->c_thread_index);
/* Get the newest segment from the fifo */
newest = svm_fifo_newest_ooo_segment (s0->server_rx_fifo);
return 1;
}
+static int
+tcp_buffer_discard_bytes (vlib_buffer_t * b, u32 n_bytes_to_drop)
+{
+ u32 discard, first = b->current_length;
+ vlib_main_t *vm = vlib_get_main ();
+
+ /* Handle multi-buffer segments */
+ if (n_bytes_to_drop > b->current_length)
+ {
+ if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
+ return -1;
+ do
+ {
+ discard = clib_min (n_bytes_to_drop, b->current_length);
+ vlib_buffer_advance (b, discard);
+ b = vlib_get_buffer (vm, b->next_buffer);
+ n_bytes_to_drop -= discard;
+ }
+ while (n_bytes_to_drop);
+ if (n_bytes_to_drop > first)
+ b->total_length_not_including_first_buffer -= n_bytes_to_drop - first;
+ }
+ else
+ vlib_buffer_advance (b, n_bytes_to_drop);
+ vnet_buffer (b)->tcp.data_len -= n_bytes_to_drop;
+ return 0;
+}
+
static int
tcp_segment_rcv (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b,
- u16 n_data_bytes, u32 * next0)
+ u32 * next0)
{
- u32 error = 0, n_bytes_to_drop;
+ u32 error = 0, n_bytes_to_drop, n_data_bytes;
+
+ vlib_buffer_advance (b, vnet_buffer (b)->tcp.data_offset);
+ n_data_bytes = vnet_buffer (b)->tcp.data_len;
+ ASSERT (n_data_bytes);
/* Handle out-of-order data */
if (PREDICT_FALSE (vnet_buffer (b)->tcp.seq_number != tc->rcv_nxt))
/* Completely in the past (possible retransmit) */
if (seq_leq (vnet_buffer (b)->tcp.seq_end, tc->rcv_nxt))
- goto done;
+ {
+ /* Ack retransmissions since we may not have any data to send */
+ tcp_make_ack (tc, b);
+ *next0 = tcp_next_output (tc->c_is_ip4);
+ goto done;
+ }
/* Chop off the bytes in the past */
n_bytes_to_drop = tc->rcv_nxt - vnet_buffer (b)->tcp.seq_number;
n_data_bytes -= n_bytes_to_drop;
vnet_buffer (b)->tcp.seq_number = tc->rcv_nxt;
- vlib_buffer_advance (b, n_bytes_to_drop);
+ if (tcp_buffer_discard_bytes (b, n_bytes_to_drop))
+ goto done;
goto in_order;
}
* segments can be enqueued after fifo tail offset changes. */
error = tcp_session_enqueue_data (tc, b, n_data_bytes);
- if (n_data_bytes == 0)
- {
- *next0 = TCP_NEXT_DROP;
- goto done;
- }
-
/* Check if ACK can be delayed */
if (tcp_can_delack (tc))
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
tcp_rx_trace_t *t = va_arg (*args, tcp_rx_trace_t *);
- uword indent = format_get_indent (s);
+ u32 indent = format_get_indent (s);
s = format (s, "%U\n%U%U",
format_tcp_header, &t->tcp_header, 128,
}
th0 = tcp_buffer_hdr (b0);
- is_fin = (th0->flags & TCP_FLAG_FIN) != 0;
+ /* N.B. buffer is rewritten if segment is ooo. Thus, th0 becomes a
+ * dangling reference. */
+ is_fin = tcp_is_fin (th0);
/* SYNs, FINs and data consume sequence numbers */
vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number
/* 5: check the ACK field */
if (tcp_rcv_ack (tc0, b0, th0, &next0, &error0))
- {
- goto done;
- }
+ goto done;
/* 6: check the URG bit TODO */
/* 7: process the segment text */
-
- vlib_buffer_advance (b0, vnet_buffer (b0)->tcp.data_offset);
- error0 = tcp_segment_rcv (tm, tc0, b0,
- vnet_buffer (b0)->tcp.data_len, &next0);
-
- /* N.B. buffer is rewritten if segment is ooo. Thus, th0 becomes a
- * dangling reference. */
+ if (vnet_buffer (b0)->tcp.data_len)
+ error0 = tcp_segment_rcv (tm, tc0, b0, &next0);
/* 8: check the FIN bit */
- if (is_fin)
+ if (PREDICT_FALSE (is_fin))
{
- /* Enter CLOSE-WAIT and notify session. Don't send ACK, instead
- * wait for session to call close. To avoid lingering
+ /* Enter CLOSE-WAIT and notify session. To avoid lingering
* in CLOSE-WAIT, set timer (reuse WAITCLOSE). */
+ /* Account for the FIN if nothing else was received */
+ if (vnet_buffer (b0)->tcp.data_len == 0)
+ tc0->rcv_nxt += 1;
+ tcp_make_ack (tc0, b0);
+ next0 = tcp_next_output (tc0->c_is_ip4);
tc0->state = TCP_STATE_CLOSE_WAIT;
- TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0);
stream_session_disconnect_notify (&tc0->connection);
- tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
+ TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0);
}
done:
errors = session_manager_flush_enqueue_events (my_thread_index);
tcp_established_inc_counter (vm, is_ip4, TCP_ERROR_EVENT_FIFO_FULL, errors);
+ tcp_flush_frame_to_output (vm, my_thread_index, is_ip4);
+
return from_frame->n_vectors;
}
vlib_node_registration_t tcp4_syn_sent_node;
vlib_node_registration_t tcp6_syn_sent_node;
+static u8
+tcp_lookup_is_valid (tcp_connection_t * tc, tcp_header_t * hdr)
+{
+ transport_connection_t *tmp = 0;
+ u64 handle;
+
+ if (!tc)
+ return 1;
+
+ u8 is_valid = (tc->c_lcl_port == hdr->dst_port
+ && (tc->state == TCP_STATE_LISTEN
+ || tc->c_rmt_port == hdr->src_port));
+
+ if (!is_valid)
+ {
+ handle = session_lookup_half_open_handle (&tc->connection);
+ tmp = session_lookup_half_open_connection (handle & 0xFFFFFFFF,
+ tc->c_transport_proto,
+ tc->c_is_ip4);
+
+ if (tmp)
+ {
+ if (tmp->lcl_port == hdr->dst_port
+ && tmp->rmt_port == hdr->src_port)
+ {
+ TCP_DBG ("half-open is valid!");
+ }
+ }
+ }
+ return is_valid;
+}
+
+/**
+ * Lookup transport connection
+ */
+static tcp_connection_t *
+tcp_lookup_connection (u32 fib_index, vlib_buffer_t * b, u8 thread_index,
+ u8 is_ip4)
+{
+ tcp_header_t *tcp;
+ transport_connection_t *tconn;
+ tcp_connection_t *tc;
+ if (is_ip4)
+ {
+ ip4_header_t *ip4;
+ ip4 = vlib_buffer_get_current (b);
+ tcp = ip4_next_header (ip4);
+ tconn = session_lookup_connection_wt4 (fib_index,
+ &ip4->dst_address,
+ &ip4->src_address,
+ tcp->dst_port,
+ tcp->src_port,
+ TRANSPORT_PROTO_TCP,
+ thread_index);
+ tc = tcp_get_connection_from_transport (tconn);
+ ASSERT (tcp_lookup_is_valid (tc, tcp));
+ }
+ else
+ {
+ ip6_header_t *ip6;
+ ip6 = vlib_buffer_get_current (b);
+ tcp = ip6_next_header (ip6);
+ tconn = session_lookup_connection_wt6 (fib_index,
+ &ip6->dst_address,
+ &ip6->src_address,
+ tcp->dst_port,
+ tcp->src_port,
+ TRANSPORT_PROTO_TCP,
+ thread_index);
+ tc = tcp_get_connection_from_transport (tconn);
+ ASSERT (tcp_lookup_is_valid (tc, tcp));
+ }
+ return tc;
+}
+
always_inline uword
tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * from_frame, int is_ip4)
tcp_main_t *tm = vnet_get_tcp_main ();
u32 n_left_from, next_index, *from, *to_next;
u32 my_thread_index = vm->thread_index, errors = 0;
- u8 sst = is_ip4 ? SESSION_TYPE_IP4_TCP : SESSION_TYPE_IP6_TCP;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
tc0 =
tcp_half_open_connection_get (vnet_buffer (b0)->
tcp.connection_index);
+ if (PREDICT_FALSE (tc0 == 0))
+ {
+ error0 = TCP_ERROR_INVALID_CONNECTION;
+ goto drop;
+ }
+
+ /* Half-open completed recently but the connection was't removed
+ * yet by the owning thread */
+ if (PREDICT_FALSE (tc0->flags & TCP_CONN_HALF_OPEN_DONE))
+ {
+ /* Make sure the connection actually exists */
+ ASSERT (tcp_lookup_connection (tc0->c_fib_index, b0,
+ my_thread_index, is_ip4));
+ goto drop;
+ }
ack0 = vnet_buffer (b0)->tcp.ack_number;
seq0 = vnet_buffer (b0)->tcp.seq_number;
tcp0 = tcp_buffer_hdr (b0);
+ /* Crude check to see if the connection handle does not match
+ * the packet. Probably connection just switched to established */
+ if (PREDICT_FALSE (tcp0->dst_port != tc0->c_lcl_port
+ || tcp0->src_port != tc0->c_rmt_port))
+ goto drop;
+
if (PREDICT_FALSE
(!tcp_ack (tcp0) && !tcp_rst (tcp0) && !tcp_syn (tcp0)))
goto drop;
*/
if (tcp_ack (tcp0))
{
- if (ack0 <= tc0->iss || ack0 > tc0->snd_nxt)
+ if (seq_leq (ack0, tc0->iss) || seq_gt (ack0, tc0->snd_nxt))
{
+ clib_warning ("ack not in rcv wnd");
if (!tcp_rst (tcp0))
- tcp_send_reset (b0, is_ip4);
-
+ tcp_send_reset_w_pkt (tc0, b0, is_ip4);
goto drop;
}
/* Make sure ACK is valid */
- if (tc0->snd_una > ack0)
- goto drop;
+ if (seq_gt (tc0->snd_una, ack0))
+ {
+ clib_warning ("ack invalid");
+ goto drop;
+ }
}
/*
/* If ACK is acceptable, signal client that peer is not
* willing to accept connection and drop connection*/
if (tcp_ack (tcp0))
- {
- stream_session_connect_notify (&tc0->connection, sst,
- 1 /* fail */ );
- tcp_connection_cleanup (tc0);
- }
+ tcp_connection_reset (tc0);
goto drop;
}
/* No SYN flag. Drop. */
if (!tcp_syn (tcp0))
- goto drop;
+ {
+ clib_warning ("not synack");
+ goto drop;
+ }
- /* Stop connection establishment and retransmit timers */
- tcp_timer_reset (tc0, TCP_TIMER_ESTABLISH);
- tcp_timer_reset (tc0, TCP_TIMER_RETRANSMIT_SYN);
+ /* Parse options */
+ if (tcp_options_parse (tcp0, &tc0->rcv_opts))
+ {
+ clib_warning ("options parse fail");
+ goto drop;
+ }
/* Valid SYN or SYN-ACK. Move connection from half-open pool to
* current thread pool. */
pool_get (tm->connections[my_thread_index], new_tc0);
clib_memcpy (new_tc0, tc0, sizeof (*new_tc0));
-
- new_tc0->c_thread_index = my_thread_index;
new_tc0->c_c_index = new_tc0 - tm->connections[my_thread_index];
-
- /* Cleanup half-open connection XXX lock */
- pool_put (tm->half_open_connections, tc0);
-
+ new_tc0->c_thread_index = my_thread_index;
new_tc0->rcv_nxt = vnet_buffer (b0)->tcp.seq_end;
new_tc0->irs = seq0;
+ new_tc0->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID;
+ new_tc0->timers[TCP_TIMER_RETRANSMIT_SYN] =
+ TCP_TIMER_HANDLE_INVALID;
- /* Parse options */
- if (tcp_options_parse (tcp0, &new_tc0->rcv_opts))
- goto drop;
+ /* If this is not the owning thread, wait for syn retransmit to
+ * expire and cleanup then */
+ if (tcp_half_open_connection_cleanup (tc0))
+ tc0->flags |= TCP_CONN_HALF_OPEN_DONE;
if (tcp_opts_tstamp (&new_tc0->rcv_opts))
{
if (tcp_opts_wscale (&new_tc0->rcv_opts))
new_tc0->snd_wscale = new_tc0->rcv_opts.wscale;
- new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window)
- << new_tc0->snd_wscale;
+ /* RFC1323: SYN and SYN-ACK wnd not scaled */
+ new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window);
new_tc0->snd_wl1 = seq0;
new_tc0->snd_wl2 = ack0;
tcp_connection_init_vars (new_tc0);
/* SYN-ACK: See if we can switch to ESTABLISHED state */
- if (tcp_ack (tcp0))
+ if (PREDICT_TRUE (tcp_ack (tcp0)))
{
/* Our SYN is ACKed: we have iss < ack = snd_una */
/* Notify app that we have connection. If session layer can't
* allocate session send reset */
- if (stream_session_connect_notify (&new_tc0->connection, sst,
- 0))
+ if (stream_session_connect_notify (&new_tc0->connection, 0))
{
+ clib_warning ("connect notify fail");
+ tcp_send_reset_w_pkt (new_tc0, b0, is_ip4);
tcp_connection_cleanup (new_tc0);
- tcp_send_reset (b0, is_ip4);
goto drop;
}
new_tc0->flags |= TCP_CONN_SNDACK;
/* Update rtt with the syn-ack sample */
- new_tc0->bytes_acked = 1;
tcp_update_rtt (new_tc0, vnet_buffer (b0)->tcp.ack_number);
+ TCP_EVT_DBG (TCP_EVT_SYNACK_RCVD, new_tc0);
}
/* SYN: Simultaneous open. Change state to SYN-RCVD and send SYN-ACK */
else
new_tc0->state = TCP_STATE_SYN_RCVD;
/* Notify app that we have connection */
- if (stream_session_connect_notify
- (&new_tc0->connection, sst, 0))
+ if (stream_session_connect_notify (&new_tc0->connection, 0))
{
tcp_connection_cleanup (new_tc0);
- tcp_send_reset (b0, is_ip4);
+ tcp_send_reset_w_pkt (tc0, b0, is_ip4);
+ TCP_EVT_DBG (TCP_EVT_RST_SENT, tc0);
goto drop;
}
tc0->rtt_ts = 0;
-
+ tcp_init_snd_vars (tc0);
tcp_make_synack (new_tc0, b0);
next0 = tcp_next_output (is_ip4);
}
/* Read data, if any */
- if (vnet_buffer (b0)->tcp.data_len)
+ if (PREDICT_FALSE (vnet_buffer (b0)->tcp.data_len))
{
- vlib_buffer_advance (b0, vnet_buffer (b0)->tcp.data_offset);
- error0 = tcp_segment_rcv (tm, new_tc0, b0,
- vnet_buffer (b0)->tcp.data_len,
- &next0);
+ ASSERT (0);
+ error0 = tcp_segment_rcv (tm, new_tc0, b0, &next0);
if (error0 == TCP_ERROR_PURE_ACK)
error0 = TCP_ERROR_SYN_ACKS_RCVD;
}
drop:
b0->error = error0 ? node->errors[error0] : 0;
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ if (PREDICT_FALSE
+ ((b0->flags & VLIB_BUFFER_IS_TRACED) && tcp0 != 0))
{
t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
clib_memcpy (&t0->tcp_header, tcp0, sizeof (t0->tcp_header));
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (tcp6_syn_sent_node, tcp6_syn_sent_rcv);
+
/**
* Handles reception for all states except LISTEN, SYN-SENT and ESTABLISHED
* as per RFC793 p. 64
tcp_header_t *tcp0 = 0;
tcp_connection_t *tc0;
u32 next0 = TCP_RCV_PROCESS_NEXT_DROP, error0 = TCP_ERROR_ENQUEUED;
+ u8 is_fin0;
bi0 = from[0];
to_next[0] = bi0;
}
tcp0 = tcp_buffer_hdr (b0);
+ is_fin0 = tcp_is_fin (tcp0);
/* SYNs, FINs and data consume sequence numbers */
vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number
- + tcp_is_syn (tcp0) + tcp_is_fin (tcp0)
- + vnet_buffer (b0)->tcp.data_len;
+ + tcp_is_syn (tcp0) + is_fin0 + vnet_buffer (b0)->tcp.data_len;
+
+ if (CLIB_DEBUG)
+ {
+ tcp_connection_t *tmp;
+ tmp =
+ tcp_lookup_connection (tc0->c_fib_index, b0, my_thread_index,
+ is_ip4);
+ if (tmp->state != tc0->state)
+ {
+ clib_warning ("state changed");
+ ASSERT (0);
+ goto drop;
+ }
+ }
/*
* Special treatment for CLOSED
*/
/* 1-4: check SEQ, RST, SYN */
- if (PREDICT_FALSE
- (tcp_segment_validate (vm, tc0, b0, tcp0, &next0)))
+ if (PREDICT_FALSE (tcp_segment_validate (vm, tc0, b0, tcp0,
+ &next0)))
{
error0 = TCP_ERROR_SEGMENT_INVALID;
goto drop;
*/
if (!tcp_rcv_ack_is_acceptable (tc0, b0))
{
- tcp_send_reset (b0, is_ip4);
+ TCP_DBG ("connection not accepted");
+ tcp_send_reset_w_pkt (tc0, b0, is_ip4);
goto drop;
}
/* Update rtt and rto */
- tc0->bytes_acked = 1;
tcp_update_rtt (tc0, vnet_buffer (b0)->tcp.ack_number);
/* Switch state to ESTABLISHED */
tc0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number;
stream_session_accept_notify (&tc0->connection);
- /* Reset SYN-ACK retransmit timer */
+ /* Reset SYN-ACK retransmit and SYN_RCV establish timers */
tcp_retransmit_timer_reset (tc0);
+ tcp_timer_reset (tc0, TCP_TIMER_ESTABLISH);
+ TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
break;
case TCP_STATE_ESTABLISHED:
/* We can get packets in established state here because they
if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
goto drop;
+ /* Still have to send the FIN */
+ if (tc0->flags & TCP_CONN_FINPNDG)
+ {
+ /* TX fifo finally drained */
+ if (!stream_session_tx_fifo_max_dequeue (&tc0->connection))
+ tcp_send_fin (tc0);
+ }
/* If FIN is ACKed */
- if (tc0->snd_una == tc0->snd_una_max)
+ else if (tc0->snd_una == tc0->snd_una_max)
{
- ASSERT (tcp_fin (tcp0));
tc0->state = TCP_STATE_FIN_WAIT_2;
- /* Stop all timers, 2MSL will be set lower */
+ TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
+
+ /* Stop all retransmit timers because we have nothing more
+ * to send. Enable waitclose though because we're willing to
+ * wait for peer's FIN but not indefinitely. */
tcp_connection_timers_reset (tc0);
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
}
break;
case TCP_STATE_FIN_WAIT_2:
* acknowledged ("ok") but do not delete the TCB. */
if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
goto drop;
- /* check if rtx queue is empty and ack CLOSE TODO */
break;
case TCP_STATE_CLOSE_WAIT:
/* Do the same processing as for the ESTABLISHED state. */
if (tcp_rcv_ack (tc0, b0, tcp0, &next0, &error0))
goto drop;
- /* XXX test that send queue empty */
tc0->state = TCP_STATE_TIME_WAIT;
+ TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
goto drop;
break;
* delete the TCB, enter the CLOSED state, and return. */
if (!tcp_rcv_ack_is_acceptable (tc0, b0))
- goto drop;
+ {
+ error0 = TCP_ERROR_ACK_INVALID;
+ goto drop;
+ }
- /* Apparently our FIN was lost */
- if (tcp_fin (tcp0))
+ tc0->snd_una = vnet_buffer (b0)->tcp.ack_number;
+ /* Apparently our ACK for the peer's FIN was lost */
+ if (is_fin0 && tc0->snd_una != tc0->snd_una_max)
{
- /* Don't "make" fin since that increments snd_nxt */
tcp_send_fin (tc0);
goto drop;
}
tc0->state = TCP_STATE_CLOSED;
+ TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
+ tcp_connection_timers_reset (tc0);
/* Don't delete the connection/session yet. Instead, wait a
* reasonable amount of time until the pipes are cleared. In
* particular, this makes sure that we won't have dead sessions
* when processing events on the tx path */
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
-
- /* Stop retransmit */
- tcp_retransmit_timer_reset (tc0);
+ tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
goto drop;
goto drop;
tcp_make_ack (tc0, b0);
- tcp_timer_reset (tc0, TCP_TIMER_WAITCLOSE);
- tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
+ next0 = tcp_next_output (is_ip4);
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
goto drop;
case TCP_STATE_ESTABLISHED:
case TCP_STATE_FIN_WAIT_1:
case TCP_STATE_FIN_WAIT_2:
- vlib_buffer_advance (b0, vnet_buffer (b0)->tcp.data_offset);
- error0 = tcp_segment_rcv (tm, tc0, b0,
- vnet_buffer (b0)->tcp.data_len,
- &next0);
+ if (vnet_buffer (b0)->tcp.data_len)
+ error0 = tcp_segment_rcv (tm, tc0, b0, &next0);
+ else if (is_fin0)
+ tc0->rcv_nxt += 1;
break;
case TCP_STATE_CLOSE_WAIT:
case TCP_STATE_CLOSING:
}
/* 8: check the FIN bit */
- if (!tcp_fin (tcp0))
+ if (!is_fin0)
goto drop;
switch (tc0->state)
/* Send FIN-ACK notify app and enter CLOSE-WAIT */
tcp_connection_timers_reset (tc0);
tcp_make_fin (tc0, b0);
+ tc0->snd_nxt += 1;
next0 = tcp_next_output (tc0->c_is_ip4);
stream_session_disconnect_notify (&tc0->connection);
tc0->state = TCP_STATE_CLOSE_WAIT;
+ TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
break;
case TCP_STATE_CLOSE_WAIT:
case TCP_STATE_CLOSING:
/* move along .. */
break;
case TCP_STATE_FIN_WAIT_1:
- tc0->state = TCP_STATE_TIME_WAIT;
- tcp_connection_timers_reset (tc0);
- tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
+ tc0->state = TCP_STATE_CLOSING;
+ tcp_make_ack (tc0, b0);
+ next0 = tcp_next_output (is_ip4);
+ TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
+ /* Wait for ACK but not forever */
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
break;
case TCP_STATE_FIN_WAIT_2:
- /* Got FIN, send ACK! */
+ /* Got FIN, send ACK! Be more aggressive with resource cleanup */
tc0->state = TCP_STATE_TIME_WAIT;
tcp_connection_timers_reset (tc0);
- tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
tcp_make_ack (tc0, b0);
next0 = tcp_next_output (is_ip4);
+ TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc0);
break;
case TCP_STATE_TIME_WAIT:
- /* Remain in the TIME-WAIT state. Restart the 2 MSL time-wait
+ /* Remain in the TIME-WAIT state. Restart the time-wait
* timeout.
*/
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
+ tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
break;
}
TCP_EVT_DBG (TCP_EVT_FIN_RCVD, tc0);
{
u32 n_left_from, next_index, *from, *to_next;
u32 my_thread_index = vm->thread_index;
- tcp_main_t *tm = vnet_get_tcp_main ();
- u8 sst = is_ip4 ? SESSION_TYPE_IP4_TCP : SESSION_TYPE_IP6_TCP;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
/* 3. check for a SYN (did that already) */
- /* Create child session and send SYN-ACK */
- pool_get (tm->connections[my_thread_index], child0);
- memset (child0, 0, sizeof (*child0));
+ /* Make sure connection wasn't just created */
+ child0 =
+ tcp_lookup_connection (lc0->c_fib_index, b0, my_thread_index,
+ is_ip4);
+ if (PREDICT_FALSE (child0->state != TCP_STATE_LISTEN))
+ {
+ error0 = TCP_ERROR_CREATE_EXISTS;
+ goto drop;
+ }
- child0->c_c_index = child0 - tm->connections[my_thread_index];
+ /* Create child session and send SYN-ACK */
+ child0 = tcp_connection_new (my_thread_index);
child0->c_lcl_port = lc0->c_lcl_port;
child0->c_rmt_port = th0->src_port;
child0->c_is_ip4 = is_ip4;
- child0->c_thread_index = my_thread_index;
child0->state = TCP_STATE_SYN_RCVD;
if (is_ip4)
sizeof (ip6_address_t));
}
- if (stream_session_accept (&child0->connection, lc0->c_s_index, sst,
+ if (stream_session_accept (&child0->connection, lc0->c_s_index,
0 /* notify */ ))
{
+ clib_warning ("session accept fail");
+ tcp_connection_cleanup (child0);
error0 = TCP_ERROR_CREATE_SESSION_FAIL;
goto drop;
}
if (tcp_options_parse (th0, &child0->rcv_opts))
{
+ clib_warning ("options parse fail");
goto drop;
}
child0->snd_wl2 = vnet_buffer (b0)->tcp.ack_number;
tcp_connection_init_vars (child0);
-
- TCP_EVT_DBG (TCP_EVT_SYN_RCVD, child0);
+ TCP_EVT_DBG (TCP_EVT_SYN_RCVD, child0, 1);
/* Reuse buffer to make syn-ack and send */
tcp_make_synack (child0, b0);
next0 = tcp_next_output (is_ip4);
+ tcp_timer_set (child0, TCP_TIMER_ESTABLISH, TCP_SYN_RCVD_TIME);
drop:
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
TCP_INPUT_NEXT_SYN_SENT,
TCP_INPUT_NEXT_ESTABLISHED,
TCP_INPUT_NEXT_RESET,
+ TCP_INPUT_NEXT_PUNT,
TCP_INPUT_N_NEXT
} tcp_input_next_t;
_ (RCV_PROCESS, "tcp4-rcv-process") \
_ (SYN_SENT, "tcp4-syn-sent") \
_ (ESTABLISHED, "tcp4-established") \
- _ (RESET, "tcp4-reset")
+ _ (RESET, "tcp4-reset") \
+ _ (PUNT, "error-punt")
#define foreach_tcp6_input_next \
_ (DROP, "error-drop") \
_ (RCV_PROCESS, "tcp6-rcv-process") \
_ (SYN_SENT, "tcp6-syn-sent") \
_ (ESTABLISHED, "tcp6-established") \
- _ (RESET, "tcp6-reset")
+ _ (RESET, "tcp6-reset") \
+ _ (PUNT, "error-punt")
#define filter_flags (TCP_FLAG_SYN|TCP_FLAG_ACK|TCP_FLAG_RST|TCP_FLAG_FIN)
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
-
next_index = node->cached_next_index;
+ tcp_set_time_now (my_thread_index);
while (n_left_from > 0)
{
while (n_left_from > 0 && n_left_to_next > 0)
{
int n_advance_bytes0, n_data_bytes0;
- u32 bi0;
+ u32 bi0, fib_index0;
vlib_buffer_t *b0;
tcp_header_t *tcp0 = 0;
tcp_connection_t *tc0;
+ transport_connection_t *tconn;
ip4_header_t *ip40;
ip6_header_t *ip60;
u32 error0 = TCP_ERROR_NO_LISTENER, next0 = TCP_INPUT_NEXT_DROP;
b0 = vlib_get_buffer (vm, bi0);
vnet_buffer (b0)->tcp.flags = 0;
+ fib_index0 = vnet_buffer (b0)->ip.fib_index;
/* Checksum computed by ipx_local no need to compute again */
+ tcp_header_bytes (tcp0));
n_data_bytes0 = clib_net_to_host_u16 (ip40->length)
- n_advance_bytes0;
-
- /* lookup session */
- tc0 =
- (tcp_connection_t *)
- stream_session_lookup_transport_wt4 (&ip40->dst_address,
- &ip40->src_address,
- tcp0->dst_port,
- tcp0->src_port,
- SESSION_TYPE_IP4_TCP,
- my_thread_index);
+ tconn =
+ session_lookup_connection_wt4 (fib_index0, &ip40->dst_address,
+ &ip40->src_address,
+ tcp0->dst_port, tcp0->src_port,
+ TRANSPORT_PROTO_TCP,
+ my_thread_index);
+ tc0 = tcp_get_connection_from_transport (tconn);
+ ASSERT (tcp_lookup_is_valid (tc0, tcp0));
}
else
{
n_data_bytes0 = clib_net_to_host_u16 (ip60->payload_length)
- n_advance_bytes0;
n_advance_bytes0 += sizeof (ip60[0]);
-
- tc0 =
- (tcp_connection_t *)
- stream_session_lookup_transport_wt6 (&ip60->src_address,
- &ip60->dst_address,
- tcp0->src_port,
- tcp0->dst_port,
- SESSION_TYPE_IP6_TCP,
- my_thread_index);
+ tconn =
+ session_lookup_connection_wt6 (fib_index0, &ip60->dst_address,
+ &ip60->src_address,
+ tcp0->dst_port, tcp0->src_port,
+ TRANSPORT_PROTO_TCP,
+ my_thread_index);
+ tc0 = tcp_get_connection_from_transport (tconn);
+ ASSERT (tcp_lookup_is_valid (tc0, tcp0));
}
/* Length check */
}
else
{
- /* Send reset */
- next0 = TCP_INPUT_NEXT_RESET;
- error0 = TCP_ERROR_NO_LISTENER;
+ if ((is_ip4 && tm->punt_unknown4) ||
+ (!is_ip4 && tm->punt_unknown6))
+ {
+ next0 = TCP_INPUT_NEXT_PUNT;
+ error0 = TCP_ERROR_PUNT;
+ }
+ else
+ {
+ /* Send reset */
+ next0 = TCP_INPUT_NEXT_RESET;
+ error0 = TCP_ERROR_NO_LISTENER;
+ }
}
done:
_(TIME_WAIT, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS,
TCP_ERROR_NONE);
_(TIME_WAIT, TCP_FLAG_RST, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
- _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED);
+ _(TIME_WAIT, TCP_FLAG_ACK, TCP_INPUT_NEXT_RCV_PROCESS, TCP_ERROR_NONE);
+ _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED);
_(CLOSED, TCP_FLAG_RST, TCP_INPUT_NEXT_DROP, TCP_ERROR_CONNECTION_CLOSED);
- _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
+ _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
TCP_ERROR_CONNECTION_CLOSED);
#undef _
}
Code Review / vpp.git / blobdiff