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_tx_trace_t *t = va_arg (*args, tcp_tx_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,
}
static u8
-tcp_window_compute_scale (u32 available_space)
+tcp_window_compute_scale (u32 window)
{
u8 wnd_scale = 0;
- while (wnd_scale < TCP_MAX_WND_SCALE
- && (available_space >> wnd_scale) > TCP_WND_MAX)
+ while (wnd_scale < TCP_MAX_WND_SCALE && (window >> wnd_scale) > TCP_WND_MAX)
wnd_scale++;
return wnd_scale;
}
always_inline int
tcp_alloc_tx_buffers (tcp_main_t * tm, u8 thread_index, u32 n_free_buffers)
{
- vec_validate (tm->tx_buffers[thread_index], n_free_buffers - 1);
- _vec_len (tm->tx_buffers[thread_index]) =
- vlib_buffer_alloc_from_free_list (vlib_get_main (),
- tm->tx_buffers[thread_index],
- n_free_buffers,
- VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
+ vlib_main_t *vm = vlib_get_main ();
+ u32 current_length = vec_len (tm->tx_buffers[thread_index]);
+ u32 n_allocated;
+
+ vec_validate (tm->tx_buffers[thread_index],
+ current_length + n_free_buffers - 1);
+ n_allocated =
+ vlib_buffer_alloc (vm, &tm->tx_buffers[thread_index][current_length],
+ n_free_buffers);
+ _vec_len (tm->tx_buffers[thread_index]) = current_length + n_allocated;
/* buffer shortage, report failure */
if (vec_len (tm->tx_buffers[thread_index]) == 0)
{
return -1;
}
my_tx_buffers = tm->tx_buffers[thread_index];
- *bidx = my_tx_buffers[_vec_len (my_tx_buffers) - 1];
+ *bidx = my_tx_buffers[vec_len (my_tx_buffers) - 1];
_vec_len (my_tx_buffers) -= 1;
return 0;
}
always_inline void
tcp_return_buffer (tcp_main_t * tm)
{
- u32 *my_tx_buffers;
- u32 thread_index = vlib_get_thread_index ();
- my_tx_buffers = tm->tx_buffers[thread_index];
- _vec_len (my_tx_buffers) += 1;
+ _vec_len (tm->tx_buffers[vlib_get_thread_index ()]) += 1;
}
-always_inline void
+always_inline void *
tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b)
{
- vlib_buffer_t *it = b;
- u32 save_free_list = b->flags & VLIB_BUFFER_FREE_LIST_INDEX_MASK;
- do
- {
- it->current_data = 0;
- it->current_length = 0;
- it->total_length_not_including_first_buffer = 0;
- }
- while ((it->flags & VLIB_BUFFER_NEXT_PRESENT)
- && (it = vlib_get_buffer (vm, it->next_buffer)));
-
if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
vlib_buffer_free_one (vm, b->next_buffer);
- b->flags = save_free_list;
+ /* Zero all flags but free list index and trace flag */
+ b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1;
+ b->current_data = 0;
+ b->current_length = 0;
+ b->total_length_not_including_first_buffer = 0;
+ vnet_buffer (b)->tcp.flags = 0;
/* Leave enough space for headers */
- vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
+ return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
+}
+
+always_inline void *
+tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b)
+{
+ ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
+ b->flags &= VLIB_BUFFER_FREE_LIST_INDEX_MASK;
+ b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
+ b->total_length_not_including_first_buffer = 0;
vnet_buffer (b)->tcp.flags = 0;
+
+ /* Leave enough space for headers */
+ return vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
}
/**
/* Reset flags, make sure ack is sent */
vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK;
+}
- tc->snd_nxt += 1;
+/**
+ * Convert buffer to SYN
+ */
+void
+tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b)
+{
+ u8 tcp_hdr_opts_len, tcp_opts_len;
+ tcp_header_t *th;
+ u16 initial_wnd;
+ tcp_options_t snd_opts;
+
+ initial_wnd = tcp_initial_window_to_advertise (tc);
+
+ /* Make and write options */
+ memset (&snd_opts, 0, sizeof (snd_opts));
+ tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
+ tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
+
+ th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
+ tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
+ initial_wnd);
+ vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
+ tcp_options_write ((u8 *) (th + 1), &snd_opts);
+
+ tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
+ tc->rto * TCP_TO_TIMER_TICK);
}
/**
u8 tcp_opts_len, tcp_hdr_opts_len;
tcp_header_t *th;
u16 initial_wnd;
- u32 time_now;
memset (snd_opts, 0, sizeof (*snd_opts));
-
tcp_reuse_buffer (vm, b);
- /* Set random initial sequence */
- time_now = tcp_time_now ();
-
- tc->iss = random_u32 (&time_now);
- tc->snd_una = tc->iss;
- tc->snd_nxt = tc->iss + 1;
- tc->snd_una_max = tc->snd_nxt;
-
initial_wnd = tcp_initial_window_to_advertise (tc);
-
- /* Make and write options */
tcp_opts_len = tcp_make_synack_options (tc, snd_opts);
tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
tc->rcv_nxt, tcp_hdr_opts_len,
TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd);
-
tcp_options_write ((u8 *) (th + 1), snd_opts);
vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK;
- /* Init retransmit timer */
- tcp_retransmit_timer_set (tc);
+ /* Init retransmit timer. Use update instead of set because of
+ * retransmissions */
+ tcp_retransmit_timer_force_update (tc);
TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc);
}
always_inline void
-tcp_enqueue_to_ip_lookup (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
- u8 is_ip4)
+tcp_enqueue_to_ip_lookup_i (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
+ u8 is_ip4, u8 flush)
{
+ tcp_main_t *tm = vnet_get_tcp_main ();
+ u32 thread_index = vlib_get_thread_index ();
u32 *to_next, next_index;
vlib_frame_t *f;
/* Send to IP lookup */
next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
- f = vlib_get_frame_to_node (vm, next_index);
+ if (VLIB_BUFFER_TRACE_TRAJECTORY > 0)
+ {
+ b->pre_data[0] = 2;
+ b->pre_data[1] = next_index;
+ }
+
+ f = tm->ip_lookup_tx_frames[!is_ip4][thread_index];
+ if (!f)
+ {
+ f = vlib_get_frame_to_node (vm, next_index);
+ ASSERT (f);
+ tm->ip_lookup_tx_frames[!is_ip4][thread_index] = f;
+ }
- /* Enqueue the packet */
to_next = vlib_frame_vector_args (f);
- to_next[0] = bi;
- f->n_vectors = 1;
- vlib_put_frame_to_node (vm, next_index, f);
+ to_next[f->n_vectors] = bi;
+ f->n_vectors += 1;
+ if (flush || f->n_vectors == VLIB_FRAME_SIZE)
+ {
+ vlib_put_frame_to_node (vm, next_index, f);
+ tm->ip_lookup_tx_frames[!is_ip4][thread_index] = 0;
+ }
+}
+
+always_inline void
+tcp_enqueue_to_ip_lookup_now (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
+ u8 is_ip4)
+{
+ tcp_enqueue_to_ip_lookup_i (vm, b, bi, is_ip4, 1);
+}
+
+always_inline void
+tcp_enqueue_to_ip_lookup (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
+ u8 is_ip4)
+{
+ tcp_enqueue_to_ip_lookup_i (vm, b, bi, is_ip4, 0);
+}
+
+always_inline void
+tcp_enqueue_to_output_i (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
+ u8 is_ip4, u8 flush)
+{
+ tcp_main_t *tm = vnet_get_tcp_main ();
+ u32 thread_index = vlib_get_thread_index ();
+ u32 *to_next, next_index;
+ vlib_frame_t *f;
+
+ b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
+ b->error = 0;
+
+ /* Decide where to send the packet */
+ next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
+ if (VLIB_BUFFER_TRACE_TRAJECTORY > 0)
+ {
+ b->pre_data[0] = 1;
+ b->pre_data[1] = next_index;
+ }
+
+ /* Get frame to v4/6 output node */
+ f = tm->tx_frames[!is_ip4][thread_index];
+ if (!f)
+ {
+ f = vlib_get_frame_to_node (vm, next_index);
+ ASSERT (f);
+ tm->tx_frames[!is_ip4][thread_index] = f;
+ }
+ to_next = vlib_frame_vector_args (f);
+ to_next[f->n_vectors] = bi;
+ f->n_vectors += 1;
+ if (flush || f->n_vectors == VLIB_FRAME_SIZE)
+ {
+ vlib_put_frame_to_node (vm, next_index, f);
+ tm->tx_frames[!is_ip4][thread_index] = 0;
+ }
+}
+
+always_inline void
+tcp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, u8 is_ip4)
+{
+ tcp_enqueue_to_output_i (vm, b, bi, is_ip4, 0);
+}
+
+always_inline void
+tcp_enqueue_to_output_now (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
+ u8 is_ip4)
+{
+ tcp_enqueue_to_output_i (vm, b, bi, is_ip4, 1);
}
int
/**
* Send reset without reusing existing buffer
+ *
+ * It extracts connection info out of original packet
*/
void
-tcp_send_reset (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4)
+tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4)
{
vlib_buffer_t *b;
u32 bi;
return;
b = vlib_get_buffer (vm, bi);
-
- /* Leave enough space for headers */
- vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
+ tcp_init_buffer (vm, b);
/* Make and write options */
tcp_hdr_len = sizeof (tcp_header_t);
else
{
int bogus = ~0;
- pkt_ih6 = (ip6_header_t *) (pkt_th - 1);
ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) ==
0x60);
- ih6 =
- vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
- &pkt_ih6->src_address, IP_PROTOCOL_TCP);
+ ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address,
+ &pkt_ih6->src_address, IP_PROTOCOL_TCP);
th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
ASSERT (!bogus);
}
- tcp_enqueue_to_ip_lookup (vm, b, bi, is_ip4);
+ tcp_enqueue_to_ip_lookup_now (vm, b, bi, is_ip4);
+ TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
+}
+
+/**
+ * Build and set reset packet for connection
+ */
+void
+tcp_send_reset (tcp_connection_t * tc)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ tcp_main_t *tm = vnet_get_tcp_main ();
+ vlib_buffer_t *b;
+ u32 bi;
+ tcp_header_t *th;
+ u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len;
+ u8 flags;
+
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
+ b = vlib_get_buffer (vm, bi);
+ tcp_init_buffer (vm, b);
+
+ tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
+ tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t);
+ advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED);
+ flags = TCP_FLAG_RST;
+ th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt,
+ tc->rcv_nxt, tcp_hdr_opts_len, flags,
+ advertise_wnd);
+ opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts);
+ ASSERT (opts_write_len == tc->snd_opts_len);
+ vnet_buffer (b)->tcp.connection_index = tc->c_c_index;
+ if (tc->c_is_ip4)
+ {
+ ip4_header_t *ih4;
+ ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4,
+ &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0);
+ th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4);
+ }
+ else
+ {
+ int bogus = ~0;
+ ip6_header_t *ih6;
+ ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6,
+ &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP);
+ th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus);
+ ASSERT (!bogus);
+ }
+ tcp_enqueue_to_ip_lookup_now (vm, b, bi, tc->c_is_ip4);
TCP_EVT_DBG (TCP_EVT_RST_SENT, tc);
}
u32 bi;
tcp_main_t *tm = vnet_get_tcp_main ();
vlib_main_t *vm = vlib_get_main ();
- u8 tcp_hdr_opts_len, tcp_opts_len;
- tcp_header_t *th;
- u32 time_now;
- u16 initial_wnd;
- tcp_options_t snd_opts;
if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
return;
b = vlib_get_buffer (vm, bi);
-
- /* Leave enough space for headers */
- vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
-
- /* Set random initial sequence */
- time_now = tcp_time_now ();
-
- tc->iss = random_u32 (&time_now);
- tc->snd_una = tc->iss;
- tc->snd_una_max = tc->snd_nxt = tc->iss + 1;
-
- initial_wnd = tcp_initial_window_to_advertise (tc);
-
- /* Make and write options */
- memset (&snd_opts, 0, sizeof (snd_opts));
- tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale);
- tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t);
-
- th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss,
- tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN,
- initial_wnd);
-
- tcp_options_write ((u8 *) (th + 1), &snd_opts);
+ tcp_init_buffer (vm, b);
+ tcp_make_syn (tc, b);
/* Measure RTT with this */
tc->rtt_ts = tcp_time_now ();
tc->rtt_seq = tc->snd_nxt;
-
- /* Start retransmit trimer */
- tcp_timer_set (tc, TCP_TIMER_RETRANSMIT_SYN, tc->rto * TCP_TO_TIMER_TICK);
tc->rto_boff = 0;
/* Set the connection establishment timer */
TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc);
}
-always_inline void
-tcp_enqueue_to_output_i (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
- u8 is_ip4, u8 flush)
-{
- tcp_main_t *tm = vnet_get_tcp_main ();
- u32 thread_index = vlib_get_thread_index ();
- u32 *to_next, next_index;
- vlib_frame_t *f;
-
- b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
- b->error = 0;
-
- /* Decide where to send the packet */
- next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index;
-
- /* Initialize the trajectory trace, if configured */
- if (VLIB_BUFFER_TRACE_TRAJECTORY > 0)
- {
- b->pre_data[0] = 1;
- b->pre_data[1] = next_index;
- }
-
- /* Get frame to v4/6 output node */
- f = tm->tx_frames[!is_ip4][thread_index];
- if (!f)
- {
- f = vlib_get_frame_to_node (vm, next_index);
- ASSERT (f);
- tm->tx_frames[!is_ip4][thread_index] = f;
- }
- to_next = vlib_frame_vector_args (f);
- to_next[f->n_vectors] = bi;
- f->n_vectors += 1;
- if (flush || f->n_vectors == VLIB_FRAME_SIZE)
- {
- vlib_put_frame_to_node (vm, next_index, f);
- tm->tx_frames[!is_ip4][thread_index] = 0;
- }
-}
-
-always_inline void
-tcp_enqueue_to_output (vlib_main_t * vm, vlib_buffer_t * b, u32 bi, u8 is_ip4)
-{
- tcp_enqueue_to_output_i (vm, b, bi, is_ip4, 0);
-}
-
-always_inline void
-tcp_enqueue_to_output_now (vlib_main_t * vm, vlib_buffer_t * b, u32 bi,
- u8 is_ip4)
-{
- tcp_enqueue_to_output_i (vm, b, bi, is_ip4, 1);
-}
-
/**
* Flush tx frame populated by retransmits and timer pops
*/
}
/**
- * Flush both v4 and v6 tx frames for thread index
+ * Flush ip lookup tx frames populated by timer pops
+ */
+always_inline void
+tcp_flush_frame_to_ip_lookup (vlib_main_t * vm, u8 thread_index, u8 is_ip4)
+{
+ if (tcp_main.ip_lookup_tx_frames[!is_ip4][thread_index])
+ {
+ u32 next_index;
+ next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index;
+ vlib_put_frame_to_node (vm, next_index,
+ tcp_main.ip_lookup_tx_frames[!is_ip4]
+ [thread_index]);
+ tcp_main.ip_lookup_tx_frames[!is_ip4][thread_index] = 0;
+ }
+}
+
+/**
+ * Flush v4 and v6 tcp and ip-lookup tx frames for thread index
*/
void
tcp_flush_frames_to_output (u8 thread_index)
vlib_main_t *vm = vlib_get_main ();
tcp_flush_frame_to_output (vm, thread_index, 1);
tcp_flush_frame_to_output (vm, thread_index, 0);
+ tcp_flush_frame_to_ip_lookup (vm, thread_index, 1);
+ tcp_flush_frame_to_ip_lookup (vm, thread_index, 0);
}
/**
void
tcp_send_fin (tcp_connection_t * tc)
{
- vlib_buffer_t *b;
- u32 bi;
tcp_main_t *tm = vnet_get_tcp_main ();
vlib_main_t *vm = vlib_get_main ();
+ vlib_buffer_t *b;
+ u32 bi;
+ u8 fin_snt = 0;
if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
return;
b = vlib_get_buffer (vm, bi);
-
+ fin_snt = tc->flags & TCP_CONN_FINSNT;
+ if (fin_snt)
+ tc->snd_nxt = tc->snd_una;
tcp_make_fin (tc, b);
tcp_enqueue_to_output_now (vm, b, bi, tc->c_is_ip4);
- tc->flags |= TCP_CONN_FINSNT;
- tc->flags &= ~TCP_CONN_FINPNDG;
+ if (!fin_snt)
+ {
+ tc->flags |= TCP_CONN_FINSNT;
+ tc->flags &= ~TCP_CONN_FINPNDG;
+ /* Account for the FIN */
+ tc->snd_una_max += 1;
+ tc->snd_nxt = tc->snd_una_max;
+ }
+ else
+ {
+ tc->snd_nxt = tc->snd_una_max;
+ }
tcp_retransmit_timer_force_update (tc);
TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
}
tcp_header_t *th;
data_len = b->current_length + b->total_length_not_including_first_buffer;
+ ASSERT (!b->total_length_not_including_first_buffer
+ || (b->flags & VLIB_BUFFER_NEXT_PRESENT));
vnet_buffer (b)->tcp.flags = 0;
if (compute_opts)
tcp_main_t *tm = vnet_get_tcp_main ();
vlib_main_t *vm = vlib_get_main ();
int n_bytes = 0;
- u32 start, bi, available_bytes;
+ u32 start, bi, available_bytes, seg_size;
+ u8 *data;
ASSERT (tc->state >= TCP_STATE_ESTABLISHED);
ASSERT (max_deq_bytes != 0);
/*
* Make sure we can retransmit something
*/
- max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
available_bytes = stream_session_tx_fifo_max_dequeue (&tc->connection);
+ ASSERT (available_bytes >= offset);
+ available_bytes -= offset;
if (!available_bytes)
return 0;
+ max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes);
max_deq_bytes = clib_min (available_bytes, max_deq_bytes);
- start = tc->snd_una + offset;
/* Start is beyond snd_congestion */
+ start = tc->snd_una + offset;
if (seq_geq (start, tc->snd_congestion))
- {
- goto done;
- }
+ goto done;
/* Don't overshoot snd_congestion */
if (seq_gt (start + max_deq_bytes, tc->snd_congestion))
{
max_deq_bytes = tc->snd_congestion - start;
if (max_deq_bytes == 0)
- {
- goto done;
- }
+ goto done;
}
+ seg_size = max_deq_bytes + MAX_HDRS_LEN;
+
/*
* Prepare options
*/
if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
return 0;
*b = vlib_get_buffer (vm, bi);
+ data = tcp_init_buffer (vm, *b);
/* Easy case, buffer size greater than mss */
- if (PREDICT_TRUE (max_deq_bytes <= tm->bytes_per_buffer))
+ if (PREDICT_TRUE (seg_size <= tm->bytes_per_buffer))
{
- n_bytes = stream_session_peek_bytes (&tc->connection,
- vlib_buffer_get_current (*b),
- offset, max_deq_bytes);
+ n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
+ max_deq_bytes);
ASSERT (n_bytes == max_deq_bytes);
b[0]->current_length = n_bytes;
tcp_push_hdr_i (tc, *b, tc->state, 0);
u32 thread_index = vlib_get_thread_index ();
u16 n_peeked, len_to_deq, available_bufs;
vlib_buffer_t *chain_b, *prev_b;
- u8 *data0;
int i;
- n_bufs_per_seg = ceil ((double) max_deq_bytes / tm->bytes_per_buffer);
- ASSERT (available_bytes >= max_deq_bytes);
+ n_bufs_per_seg = ceil ((double) seg_size / tm->bytes_per_buffer);
/* Make sure we have enough buffers */
available_bufs = vec_len (tm->tx_buffers[thread_index]);
VLIB_FRAME_SIZE - available_bufs))
{
tcp_return_buffer (tm);
+ *b = 0;
return 0;
}
}
- n_bytes = stream_session_peek_bytes (&tc->connection,
- vlib_buffer_get_current (*b),
- offset, tm->bytes_per_buffer);
+ n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
+ tm->bytes_per_buffer -
+ MAX_HDRS_LEN);
b[0]->current_length = n_bytes;
b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
b[0]->total_length_not_including_first_buffer = 0;
-
- tcp_push_hdr_i (tc, *b, tc->state, 0);
max_deq_bytes -= n_bytes;
chain_b = *b;
ASSERT (chain_bi != (u32) ~ 0);
chain_b = vlib_get_buffer (vm, chain_bi);
chain_b->current_data = 0;
- data0 = vlib_buffer_get_current (chain_b);
- n_peeked = stream_session_peek_bytes (&tc->connection, data0,
- n_bytes, len_to_deq);
- n_bytes += n_peeked;
+ data = vlib_buffer_get_current (chain_b);
+ n_peeked = stream_session_peek_bytes (&tc->connection, data,
+ offset + n_bytes, len_to_deq);
ASSERT (n_peeked == len_to_deq);
+ n_bytes += n_peeked;
chain_b->current_length = n_peeked;
- b[0]->total_length_not_including_first_buffer +=
- chain_b->current_length;
+ chain_b->flags &= VLIB_BUFFER_FREE_LIST_INDEX_MASK;
+ chain_b->next_buffer = 0;
/* update previous buffer */
prev_b->next_buffer = chain_bi;
prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
- /* update current buffer */
- chain_b->next_buffer = 0;
-
max_deq_bytes -= n_peeked;
+ b[0]->total_length_not_including_first_buffer += n_peeked;
}
+
+ tcp_push_hdr_i (tc, *b, tc->state, 0);
}
ASSERT (n_bytes > 0);
+ ASSERT (((*b)->current_data + (*b)->current_length) <=
+ tm->bytes_per_buffer);
if (tcp_in_fastrecovery (tc))
tc->snd_rxt_bytes += n_bytes;
tc->ssthresh = clib_max (tcp_flight_size (tc) / 2, 2 * tc->snd_mss);
tc->cwnd = tcp_loss_wnd (tc);
tc->snd_congestion = tc->snd_una_max;
-
+ tc->rtt_ts = 0;
tcp_recovery_on (tc);
}
if (is_syn)
{
tc = tcp_half_open_connection_get (index);
+ /* Note: the connection may have transitioned to ESTABLISHED... */
+ if (PREDICT_FALSE (tc == 0))
+ return;
tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
}
else
{
tc = tcp_connection_get (index, thread_index);
+ /* Note: the connection may have been closed and pool_put */
+ if (PREDICT_FALSE (tc == 0))
+ return;
tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
}
- if (!tcp_in_recovery (tc) && tc->rto_boff > 0
- && tc->state >= TCP_STATE_ESTABLISHED)
- {
- tc->rto_boff = 0;
- tcp_update_rto (tc);
- }
-
- /* Increment RTO backoff (also equal to number of retries) */
- tc->rto_boff += 1;
-
- /* Go back to first un-acked byte */
- tc->snd_nxt = tc->snd_una;
-
if (tc->state >= TCP_STATE_ESTABLISHED)
{
/* Lost FIN, retransmit and return */
return;
}
+ /* Shouldn't be here */
+ if (tc->snd_una == tc->snd_una_max)
+ {
+ tcp_recovery_off (tc);
+ return;
+ }
+
+ /* We're not in recovery so make sure rto_boff is 0 */
+ if (!tcp_in_recovery (tc) && tc->rto_boff > 0)
+ {
+ tc->rto_boff = 0;
+ tcp_update_rto (tc);
+ }
+
+ /* Increment RTO backoff (also equal to number of retries) and go back
+ * to first un-acked byte */
+ tc->rto_boff += 1;
+
/* First retransmit timeout */
if (tc->rto_boff == 1)
tcp_rtx_timeout_cc (tc);
- /* Exponential backoff */
+ tc->snd_nxt = tc->snd_una;
tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
- /* Send one segment */
+ /* Send one segment. Note that n_bytes may be zero due to buffer shortfall */
n_bytes = tcp_prepare_retransmit_segment (tc, 0, tc->snd_mss, &b);
- ASSERT (n_bytes);
- bi = vlib_get_buffer_index (vm, b);
+
/* TODO be less aggressive about this */
scoreboard_clear (&tc->sack_sb);
if (n_bytes == 0)
{
- clib_warning ("could not retransmit anything");
- clib_warning ("%U", format_tcp_connection, tc, 2);
-
+ ASSERT (!b);
+ if (tc->snd_una == tc->snd_una_max)
+ return;
+ ASSERT (tc->rto_boff > 1 && tc->snd_una == tc->snd_congestion);
+ clib_warning ("retransmit fail: %U", format_tcp_connection, tc, 2);
/* Try again eventually */
tcp_retransmit_timer_set (tc);
- ASSERT (0 || (tc->rto_boff > 1
- && tc->snd_una == tc->snd_congestion));
return;
}
+ bi = vlib_get_buffer_index (vm, b);
+
/* For first retransmit, record timestamp (Eifel detection RFC3522) */
if (tc->rto_boff == 1)
tc->snd_rxt_ts = tcp_time_now ();
+
+ tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
+ tcp_retransmit_timer_update (tc);
}
- /* Retransmit for SYN/SYNACK */
- else if (tc->state == TCP_STATE_SYN_RCVD || tc->state == TCP_STATE_SYN_SENT)
+ /* Retransmit for SYN */
+ else if (tc->state == TCP_STATE_SYN_SENT)
{
/* Half-open connection actually moved to established but we were
* waiting for syn retransmit to pop to call cleanup from the right
* thread. */
if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
{
- ASSERT (tc->state == TCP_STATE_SYN_SENT);
if (tcp_half_open_connection_cleanup (tc))
{
clib_warning ("could not remove half-open connection");
/* Try without increasing RTO a number of times. If this fails,
* start growing RTO exponentially */
+ tc->rto_boff += 1;
if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
return;
+
b = vlib_get_buffer (vm, bi);
- vlib_buffer_make_headroom (b, MAX_HDRS_LEN);
- tcp_push_hdr_i (tc, b, tc->state, 1);
+ tcp_init_buffer (vm, b);
+ tcp_make_syn (tc, b);
- /* Account for the SYN */
- tc->snd_nxt += 1;
tc->rtt_ts = 0;
- TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc,
- (tc->state == TCP_STATE_SYN_SENT ? 0 : 1));
+ TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0);
+
+ /* This goes straight to ipx_lookup. Retransmit timer set already */
+ tcp_push_ip_hdr (tm, tc, b);
+ tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4);
}
- else
+ /* Retransmit SYN-ACK */
+ else if (tc->state == TCP_STATE_SYN_RCVD)
{
- ASSERT (tc->state == TCP_STATE_CLOSED);
- clib_warning ("connection closed ...");
- return;
- }
+ tc->rto_boff += 1;
+ if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
+ tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
+ tc->rtt_ts = 0;
- if (!is_syn)
- {
- tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
+ if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
+ return;
- /* Re-enable retransmit timer */
- tcp_retransmit_timer_set (tc);
+ b = vlib_get_buffer (vm, bi);
+ tcp_make_synack (tc, b);
+ TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1);
+
+ /* Retransmit timer already updated, just enqueue to output */
+ tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
}
else
{
- ASSERT (tc->state == TCP_STATE_SYN_SENT);
-
- /* This goes straight to ipx_lookup */
- tcp_push_ip_hdr (tm, tc, b);
- tcp_enqueue_to_ip_lookup (vm, b, bi, tc->c_is_ip4);
-
- /* Re-enable retransmit timer */
- tcp_timer_set (tc, TCP_TIMER_RETRANSMIT_SYN,
- tc->rto * TCP_TO_TIMER_TICK);
+ ASSERT (tc->state == TCP_STATE_CLOSED);
+ if (CLIB_DEBUG)
+ TCP_DBG ("connection state: %U", format_tcp_connection, tc, 2);
+ return;
}
}
u32 thread_index = vlib_get_thread_index ();
tcp_connection_t *tc;
vlib_buffer_t *b;
- u32 bi, old_snd_nxt, snd_bytes = 0, available_bytes = 0;
+ u32 bi, max_snd_bytes, available_bytes, offset;
int n_bytes = 0;
+ u8 *data;
tc = tcp_connection_get_if_valid (index, thread_index);
tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
/* Problem already solved or worse */
- available_bytes = stream_session_tx_fifo_max_dequeue (&tc->connection);
if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
- || tc->snd_wnd > tc->snd_mss || tcp_in_recovery (tc)
- || !available_bytes)
+ || tc->snd_wnd > tc->snd_mss || tcp_in_recovery (tc))
return;
+ available_bytes = stream_session_tx_fifo_max_dequeue (&tc->connection);
+ offset = tc->snd_una_max - tc->snd_una;
+
+ /* Reprogram persist if no new bytes available to send. We may have data
+ * next time */
+ if (!available_bytes)
+ {
+ tcp_persist_timer_set (tc);
+ return;
+ }
+
+ if (available_bytes <= offset)
+ {
+ ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
+ return;
+ }
+
/* Increment RTO backoff */
tc->rto_boff += 1;
tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
return;
b = vlib_get_buffer (vm, bi);
+ data = tcp_init_buffer (vm, b);
- tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
+ tcp_validate_txf_size (tc, offset);
tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state);
- snd_bytes = clib_min (tc->snd_mss, tm->bytes_per_buffer);
- n_bytes = stream_session_peek_bytes (&tc->connection,
- vlib_buffer_get_current (b),
- tc->snd_una_max - tc->snd_una,
- snd_bytes);
- ASSERT (n_bytes != 0);
+ max_snd_bytes = clib_min (tc->snd_mss, tm->bytes_per_buffer - MAX_HDRS_LEN);
+ n_bytes = stream_session_peek_bytes (&tc->connection, data, offset,
+ max_snd_bytes);
b->current_length = n_bytes;
- ASSERT (tc->snd_nxt == tc->snd_una_max || tc->rto_boff > 1
- || tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
+ ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)
+ || tc->snd_nxt == tc->snd_una_max
+ || tc->rto_boff > 1));
- /* Allow updating of snd_una_max but don't update snd_nxt */
- old_snd_nxt = tc->snd_nxt;
tcp_push_hdr_i (tc, b, tc->state, 0);
- tc->snd_nxt = old_snd_nxt;
tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
- /* Re-enable persist timer */
- tcp_persist_timer_set (tc);
+ /* Just sent new data, enable retransmit */
+ tcp_retransmit_timer_update (tc);
}
/**
tcp_fast_retransmit_sack (tcp_connection_t * tc)
{
vlib_main_t *vm = vlib_get_main ();
- u32 n_written = 0, offset = 0, max_bytes;
+ u32 n_written = 0, offset, max_bytes;
vlib_buffer_t *b = 0;
sack_scoreboard_hole_t *hole;
sack_scoreboard_t *sb;
* unSACKed sequence number SHOULD be returned, and RescueRxt set to
* RecoveryPoint. HighRxt MUST NOT be updated.
*/
- max_bytes = clib_min (tc->snd_mss, snd_space);
+ max_bytes = clib_min (tc->snd_mss,
+ tc->snd_congestion - tc->snd_una);
+ max_bytes = clib_min (max_bytes, snd_space);
offset = tc->snd_congestion - tc->snd_una - max_bytes;
sb->rescue_rxt = tc->snd_congestion;
tc->snd_nxt = tc->snd_una + offset;
break;
}
- max_bytes = snd_limited ? tc->snd_mss : hole->end - sb->high_rxt;
+ max_bytes = clib_min (hole->end - sb->high_rxt, snd_space);
+ max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes;
+ if (max_bytes == 0)
+ break;
offset = sb->high_rxt - tc->snd_una;
- tc->snd_nxt = tc->snd_una + offset;
+ tc->snd_nxt = sb->high_rxt;
n_written = tcp_prepare_retransmit_segment (tc, offset, max_bytes, &b);
/* Nothing left to retransmit */
bi = vlib_get_buffer_index (vm, b);
sb->high_rxt += n_written;
tcp_enqueue_to_output (vm, b, bi, tc->c_is_ip4);
+ ASSERT (n_written <= snd_space);
snd_space -= n_written;
}
always_inline u32
tcp_session_has_ooo_data (tcp_connection_t * tc)
{
- stream_session_t *s =
- stream_session_get (tc->c_s_index, tc->c_thread_index);
+ stream_session_t *s = session_get (tc->c_s_index, tc->c_thread_index);
return svm_fifo_has_ooo_data (s->server_rx_fifo);
}
tc = (tcp_connection_t *) tconn;
tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, 0);
+ ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
{
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