tcp: retransmit and multi-buffer segment fixes and improvements
- set session state as closed on session manager delete
- enable retransmit as opposed to persist timer after persist timer completes
- properly discard buffer chain bytes when new data overlaps ooo
segments
- don't use rxt bytes in snd space estimate used on tx path
Change-Id: Id9cab686e532e5fe70c775d5440260e8eb890a9f
Signed-off-by: Florin Coras <fcoras@cisco.com>
diff --git a/src/svm/svm_fifo.c b/src/svm/svm_fifo.c
index 7f8127c..8fe82f5 100644
--- a/src/svm/svm_fifo.c
+++ b/src/svm/svm_fifo.c
@@ -53,10 +53,12 @@
u8 *
format_ooo_segment (u8 * s, va_list * args)
{
+ svm_fifo_t *f = va_arg (*args, svm_fifo_t *);
ooo_segment_t *seg = va_arg (*args, ooo_segment_t *);
-
- s = format (s, "pos %u, len %u, next %d, prev %d",
- seg->start, seg->length, seg->next, seg->prev);
+ u32 normalized_start = (seg->start + f->nitems - f->tail) % f->nitems;
+ s = format (s, "[%u, %u], len %u, next %d, prev %d", normalized_start,
+ (normalized_start + seg->length) % f->nitems, seg->length,
+ seg->next, seg->prev);
return s;
}
@@ -154,7 +156,7 @@
while (ooo_segment_index != OOO_SEGMENT_INVALID_INDEX)
{
seg = pool_elt_at_index (f->ooo_segments, ooo_segment_index);
- s = format (s, " %U\n", format_ooo_segment, seg);
+ s = format (s, " %U\n", format_ooo_segment, f, seg);
ooo_segment_index = seg->next;
}
@@ -557,7 +559,6 @@
{
u32 total_copy_bytes, first_copy_bytes, second_copy_bytes;
u32 cursize, nitems, normalized_offset;
- u32 offset_from_tail;
f->ooos_newest = OOO_SEGMENT_INVALID_INDEX;
@@ -570,8 +571,7 @@
normalized_offset = (f->tail + offset) % nitems;
/* Will this request fit? */
- offset_from_tail = (nitems + normalized_offset - f->tail) % nitems;
- if ((required_bytes + offset_from_tail) > (nitems - cursize))
+ if ((required_bytes + offset) > (nitems - cursize))
return -1;
svm_fifo_trace_add (f, offset, required_bytes, 1);
diff --git a/src/vnet/session/segment_manager.c b/src/vnet/session/segment_manager.c
index 262b7fa..4397706 100644
--- a/src/vnet/session/segment_manager.c
+++ b/src/vnet/session/segment_manager.c
@@ -224,6 +224,7 @@
session = stream_session_get (session_index, thread_index);
/* Instead of directly removing the session call disconnect */
+ session->session_state = SESSION_STATE_CLOSED;
session_send_session_evt_to_thread (stream_session_handle (session),
FIFO_EVENT_DISCONNECT,
thread_index);
diff --git a/src/vnet/session/session.c b/src/vnet/session/session.c
index 70a5cd8..6fe9904 100644
--- a/src/vnet/session/session.c
+++ b/src/vnet/session/session.c
@@ -92,38 +92,104 @@
return 0;
}
-/** Enqueue buffer chain tail */
+/**
+ * Discards bytes from buffer chain
+ *
+ * It discards n_bytes_to_drop starting at first buffer after chain_b
+ */
+always_inline void
+session_enqueue_discard_chain_bytes (vlib_main_t * vm, vlib_buffer_t * b,
+ vlib_buffer_t ** chain_b,
+ u32 n_bytes_to_drop)
+{
+ vlib_buffer_t *next = *chain_b;
+ u32 to_drop = n_bytes_to_drop;
+ ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT);
+ while (to_drop && (next->flags & VLIB_BUFFER_NEXT_PRESENT))
+ {
+ next = vlib_get_buffer (vm, next->next_buffer);
+ if (next->current_length > to_drop)
+ {
+ vlib_buffer_advance (next, to_drop);
+ to_drop = 0;
+ }
+ else
+ {
+ to_drop -= next->current_length;
+ next->current_length = 0;
+ }
+ }
+ *chain_b = next;
+
+ if (to_drop == 0)
+ b->total_length_not_including_first_buffer -= n_bytes_to_drop;
+}
+
+/**
+ * Enqueue buffer chain tail
+ */
always_inline int
session_enqueue_chain_tail (stream_session_t * s, vlib_buffer_t * b,
u32 offset, u8 is_in_order)
{
vlib_buffer_t *chain_b;
- u32 chain_bi = b->next_buffer, len;
+ u32 chain_bi, len, diff;
vlib_main_t *vm = vlib_get_main ();
u8 *data;
- u16 written = 0;
+ u32 written = 0;
int rv = 0;
+ if (is_in_order && offset)
+ {
+ diff = offset - b->current_length;
+ if (diff > b->total_length_not_including_first_buffer)
+ return 0;
+ chain_b = b;
+ session_enqueue_discard_chain_bytes (vm, b, &chain_b, diff);
+ chain_bi = vlib_get_buffer_index (vm, chain_b);
+ }
+ else
+ chain_bi = b->next_buffer;
+
do
{
chain_b = vlib_get_buffer (vm, chain_bi);
data = vlib_buffer_get_current (chain_b);
len = chain_b->current_length;
+ if (!len)
+ continue;
if (is_in_order)
{
rv = svm_fifo_enqueue_nowait (s->server_rx_fifo, len, data);
- if (rv < len)
+ if (rv == len)
+ {
+ written += rv;
+ }
+ else if (rv < len)
{
return (rv > 0) ? (written + rv) : written;
}
- written += rv;
+ else if (rv > len)
+ {
+ written += rv;
+
+ /* written more than what was left in chain */
+ if (written > b->total_length_not_including_first_buffer)
+ return written;
+
+ /* drop the bytes that have already been delivered */
+ session_enqueue_discard_chain_bytes (vm, b, &chain_b, rv - len);
+ }
}
else
{
rv = svm_fifo_enqueue_with_offset (s->server_rx_fifo, offset, len,
data);
if (rv)
- return -1;
+ {
+ clib_warning ("failed to enqueue multi-buffer seg");
+ return -1;
+ }
offset += len;
}
}
@@ -155,22 +221,22 @@
u32 offset, u8 queue_event, u8 is_in_order)
{
stream_session_t *s;
- int enqueued = 0, rv;
+ int enqueued = 0, rv, in_order_off;
s = stream_session_get (tc->s_index, tc->thread_index);
if (is_in_order)
{
- enqueued =
- svm_fifo_enqueue_nowait (s->server_rx_fifo, b->current_length,
- vlib_buffer_get_current (b));
- if (PREDICT_FALSE
- ((b->flags & VLIB_BUFFER_NEXT_PRESENT) && enqueued > 0))
+ enqueued = svm_fifo_enqueue_nowait (s->server_rx_fifo,
+ b->current_length,
+ vlib_buffer_get_current (b));
+ if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT)
+ && enqueued >= 0))
{
- rv = session_enqueue_chain_tail (s, b, 0, 1);
- if (rv <= 0)
- return enqueued;
- enqueued += rv;
+ in_order_off = enqueued > b->current_length ? enqueued : 0;
+ rv = session_enqueue_chain_tail (s, b, in_order_off, 1);
+ if (rv > 0)
+ enqueued += rv;
}
}
else
@@ -179,9 +245,10 @@
b->current_length,
vlib_buffer_get_current (b));
if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) && !rv))
- rv = session_enqueue_chain_tail (s, b, offset + b->current_length, 0);
- if (rv)
- return -1;
+ session_enqueue_chain_tail (s, b, offset + b->current_length, 0);
+ /* if something was enqueued, report even this as success for ooo
+ * segment handling */
+ return rv;
}
if (queue_event)
diff --git a/src/vnet/session/session_node.c b/src/vnet/session/session_node.c
index fac2b85..cd52742 100644
--- a/src/vnet/session/session_node.c
+++ b/src/vnet/session/session_node.c
@@ -76,7 +76,7 @@
u8 thread_index, svm_fifo_t * fifo,
vlib_buffer_t * b0, u32 bi0, u8 n_bufs_per_seg,
u32 left_from_seg, u32 * left_to_snd0,
- u16 * n_bufs, u32 * rx_offset, u16 deq_per_buf,
+ u16 * n_bufs, u32 * tx_offset, u16 deq_per_buf,
u8 peek_data)
{
vlib_buffer_t *chain_b0, *prev_b0;
@@ -104,8 +104,8 @@
data0 = vlib_buffer_get_current (chain_b0);
if (peek_data)
{
- n_bytes_read = svm_fifo_peek (fifo, *rx_offset, len_to_deq0, data0);
- *rx_offset += n_bytes_read;
+ n_bytes_read = svm_fifo_peek (fifo, *tx_offset, len_to_deq0, data0);
+ *tx_offset += n_bytes_read;
}
else
{
@@ -126,7 +126,8 @@
if (to_deq == 0)
break;
}
- ASSERT (to_deq == 0);
+ ASSERT (to_deq == 0
+ && b0->total_length_not_including_first_buffer == left_from_seg);
*left_to_snd0 -= left_from_seg;
}
@@ -144,7 +145,7 @@
transport_proto_vft_t *transport_vft;
u32 next_index, next0, *to_next, n_left_to_next, bi0;
vlib_buffer_t *b0;
- u32 rx_offset = 0, max_dequeue0, n_bytes_per_seg;
+ u32 tx_offset = 0, max_dequeue0, n_bytes_per_seg, left_for_seg;
u16 snd_mss0, n_bufs_per_seg, n_bufs;
u8 *data0;
int i, n_bytes_read;
@@ -170,11 +171,11 @@
if (peek_data)
{
/* Offset in rx fifo from where to peek data */
- rx_offset = transport_vft->tx_fifo_offset (tc0);
+ tx_offset = transport_vft->tx_fifo_offset (tc0);
}
/* Check how much we can pull. If buffering, subtract the offset */
- max_dequeue0 = svm_fifo_max_dequeue (s0->server_tx_fifo) - rx_offset;
+ max_dequeue0 = svm_fifo_max_dequeue (s0->server_tx_fifo) - tx_offset;
/* Nothing to read return */
if (max_dequeue0 == 0)
@@ -193,6 +194,7 @@
}
else
{
+ /* Expectation is that snd_space0 is already a multiple of snd_mss */
max_len_to_snd0 = snd_space0;
}
@@ -265,8 +267,7 @@
b0 = vlib_get_buffer (vm, bi0);
b0->error = 0;
- b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID
- | VNET_BUFFER_F_LOCALLY_ORIGINATED;
+ b0->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED;
b0->current_data = 0;
b0->total_length_not_including_first_buffer = 0;
@@ -274,11 +275,11 @@
data0 = vlib_buffer_make_headroom (b0, MAX_HDRS_LEN);
if (peek_data)
{
- n_bytes_read = svm_fifo_peek (s0->server_tx_fifo, rx_offset,
+ n_bytes_read = svm_fifo_peek (s0->server_tx_fifo, tx_offset,
len_to_deq0, data0);
/* Keep track of progress locally, transport is also supposed to
* increment it independently when pushing the header */
- rx_offset += n_bytes_read;
+ tx_offset += n_bytes_read;
}
else
{
@@ -299,12 +300,11 @@
*/
if (PREDICT_FALSE (n_bufs_per_seg > 1 && left_to_snd0))
{
- u32 left_for_seg;
left_for_seg = clib_min (snd_mss0 - n_bytes_read, left_to_snd0);
session_tx_fifo_chain_tail (smm, vm, thread_index,
s0->server_tx_fifo, b0, bi0,
n_bufs_per_seg, left_for_seg,
- &left_to_snd0, &n_bufs, &rx_offset,
+ &left_to_snd0, &n_bufs, &tx_offset,
deq_per_buf, peek_data);
}
diff --git a/src/vnet/session/stream_session.h b/src/vnet/session/stream_session.h
index 533cf97..275052d 100644
--- a/src/vnet/session/stream_session.h
+++ b/src/vnet/session/stream_session.h
@@ -56,7 +56,7 @@
u8 session_type;
/** State */
- u8 session_state;
+ volatile u8 session_state;
u8 thread_index;
diff --git a/src/vnet/tcp/tcp.c b/src/vnet/tcp/tcp.c
index 6edf52a..197fff9 100644
--- a/src/vnet/tcp/tcp.c
+++ b/src/vnet/tcp/tcp.c
@@ -798,7 +798,8 @@
s = format (s, "rtt_seq %u\n", tc->rtt_seq);
s = format (s, " tsval_recent %u tsval_recent_age %u\n", tc->tsval_recent,
tcp_time_now () - tc->tsval_recent_age);
- s = format (s, " scoreboard: %U\n", format_tcp_scoreboard, &tc->sack_sb);
+ s = format (s, " scoreboard: %U\n", format_tcp_scoreboard, &tc->sack_sb,
+ tc);
if (vec_len (tc->snd_sacks))
s = format (s, " sacks tx: %U\n", format_tcp_sacks, tc);
@@ -858,7 +859,7 @@
if (tc)
s = format (s, "%U", format_tcp_connection, tc, verbose);
else
- s = format (s, "empty");
+ s = format (s, "empty\n");
return s;
}
@@ -930,7 +931,11 @@
format_tcp_sack_hole (u8 * s, va_list * args)
{
sack_scoreboard_hole_t *hole = va_arg (*args, sack_scoreboard_hole_t *);
- s = format (s, "[%u, %u]", hole->start, hole->end);
+ tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
+ if (tc)
+ s = format (s, " [%u, %u]", hole->start - tc->iss, hole->end - tc->iss);
+ else
+ s = format (s, " [%u, %u]", hole->start, hole->end);
return s;
}
@@ -938,6 +943,7 @@
format_tcp_scoreboard (u8 * s, va_list * args)
{
sack_scoreboard_t *sb = va_arg (*args, sack_scoreboard_t *);
+ tcp_connection_t *tc = va_arg (*args, tcp_connection_t *);
sack_scoreboard_hole_t *hole;
s = format (s, "sacked_bytes %u last_sacked_bytes %u lost_bytes %u\n",
sb->sacked_bytes, sb->last_sacked_bytes, sb->lost_bytes);
@@ -952,7 +958,7 @@
while (hole)
{
- s = format (s, "%U", format_tcp_sack_hole, hole);
+ s = format (s, "%U", format_tcp_sack_hole, hole, tc);
hole = scoreboard_next_hole (sb, hole);
}
@@ -1001,13 +1007,10 @@
return tc->snd_wnd <= snd_space ? tc->snd_wnd : 0;
}
- /* If we can't write at least a segment, don't try at all */
+ /* If not snd_wnd constrained and we can't write at least a segment,
+ * don't try at all */
if (PREDICT_FALSE (snd_space < tc->snd_mss))
- {
- if (snd_space > clib_min (tc->mss, tc->rcv_opts.mss) - TCP_HDR_LEN_MAX)
- return snd_space;
- return 0;
- }
+ return 0;
/* round down to mss multiple */
return snd_space - (snd_space % tc->snd_mss);
@@ -1030,7 +1033,7 @@
if (PREDICT_TRUE (tcp_in_cong_recovery (tc) == 0))
{
- snd_space = tcp_available_snd_space (tc);
+ snd_space = tcp_available_output_snd_space (tc);
/* If we haven't gotten dupacks or if we did and have gotten sacked
* bytes then we can still send as per Limited Transmit (RFC3042) */
@@ -1051,17 +1054,20 @@
if (tcp_in_recovery (tc))
{
tc->snd_nxt = tc->snd_una_max;
- snd_space = tcp_available_wnd (tc) - tc->snd_rxt_bytes
+ snd_space = tcp_available_snd_wnd (tc) - tc->snd_rxt_bytes
- (tc->snd_una_max - tc->snd_congestion);
if (snd_space <= 0 || (tc->snd_una_max - tc->snd_una) >= tc->snd_wnd)
return 0;
return tcp_round_snd_space (tc, snd_space);
}
- /* If in fast recovery, send 1 SMSS if wnd allows */
- if (tcp_in_fastrecovery (tc)
- && tcp_available_snd_space (tc) && !tcp_fastrecovery_sent_1_smss (tc))
+ /* RFC 5681: When previously unsent data is available and the new value of
+ * cwnd and the receiver's advertised window allow, a TCP SHOULD send 1*SMSS
+ * bytes of previously unsent data. */
+ if (tcp_in_fastrecovery (tc) && !tcp_fastrecovery_sent_1_smss (tc))
{
+ if (tcp_available_output_snd_space (tc) < tc->snd_mss)
+ return 0;
tcp_fastrecovery_1_smss_on (tc);
return tc->snd_mss;
}
@@ -1073,7 +1079,8 @@
tcp_session_send_space (transport_connection_t * trans_conn)
{
tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
- return tcp_snd_space (tc);
+ return clib_min (tcp_snd_space (tc),
+ tc->snd_wnd - (tc->snd_nxt - tc->snd_una));
}
i32
diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h
index 097cc8c..9e4660b 100644
--- a/src/vnet/tcp/tcp.h
+++ b/src/vnet/tcp/tcp.h
@@ -498,7 +498,9 @@
void tcp_make_ack (tcp_connection_t * ts, vlib_buffer_t * b);
void tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b);
void tcp_make_synack (tcp_connection_t * ts, vlib_buffer_t * b);
-void tcp_send_reset (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4);
+void tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
+ u8 is_ip4);
+void tcp_send_reset (tcp_connection_t * tc);
void tcp_send_syn (tcp_connection_t * tc);
void tcp_send_fin (tcp_connection_t * tc);
void tcp_init_mss (tcp_connection_t * tc);
@@ -582,15 +584,30 @@
}
always_inline u32
-tcp_available_wnd (const tcp_connection_t * tc)
+tcp_available_snd_wnd (const tcp_connection_t * tc)
{
return clib_min (tc->cwnd, tc->snd_wnd);
}
always_inline u32
+tcp_available_output_snd_space (const tcp_connection_t * tc)
+{
+ u32 available_wnd = tcp_available_snd_wnd (tc);
+ int flight_size = (int) (tc->snd_nxt - tc->snd_una);
+
+ if (available_wnd <= flight_size)
+ return 0;
+
+ return available_wnd - flight_size;
+}
+
+/**
+ * Estimate of how many bytes we can still push into the network
+ */
+always_inline u32
tcp_available_snd_space (const tcp_connection_t * tc)
{
- u32 available_wnd = tcp_available_wnd (tc);
+ u32 available_wnd = tcp_available_snd_wnd (tc);
u32 flight_size = tcp_flight_size (tc);
if (available_wnd <= flight_size)
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index 6f9e4c7..95f9ade 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -1363,7 +1363,7 @@
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));
@@ -1381,12 +1381,12 @@
/* 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;
@@ -1400,7 +1400,7 @@
* not be enqueued. Inform peer */
tc->flags |= TCP_CONN_SNDACK;
- return TCP_ERROR_PARTIALLY_ENQUEUED;
+ error = TCP_ERROR_PARTIALLY_ENQUEUED;
}
else
{
@@ -1415,7 +1415,7 @@
tcp_update_sack_list (tc, tc->rcv_nxt, tc->rcv_nxt);
}
- return TCP_ERROR_ENQUEUED;
+ return error;
}
/** Enqueue out-of-order data */
@@ -1495,10 +1495,10 @@
static int
tcp_buffer_discard_bytes (vlib_buffer_t * b, u32 n_bytes_to_drop)
{
- u32 discard;
+ u32 discard, first = b->current_length;
vlib_main_t *vm = vlib_get_main ();
- /* Handle multi segment packets */
+ /* Handle multi-buffer segments */
if (n_bytes_to_drop > b->current_length)
{
if (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))
@@ -1511,7 +1511,12 @@
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;
}
@@ -1908,7 +1913,7 @@
if (ack0 <= tc0->iss || ack0 > tc0->snd_nxt)
{
if (!tcp_rst (tcp0))
- tcp_send_reset (tc0, b0, is_ip4);
+ tcp_send_reset_w_pkt (tc0, b0, is_ip4);
goto drop;
}
@@ -1995,7 +2000,7 @@
* allocate session send reset */
if (stream_session_connect_notify (&new_tc0->connection, 0))
{
- tcp_send_reset (new_tc0, b0, is_ip4);
+ tcp_send_reset_w_pkt (new_tc0, b0, is_ip4);
tcp_connection_cleanup (new_tc0);
goto drop;
}
@@ -2017,7 +2022,7 @@
if (stream_session_connect_notify (&new_tc0->connection, 0))
{
tcp_connection_cleanup (new_tc0);
- tcp_send_reset (tc0, b0, is_ip4);
+ tcp_send_reset_w_pkt (tc0, b0, is_ip4);
TCP_EVT_DBG (TCP_EVT_RST_SENT, tc0);
goto drop;
}
@@ -2221,7 +2226,7 @@
*/
if (!tcp_rcv_ack_is_acceptable (tc0, b0))
{
- tcp_send_reset (tc0, b0, is_ip4);
+ tcp_send_reset_w_pkt (tc0, b0, is_ip4);
goto drop;
}
diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index 7da0c07..c56eadf 100644
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -440,7 +440,8 @@
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_validate (tm->tx_buffers[thread_index],
+ vec_len (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],
@@ -480,27 +481,31 @@
_vec_len (my_tx_buffers) += 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;
+ b->flags = 0;
+ 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 = 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);
}
/**
@@ -632,6 +637,59 @@
vlib_put_frame_to_node (vm, next_index, f);
}
+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);
+}
+
int
tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0,
tcp_state_t state, u8 thread_index, u8 is_ip4)
@@ -712,9 +770,11 @@
/**
* 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;
@@ -730,9 +790,7 @@
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);
@@ -787,6 +845,38 @@
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;
+ tcp_enqueue_to_output_now (vm, b, bi, tc->c_is_ip4);
+}
+
void
tcp_push_ip_hdr (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b)
{
@@ -835,9 +925,7 @@
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);
/* Set random initial sequence */
time_now = tcp_time_now ();
@@ -875,59 +963,6 @@
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
*/
@@ -969,7 +1004,7 @@
if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
return;
b = vlib_get_buffer (vm, bi);
-
+ /* buffer will be initialized by in tcp_make_fin */
tcp_make_fin (tc, b);
tcp_enqueue_to_output_now (vm, b, bi, tc->c_is_ip4);
tc->flags |= TCP_CONN_FINSNT;
@@ -1013,6 +1048,8 @@
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)
@@ -1106,29 +1143,27 @@
* Make sure we can retransmit something
*/
available_bytes = stream_session_tx_fifo_max_dequeue (&tc->connection);
+ 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);
- seg_size = max_deq_bytes + MAX_HDRS_LEN;
/* 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
*/
@@ -1141,7 +1176,7 @@
if (PREDICT_FALSE (tcp_get_free_buffer_index (tm, &bi)))
return 0;
*b = vlib_get_buffer (vm, bi);
- data = vlib_buffer_make_headroom (*b, MAX_HDRS_LEN);
+ data = tcp_init_buffer (vm, *b);
/* Easy case, buffer size greater than mss */
if (PREDICT_TRUE (seg_size <= tm->bytes_per_buffer))
@@ -1162,7 +1197,6 @@
int i;
n_bufs_per_seg = ceil ((double) seg_size / tm->bytes_per_buffer);
- ASSERT (available_bytes >= max_deq_bytes);
/* Make sure we have enough buffers */
available_bufs = vec_len (tm->tx_buffers[thread_index]);
@@ -1182,8 +1216,6 @@
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;
@@ -1197,22 +1229,22 @@
chain_b->current_data = 0;
data = vlib_buffer_get_current (chain_b);
n_peeked = stream_session_peek_bytes (&tc->connection, data,
- n_bytes, len_to_deq);
- n_bytes += n_peeked;
+ 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 = 0;
+ 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);
@@ -1348,7 +1380,7 @@
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_init_buffer (vm, b);
tcp_push_hdr_i (tc, b, tc->state, 1);
/* Account for the SYN */
@@ -1409,8 +1441,9 @@
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, old_snd_nxt, max_snd_bytes, available_bytes, offset;
int n_bytes = 0;
+ u8 *data;
tc = tcp_connection_get_if_valid (index, thread_index);
@@ -1419,12 +1452,13 @@
/* Make sure timer handle is set to invalid */
tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
+ offset = tc->snd_una_max - tc->snd_una;
/* 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)
+ || !available_bytes || available_bytes <= offset)
return;
/* Increment RTO backoff */
@@ -1437,18 +1471,17 @@
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 && (tc->snd_nxt == tc->snd_una_max || tc->rto_boff > 1
+ || tcp_timer_is_active (tc,
+ TCP_TIMER_RETRANSMIT)));
/* Allow updating of snd_una_max but don't update snd_nxt */
old_snd_nxt = tc->snd_nxt;
@@ -1456,8 +1489,8 @@
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);
}
/**
@@ -1490,7 +1523,7 @@
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;
@@ -1523,7 +1556,9 @@
* 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;
@@ -1535,9 +1570,12 @@
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 */
@@ -1547,6 +1585,7 @@
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;
}
@@ -1835,6 +1874,7 @@
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))
{