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authorDave Barach <dave@barachs.net>2017-04-14 16:46:44 -0400
committerFlorin Coras <florin.coras@gmail.com>2017-04-18 17:02:41 +0000
commit1f75cfd73320476a8f821064391fe368dd4bf75b (patch)
treedb7b236512fd5fe299bf8598f73e38e82938f8a0 /src/vnet/tcp/tcp_input.c
parentfb5b2af2c0bf1ea38129d6e7cf669e2c1d14e220 (diff)
Fix fifo ooo bugs and improve testing
Change-Id: If3c01e318bcb740ca5b240c63f712e2167082a80 Signed-off-by: Dave Barach <dave@barachs.net> Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/tcp/tcp_input.c')
-rw-r--r--src/vnet/tcp/tcp_input.c28
1 files changed, 19 insertions, 9 deletions
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index a12ad8c0c28..97679aaf30a 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -211,8 +211,6 @@ tcp_options_parse (tcp_header_t * th, tcp_options_t * to)
always_inline int
tcp_segment_check_paws (tcp_connection_t * tc)
{
- /* XXX normally test for timestamp should be lt instead of leq, but for
- * local testing this is not enough */
return tcp_opts_tstamp (&tc->opt) && tc->tsval_recent
&& timestamp_lt (tc->opt.tsval, tc->tsval_recent);
}
@@ -999,7 +997,7 @@ tcp_session_enqueue_ooo (tcp_connection_t * tc, vlib_buffer_t * b,
u16 data_len)
{
stream_session_t *s0;
- u32 offset, seq;
+ u32 offset;
int rv;
/* Pure ACK. Do nothing */
@@ -1009,8 +1007,9 @@ tcp_session_enqueue_ooo (tcp_connection_t * tc, vlib_buffer_t * b,
}
s0 = stream_session_get (tc->c_s_index, tc->c_thread_index);
- seq = vnet_buffer (b)->tcp.seq_number;
- offset = seq - tc->rcv_nxt;
+ offset = vnet_buffer (b)->tcp.seq_number - tc->irs;
+
+ clib_warning ("ooo: offset %d len %d", offset, data_len);
rv = svm_fifo_enqueue_with_offset (s0->server_rx_fifo, s0->pid, offset,
data_len, vlib_buffer_get_current (b));
@@ -1032,8 +1031,8 @@ tcp_session_enqueue_ooo (tcp_connection_t * tc, vlib_buffer_t * b,
/* Get the newest segment from the fifo */
newest = svm_fifo_newest_ooo_segment (s0->server_rx_fifo);
- start = tc->rcv_nxt + ooo_segment_offset (s0->server_rx_fifo, newest);
- end = tc->rcv_nxt + ooo_segment_end_offset (s0->server_rx_fifo, newest);
+ start = ooo_segment_offset (s0->server_rx_fifo, newest);
+ end = ooo_segment_end_offset (s0->server_rx_fifo, newest);
tcp_update_sack_list (tc, start, end);
}
@@ -1072,6 +1071,7 @@ tcp_segment_rcv (tcp_main_t * tm, tcp_connection_t * tc, vlib_buffer_t * b,
{
/* Old sequence numbers allowed through because they overlapped
* the rx window */
+
if (seq_lt (vnet_buffer (b)->tcp.seq_number, tc->rcv_nxt))
{
error = TCP_ERROR_SEGMENT_OLD;
@@ -1181,6 +1181,7 @@ tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
u32 n_left_from, next_index, *from, *to_next;
u32 my_thread_index = vm->thread_index, errors = 0;
tcp_main_t *tm = vnet_get_tcp_main ();
+ u8 is_fin = 0;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
@@ -1243,9 +1244,11 @@ tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
n_advance_bytes0 += sizeof (ip60[0]);
}
+ is_fin = (th0->flags & TCP_FLAG_FIN) != 0;
+
/* SYNs, FINs and data consume sequence numbers */
vnet_buffer (b0)->tcp.seq_end = vnet_buffer (b0)->tcp.seq_number
- + tcp_is_syn (th0) + tcp_is_fin (th0) + n_data_bytes0;
+ + tcp_is_syn (th0) + is_fin + n_data_bytes0;
/* TODO header prediction fast path */
@@ -1272,8 +1275,11 @@ tcp46_established_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_buffer_advance (b0, n_advance_bytes0);
error0 = tcp_segment_rcv (tm, tc0, b0, n_data_bytes0, &next0);
+ /* N.B. buffer is rewritten if segment is ooo. Thus, th0 becomes a
+ * dangling reference. */
+
/* 8: check the FIN bit */
- if (tcp_fin (th0))
+ if (is_fin)
{
/* Enter CLOSE-WAIT and notify session. Don't send ACK, instead
* wait for session to call close. To avoid lingering
@@ -2365,8 +2371,12 @@ tcp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
if (PREDICT_FALSE (error0 == TCP_ERROR_DISPATCH))
{
+ tcp_state_t state0 = tc0->state;
/* Overload tcp flags to store state */
vnet_buffer (b0)->tcp.flags = tc0->state;
+ clib_warning ("disp error state %U flags %U",
+ format_tcp_state, &state0,
+ format_tcp_flags, flags0);
}
}
else