commit 3ffc77da2b750a43c1a254612a5856277f749e68
author Florin Coras <fcoras@cisco.com> Thu Feb 16 18:59:38 2023 -0800
committer Dave Wallace <dwallacelf@gmail.com> Mon Mar 06 23:02:19 2023 +0000
tree d412c458700e3100d3f19b36ea58be473d1498b5
parent a41a0b5a4c8430a6141fc847d43484ab1c4b2a0a

tcp: allow syns in closed state

Type: improvement

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: If223096cf912c1748ae417b40585a9bea5d9d9a9

src/vnet/tcp/tcp_input.c

diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index 9e2ff19..32de187 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -2628,7 +2628,8 @@
 	{
 	  lc = tcp_listener_get (vnet_buffer (b[0])->tcp.connection_index);
 	}
-      else /* We are in TimeWait state*/
+      /* Probably we are in time-wait or closed state */
+      else
 	{
 	  tcp_connection_t *tc;
 	  tc = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index,
@@ -3350,7 +3351,7 @@
   _(CLOSED, TCP_FLAG_RST | TCP_FLAG_ACK, TCP_INPUT_NEXT_DROP,
     TCP_ERROR_CONNECTION_CLOSED);
   _(CLOSED, TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED);
-  _(CLOSED, TCP_FLAG_SYN, TCP_INPUT_NEXT_RESET, TCP_ERROR_CONNECTION_CLOSED);
+  _ (CLOSED, TCP_FLAG_SYN, TCP_INPUT_NEXT_LISTEN, TCP_ERROR_NONE);
   _(CLOSED, TCP_FLAG_FIN | TCP_FLAG_ACK, TCP_INPUT_NEXT_RESET,
     TCP_ERROR_CONNECTION_CLOSED);
 #undef _