From: Florin Coras <fcoras@cisco.com>
Date: Wed, 1 Nov 2023 20:01:48 +0000 (-0700)
Subject: tcp: allow ooo data in syn-rcvd
X-Git-Tag: v24.06-rc0~175
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=refs%2Fchanges%2F16%2F39816%2F4;p=vpp.git

tcp: allow ooo data in syn-rcvd

As long as ack and segment are legitimate accept ooo data as we
transition to established.

Type: improvement

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: I85cdc65d70cb8ae689a9ce9bbe4f86228b1ac533
---

diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index 932a7ec66ab..5e85f13cbac 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -2125,15 +2125,6 @@ tcp46_rcv_process_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
       switch (tc->state)
 	{
 	case TCP_STATE_SYN_RCVD:
-
-	  /* Make sure the segment is exactly right */
-	  if (tc->rcv_nxt != vnet_buffer (b[0])->tcp.seq_number)
-	    {
-	      tcp_send_reset_w_pkt (tc, b[0], thread_index, is_ip4);
-	      error = TCP_ERROR_SEGMENT_INVALID;
-	      goto drop;
-	    }
-
 	  /*
 	   * If the segment acknowledgment is not acceptable, form a
 	   * reset segment,