From: liuyacan <liuyacan@corp.netease.com>
Date: Mon, 16 Aug 2021 02:51:13 +0000 (+0800)
Subject: tcp: Allow accepting session to send custom packet
X-Git-Tag: v22.02-rc0~90
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=1b6b09bb514831050b23397c078933c2ace3ff36;p=vpp.git

tcp: Allow accepting session to send custom packet

Tcp may want to send acks in established, but the app
has not called accept() yet.

Type: improvement

Signed-off-by: liuyacan <liuyacan@corp.netease.com>
Change-Id: I43b8cd386e533ca95c8ec260a0a1f695ea140358
---

diff --git a/src/vnet/session/session_node.c b/src/vnet/session/session_node.c
index b8b5ce2d8de..969f88c7e36 100644
--- a/src/vnet/session/session_node.c
+++ b/src/vnet/session/session_node.c
@@ -1018,7 +1018,15 @@ session_tx_not_ready (session_t * s, u8 peek_data)
       /* Can retransmit for closed sessions but can't send new data if
        * session is not ready or closed */
       else if (s->session_state < SESSION_STATE_READY)
-	return 1;
+	{
+	  /* Allow accepting session to send custom packets.
+	   * For instance, tcp want to send acks in established, but
+	   * the app has not called accept() yet */
+	  if (s->session_state == SESSION_STATE_ACCEPTING &&
+	      (s->flags & SESSION_F_CUSTOM_TX))
+	    return 0;
+	  return 1;
+	}
       else if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED)
 	{
 	  /* Allow closed transports to still send custom packets.