Disable Nagle on Linux and TLS cut through support

net/third_party/nss/ssl/ssl3gthr.c

 /*
  * Gather (Read) entire SSL3 records from socket into buffer.  
  *
  * ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
  * http://www.mozilla.org/MPL/
@@ skipping 170 matching lines @@
  *    and from SSL_ForceHandshake in sslsecur.c
  *    and from ssl3_GatherAppDataRecord below (<- DoRecv in sslsecur.c).
  *
  * Caller must hold the recv buf lock.
  */
 int
 ssl3_GatherCompleteHandshake(sslSocket *ss, int flags)
 {
     SSL3Ciphertext cText;
     int            rv;
+    PRBool         canFalseStart = PR_FALSE;
 
     PORT_Assert( ss->opt.noLocks || ssl_HaveRecvBufLock(ss) );
     do {
         /* bring in the next sslv3 record. */
         rv = ssl3_GatherData(ss, &ss->gs, flags);
         if (rv <= 0) {
             return rv;
         }
         
         /* decipher it, and handle it if it's a handshake. 
          * If it's application data, ss->gs.buf will not be empty upon return. 
          */
         cText.type    = (SSL3ContentType)ss->gs.hdr[0];
         cText.version = (ss->gs.hdr[1] << 8) | ss->gs.hdr[2];
         cText.buf     = &ss->gs.inbuf;
         rv = ssl3_HandleRecord(ss, &cText, &ss->gs.buf);
         if (rv < 0) {
             return ss->recvdCloseNotify ? 0 : rv;
         }
-    } while (ss->ssl3.hs.ws != idle_handshake && ss->gs.buf.len == 0);
+
+        if (ss->opt.enableFalseStart) {
+            ssl_GetSSL3HandshakeLock(ss);
+            canFalseStart = (ss->ssl3.hs.ws == wait_change_cipher ||
+                             ss->ssl3.hs.ws == wait_new_session_ticket) &&
+                            ssl3_CanFalseStart(ss);
+            ssl_ReleaseSSL3HandshakeLock(ss);
+        }
+    } while (ss->ssl3.hs.ws != idle_handshake &&
+             !canFalseStart &&
+             ss->gs.buf.len == 0);
 
     ss->gs.readOffset = 0;
     ss->gs.writeOffset = ss->gs.buf.len;
     return 1;
 }
 
 /* Repeatedly gather in a record and when complete, Handle that record.
  * Repeat this until some application data is received.
  *
  * Returns  1 when application data is available.
  * Returns  0 if ssl3_GatherData hits EOF.
  * Returns -1 on read error, or PR_WOULD_BLOCK_ERROR, or handleRecord error.
  * Returns -2 on SECWouldBlock return from ssl3_HandleRecord.
  *
  * Called from DoRecv in sslsecur.c
  * Caller must hold the recv buf lock.
  */
 int
 ssl3_GatherAppDataRecord(sslSocket *ss, int flags)
 {
     int            rv;
 
     PORT_Assert( ss->opt.noLocks || ssl_HaveRecvBufLock(ss) );
     do {
         rv = ssl3_GatherCompleteHandshake(ss, flags);
     } while (rv > 0 && ss->gs.buf.len == 0);
 
     return rv;
 }