00001 /* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */ 00002 /* 00003 * Copyright (c) 2005 INRIA 00004 * 00005 * This program is free software; you can redistribute it and/or modify 00006 * it under the terms of the GNU General Public License version 2 as 00007 * published by the Free Software Foundation; 00008 * 00009 * This program is distributed in the hope that it will be useful, 00010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00012 * GNU General Public License for more details. 00013 * 00014 * You should have received a copy of the GNU General Public License 00015 * along with this program; if not, write to the Free Software 00016 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00017 * 00018 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr> 00019 */ 00020 00021 #include "ns3/assert.h" 00022 00023 #include "mac-tx-middle.h" 00024 #include "wifi-mac-header.h" 00025 00026 namespace ns3 { 00027 00028 MacTxMiddle::MacTxMiddle () 00029 { 00030 m_sequence = 0; 00031 for (uint8_t i = 0; i < 16; i++) 00032 { 00033 m_qosSequences[i] = 0; 00034 } 00035 } 00036 00037 uint16_t 00038 MacTxMiddle::GetNextSequenceNumberfor (const WifiMacHeader *hdr) 00039 { 00040 uint16_t retval; 00041 if (hdr->IsQosData () && 00042 !hdr->GetAddr1 ().IsBroadcast ()) 00043 { 00044 uint8_t tid = hdr->GetQosTid (); 00045 NS_ASSERT (tid < 16); 00046 retval = m_qosSequences[tid]; 00047 m_qosSequences[tid]++; 00048 m_qosSequences[tid] %= 4096; 00049 } 00050 else 00051 { 00052 retval = m_sequence; 00053 m_sequence++; 00054 m_sequence %= 4096; 00055 } 00056 return retval; 00057 } 00058 00059 } // namespace ns3