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/Users/yzchen/ns/ns-allinone-2.33/ns-2.33/src_rtg/hdr_src.h

00001 /* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
00002 /*
00003  * Copyright (c) 1996 Regents of the University of California.
00004  * All rights reserved.
00005  * 
00006  * Redistribution and use in source and binary forms, with or without
00007  * modification, are permitted provided that the following conditions
00008  * are met:
00009  * 1. Redistributions of source code must retain the above copyright
00010  *    notice, this list of conditions and the following disclaimer.
00011  * 2. Redistributions in binary form must reproduce the above copyright
00012  *    notice, this list of conditions and the following disclaimer in the
00013  *    documentation and/or other materials provided with the distribution.
00014  * 3. All advertising materials mentioning features or use of this software
00015  *    must display the following acknowledgement:
00016  *      This product includes software developed by the MASH Research
00017  *      Group at the University of California Berkeley.
00018  * 4. Neither the name of the University nor of the Research Group may be
00019  *    used to endorse or promote products derived from this software without
00020  *    specific prior written permission.
00021  * 
00022  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00023  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00024  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00025  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00026  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00027  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00028  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00029  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00030  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00031  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00032  * SUCH DAMAGE.
00033  */
00034 /*
00035  * Contributed by Rishi Bhargava <rishi_bhargava@yahoo.com> May, 2001.
00036  */
00037 
00038 
00039 #ifndef _HDR_SRC_H
00040 #define _HDR_SRC_H
00041 
00042 #include <assert.h>
00043 
00044 #include <packet.h>
00045 
00046 #define SR_HDR_SZ 4             // size of constant part of hdr
00047 
00048 #define MAX_SR_LEN 16           // longest source route we can handle
00049 
00050 
00051 typedef struct hash_node {
00052   int route_len;
00053   int route[30];
00054   int tag; /* this is the connection id*/
00055   struct hash_node *next;
00056 
00057 } h_node;
00058 
00059 
00060 struct hdr_src {
00061   int num_addrs_;
00062   int cur_addr_;
00063   int addrs[MAX_SR_LEN];
00064   
00065   int fid; // flow id of the connection 
00066 
00067   static int offset_;           /* offset for this header */
00068   inline int& offset() { return offset_; }
00069 
00070   inline static hdr_src* access(Packet* p) {
00071     return (hdr_src*) p->access(offset_);
00072   }
00073   
00074 
00075   inline int& num_addrs() {return num_addrs_;}
00076   inline int& cur_addr() {return cur_addr_;}
00077 
00078 
00079 };
00080 
00081 #endif

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