kaodv.c

ucsb大学开发的aodv路由协议代码。

/*****************************************************************************
 *
 * Copyright (C) 2001 Uppsala University and Ericsson Telecom AB.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Authors: Erik Nordstr鰉, <[e-mail]>
 *          Henrik Lundgren, <[e-mail]>
 *
 *****************************************************************************/
#include <linux/config.h>

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/version.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/wrapper.h>
#include <linux/string.h>
#include <linux/if_ether.h>
#include <linux/kmod.h>

#include <linux/skbuff.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <net/ip.h>
#include <net/dst.h> 
#include <net/route.h>
#include <linux/udp.h>
#include <net/neighbour.h>

/*  #define DEBUG_OUTPUT */

static struct nf_hook_ops nf_hook1, nf_hook2;

#ifdef DEBUG_OUTPUT
static struct nf_hook_ops nf_hook3;
#endif
char *ifname = "eth0";

unsigned int netfilter_hook(unsigned int hooknum,
			    struct sk_buff **skb,
			    const struct net_device *in,
			    const struct net_device *out,
			    int(*okfn)(struct sk_buff *)) {
 
  if(hooknum == NF_IP_PRE_ROUTING) {
    if(strcmp(in->name, ifname) != 0) {
     /*   printk("kaodv: NF_IP_PRE_ROUTING iface=%s\n", in->name); */
      return NF_ACCEPT;

    }
  }
  if(hooknum == NF_IP_LOCAL_OUT) {
    if(strcmp(out->name, ifname) != 0) {
   /*     printk("kaodv: NF_IP_LOCAL_OUT iface=%s\n", out->name); */
      return NF_ACCEPT;
    }
  }
#ifdef DEBUG_OUTPUT
  if(hooknum == NF_IP_POST_ROUTING) {
    struct rtable *rt = (struct rtable *)(*skb)->dst;

    if(strcmp(out->name, ifname) != 0) {
      /*     printk("kaodv: NF_IP_LOCAL_OUT iface=%s\n", out->name); */
      return NF_ACCEPT;
    }
    
    if((*skb)->nh.iph) {
      printk("kaodv: IP s=%u.%u.%u.%u d=%u.%u.%u.%u rt=%u.%u.%u.%u\n",
	     NIPQUAD((*skb)->nh.iph->saddr), NIPQUAD((*skb)->nh.iph->daddr), 
	     NIPQUAD(rt->rt_gateway));
    }
    return NF_ACCEPT;
  }
#endif
  /* We want AODV control messages to go through directly.... */
  if((*skb)->nh.iph && (*skb)->nh.iph->protocol == IPPROTO_UDP) {
  /*    printk("kaodv: IP s=%u.%u.%u.%u d=%u.%u.%u.%u\n", NIPQUAD((*skb)->nh.iph->saddr), NIPQUAD((*skb)->nh.iph->daddr)); */
    if((*skb)->sk != NULL) {
       /*  printk("UDP port d:%u s:%u msg\n", ntohs((*skb)->sk->dport), ntohs((*skb)->sk->sport));  */
      if((*skb)->sk->dport == htons(654) ||
	 ((*skb)->sk->sport == htons(654))) {
	/*  printk("aodv msg sent\n");   */
	return NF_ACCEPT;
      }
    }
  }
  
  if(ntohs((*skb)->protocol) == ETH_P_IP) {
   /*   printk("kaodv: IP s=%u.%u.%u.%u d=%u.%u.%u.%u\n", NIPQUAD((*skb)->nh.iph->saddr), NIPQUAD((*skb)->nh.iph->daddr)); */
/*      printk("kaodv: Returning NF_QUEUE!\n"); */
  
    return NF_QUEUE;
  } else
    return NF_ACCEPT;
  

}
  
/*
 * Called when the module is inserted in the kernel.
 */

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0))
MODULE_PARM(ifname, "s");
#endif

int init_module() {
  
  EXPORT_NO_SYMBOLS;
  
  /*   printk("kaodv: ifname=%s\n", ifname); */
  /* Make sure modules we need are loaded */
  /*  if(request_module("ip_queue") < 0) { */
  /*      printk("kaodv: could not load ip_queue module\n"); */
  /*   return -1; */
  /*   } */
  /*   if(request_module("iptable_filter") < 0) { */
  /*      printk("kaodv: could not load iptable_filter module\n"); */
  /*   return -1; */
  /*    } */
  
  nf_hook1.list.next = NULL;
  nf_hook1.list.prev = NULL;
  nf_hook1.hook = netfilter_hook;
  nf_hook1.pf = PF_INET;
  nf_hook1.hooknum = NF_IP_PRE_ROUTING;
  nf_register_hook(&nf_hook1);

  nf_hook2.list.next = NULL;
  nf_hook2.list.prev = NULL;
  nf_hook2.hook = netfilter_hook;
  nf_hook2.pf = PF_INET;
  nf_hook2.hooknum = NF_IP_LOCAL_OUT; 
  nf_register_hook(&nf_hook2);

#ifdef DEBUG_OUTPUT
  nf_hook3.list.next = NULL;
  nf_hook3.list.prev = NULL;
  nf_hook3.hook = netfilter_hook;
  nf_hook3.pf = PF_INET;
  nf_hook3.hooknum = NF_IP_POST_ROUTING; 
  nf_register_hook(&nf_hook3);
#endif
 
  
  
 /*   printk("kaodv: Initializing aodv kernel module.\n"); */
  
  return 0;
}
/*
 * Called when removing the module from memory... Reset the 
 * "aodv_need_route" pointer so that arp_send() goes back to normal operation.
 * Unregister the character device.
 */
void cleanup_module() {
   nf_unregister_hook(&nf_hook1);
   nf_unregister_hook(&nf_hook2);
#ifdef DEBUG_OUTPUT
   nf_unregister_hook(&nf_hook3);
#endif
}

MODULE_DESCRIPTION("AODV kernel support.