Adding Malicious Node in AODV

How to implement malicious drop in AODV. To write simple code for adding malicious node in AODV ( or in any routing protocol).

First you need to modify aodv.cc and aodv.h files. In aodv.h after

/* The Routing Agent */

class AODV: public Agent {

...

/*

* History management

*/

double PerHopTime(aodv_rt_entry *rt);

...

add following line

bool malicious;



/*

Constructor

*/

AODV::AODV(nsaddr_t id) : Agent(PT_AODV), btimer(this), htimer(this), ntimer(this), rtimer(this), lrtimer(this), rqueue() {

index = id;

seqno = 2;

bid = 1;

add following line

malicious = false;

The above code is needed to initialize, and all nodes are initially not malicious. Then we will write a code to catch which node is set as malicious. In aodv.cc after

if(argc == 2) {

Tcl& tcl = Tcl::instance();

if(strncasecmp(argv[1], "id", 2) == 0) {

tcl.resultf("%d", index);

return TCL_OK;

}

add following line

if(strcmp(argv[1], "hacker") == 0) {

malicious = true;

return TCL_OK;

}

Now we will do some work in TCL to set a malicious node. Using script in my post , we add following line to set node 5 as malicious node.

$ns at 0.0 "[$mnode_(5) set ragent_] hacker"

You may add this line after

for {set i 0} {$i < $val(nn)} { incr i } {

$ns initial_node_pos $mnode_($i) 10

}

...

Alright, we have set malicious node but we did not tell malicious node what to do. As it is known, rt_resolve(Packet *p) function is used to select next hop node when routing data packets. So, we tell malicious node just drop any packet when it receives. To do that after

/*

Route Handling Functions

*/

void

AODV::rt_resolve(Packet *p) {

struct hdr_cmn *ch = HDR_CMN(p);

struct hdr_ip *ih = HDR_IP(p);

aodv_rt_entry *rt;

...

We add a few lines

// if I am malicious node

if (malicious == true ) {

drop(p, DROP_RTR_ROUTE_LOOP);

// DROP_RTR_ROUTE_LOOP is added for no reason.

}

And implementing malicious node is done. I hope the post will be helpful to design your secure routing protocol.