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dstcheck.cc
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Mon, Jul 7, 17:52

dstcheck.cc
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#include <click/config.h>
#include "util.hh"
#include "dstcheck.hh"
CLICK_DECLS
Dstcheck::Dstcheck() : _notifier(ActiveNotifier::SEARCH_CONTINUE_WAKE) {}
Dstcheck::~Dstcheck(){}
void * Dstcheck::cast(const char *n)
{
if (strcmp(n, ActiveNotifier::EMPTY_NOTIFIER) == 0){
return &_notifier;
}
else
return Element::cast(n);
}
int Dstcheck::configure(Vector<String> &conf, ErrorHandler *errh){
click_chatter("[Dstcheck] enters configure.\n");
_notifier.initialize(ActiveNotifier::EMPTY_NOTIFIER, router());
_debug = false;
_node_index = -1;
if (Args(conf, this, errh)
.read("INT1_ADDR", _addr_int1)
.read("INT2_ADDR", _addr_int2)
.read("DEBUG", _debug)
.read("NODE_INDEX", _node_index)
.complete() < 0)
return -1;
EtherAddress empty_addr = EtherAddress();
if(_addr_int1 == empty_addr && _addr_int2 == empty_addr){
click_chatter("[Dstcheck]: !!! ERROR: Have 0 interface, should have at least 1 !!!\n");
return 1;
}
//Store last bytes of both addresses for quick dst checks!
if(_addr_int1 != empty_addr){
_lb_int1 = LastAddrBytes(_addr_int1);
_lb_int1.set_hash();
}
if(_addr_int2 != empty_addr){
_lb_int2 = LastAddrBytes(_addr_int2);
_lb_int2.set_hash();
}
if(_debug)
click_chatter("[Dstcheck] configure done.\n");
return 0;
}
int Dstcheck::initialize(ErrorHandler *errh){
if(_debug)
click_chatter("[Dstcheck] Initializing...\n");
Element::initialize(errh);
return 0;
}
void Dstcheck::push(int port, Packet* p){
//assert(port == 0);
//Expects a layer 2.5 frame.
//check size:
if(p->length() < sizeof(empower_header)){
if(_debug)
click_chatter("[Dstcheck] dropping non-empower packet.\n");
p->kill();
return;
}
//check dst MAC
empower_header *header = (empower_header *)p->data();
//get last bytes of the route
//unsigned char *dst = &(header->_route._route[(header->_route._route_length-1)*NB_BYTES_HOP]);
unsigned char *dst = header->_route._dst;
LastAddrBytes lb = LastAddrBytes(dst);
if(lb == _lb_int1 || lb == _lb_int2){
//if(are_last_bytes_in_addr(dst, _addr_int1) || are_last_bytes_in_addr(dst, _addr_int2)){
if(_debug) click_chatter("[Dstcheck:%d] I am the final destination of this packet.\n",_node_index);
output(1).push(p);
} else {
if(_debug) click_chatter("[Dstcheck:%d] This packet is not for me.\n",_node_index);
output(0).push(p);
}
}
CLICK_ENDDECLS
EXPORT_ELEMENT(Dstcheck)
ELEMENT_PROVIDES(Dstcheck)

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