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checkorder.cc
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Sun, Jul 6, 16:42

checkorder.cc
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#include <click/config.h>
#include "checkorder.hh"
CLICK_DECLS
CheckOrder::CheckOrder() : _timer(this)
{
}
CheckOrder::~CheckOrder()
{
}
int
CheckOrder::configure(Vector<String> &conf, ErrorHandler *errh)
{
_active = false;
_debug = false;
if(Args(this, errh).bind(conf)
.read("DEBUG", _debug)
.read("VERB_DEBUG", _verb_debug)
.read("ACTIVE", _active)
.read("ONLY_TCP", _only_tcp)
.complete() < 0)
return -1;
return 0;
}
int
CheckOrder::initialize(ErrorHandler *)
{
_timer.initialize(this);
return 0;
}
void
CheckOrder::push(int port, Packet *p)
{
if(!_active) {
output(port).push(p);
return;
}
_timer.schedule_after_sec(1);
click_ip *ip_hdr = (click_ip *)(p->ip_header());
if(ip_hdr == 0)
ip_hdr = (click_ip *)(p->data()+sizeof(empower_header));
if(ip_hdr) {
IPAddress src = ip_hdr->ip_src;
empower_header *hdr = (empower_header *)(p->data());
_now.assign_now();
if(hdr->_type == REGULAR_TRAFFIC) {
_received[src]++;
if(!_only_tcp) {
if(is_in_hash_table(_last_empower_seq,src)) {
if(hdr->_seq != (_last_empower_seq[src]+1)%MAX_SEQ) {
click_chatter("[CheckOrder %s] Out-of-order empower packet from %s; is %u, last received %u", _now.unparse().c_str(), src.unparse().c_str(),
hdr->_seq, _last_empower_seq[src]);
_ooo[src]++;
}
}
_last_empower_seq.set(src,hdr->_seq);
}
}
if(ip_hdr->ip_p == IP_PROTO_TCP) {
click_tcp *tcp_hdr = (click_tcp *)(p->tcp_header());
if(tcp_hdr == 0)
tcp_hdr = (click_tcp *) (p->data()+sizeof(empower_header) + sizeof(click_ip));
if(tcp_hdr) {
uint16_t len = htons(ip_hdr->ip_len) - 52; // 52 is observed value (IP header + TCP header + 12 B padding)
bool traffic = true, ack=false;
if(tcp_hdr->th_flags & TH_SYN) {
traffic = false;
}
if(tcp_hdr->th_flags & TH_ACK) {
uint16_t a = htons(ip_hdr->ip_len);
uint32_t b = tcp_hdr->th_off;
uint32_t c = a - b*4 - 20;
if(c==0) {
traffic = false;
ack=true;
}
}
if(traffic) {
_received_tcp[src]++;
if(is_in_hash_table(_last_tcp_seq,src)) {
if(htonl(tcp_hdr->th_seq) != (_last_tcp_seq[src]+len)) {
_ooo_tcp[src]++;
click_chatter("[CheckOrder %s] Out-of-order TCP packet from %s; is %u, last received %u", _now.unparse().c_str(), src.unparse().c_str(),
htonl(tcp_hdr->th_seq), _last_tcp_seq[src]);
}
}
_last_tcp_seq.set(src,htonl(tcp_hdr->th_seq));
}
}
}
}
output(port).push(p);
}
void CheckOrder::run_timer(Timer *t) {
_now.assign_now();
for (HashTable<IPAddress, int>::iterator iter = _received.begin(); iter.live(); iter++) {
if(iter.value()>0)
click_chatter("[CheckOrder %s] Received %d empower packets, %d ooo; received %d TCP packets, %d ooo", _now.unparse().c_str(), iter.value(),
_ooo[iter.key()], _received_tcp[iter.key()], _ooo_tcp[iter.key()]);
}
}
int
CheckOrder::active_handler(const String &s, Element *e, void *,
ErrorHandler *errh) {
CheckOrder *elmt = (CheckOrder *)e;
int arg;
if(!cp_integer(s, &arg))
return errh->error("Active must be 0 or 1");
if (!(arg == 0 || arg == 1))
return errh->error("Active must be 0 or 1");
elmt->set_active(arg==1);
return 0;
}
int
CheckOrder::debug_handler(const String &s, Element *e, void *a,
ErrorHandler *errh) {
CheckOrder *elmt = (CheckOrder *)e;
int debug;
if(!cp_integer(s, &debug))
return errh->error("Debug must be 0 or 1");
if (!(debug == 0 || debug == 1))
return errh->error("Debug must be 0 or 1");
if(((intptr_t) a) == 0)
elmt->set_debug(debug==1);
else if(((intptr_t) a) == 1)
elmt->set_verb_debug(debug==1);
return 0;
}
void CheckOrder::add_handlers() {
add_write_handler("debug", debug_handler, 0);
add_write_handler("verb_debug", debug_handler, 1);
add_write_handler("active", active_handler, 0);
}
CLICK_ENDDECLS
EXPORT_ELEMENT(CheckOrder)
ELEMENT_MT_SAFE(CheckOrder)

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