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tcpreorderer.cc
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tcpreorderer.cc
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// -*- c-basic-offset: 4 -*-
#include <click/config.h>
#include "tcpreorderer.hh"
#include <click/ipaddress.hh>
#include <click/error.hh>
#include <click/packet_anno.hh>
#include <click/confparse.hh>
CLICK_DECLS
TCPReorderer::TCPReorderer()
: _timer(this), _sanity_count(0), _elem_cld(0)
{
for (int i = 0; i < NMAP; i++)
_map[i] = 0;
}
TCPReorderer::~TCPReorderer()
{
}
int
TCPReorderer::configure(Vector<String> &conf, ErrorHandler *errh)
{
Element *cld_element = 0;
if (cp_va_kparse(conf, this, errh,
"CALCLATENCYDELTA", cpkM, cpElement, &cld_element,
cpEnd) < 0)
return -1;
CalcLatencyDelta *cld = 0;
if (cld_element &&
!(cld = (CalcLatencyDelta *)(cld_element->cast("CalcLatencyDelta"))))
return errh->error("CALCLATENCYDELTA must be a CalcLatencyDelta element");
else if (cld)
_elem_cld = cld;
return 0;
}
int
TCPReorderer::initialize(ErrorHandler *)
{
_timer.initialize(this);
_timer.schedule_now();
return 0;
}
void
TCPReorderer::add_handlers()
{
// add_write_handler("set_rtt", static_set_rtt, 0);
}
void
TCPReorderer::cleanup(CleanupStage)
{
for (int i = 0; i < NMAP; i++) {
while (_map[i]) {
while (_map[i]->pkt) {
Packet *p = remove_first_pkt(_map[i]);
p->kill();
}
FlowNode *fn = _map[i];
_map[i] = fn->next;
delete fn;
}
}
}
void
TCPReorderer::push(int, Packet *p)
{
FlowNode *fn = get_flow_node(p);
if (!fn) { // Never seen before, so add to map and forward
add_flow_node(p);
output(0).push(p);
} else { // We have seen it before
if (SEQ_GEQ(fn->seq_num, static_get_seq_num(p))) { // should forward
tcp_seq_t tmp = static_get_seq_num(p) + static_get_data_length(p);
fn->seq_num = fn->seq_num > tmp ? fn->seq_num : tmp;
#ifdef CLICK_TCPREORDERER_DEBUG
click_chatter("INORDER: flow_num(%u) seq_num(%u) pkt_length(%u) next_seq_num(%u)",
fn->flow_num, static_get_seq_num(p),
static_get_data_length(p), fn->seq_num);
#endif
output(0).push(p);
// forward any packets right after just arrived packet
while(fn->pkt && SEQ_GEQ(fn->seq_num, static_get_seq_num(fn->pkt))) {
Packet *q = remove_first_pkt(fn);
#ifdef CLICK_TCPREORDERER_DEBUG
click_chatter("FORWARDING packet was holding: seq_num(%u)",
static_get_seq_num(q));
#endif
output(0).push(q);
}
fn->timestamp = Timestamp::now().sec();
} else {
#ifdef CLICK_TCPREORDERER_DEBUG
click_chatter("OUT OF ORDER: flow_num(%u) pkt_seq_num(%u) seq_num(%u)",
fn->flow_num, static_get_seq_num(p), fn->seq_num);
#endif
insert_pkt_into_flow_node(fn, p);
}
}
_sanity_count++;
if (_sanity_count >= CLEAN_MAP_SANITY) {
#ifdef CLICK_TCPREORDERER_DEBUG_OFF
click_chatter("------SANITY CLEAN-------");
#endif
clean_map(_map, Timestamp::now(), get_max_delta());
_sanity_count = 0;
}
}
void
TCPReorderer::run_timer(Timer *timer)
{
assert(timer == &_timer);
#ifdef CLICK_TCPREORDERER_DEBUG_OFF
click_chatter("------TIME CLEAN-------");
#endif
int max_delta = get_max_delta();
clean_map(_map, Timestamp::now(), max_delta);
//max_delta is in usec, so first convert to msec
_timer.reschedule_after_msec((max_delta/1000)/2);
}
// void
// TCPReorderer::set_rtt(int new_rtt)
// {
// _max_rtt = new_rtt;
// }
// int
// TCPReorderer::static_set_rtt(const String &data, Element *element, void*,
// ErrorHandler *errh)
// {
// TCPReorderer *tr = (TCPReorderer *)element;
// int new_rtt = tr->_max_rtt;
// if(!cp_integer(data, &new_rtt))
// return errh->error("New RTT is not a number");
// tr->set_rtt(new_rtt);
// return 0;
// }
void
TCPReorderer::clean_map(FlowNode **map, const Timestamp now, int max_delta)
{
const Timestamp pkt_timeout = now - Timestamp::make_usec(max_delta);
Timestamp::seconds_type flow_timeout = now.sec() - REAP_TIMEOUT;
for (int i = 0; i < NMAP; i++) {
FlowNode *fn = map[i];
FlowNode *prev = 0;
while (fn) {
// Check if flow is too old and remove if it is
if (fn->timestamp <= flow_timeout) {
#ifdef CLICK_TCPREORDERER_DEBUG
click_chatter("CLEANUP FN: flow_num(%u)", fn->flow_num);
#endif
// Push out all packets
while (fn->pkt) {
#ifdef CLICK_TCPREORDERER_DEBUG
click_chatter(" RELEASE PKT: seq_num(%u)",
static_get_seq_num(fn->pkt));
#endif
output(0).push(remove_first_pkt(fn));
}
FlowNode *next = fn->next;
if (prev) {
prev->next = next;
} else {
map[i] = next;
}
delete fn;
fn = next;
} else if (fn->pkt) { // flow not old, check packets
Packet *curr = fn->tail;
while(curr && (curr->timestamp_anno() > pkt_timeout)) {
curr = curr->prev();
}
if (curr) { // There are packets we need to forward
while (fn->pkt != curr) {
#ifdef CLICK_TCPREORDERER_DEBUG
click_chatter("TIMEOUT PKT: flow_num(%u) seq_num(%u)",
fn->flow_num, static_get_seq_num(fn->pkt));
#endif
output(0).push(remove_first_pkt(fn));
}
#ifdef CLICK_TCPREORDERER_DEBUG
click_chatter("TIMEOUT PKT: flow_num(%u) seq_num(%u)",
fn->flow_num, static_get_seq_num(fn->pkt));
#endif
output(0).push(remove_first_pkt(fn)); // remove curr
}
fn = fn->next;
} else {
fn = fn->next;
}
}
}
}
void
TCPReorderer::add_flow_node(Packet *pkt)
{
assert(pkt->has_transport_header());
FlowNode *fn = new FlowNode;
fn->flow_num = AGGREGATE_ANNO(pkt);
fn->seq_num = static_get_seq_num(pkt);
fn->seq_num+= static_get_data_length(pkt);
fn->timestamp = Timestamp::now().sec();
fn->next = _map[fn->flow_num % NMAP];
fn->pkt = 0;
_map[fn->flow_num % NMAP] = fn;
#ifdef CLICK_TCPREORDERER_DEBUG
click_chatter("NEW FLOW: flow_num(%u) pkt_seq_num(%u) seq_num(%u)",
fn->flow_num, static_get_seq_num(pkt), fn->seq_num);
#endif
}
TCPReorderer::FlowNode *
TCPReorderer::get_flow_node(Packet *pkt)
{
FlowNode *curr = _map[AGGREGATE_ANNO(pkt) % NMAP];
while(curr) {
if (curr->flow_num == AGGREGATE_ANNO(pkt))
return curr;
curr = curr->next;
}
return 0;
}
void
TCPReorderer::insert_pkt_into_flow_node(FlowNode *fn, Packet *pkt)
{
if (!fn || !pkt)
return;
if (!(pkt->timestamp_anno().sec()))
pkt->timestamp_anno().assign_now();
pkt->set_next(0);
pkt->set_prev(0);
if (!fn->pkt) {
fn->pkt = pkt;
fn->tail = pkt;
} else if (SEQ_LT(static_get_seq_num(pkt), static_get_seq_num(fn->pkt))) {
pkt->set_next(fn->pkt);
fn->pkt->set_prev(pkt);
fn->pkt = pkt;
} else {
Packet *curr = fn->pkt->next();
Packet *prev = fn->pkt;
while (curr &&
SEQ_GEQ(static_get_seq_num(pkt), static_get_seq_num(curr))) {
prev = curr;
curr = curr->next();
}
pkt->set_next(curr);
pkt->set_prev(prev);
if (curr)
curr->set_prev(pkt);
else // at end of the list
fn->tail =pkt;
prev->set_next(pkt);
}
fn->timestamp = Timestamp::now().sec();
}
Packet *
TCPReorderer::remove_first_pkt(FlowNode *fn)
{
if (!fn || !fn->pkt)
return 0;
Packet *q = fn->pkt;
fn->pkt = q->next();
q->set_prev(0);
q->set_next(0);
if (fn->pkt)
fn->pkt->set_prev(0);
else // no packets left
fn->tail = 0;
fn->seq_num = static_get_seq_num(q) + static_get_data_length(q);
fn->timestamp = Timestamp::now().sec();
return q;
}
int
TCPReorderer::get_max_delta()
{
return _elem_cld->get_max_delta();
}
uint32_t
TCPReorderer::static_get_seq_num(Packet *p)
{
assert(p->has_transport_header());
return ntohl(p->tcp_header()->th_seq);
}
uint32_t
TCPReorderer::static_get_data_length(Packet *p)
{
uint32_t length = p->length() - (p->tcp_header()->th_off * 4);
if (length == 0 && ((p->tcp_header()->th_flags & TH_SYN) || (p->tcp_header()->th_flags & TH_FIN)))
length = 1;
return length;
}
CLICK_ENDDECLS
EXPORT_ELEMENT(TCPReorderer)