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Commit c2fa97e2 authored by Marcin Siodelski's avatar Marcin Siodelski
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[1959] Implemented changes from the 3rd part of code review.

parent ad297b10
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tests/tools/perfdhcp/test_control.cc
View file @ c2fa97e2
......@@ -45,14 +45,21 @@ namespace perfdhcp {
bool TestControl::interrupted_ = false;
TestControl::TestControlSocket::TestControlSocket(int socket) :
socket_(socket),
addr_("127.0.0.1") {
initSocketData();
TestControl::TestControlSocket::TestControlSocket(const int socket) :
SocketInfo(socket, asiolink::IOAddress("127.0.0.1"), 0),
ifindex_(0), valid_(true) {
try {
initSocketData();
} catch (const Exception&) {
valid_ = false;
}
}
TestControl::TestControlSocket::~TestControlSocket() {
IfaceMgr::instance().closeSockets();
IfaceMgr::Iface* iface = IfaceMgr::instance().getIface(ifindex_);
if (iface) {
iface->delSocket(sockfd_);
}
}
void
......@@ -68,8 +75,7 @@ TestControl::TestControlSocket::initSocketData() {
socket_collection.begin();
s != socket_collection.end();
++s) {
if (s->sockfd_ == socket_) {
iface_ = it->getName();
if (s->sockfd_ == sockfd_) {
ifindex_ = it->getIndex();
addr_ = s->addr_;
return;
......@@ -269,6 +275,7 @@ TestControl::factoryGeneric(Option::Universe u, uint16_t type,
OptionPtr
TestControl::factoryIana6(Option::Universe, uint16_t,
const OptionBuffer& buf) {
// @todo allow different values of T1, T2 and IAID.
const uint8_t buf_array[] = {
0, 0, 0, 1, // IAID = 1
0, 0, 3600 >> 8, 3600 && 0xff, // T1 = 3600
......@@ -333,7 +340,7 @@ TestControl::generateMacAddress(uint8_t& randomized) const {
isc_throw(BadValue, "invalid MAC address template specified");
}
uint32_t r = random();
// The random number must be in the range 0..clients_num. This
// The random number must be in the range 0..clients_num-1. This
// will guarantee that every client has exactly one random MAC
// address assigned.
r %= clients_num;
......@@ -370,13 +377,31 @@ TestControl::generateDuid(uint8_t& randomized) const {
std::vector<uint8_t> duid(options.getDuidTemplate());
// @todo: add support for DUIDs of different sizes.
std::vector<uint8_t> mac_addr(generateMacAddress(randomized));
duid.resize(duid.size() - mac_addr.size());
for (int i = 0; i < mac_addr.size(); ++i) {
duid.push_back(mac_addr[i]);
}
duid.resize(duid.size());
std::copy(mac_addr.begin(), mac_addr.end(),
duid.begin() + duid.size() - mac_addr.size());
return (duid);
}
template<class T>
uint32_t
TestControl::getElapsedTime(const T& pkt1, const T& pkt2) {
using namespace boost::posix_time;
ptime pkt1_time = pkt1->getTimestamp();
ptime pkt2_time = pkt2->getTimestamp();
if (pkt1_time.is_not_a_date_time() ||
pkt2_time.is_not_a_date_time()) {
isc_throw(InvalidOperation, "packet timestamp not set");;
}
time_period elapsed_period(pkt1_time, pkt2_time);
if (elapsed_period.is_null()) {
isc_throw(InvalidOperation, "unable to calculate time elapsed"
" between packets");
}
return(elapsed_period.length().total_milliseconds());
}
uint64_t
TestControl::getNextExchangesNum() const {
CommandOptions& options = CommandOptions::instance();
......@@ -399,7 +424,9 @@ TestControl::getNextExchangesNum() const {
// of exchanges to be initiated.
due_exchanges = static_cast<uint64_t>(due_factor * options.getRate());
// We want to make sure that at least one packet goes out.
due_exchanges += 1;
if (due_exchanges == 0) {
due_exchanges = 1;
}
// We should not exceed aggressivity as it could have been
// restricted from command line.
if (due_exchanges > options.getAggressivity()) {
......@@ -441,7 +468,7 @@ TestControl::getTemplateBuffer(const size_t idx) const {
if (template_buffers_.size() > idx) {
return (template_buffers_[idx]);
}
return (TemplateBuffer());
isc_throw(OutOfRange, "invalid buffer index");
}
void
......@@ -455,8 +482,7 @@ TestControl::initPacketTemplates() {
CommandOptions& options = CommandOptions::instance();
std::vector<std::string> template_files = options.getTemplateFiles();
for (std::vector<std::string>::const_iterator it = template_files.begin();
it != template_files.end();
++it) {
it != template_files.end(); ++it) {
readPacketTemplate(*it);
}
}
......@@ -738,10 +764,13 @@ TestControl::receivePacket6(const TestControlSocket& socket,
CommandOptions::ExchangeMode xchg_mode =
CommandOptions::instance().getExchangeMode();
if ((xchg_mode == CommandOptions::DORA_SARR) && solicit_pkt6) {
// \todo check whether received ADVERTISE packet is sane.
// We might want to check if STATUS_CODE option is non-zero
// and if there is IAADR option in IA_NA.
if (template_buffers_.size() < 2) {
sendRequest6(socket, solicit_pkt6, pkt6);
sendRequest6(socket, pkt6);
} else {
sendRequest6(socket, template_buffers_[1], solicit_pkt6, pkt6);
sendRequest6(socket, template_buffers_[1], pkt6);
}
}
} else if (packet_type == DHCPV6_REPLY) {
......@@ -880,16 +909,25 @@ TestControl::run() {
"command options must be parsed before running a test");
}
// Diagnostics is command line options mainly.
// Diagnostics are command line options mainly.
printDiagnostics();
// Option factories have to be registered.
registerOptionFactories();
TestControlSocket socket(openSocket());
if (!socket.valid_) {
isc_throw(Unexpected, "invalid socket descriptor");
}
// Initialize packet templates.
initPacketTemplates();
// Initialize randomization seed.
if (options.isSeeded()) {
srandom(options.getSeed());
} else {
// Seed with current time.
time_period duration(from_iso_string("20111231T235959"),
microsec_clock::universal_time());
srandom(duration.length().total_seconds()
+ duration.length().fractional_seconds());
}
// If user interrupts the program we will exit gracefully.
signal(SIGINT, TestControl::handleInterrupt);
......@@ -898,10 +936,12 @@ TestControl::run() {
for (int i = 0; i < options.getPreload(); ++i) {
if (options.getIpVersion() == 4) {
// No template buffer means no -T option specified.
// We will build packet ourselfs.
// We will build packet ourselves.
if (template_buffers_.size() == 0) {
sendDiscover4(socket, do_preload);
} else {
// Pick template #0 if Discover is being sent.
// For Request it would be #1.
const uint8_t template_idx = 0;
sendDiscover4(socket, template_buffers_[template_idx],
do_preload);
......@@ -912,6 +952,8 @@ TestControl::run() {
if (template_buffers_.size() == 0) {
sendSolicit6(socket, do_preload);
} else {
// Pick template #0 if Solicit is being sent.
// For Request it would be #1.
const uint8_t template_idx = 0;
sendSolicit6(socket, template_buffers_[template_idx],
do_preload);
......@@ -1187,7 +1229,7 @@ TestControl::sendRequest4(const TestControlSocket& socket,
std::vector<uint8_t> mac_address(chaddr, chaddr + HW_ETHER_LEN);
pkt4->writeAt(rand_offset, mac_address.begin(), mac_address.end());
// Set elapsed time.
// Set elapsed time.
size_t elp_offset = 0;
if (options.getElapsedTimeOffset() > 0) {
elp_offset = options.getElapsedTimeOffset();
......@@ -1266,16 +1308,12 @@ TestControl::sendRequest4(const TestControlSocket& socket,
void
TestControl::sendRequest6(const TestControlSocket& socket,
const Pkt6Ptr& solicit_pkt6,
const Pkt6Ptr& advertise_pkt6) {
const uint32_t transid = generateTransid();
Pkt6Ptr pkt6(new Pkt6(DHCPV6_REQUEST, transid));
// Set elapsed time.
const uint32_t elapsed_time =
getElapsedTime<Pkt6Ptr>(solicit_pkt6, advertise_pkt6);
OptionPtr opt_elapsed_time =
Option::factory(Option::V6, D6O_ELAPSED_TIME);
opt_elapsed_time->setUint16(static_cast<uint16_t>(elapsed_time / 10));
pkt6->addOption(opt_elapsed_time);
// Set client id.
OptionPtr opt_clientid = advertise_pkt6->getOption(D6O_CLIENTID);
......@@ -1323,7 +1361,6 @@ TestControl::sendRequest6(const TestControlSocket& socket,
void
TestControl::sendRequest6(const TestControlSocket& socket,
const std::vector<uint8_t>& template_buf,
const Pkt6Ptr& solicit_pkt6,
const Pkt6Ptr& advertise_pkt6) {
CommandOptions& options = CommandOptions::instance();
// Get the second argument if multiple the same arguments specified
......@@ -1343,12 +1380,9 @@ TestControl::sendRequest6(const TestControlSocket& socket,
if (options.getElapsedTimeOffset() > 0) {
elp_offset = options.getElapsedTimeOffset();
}
uint32_t elapsed_time =
getElapsedTime<Pkt6Ptr>(solicit_pkt6, advertise_pkt6);
boost::shared_ptr<LocalizedOption>
opt_elapsed_time(new LocalizedOption(Option::V6, D6O_ELAPSED_TIME,
OptionBuffer(), elp_offset));
opt_elapsed_time->setUint16(static_cast<uint16_t>(elapsed_time / 10));
pkt6->addOption(opt_elapsed_time);
// Get the actual server id offset.
......@@ -1537,9 +1571,13 @@ TestControl::setDefaults4(const TestControlSocket& socket,
const Pkt4Ptr& pkt) {
CommandOptions& options = CommandOptions::instance();
// Interface name.
pkt->setIface(socket.getIface());
IfaceMgr::Iface* iface = IfaceMgr::instance().getIface(socket.ifindex_);
if (iface == NULL) {
isc_throw(BadValue, "unable to find interface with given index");
}
pkt->setIface(iface->getName());
// Interface index.
pkt->setIndex(socket.getIfIndex());
pkt->setIndex(socket.ifindex_);
// Local client's port (68)
pkt->setLocalPort(DHCP4_CLIENT_PORT);
// Server's port (67)
......@@ -1547,9 +1585,9 @@ TestControl::setDefaults4(const TestControlSocket& socket,
// The remote server's name or IP.
pkt->setRemoteAddr(IOAddress(options.getServerName()));
// Set local addresss.
pkt->setLocalAddr(IOAddress(socket.getAddress()));
pkt->setLocalAddr(IOAddress(socket.addr_));
// Set relay (GIADDR) address to local address.
pkt->setGiaddr(IOAddress(socket.getAddress()));
pkt->setGiaddr(IOAddress(socket.addr_));
// Pretend that we have one relay (which is us).
pkt->setHops(1);
}
......@@ -1559,15 +1597,19 @@ TestControl::setDefaults6(const TestControlSocket& socket,
const Pkt6Ptr& pkt) {
CommandOptions& options = CommandOptions::instance();
// Interface name.
pkt->setIface(socket.getIface());
IfaceMgr::Iface* iface = IfaceMgr::instance().getIface(socket.ifindex_);
if (iface == NULL) {
isc_throw(BadValue, "unable to find interface with given index");
}
pkt->setIface(iface->getName());
// Interface index.
pkt->setIndex(socket.getIfIndex());
pkt->setIndex(socket.ifindex_);
// Local client's port (547)
pkt->setLocalPort(DHCP6_CLIENT_PORT);
// Server's port (548)
pkt->setRemotePort(DHCP6_SERVER_PORT);
// Set local address.
pkt->setLocalAddr(socket.getAddress());
pkt->setLocalAddr(socket.addr_);
// The remote server's name or IP.
pkt->setRemoteAddr(IOAddress(options.getServerName()));
}
......@@ -1606,6 +1648,10 @@ TestControl::updateSendDue() {
send_due_ = last_sent_ + time_duration(0, 0, 0, duration);
// Check if it is already due.
ptime now(microsec_clock::universal_time());
// \todo verify if this condition is not too tight. In other words
// verify if this will not produce too many late sends.
// We might want to look at this once we are done implementing
// microsecond timeouts in IfaceMgr.
if (now > send_due_) {
if (testDiags('i')) {
if (options.getIpVersion() == 4) {
......
tests/tools/perfdhcp/test_control.h
View file @ c2fa97e2
......@@ -23,6 +23,7 @@
#include <boost/function.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <dhcp/iface_mgr.h>
#include <dhcp/dhcp6.h>
#include <dhcp/pkt4.h>
#include <dhcp/pkt6.h>
......@@ -48,7 +49,7 @@ namespace perfdhcp {
class TestControl : public boost::noncopyable {
public:
/// Default transaction id offset.
/// Default transaction id offset.
static const size_t DHCPV4_TRANSID_OFFSET = 4;
/// Default offset of MAC's last octet.
static const size_t DHCPV4_RANDOMIZATION_OFFSET = 35;
......@@ -84,55 +85,38 @@ public:
/// Packet template buffers list.
typedef std::vector<TemplateBuffer> TemplateBufferCollection;
/// \brief Socket wrapper class.
///
/// This is wrapper class that holds descriptor of the socket
/// used to run DHCP test. All sockets created with \ref IfaceMgr
/// are closed in the destructor. This ensures that socket is
/// closed when the function that created the socket ends
/// (normally or when exception occurs).
class TestControlSocket {
public:
/// \brief Socket wrapper structure.
///
/// This is the wrapper that holds descriptor of the socket
/// used to run DHCP test. The wrapped socket is closed in
/// the destructor. This prevents resource leaks when when
/// function that created the socket ends (normally or
/// when exception occurs). This structure extends parent
/// structure with new field ifindex_ that holds interface
/// index where socket is bound to.
struct TestControlSocket : public dhcp::IfaceMgr::SocketInfo {
/// Interface index.
uint16_t ifindex_;
/// Is socket valid. It will not be valid if the provided socket
/// descriptor does not point to valid socket.
bool valid_;
/// \brief Constructor of socket wrapper class.
///
/// This constructor uses provided socket descriptor to
/// find the name of the interface where socket has been
/// bound to.
/// bound to. If provided socket descriptor is invalid then
/// valid_ field is set to false;
///
/// \param socket socket descriptor.
/// \throw isc::BadValue if interface for specified
/// socket descriptor does not exist.
TestControlSocket(const int socket);
/// \brief Destriuctor of the socket wrapper class.
///
/// Destructor closes all open sockets on all interfaces.
/// \todo close only the socket being wrapped by this class.
/// Destructor closes wrapped socket.
~TestControlSocket();
/// \brief Return name of the interface where socket is bound to.
///
/// \return name of the interface where socket is bound to.
const std::string& getIface() const { return(iface_); }
/// \brief Return interface index where socket is bound to.
///
/// \return index fo the interface where sockert is bound to.
int getIfIndex() const { return(ifindex_); }
/// \brief Return address where socket is bound to.
///
/// \return address where socket is bound to.
const asiolink::IOAddress& getAddress() const { return(addr_); }
private:
/// \brief Private default constructor.
///
/// Default constructor is private to make sure that valid
/// socket descriptor is passed to create object.
TestControlSocket();
/// \brief Initialize socket data.
///
/// This method initializes members of the class that Interface
......@@ -141,11 +125,6 @@ public:
/// \throw isc::BadValue if interface for specified socket
/// descriptor does not exist.
void initSocketData();
int socket_; ///< Socket descirptor.
std::string iface_; ///< Name of the interface.
int ifindex_; ///< Index of the interface.
asiolink::IOAddress addr_; ///< Address bound.
};
/// \brief Default transaction id generator class.
......@@ -169,6 +148,9 @@ public:
typedef boost::shared_ptr<TransidGenerator> TransidGeneratorPtr;
/// \brief Length of the Ethernet HW address (MAC) in bytes.
///
/// \todo Make this variable length as there are cases when HW
/// address is longer than this (e.g. 20 bytes).
static const uint8_t HW_ETHER_LEN = 6;
/// TestControl is a singleton class. This method returns reference
......@@ -195,22 +177,20 @@ public:
transid_gen_ = generator;
}
protected:
// We would really like these methods and members to be private but
// We would really like following methods and members to be private but
// they have to be accessible for unit-testing. Another, possibly better,
// solution is to make this class friend of test class but this is not
// what's followed in other classes.
protected:
/// \brief Default constructor.
///
/// Default constructor is protected as the object can be created
/// only via \ref instance method.
TestControl();
/// \brief Check if test exit condtitions fulfiled.
/// \brief Check if test exit condtitions fulfilled.
///
/// Method checks if test exit conditions are fulfiled.
/// Method checks if the test exit conditions are fulfiled.
/// Exit conditions are checked periodically from the
/// main loop. Program should break the main loop when
/// this method returns true. It is calling function
......@@ -227,9 +207,10 @@ protected:
/// to length 2 and values will be initialized to zeros. Otherwise
/// function will initialize option buffer with values in passed buffer.
///
/// \param u universe (V6 or V4).
/// \param type option-type.
/// \param buf option-buffer.
/// \param u universe (ignored)
/// \param type option-type (ignored).
/// \param buf option-buffer containing option content (2 bytes) or
/// empty buffer if option content has to be set to default (0) value.
/// \throw if elapsed time buffer size is neither 2 nor 0.
/// \return instance o the option.
static dhcp::OptionPtr
......@@ -244,7 +225,7 @@ protected:
/// the buffer contents, size etc.
///
/// \param u universe (V6 or V4).
/// \param type option-type.
/// \param type option-type (ignored).
/// \param buf option-buffer.
/// \return instance o the option.
static dhcp::OptionPtr factoryGeneric(dhcp::Option::Universe u,
......@@ -257,9 +238,9 @@ protected:
///
/// \todo add support for IA Address options.
///
/// \param u universe (V6 or V4).
/// \param type option-type.
/// \param buf option-buffer.
/// \param u universe (ignored).
/// \param type option-type (ignored).
/// \param buf option-buffer carrying IANA suboptions.
/// \return instance of IA_NA option.
static dhcp::OptionPtr factoryIana6(dhcp::Option::Universe u,
uint16_t type,
......@@ -272,9 +253,9 @@ protected:
/// - D6O_NAME_SERVERS
/// - D6O_DOMAIN_SEARCH
///
/// \param u universe (V6 or V4).
/// \param type option-type.
/// \param buf option-buffer (ignored and should be empty).
/// \param u universe (ignored).
/// \param type option-type (ignored).
/// \param buf option-buffer (ignored).
/// \return instance of ORO option.
static dhcp::OptionPtr
factoryOptionRequestOption6(dhcp::Option::Universe u,
......@@ -287,9 +268,9 @@ protected:
/// The buffer passed to this option must be empty because option does
/// not have any payload.
///
/// \param u universe (V6 or V4).
/// \param type option-type.
/// \param buf option-buffer (ignored and should be empty).
/// \param u universe (ignored).
/// \param type option-type (ignored).
/// \param buf option-buffer (ignored).
/// \return instance of RAPID_COMMIT option..
static dhcp::OptionPtr factoryRapidCommit6(dhcp::Option::Universe u,
uint16_t type,
......@@ -308,9 +289,9 @@ protected:
/// - DHO_DOMAIN_NAME_SERVERS,
/// - DHO_HOST_NAME.
///
/// \param u universe (V6 or V4).
/// \param type option-type.
/// \param buf option-buffer (ignored and should be empty).
/// \param u universe (ignored).
/// \param type option-type (ignored).
/// \param buf option-buffer (ignored).
/// \return instance o the generic option.
static dhcp::OptionPtr factoryRequestList4(dhcp::Option::Universe u,
uint16_t type,
......@@ -319,15 +300,16 @@ protected:
/// \brief Generate DUID.
///
/// Method generates unique DUID. The number of DUIDs it can generate
/// depends on the number of simulated clinets, which is specified
/// depends on the number of simulated clients, which is specified
/// from the command line. It uses \ref CommandOptions object to retrieve
/// number of clinets. Since the last six octets of DUID are constructed
/// number of clients. Since the last six octets of DUID are constructed
/// from the MAC address, this function uses \ref generateMacAddress
/// internally to randomize the DUID.
///
/// \todo add support for other types of DUID.
///
/// \param randomized number of bytes randomized.
/// \param [out] randomized number of bytes randomized (initial value
/// is ignored).
/// \throw isc::BadValue if \ref generateMacAddress throws.
/// \return vector representing DUID.
std::vector<uint8_t> generateDuid(uint8_t& randomized) const;
......@@ -341,7 +323,8 @@ protected:
/// Based on this the random value is generated and added to
/// the MAC address template (default MAC address).
///
/// \param randomized number of bytes randomized.
/// \param [out] randomized number of bytes randomized (initial
/// value is ignored).
/// \throw isc::BadValue if MAC address template (default or specified
/// from the command line) has invalid size (expected 6 octets).
/// \return generated MAC address.
......@@ -349,6 +332,9 @@ protected:
/// \brief generate transaction id.
///
/// Generate transaction id value (32-bit for DHCPv4,
/// 24-bit for DHCPv6).
///
/// \return generated transaction id.
uint32_t generateTransid() {
return(transid_gen_->generate());
......@@ -361,7 +347,7 @@ protected:
/// is based on current time, due time calculated with
/// \ref updateSendTime function and expected rate.
///
/// \return number of exchanges to be started immediatelly.
/// \return number of exchanges to be started immediately.
uint64_t getNextExchangesNum() const;
/// \brief Return template buffer.
......@@ -369,14 +355,15 @@ protected:
/// Method returns template buffer at specified index.
///
/// \param idx index of template buffer.
/// \return reference to template buffer or empty buffer if index
/// is out of bounds.
/// \throw isc::OutOfRange if buffer index out of bounds.
/// \return reference to template buffer.
TemplateBuffer getTemplateBuffer(const size_t idx) const;
/// \brief Reads packet templates from files.
///
/// Method iterates through all specified template files, reads
/// their content and stores it in class internal buffers
/// their content and stores it in class internal buffers. Template
/// file names are specified from the command line with -T option.
///
/// \throw isc::BadValue if any of the template files does not exist
void initPacketTemplates();
......@@ -390,13 +377,13 @@ protected:
/// \brief Open socket to communicate with DHCP server.
///
/// Method opens socket and binds it to local address. Function will
/// can use either interface name, local address or server address
/// use either interface name, local address or server address
/// to create a socket, depending on what is available (specified
/// from the command line). If socket can't be created for any
/// reason, exception is thrown.
/// If destination address is broadcast (for DHCPv4) or multicast
/// (for DHCPv6) than broadcast or multicast option is set on
/// the socket.
/// the socket. Opened socket is registered and managed by IfaceMgr.
///
/// \throw isc::BadValue if socket can't be created for given
/// interface, local address or remote address.
......@@ -432,8 +419,11 @@ protected:
/// when OFFER packet arrives, this function will initiate
/// REQUEST message to the server.
///
/// \param socket socket to be used.
/// \param pkt4 object representing DHCPv4 packet received.
/// \warning this method does not check if provided socket is
/// valid (specifically if v4 socket for received v4 packet).
///
/// \param [in] socket socket to be used.
/// \param [in] pkt4 object representing DHCPv4 packet received.
/// \throw isc::BadValue if unknown message type received.
/// \throw isc::Unexpected if unexpected error occured.
void receivePacket4(const TestControlSocket& socket,
......@@ -446,8 +436,11 @@ protected:
/// when ADVERTISE packet arrives, this function will initiate
/// REQUEST message to the server.
///
/// \param socket socket to be used.
/// \param pkt6 object representing DHCPv6 packet received.
/// \warning this method does not check if provided socket is
/// valid (specifically if v4 socket for received v4 packet).
///
/// \param [in] socket socket to be used.
/// \param [in] pkt6 object representing DHCPv6 packet received.
/// \throw isc::BadValue if unknown message type received.
/// \throw isc::Unexpected if unexpected error occured.
void receivePacket6(const TestControlSocket& socket,
......@@ -460,6 +453,9 @@ protected:
/// \ref receivePacket6 depending if DHCPv4 or DHCPv6 packet
/// has arrived.
///
/// \warning this method does not check if provided socket is
/// valid. Ensure that it is valid prior to calling it.
///
/// \param socket socket to be used.
/// \throw::BadValue if unknown message type received.
/// \throw::Unexpected if unexpected error occured.
......@@ -506,6 +502,8 @@ protected:
/// The transaction id and MAC address are randomly generated for
/// the message. Range of unique MAC addresses generated depends
/// on the number of clients specified from the command line.
/// Copy of sent packet is stored in the stats_mgr4_ object to
/// update statistics.
///
/// \param socket socket to be used to send the message.
/// \param preload preload mode, packets not included in statistics.
......@@ -520,6 +518,8 @@ protected:
/// template data is exepcted to be in binary format. Provided
/// buffer is copied and parts of it are replaced with actual
/// data (e.g. MAC address, transaction id etc.).
/// Copy of sent packet is stored in the stats_mgr4_ object to
/// update statistics.
///