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UdpPinger.cpp
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UdpPinger.cpp
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/**
* Copyright (c) 2016-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#include "UdpPinger.h"
#include <linux/filter.h>
#include <pthread.h>
#include <sys/socket.h>
#include <unistd.h>
#include <chrono>
#include <cmath>
#include <thread>
#include <future>
#include <folly/gen/Base.h>
#include <folly/gen/Core.h>
#include <folly/stats/Histogram-defs.h>
#include <folly/ThreadName.h>
#include <folly/Logging.h>
using namespace std;
using namespace folly;
using folly::gen::as;
using folly::gen::from;
using folly::gen::mapped;
DEFINE_int32(bucket_min, 1e3, "Minimum RTT in us");
DEFINE_int32(bucket_max, 3e5, "Maximum RTT in us");
DEFINE_int32(bucket_size, 5e3, "Bucket size for histograms");
namespace {
using facebook::netnorad::AsyncUDPSocket;
const string kUdp = "udp";
const string kClusterPodDelimiter = "||";
default_random_engine generator;
uniform_int_distribution<uint32_t> distribution(0, INT_MAX);
//
// Get a timestamp and store it in uint32_t object. Note that if the timestamp
// is larger than 32 bit, only the LSBs are recorded, which is useful to
// calculate time difference.
// NOTE: we use non-monitonic clock since kernel time-stamps do not support
// monotonic timer :(
//
template <class T> inline uint32_t getTimestamp() {
return chrono::duration_cast<T>(
chrono::system_clock::now().time_since_epoch())
.count();
}
void addToHistograms(
const uint32_t rtt, const IPAddress &address, const string &cluster,
shared_ptr<unordered_map<IPAddress, facebook::netnorad::Histogram>>
hostHistograms,
shared_ptr<unordered_map<string, facebook::netnorad::Histogram>>
clusterHistograms) {
auto iter = hostHistograms->find(address);
if (iter == hostHistograms->end()) {
facebook::netnorad::Histogram histogram(FLAGS_bucket_size, FLAGS_bucket_min,
FLAGS_bucket_max);
auto result = hostHistograms->emplace(address, std::move(histogram));
iter = result.first;
}
iter->second.addValue(rtt);
if (!cluster.empty()) {
auto clusterIter = clusterHistograms->find(cluster);
if (clusterIter == clusterHistograms->end()) {
facebook::netnorad::Histogram histogram(
FLAGS_bucket_size, FLAGS_bucket_min, FLAGS_bucket_max);
auto result = clusterHistograms->emplace(cluster, std::move(histogram));
clusterIter = result.first;
}
clusterIter->second.addValue(rtt);
}
}
std::pair<string, string> clusterPodSplit(const string &clusterPod) {
std::pair<string, string> result;
if (!folly::split(kClusterPodDelimiter, clusterPod, result.first,
result.second)) {
result.first = clusterPod;
result.second.clear();
}
return result;
}
std::string clusterPodJoin(const std::string &cluster, const std::string &pod) {
auto clusterPod = cluster;
if (!pod.empty()) {
clusterPod += kClusterPodDelimiter + pod;
}
return clusterPod;
}
int pinToCore(int coreId) {
int numCores = ::sysconf(_SC_NPROCESSORS_ONLN);
coreId = coreId % numCores;
cpu_set_t cpuset;
CPU_ZERO(&cpuset);
CPU_SET(coreId, &cpuset);
pthread_t current_thread = pthread_self();
return pthread_setaffinity_np(current_thread, sizeof(cpu_set_t), &cpuset);
}
//
// The following two methods are used for checksum computations
//
inline uint32_t uint16_checksum(uint16_t *data, size_t size) {
uint32_t sum = 0;
while (size >= 2) {
sum += (uint32_t)ntohs(*data);
data++;
size -= 2;
}
if (size == 1) {
sum += (uint32_t)ntohs(*(uint8_t *)data);
}
return sum;
}
uint16_t ipv6UdpCheckSum(uint16_t *data, uint16_t size, struct in6_addr *src,
struct in6_addr *dst, uint8_t proto) {
uint32_t phdr[2];
uint32_t sum = 0;
uint16_t sum2;
sum += uint16_checksum((uint16_t *)(void *)src, 16);
sum += uint16_checksum((uint16_t *)(void *)dst, 16);
phdr[0] = htonl(size);
phdr[1] = htonl(proto);
sum += uint16_checksum((uint16_t *)phdr, 8);
sum += uint16_checksum(data, size);
sum = (sum & 0xFFFF) + (sum >> 16);
sum = (sum & 0xFFFF) + (sum >> 16);
sum2 = htons((uint16_t)sum);
sum2 = ~sum2;
if (sum2 == 0) {
return 0xFFFF;
}
return sum2;
}
//
// Creates a v4 or v6 UDP raw socket
//
int createRawSocket(bool isV4, int qos, int bufferSize) {
int sock;
if (isV4) {
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = 0;
sock = ::socket(AF_INET, SOCK_RAW, IPPROTO_UDP);
if (sock < 0) {
LOG(ERROR) << "Error creating raw v4 socket '" << errnoStr(errno) << "'";
}
if (::bind(sock, reinterpret_cast<struct sockaddr *>(&addr), sizeof(addr)) <
0) {
LOG(ERROR) << "Error binding v4 socket '" << errnoStr(errno) << "'";
}
if (::setsockopt(sock, IPPROTO_IP, IP_TOS, &qos, sizeof(qos)) == -1) {
LOG(ERROR) << "setsockopt IP_TOS failed '" << errnoStr(errno) << "'";
}
} else {
struct sockaddr_in6 addr;
addr.sin6_family = AF_INET6;
addr.sin6_addr = IN6ADDR_ANY_INIT;
addr.sin6_flowinfo = 0;
addr.sin6_port = 0;
sock = ::socket(AF_INET6, SOCK_RAW, IPPROTO_UDP);
if (sock < 0) {
LOG(ERROR) << "Error creating raw v6 socket '" << errnoStr(errno) << "'";
}
if (::bind(sock, reinterpret_cast<struct sockaddr *>(&addr), sizeof(addr)) <
0) {
LOG(ERROR) << "Error binding v6 socket '" << errnoStr(errno) << "'";
}
if (::setsockopt(sock, IPPROTO_IPV6, IPV6_TCLASS, &qos, sizeof(qos)) ==
-1) {
LOG(ERROR) << "UdpWorker: setsockopt IPV6_TCLASS failed '"
<< errnoStr(errno) << "'";
}
}
// this is 'ret 0' BPF instruction - discard all packets
struct sock_filter code[] = {
{0x06, 0, 0, 0x00000000},
};
struct sock_fprog bpf = {
.len = sizeof(code) / sizeof(code[0]), .filter = code,
};
if (::setsockopt(sock, SOL_SOCKET, SO_ATTACH_FILTER, &bpf, sizeof(bpf)) < 0) {
LOG(ERROR) << "Cannot assign BPF filter to send socket";
}
if (bufferSize) {
LOG(INFO) << "Setting raw socket buffer to " << bufferSize;
if (::setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &bufferSize,
sizeof(bufferSize)) == -1) {
LOG(ERROR) << "Raw Socket: setsockopt SO_SNDBUF failed '"
<< errnoStr(errno) << "'";
}
int optval;
socklen_t optlen;
optlen = sizeof(optval);
::getsockopt(sock, SOL_SOCKET, SO_SNDBUF, &optval, &optlen);
LOG(INFO) << "Raw socket: getsockopt SO_SNDBUF returned '" << optval << "'";
}
return sock;
}
//
// Creates and binds UDP sockets for receiving, reports
// the local ports that could not be bound
//
pair<vector<shared_ptr<AsyncUDPSocket>> /* sockets */,
set<int> /* missing ports */>
createUdpSockets(EventBase *evb, bool isV4, int basePort, int portCount,
int bufferSize, AsyncUDPSocket::ReadCallback *cob) {
CHECK(evb) << "Event base can't be null";
std::vector<std::shared_ptr<AsyncUDPSocket>> sockets;
std::set<int> missingPorts;
// create N sockets and try binding them to successive ports
// if this fails, use random port
for (int i = 0; i < portCount; ++i) {
sockets.emplace_back(make_shared<AsyncUDPSocket>(evb));
auto &socket = sockets.back();
socket->setReusePort(true);
if (isV4) {
try {
socket->bind(SocketAddress("0.0.0.0", basePort + i));
} catch (folly::AsyncSocketException const &e) {
missingPorts.emplace(basePort + i);
continue;
}
} else {
try {
socket->bind(SocketAddress("::", basePort + i));
} catch (folly::AsyncSocketException const &e) {
missingPorts.emplace(basePort + i);
continue;
}
}
// enable timestamping for this socket
int enabled = 1;
if (::setsockopt(socket->getFD(), SOL_SOCKET, SO_TIMESTAMPNS, &enabled,
sizeof(enabled)) < 0) {
LOG(ERROR) << "UdpWorker: setsockopt SO_TIMESTAMPNS failed '"
<< errnoStr(errno) << "'";
}
if (bufferSize) {
if (::setsockopt(socket->getFD(), SOL_SOCKET, SO_RCVBUF, &bufferSize,
sizeof(bufferSize)) == -1) {
LOG(ERROR) << "UdpWorker: setsockopt SO_RCVBUF failed '"
<< errnoStr(errno) << "'";
}
int optval;
socklen_t optlen;
optlen = sizeof(optval);
::getsockopt(socket->getFD(), SOL_SOCKET, SO_RCVBUF, &optval, &optlen);
if (2 * bufferSize != optval) {
LOG(WARNING) << "Udp socket: getsockopt SO_RCVBUF returned '" << optval
<< "'"
<< " when requested " << bufferSize;
}
}
if (cob) {
socket->resumeRead(cob);
}
}
return make_pair(sockets, missingPorts);
}
}
namespace facebook {
namespace netnorad {
//
// UdpReceiver
//
void UdpReceiver::waitForSocketsToBind() {
// busy wait for variable to be setp
while (!socketsAreBound_) {
std::this_thread::yield();
}
}
UdpReceiver::UdpReceiver(
const thrift::Config &config, uint32_t signature, int receiverId,
std::vector<std::shared_ptr<folly::NotificationQueue<ReceiveProbe>>>
recvQueues,
const std::unordered_map<folly::IPAddress, thrift::Target> &ipToTargetMap,
const std::unordered_map<std::string, std::string> &clusterToClusterTypeMap)
: config_(config), signature_(signature), receiverId_(receiverId),
recvQueues_(recvQueues), ipToTargetMap_(ipToTargetMap),
clusterToClusterTypeMap_(clusterToClusterTypeMap),
hostHistogramsV4_(make_shared<unordered_map<IPAddress, Histogram>>()),
clusterHistogramsV4_(make_shared<unordered_map<string, Histogram>>()),
hostHistogramsV6_(make_shared<unordered_map<IPAddress, Histogram>>()),
clusterHistogramsV6_(make_shared<unordered_map<string, Histogram>>()) {
// wipe out message header first
memset(&msg_, 0, sizeof(msg_));
// we only expect to receive one block of data, single entry
// in the vector
msg_.msg_iov = &entry_;
msg_.msg_iovlen = 1;
entry_.iov_base = readBuf_;
entry_.iov_len = sizeof(readBuf_);
// control message buffer used to receive time-stamps from
// the kernel
msg_.msg_control = ctrlBuf_;
msg_.msg_controllen = sizeof(ctrlBuf_);
// prepare to receive either v4 or v6 addresses
::memset(&addrStorage_, 0, sizeof(addrStorage_));
msg_.msg_name = &addrStorage_;
msg_.msg_namelen = sizeof(sockaddr_storage);
}
void UdpReceiver::run(int qos) {
// the below won't be used in receiving thread, they are a byproduct of
// the createUdpSockets function
set<int> _missingPortsV4, _missingPortsV6;
// create the sockets we'll be listening on
tie(socketsV4_, _missingPortsV4) = createUdpSockets(
&evb_, true /* is v4 */, config_.base_src_port, config_.src_port_count,
config_.socket_buffer_size /* buff size */, this /* cob */);
tie(socketsV6_, _missingPortsV6) = createUdpSockets(
&evb_, false /* is v4 */, config_.base_src_port, config_.src_port_count,
config_.socket_buffer_size /* buff size */, this /* cob */);
socketsAreBound_ = true;
receivingConsumer_ = NotificationQueue<ReceiveProbe>::Consumer::make([this](
ReceiveProbe && msg) noexcept {
consumeMessage(forward<ReceiveProbe>(msg));
});
receivingConsumer_->startConsuming(&evb_, recvQueues_[receiverId_].get());
// this will loop until stopped explicitly by an external caller
evb_.loopForever();
// aggregate the stats that we have accumulated
summarizeResults(qos);
}
void UdpReceiver::stop() {
evb_.runInEventBaseThread([&] {
closeSockets();
receivingConsumer_->stopConsuming();
evb_.terminateLoopSoon();
});
}
const UdpTestResults &UdpReceiver::getResults() { return results_; }
void UdpReceiver::summarizeResults(int qos) {
LOG(INFO) << "UDP receiver starting result summarization";
CHECK(!evb_.isRunning());
uint32_t now =
std::chrono::system_clock::to_time_t(std::chrono::system_clock::now());
for (const auto &iter : *hostHistogramsV4_) {
auto result = make_shared<thrift::TestResult>();
result->timestamp = now;
result->aggregated = false;
result->metadata.ipv6 = false;
result->metadata.proto = kUdp;
result->metadata.tos = qos;
try {
const auto &target = ipToTargetMap_.at(iter.first);
result->ignore = config_.ignore_my_samples | target.ignore;
result->metadata.dst.cluster = target.cluster;
result->metadata.dst.clustertype = target.clustertype;
result->metadata.dst.pod = target.pod;
result->metadata.dst.rack = target.cluster + ":" + target.rack;
result->metadata.dst.hostname = target.hostname;
result->metadata.dst.ip = target.v4;
} catch (const out_of_range &e) {
// We receive some packets that were not in our test plan
VLOG(1) << "Received unexpected packet from " << iter.first;
continue;
}
const auto &histogram = iter.second;
result->metrics.numRecv = histogram.computeTotalCount();
// The result metrics is in ms.
result->metrics.rttP50 =
(double)histogram.getPercentileEstimate(0.5) / 1000;
result->metrics.rttP90 =
(double)histogram.getPercentileEstimate(0.9) / 1000;
result->metrics.avg = histogram.getAverage() / 1000;
results_.hostResults.push_back(std::move(result));
}
hostHistogramsV4_->clear();
for (const auto &iter : *hostHistogramsV6_) {
auto result = make_shared<thrift::TestResult>();
result->timestamp = now;
result->aggregated = false;
result->metadata.ipv6 = true;
result->metadata.proto = kUdp;
result->metadata.tos = qos;
try {
const auto &target = ipToTargetMap_.at(iter.first);
result->ignore = config_.ignore_my_samples | target.ignore;
result->metadata.dst.cluster = target.cluster;
result->metadata.dst.clustertype = target.clustertype;
result->metadata.dst.pod = target.pod;
result->metadata.dst.rack = target.cluster + ":" + target.rack;
result->metadata.dst.hostname = target.hostname;
result->metadata.dst.ip = target.v6;
} catch (const out_of_range &e) {
// We receive some packets that were not in our test plan
VLOG(1) << "Received unexpected packet from " << iter.first;
continue;
}
const auto &histogram = iter.second;
result->metrics.numRecv = histogram.computeTotalCount();
// The result metrics is in ms.
result->metrics.rttP50 =
(double)histogram.getPercentileEstimate(0.5) / 1000;
result->metrics.rttP90 =
(double)histogram.getPercentileEstimate(0.9) / 1000;
result->metrics.avg = histogram.getAverage() / 1000;
results_.hostResults.push_back(std::move(result));
}
hostHistogramsV6_->clear();
for (const auto &iter : *clusterHistogramsV4_) {
auto result = make_shared<thrift::TestResult>();
result->timestamp = now;
result->ignore = config_.ignore_my_samples;
result->aggregated = true;
result->metadata.ipv6 = false;
result->metadata.proto = "udp";
result->metadata.tos = qos;
auto clusterPod = clusterPodSplit(iter.first);
result->metadata.dst.cluster = clusterPod.first;
result->metadata.dst.clustertype =
clusterToClusterTypeMap_.at(clusterPod.first);
result->metadata.dst.pod = clusterPod.second;
const auto &histogram = iter.second;
result->metrics.numRecv = histogram.computeTotalCount();
// The result metrics is in ms.
result->metrics.rttP50 =
(double)histogram.getPercentileEstimate(0.5) / 1000;
result->metrics.rttP90 =
(double)histogram.getPercentileEstimate(0.9) / 1000;
result->metrics.avg = histogram.getAverage() / 1000;
results_.clusterResults.push_back(std::move(result));
}
clusterHistogramsV4_->clear();
for (const auto &iter : *clusterHistogramsV6_) {
auto result = make_shared<thrift::TestResult>();
result->timestamp = now;
result->ignore = config_.ignore_my_samples;
result->aggregated = true;
result->metadata.ipv6 = true;
result->metadata.proto = "udp";
result->metadata.tos = qos;
auto clusterPod = clusterPodSplit(iter.first);
result->metadata.dst.cluster = clusterPod.first;
result->metadata.dst.clustertype =
clusterToClusterTypeMap_.at(clusterPod.first);
result->metadata.dst.pod = clusterPod.second;
const auto &histogram = iter.second;
result->metrics.numRecv = histogram.computeTotalCount();
// The result metrics is in ms.
result->metrics.rttP50 =
(double)histogram.getPercentileEstimate(0.5) / 1000;
result->metrics.rttP90 =
(double)histogram.getPercentileEstimate(0.9) / 1000;
result->metrics.avg = histogram.getAverage() / 1000;
results_.clusterResults.push_back(std::move(result));
}
clusterHistogramsV6_->clear();
LOG(INFO) << "Receiver done summarizing results";
LOG(INFO) << "Built partial results host size " << results_.hostResults.size()
<< " cluster size " << results_.clusterResults.size();
}
void UdpReceiver::consumeMessage(ReceiveProbe &&message) noexcept {
const auto rtt = message.rtt;
auto address = message.remoteAddress.getIPAddress();
auto targetIter = ipToTargetMap_.find(address);
if (targetIter != ipToTargetMap_.end()) {
auto clusterPod =
clusterPodJoin(targetIter->second.cluster, targetIter->second.pod);
if (address.isV4()) {
addToHistograms(rtt, address, clusterPod, hostHistogramsV4_,
clusterHistogramsV4_);
} else {
addToHistograms(rtt, address, clusterPod, hostHistogramsV6_,
clusterHistogramsV6_);
}
} else {
FB_LOG_EVERY_MS(ERROR, 100) << "Received unexpected packet from "
<< address;
}
}
void UdpReceiver::closeSockets() {
for (auto &socket : socketsV4_) {
socket->pauseRead();
socket->close();
}
for (auto &socket : socketsV6_) {
socket->pauseRead();
socket->close();
}
socketsV4_.clear();
socketsV6_.clear();
}
//
// UdpReceiver: AsyncUDPCallback methods
//
void UdpReceiver::getMessageHeader(struct msghdr **msg) noexcept {
::memset(&addrStorage_, 0, sizeof(addrStorage_));
msg_.msg_namelen = sizeof(sockaddr_storage);
*msg = &msg_;
}
void UdpReceiver::onMessageAvailable(size_t len) noexcept {
uint32_t now = getTimestamp<chrono::microseconds>();
folly::SocketAddress addr;
addr.setFromSockaddr(reinterpret_cast<sockaddr *>(&addrStorage_),
sizeof(addrStorage_));
if (msg_.msg_flags & MSG_TRUNC) {
LOG(ERROR) << "UdpReadCallback: Dropping truncated data packet from "
<< addr;
return;
}
if (len < kNoradProbeDataLen) {
LOG(ERROR) << "UdpReadCallback: Received malformed packet";
return;
}
// get the kernel timestamp
struct cmsghdr *cmsg;
struct timespec *stamp{nullptr};
for (cmsg = CMSG_FIRSTHDR(&msg_); cmsg; cmsg = CMSG_NXTHDR(&msg_, cmsg)) {
switch (cmsg->cmsg_level) {
case SOL_SOCKET:
switch (cmsg->cmsg_type) {
case SO_TIMESTAMPNS: {
stamp = (struct timespec *)CMSG_DATA(cmsg);
break;
}
}
}
} // for
// set to the same as now if kernel timestamp is not supported
uint32_t recvTs = now;
if (stamp) {
// the kernel receive time-stamp
recvTs = stamp->tv_nsec / 1000 + stamp->tv_sec * 1000000;
}
ReceiveProbe probe;
probe.remoteAddress = addr;
NoradProbeBody probeBody;
::memcpy(&probeBody, readBuf_, sizeof(probeBody));
auto signature = ntohl(probeBody.signature);
if (signature != signature_) {
// Bogus packet
LOG(ERROR) << "Signature mismatched in packet from " << addr;
return;
}
// how large is the adjustment on receive side. Used only for logging
uint32_t adjPinger = now - recvTs;
// how much to adjust RTT based on target-collected timestamps
// we use this data to compensate for wait time in the target process
uint32_t adjTarget =
(ntohl(probeBody.targetRespTime) - ntohl(probeBody.targetRcvdTime));
probe.rtt = recvTs - ntohl(probeBody.pingerSentTime) - adjTarget;
// ucomment if needed for debugging purposes - log the RTT adjustments
FB_LOG_EVERY_MS(INFO, 1000) << folly::sformat(
"Measured RTT {} usec for addr {}, adjustement by pinger {}, adjustment "
"by target {}",
probe.rtt, addr.describe(), adjPinger, adjTarget);
string cluster;
try {
cluster = ipToTargetMap_.at(addr.getIPAddress()).cluster;
} catch (std::out_of_range const &e) {
FB_LOG_EVERY_MS(ERROR, 500) << "Response from unknown IP address "
<< addr.getIPAddress();
return;
}
auto it = clusterToQueueId_.find(cluster);
int queueId;
if (it == clusterToQueueId_.end()) {
queueId = hasher_(cluster) % recvQueues_.size();
clusterToQueueId_.emplace(std::move(cluster), queueId);
} else {
queueId = it->second;
}
// shortcut and bypass NotificationQueue, since this is for ourselves
if (queueId == receiverId_) {
consumeMessage(std::move(probe));
} else {
auto result = recvQueues_[queueId]->tryPutMessageNoThrow(std::move(probe));
if (!result) {
LOG(ERROR) << "Failed to enqueue packet from " << addr;
}
}
}
//
// UdpSender
//
UdpSender::UdpSender(
const thrift::Config &config, int qos, int senderId, int numSenders,
uint32_t signature, folly::IPAddress srcV4, folly::IPAddress srcV6,
const set<int> &missingPortsV4, const set<int> &missingPortsV6,
std::shared_ptr<folly::NotificationQueue<UdpTestPlan>> inputQueue)
: config_(config), qos_(qos), senderId_(senderId), numSenders_(numSenders),
signature_(signature), srcV4_(srcV4), srcV6_(srcV6),
missingPortsV4_(missingPortsV4), missingPortsV6_(missingPortsV6),
inputQueue_(std::move(inputQueue)) {}
void UdpSender::run() {
socketV4_ = createRawSocket(true /* is v4 */, qos_,
config_.socket_buffer_size /* buff size */);
socketV6_ = createRawSocket(false /* is v4 */, qos_,
config_.socket_buffer_size /* buff size */);
// this guy will drain our input queue
prepareConsumer();
CHECK(sendingConsumer_);
sendingConsumer_->startConsuming(&evb_, inputQueue_.get());
// this will run out pinging loop
evb_.loopForever();
closeSockets();
LOG(INFO) << "UdpSender " << senderId_ << " finished the run loop";
}
void UdpSender::buildAddressMap() {
for (auto &tp : testPlans_) {
if (!tp.target.v4.empty()) {
// target address to send to
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = 0;
if (::inet_pton(AF_INET, tp.target.v4.c_str(), &addr.sin_addr.s_addr) <
0) {
LOG(ERROR) << "Malformed v4 address " << tp.target.v4;
}
auto &mappedAddr = addressMap_[tp.target.v4];
::memcpy(&mappedAddr, &addr, sizeof(addr));
}
if (!tp.target.v6.empty()) {
// target address to send to
struct sockaddr_in6 addr;
addr.sin6_family = AF_INET6;
addr.sin6_port = 0;
if (::inet_pton(AF_INET6, tp.target.v6.c_str(), &addr.sin6_addr.s6_addr) <
0) {
LOG(ERROR) << "Malformed v6 address " << tp.target.v6;
}
auto &mappedAddr = addressMap_[tp.target.v6];
::memcpy(&mappedAddr, &addr, sizeof(addr));
}
}
}
void UdpSender::prepareConsumer() {
sendingConsumer_ = NotificationQueue<UdpTestPlan>::Consumer::make([this](
UdpTestPlan && testPlan) noexcept {
// enqueue test-plans until we receive the signal to start probing
if (testPlan.numPackets != 0) {
testPlans_.push_back(std::move(testPlan));
return;
}
sendingConsumer_->stopConsuming();
buildAddressMap();
pingAllTargets();
evb_.runAfterDelay([this]() noexcept { evb_.terminateLoopSoon(); },
config_.pinger_cooldown_time * 1000 /* in ms */
);
});
}
void UdpSender::pingAllTargets() {
LOG(INFO) << "Worker " << senderId_ << " preparing to ping "
<< testPlans_.size() << " targets";
// ranges of source ports we can use
// we add the full allowed range except for
// the ports that receivers could not bind to
vector<int> srcPortsV4;
vector<int> srcPortsV6;
for (int port = config_.base_src_port;
port < config_.base_src_port + config_.src_port_count; port++) {
if (missingPortsV4_.find(port) != missingPortsV4_.end()) {
continue;
}
srcPortsV4.push_back(port);
}
for (int port = config_.base_src_port;
port < config_.base_src_port + config_.src_port_count; port++) {
if (missingPortsV6_.find(port) != missingPortsV6_.end()) {
continue;
}
srcPortsV6.push_back(port);
}
// some people bind all UDP ports in our range... weirdos
bool v4Enabled = !srcV4_.isLoopback() && srcPortsV4.size();
bool v6Enabled = !srcV6_.isLoopback() && srcPortsV6.size();
while (true) {
bool done = true;
// we want to measure how long a full swing takes
auto start = std::chrono::high_resolution_clock::now();
// how many packets we sent in a single sweep - needed
// for delay loop calibration
int packetsSent = 0;
int sendFailed = 0;
NoradProbeBody *probeBody;
UdpHeader *udpHeader;
// we'll be updating counters inside testPlan, hence reference
// this loop walks over all targets and sees if we need to send
// packets for each one in turn. This effectively allow for very
// broad "sweeps" over all targets, without sending large burts
// to a single target
for (auto &tp : testPlans_) {
if (v4Enabled && !tp.target.v4.empty() &&
(tp.packetsSentV4 < tp.numPackets)) {
done = false;
// target address to send to
auto &addr = addressMap_[tp.target.v4];
::memset(&buf_[0], 0, sizeof(buf_));
udpHeader = reinterpret_cast<UdpHeader *>(&buf_[0]);
udpHeader->srcPort =
htons(srcPortsV4[tp.packetsSentV4++ % srcPortsV4.size()]);
udpHeader->dstPort = htons(config_.pinger_target_port);
udpHeader->length = htons(sizeof(UdpHeader) + sizeof(NoradProbeBody));
probeBody =
reinterpret_cast<NoradProbeBody *>(&buf_[sizeof(UdpHeader)]);
probeBody->signature = htonl(signature_);
probeBody->pingerSentTime = htonl(getTimestamp<chrono::microseconds>());
probeBody->tclass = qos_;
if (::sendto(socketV4_, &buf_[0], sizeof(buf_), MSG_DONTWAIT,
reinterpret_cast<struct sockaddr *>(&addr),
sizeof(struct sockaddr_in)) == -1) {
// if we can try again, de-count the packet, so we can
// retry sending later
if (errno == EAGAIN) {
--tp.packetsSentV4;
} else {
FB_LOG_EVERY_MS(ERROR, 1000) << "UdpSender: v4 write error '"
<< errnoStr(errno) << "'";
sendFailed++;
}
} else {
packetsSent++;
}
}
if (v6Enabled && !tp.target.v6.empty() &&
(tp.packetsSentV6 < tp.numPackets)) {
done = false;
// target address to send to
auto &addr = addressMap_[tp.target.v6];
::memset(&buf_[0], 0, sizeof(buf_));
udpHeader = reinterpret_cast<UdpHeader *>(&buf_[0]);
probeBody =
reinterpret_cast<NoradProbeBody *>(&buf_[sizeof(UdpHeader)]);
udpHeader->srcPort =
htons(srcPortsV6[tp.packetsSentV6++ % srcPortsV6.size()]);
udpHeader->dstPort = htons(config_.pinger_target_port);
udpHeader->length = htons(sizeof(UdpHeader) + sizeof(NoradProbeBody));
probeBody->signature = htonl(signature_);
probeBody->pingerSentTime = htonl(getTimestamp<chrono::microseconds>());
probeBody->tclass = qos_;
struct in6_addr srcAddr =
*reinterpret_cast<const struct in6_addr *>(srcV6_.bytes());
udpHeader->checkSum = ipv6UdpCheckSum(
reinterpret_cast<uint16_t *>(&buf_[0]), sizeof(buf_), &srcAddr,
&((reinterpret_cast<struct sockaddr_in6 *>(&addr))->sin6_addr),
IPPROTO_UDP);
if (::sendto(socketV6_, &buf_[0], sizeof(buf_), MSG_DONTWAIT,
reinterpret_cast<struct sockaddr *>(&addr),
sizeof(struct sockaddr_in6)) == -1) {
// if we can try again, de-count the packet, so we can
// retry sending later
if (errno == EAGAIN) {
FB_LOG_EVERY_MS(INFO, 1000) << "EAGAIN in v6 sendto";
--tp.packetsSentV6;
} else {
sendFailed++;
FB_LOG_EVERY_MS(ERROR, 1000) << "UdpSender: v6 write error '"
<< errnoStr(errno) << "'";
}
} else {
packetsSent++;
}
}
}
auto finish = std::chrono::high_resolution_clock::now();
if (sendFailed) {
LOG(ERROR) << "Failed sending " << sendFailed << " out of "
<< packetsSent + sendFailed << " packets";
}
if (done) {
break;
}
auto elapsed =
std::chrono::duration_cast<std::chrono::microseconds>(finish - start);
// the pps we achieved in this sweep
double pps = std::ceil((1000000.0 / elapsed.count()) * packetsSent);
FB_LOG_EVERY_MS(INFO, 1000)
<< "Ping sweep took: " << elapsed.count() << " usec, sent "
<< packetsSent << " packets, pps was " << pps << " target pps is "
<< config_.pinger_rate / numSenders_;
// wait to hit the desired pps goal
if (pps > config_.pinger_rate / numSenders_) {
double delay = std::ceil(numSenders_ * packetsSent * 1000000.0 /
config_.pinger_rate);
auto delayUsec =
std::chrono::microseconds(folly::to<int64_t>(delay)) - elapsed;
FB_LOG_EVERY_MS(INFO, 1000) << "Sleeping for " << delayUsec.count()
<< " usecs";
/* sleep override */
std::this_thread::sleep_for(delayUsec);
}
} // while
LOG(INFO) << "Sender " << senderId_
<< " sent all probes, waiting for responses for "
<< config_.pinger_cooldown_time << " seconds";
}
void UdpSender::closeSockets() {
::close(socketV4_);
::close(socketV6_);
}
//
// UdpPinger
//
UdpPinger::UdpPinger(const thrift::Config &config, IPAddress srcV4,
IPAddress srcV6)
: config_(config), srcV4_(srcV4), srcV6_(srcV6) {}
UdpTestResults UdpPinger::run(const vector<UdpTestPlan> &testPlans, int qos) {
UdpTestResults results;
int numCores = ::sysconf(_SC_NPROCESSORS_ONLN);
auto numSenders = (int)config_.pinger_sender_threads;
auto numReceivers = (int)config_.pinger_receiver_threads;
LOG(INFO) << "UdpPinger for QoS " << qos << " and pps " << config_.pinger_rate
<< " starting with " << numSenders << " senders and "
<< numReceivers << " receivers";
// the signature value that we'll be using for this pinger run
uint32_t signature = distribution(generator);
//
// Pre-bind the UDP sockets to find any "blocked" source ports
//
// this won't be really used, only needed to create sockets
EventBase _evb;
vector<shared_ptr<AsyncUDPSocket>> _socketsV4, _socketsV6;
set<int> missingPortsV4, missingPortsV6;
tie(_socketsV4, missingPortsV4) = createUdpSockets(
&_evb, true /* is v4 */, config_.base_src_port, config_.src_port_count,
config_.socket_buffer_size /* buff size */, nullptr /* cob */);
if (missingPortsV4.size()) {
LOG(WARNING) << "IPv4: could not bind UDP ports "
<< sformat(join(",", from(missingPortsV4) |
mapped([](int port) {
return to<string>(port);
}) |
as<vector>()));
}
tie(_socketsV6, missingPortsV6) = createUdpSockets(
&_evb, false /* is v4 */, config_.base_src_port, config_.src_port_count,
config_.socket_buffer_size /* buff size */, nullptr /* cob */);