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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=4 sw=2 sts=2 et cin: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
// HttpLog.h should generally be included first
#include "HttpLog.h"
// Log on level :5, instead of default :4.
#undef LOG
#define LOG(args) LOG5(args)
#undef LOG_ENABLED
#define LOG_ENABLED() LOG5_ENABLED()
#define TLS_EARLY_DATA_NOT_AVAILABLE 0
#define TLS_EARLY_DATA_AVAILABLE_BUT_NOT_USED 1
#define TLS_EARLY_DATA_AVAILABLE_AND_USED 2
#include "ASpdySession.h"
#include "mozilla/StaticPrefs_network.h"
#include "mozilla/Telemetry.h"
#include "HttpConnectionUDP.h"
#include "nsHttpHandler.h"
#include "Http3Session.h"
#include "nsComponentManagerUtils.h"
#include "nsISocketProvider.h"
#include "nsNetAddr.h"
#include "nsINetAddr.h"
namespace mozilla {
namespace net {
//-----------------------------------------------------------------------------
// HttpConnectionUDP <public>
//-----------------------------------------------------------------------------
HttpConnectionUDP::HttpConnectionUDP() : mHttpHandler(gHttpHandler) {
LOG(("Creating HttpConnectionUDP @%p\n", this));
}
HttpConnectionUDP::~HttpConnectionUDP() {
LOG(("Destroying HttpConnectionUDP @%p\n", this));
if (mForceSendTimer) {
mForceSendTimer->Cancel();
mForceSendTimer = nullptr;
}
}
nsresult HttpConnectionUDP::Init(nsHttpConnectionInfo* info,
nsIDNSRecord* dnsRecord, nsresult status,
nsIInterfaceRequestor* callbacks,
uint32_t caps) {
LOG1(("HttpConnectionUDP::Init this=%p", this));
NS_ENSURE_ARG_POINTER(info);
NS_ENSURE_TRUE(!mConnInfo, NS_ERROR_ALREADY_INITIALIZED);
mConnInfo = info;
MOZ_ASSERT(mConnInfo);
MOZ_ASSERT(mConnInfo->IsHttp3());
mErrorBeforeConnect = status;
mAlpnToken = mConnInfo->GetNPNToken();
if (NS_FAILED(mErrorBeforeConnect)) {
// See explanation for non-strictness of this operation in
// SetSecurityCallbacks.
mCallbacks = new nsMainThreadPtrHolder<nsIInterfaceRequestor>(
"HttpConnectionUDP::mCallbacks", callbacks, false);
SetCloseReason(ToCloseReason(mErrorBeforeConnect));
return mErrorBeforeConnect;
}
nsCOMPtr<nsIDNSAddrRecord> dnsAddrRecord = do_QueryInterface(dnsRecord);
if (!dnsAddrRecord) {
return NS_ERROR_FAILURE;
}
dnsAddrRecord->IsTRR(&mResolvedByTRR);
dnsAddrRecord->GetEffectiveTRRMode(&mEffectiveTRRMode);
dnsAddrRecord->GetTrrSkipReason(&mTRRSkipReason);
NetAddr peerAddr;
nsresult rv = dnsAddrRecord->GetNextAddr(mConnInfo->GetRoutedHost().IsEmpty()
? mConnInfo->OriginPort()
: mConnInfo->RoutedPort(),
&peerAddr);
if (NS_FAILED(rv)) {
return rv;
}
mSocket = do_CreateInstance("@mozilla.org/network/udp-socket;1", &rv);
if (NS_FAILED(rv)) {
return rv;
}
// We need an address here so that we can convey the IP version of the
// socket.
NetAddr local;
memset(&local, 0, sizeof(local));
local.raw.family = peerAddr.raw.family;
rv = mSocket->InitWithAddress(&local, nullptr, false, 1);
if (NS_FAILED(rv)) {
mSocket = nullptr;
return rv;
}
rv = mSocket->SetRecvBufferSize(
StaticPrefs::network_http_http3_recvBufferSize());
if (NS_FAILED(rv)) {
LOG(("HttpConnectionUDP::Init SetRecvBufferSize failed %d [this=%p]",
static_cast<uint32_t>(rv), this));
mSocket->Close();
mSocket = nullptr;
return rv;
}
if (peerAddr.raw.family == AF_INET) {
rv = mSocket->SetDontFragment(true);
if (NS_FAILED(rv)) {
LOG(("HttpConnectionUDP::Init SetDontFragment failed %d [this=%p]",
static_cast<uint32_t>(rv), this));
}
}
// get the resulting socket address.
rv = mSocket->GetLocalAddr(getter_AddRefs(mSelfAddr));
if (NS_FAILED(rv)) {
mSocket->Close();
mSocket = nullptr;
return rv;
}
uint32_t controlFlags = 0;
if (caps & NS_HTTP_LOAD_ANONYMOUS) {
controlFlags |= nsISocketProvider::ANONYMOUS_CONNECT;
}
if (mConnInfo->GetPrivate()) {
controlFlags |= nsISocketProvider::NO_PERMANENT_STORAGE;
}
if (((caps & NS_HTTP_BE_CONSERVATIVE) || mConnInfo->GetBeConservative()) &&
gHttpHandler->ConnMgr()->BeConservativeIfProxied(
mConnInfo->ProxyInfo())) {
controlFlags |= nsISocketProvider::BE_CONSERVATIVE;
}
if (mResolvedByTRR) {
controlFlags |= nsISocketProvider::USED_PRIVATE_DNS;
}
mPeerAddr = new nsNetAddr(&peerAddr);
mHttp3Session = new Http3Session();
rv = mHttp3Session->Init(mConnInfo, mSelfAddr, mPeerAddr, this, controlFlags,
callbacks);
if (NS_FAILED(rv)) {
LOG(
("HttpConnectionUDP::Init mHttp3Session->Init failed "
"[this=%p rv=%x]\n",
this, static_cast<uint32_t>(rv)));
mSocket->Close();
mSocket = nullptr;
mHttp3Session = nullptr;
return rv;
}
ChangeConnectionState(ConnectionState::INITED);
// See explanation for non-strictness of this operation in
// SetSecurityCallbacks.
mCallbacks = new nsMainThreadPtrHolder<nsIInterfaceRequestor>(
"HttpConnectionUDP::mCallbacks", callbacks, false);
// Call SyncListen at the end of this function. This call will actually
// attach the sockte to SocketTransportService.
rv = mSocket->SyncListen(this);
if (NS_FAILED(rv)) {
mSocket->Close();
mSocket = nullptr;
return rv;
}
return NS_OK;
}
// called on the socket thread
nsresult HttpConnectionUDP::Activate(nsAHttpTransaction* trans, uint32_t caps,
int32_t pri) {
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
LOG1(("HttpConnectionUDP::Activate [this=%p trans=%p caps=%x]\n", this, trans,
caps));
if (!mExperienced && !trans->IsNullTransaction()) {
mHasFirstHttpTransaction = true;
// For QUIC we have HttpConnecitonUDP before the actual connection
// has been establish so wait for TLS handshake to be finished before
// we mark the connection 'experienced'.
if (!mExperienced && mHttp3Session && mHttp3Session->IsConnected()) {
mExperienced = true;
}
if (mBootstrappedTimingsSet) {
mBootstrappedTimingsSet = false;
nsHttpTransaction* hTrans = trans->QueryHttpTransaction();
if (hTrans) {
hTrans->BootstrapTimings(mBootstrappedTimings);
}
}
mBootstrappedTimings = TimingStruct();
}
mTransactionCaps = caps;
mPriority = pri;
NS_ENSURE_ARG_POINTER(trans);
// Connection failures are Activated() just like regular transacions.
// If we don't have a confirmation of a connected socket then test it
// with a write() to get relevant error code.
if (NS_FAILED(mErrorBeforeConnect)) {
CloseTransaction(nullptr, mErrorBeforeConnect);
trans->Close(mErrorBeforeConnect);
gHttpHandler->ExcludeHttp3(mConnInfo);
return mErrorBeforeConnect;
}
if (!mHttp3Session->AddStream(trans, pri, mCallbacks)) {
MOZ_ASSERT(false); // this cannot happen!
trans->Close(NS_ERROR_ABORT);
return NS_ERROR_FAILURE;
}
if (mHasFirstHttpTransaction && mExperienced) {
mHasFirstHttpTransaction = false;
mExperienceState |= ConnectionExperienceState::Experienced;
}
Unused << ResumeSend();
return NS_OK;
}
void HttpConnectionUDP::Close(nsresult reason, bool aIsShutdown) {
LOG(("HttpConnectionUDP::Close [this=%p reason=%" PRIx32 "]\n", this,
static_cast<uint32_t>(reason)));
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
if (mConnectionState != ConnectionState::CLOSED) {
RecordConnectionCloseTelemetry(reason);
ChangeConnectionState(ConnectionState::CLOSED);
}
if (mForceSendTimer) {
mForceSendTimer->Cancel();
mForceSendTimer = nullptr;
}
if (!mTrafficCategory.IsEmpty()) {
HttpTrafficAnalyzer* hta = gHttpHandler->GetHttpTrafficAnalyzer();
if (hta) {
hta->IncrementHttpConnection(std::move(mTrafficCategory));
MOZ_ASSERT(mTrafficCategory.IsEmpty());
}
}
if (mSocket) {
mSocket->Close();
mSocket = nullptr;
}
}
void HttpConnectionUDP::DontReuse() {
LOG(("HttpConnectionUDP::DontReuse %p http3session=%p\n", this,
mHttp3Session.get()));
mDontReuse = true;
if (mHttp3Session) {
mHttp3Session->DontReuse();
}
}
bool HttpConnectionUDP::TestJoinConnection(const nsACString& hostname,
int32_t port) {
if (mHttp3Session && CanDirectlyActivate()) {
return mHttp3Session->TestJoinConnection(hostname, port);
}
return false;
}
bool HttpConnectionUDP::JoinConnection(const nsACString& hostname,
int32_t port) {
if (mHttp3Session && CanDirectlyActivate()) {
return mHttp3Session->JoinConnection(hostname, port);
}
return false;
}
bool HttpConnectionUDP::CanReuse() {
if (NS_FAILED(mErrorBeforeConnect)) {
return false;
}
if (mDontReuse) {
return false;
}
if (mHttp3Session) {
return mHttp3Session->CanReuse();
}
return false;
}
bool HttpConnectionUDP::CanDirectlyActivate() {
// return true if a new transaction can be addded to ths connection at any
// time through Activate(). In practice this means this is a healthy SPDY
// connection with room for more concurrent streams.
if (mHttp3Session) {
return CanReuse();
}
return false;
}
//----------------------------------------------------------------------------
// HttpConnectionUDP::nsAHttpConnection compatible methods
//----------------------------------------------------------------------------
nsresult HttpConnectionUDP::OnHeadersAvailable(nsAHttpTransaction* trans,
nsHttpRequestHead* requestHead,
nsHttpResponseHead* responseHead,
bool* reset) {
LOG(
("HttpConnectionUDP::OnHeadersAvailable [this=%p trans=%p "
"response-head=%p]\n",
this, trans, responseHead));
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
NS_ENSURE_ARG_POINTER(trans);
MOZ_ASSERT(responseHead, "No response head?");
DebugOnly<nsresult> rv =
responseHead->SetHeader(nsHttp::X_Firefox_Http3, mAlpnToken);
MOZ_ASSERT(NS_SUCCEEDED(rv));
// deal with 408 Server Timeouts
uint16_t responseStatus = responseHead->Status();
static const PRIntervalTime k1000ms = PR_MillisecondsToInterval(1000);
if (responseStatus == 408) {
// If this error could be due to a persistent connection reuse then
// we pass an error code of NS_ERROR_NET_RESET to
// trigger the transaction 'restart' mechanism. We tell it to reset its
// response headers so that it will be ready to receive the new response.
if (mIsReused &&
((PR_IntervalNow() - mHttp3Session->LastWriteTime()) < k1000ms)) {
Close(NS_ERROR_NET_RESET);
*reset = true;
return NS_OK;
}
}
return NS_OK;
}
bool HttpConnectionUDP::IsReused() { return mIsReused; }
nsresult HttpConnectionUDP::TakeTransport(
nsISocketTransport** aTransport, nsIAsyncInputStream** aInputStream,
nsIAsyncOutputStream** aOutputStream) {
return NS_ERROR_FAILURE;
}
void HttpConnectionUDP::GetTLSSocketControl(nsITLSSocketControl** secinfo) {
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
LOG(("HttpConnectionUDP::GetTLSSocketControl http3Session=%p\n",
mHttp3Session.get()));
if (mHttp3Session &&
NS_SUCCEEDED(mHttp3Session->GetTransactionTLSSocketControl(secinfo))) {
return;
}
*secinfo = nullptr;
}
nsresult HttpConnectionUDP::PushBack(const char* data, uint32_t length) {
LOG(("HttpConnectionUDP::PushBack [this=%p, length=%d]\n", this, length));
return NS_ERROR_UNEXPECTED;
}
class HttpConnectionUDPForceIO : public Runnable {
public:
HttpConnectionUDPForceIO(HttpConnectionUDP* aConn, bool doRecv)
: Runnable("net::HttpConnectionUDPForceIO"),
mConn(aConn),
mDoRecv(doRecv) {}
NS_IMETHOD Run() override {
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
if (mDoRecv) {
return mConn->RecvData();
}
MOZ_ASSERT(mConn->mForceSendPending);
mConn->mForceSendPending = false;
return mConn->SendData();
}
private:
RefPtr<HttpConnectionUDP> mConn;
bool mDoRecv;
};
nsresult HttpConnectionUDP::ResumeSend() {
LOG(("HttpConnectionUDP::ResumeSend [this=%p]\n", this));
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
RefPtr<HttpConnectionUDP> self(this);
NS_DispatchToCurrentThread(
NS_NewRunnableFunction("HttpConnectionUDP::CallSendData",
[self{std::move(self)}]() { self->SendData(); }));
return NS_OK;
}
nsresult HttpConnectionUDP::ResumeRecv() { return NS_OK; }
void HttpConnectionUDP::ForceSendIO(nsITimer* aTimer, void* aClosure) {
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
HttpConnectionUDP* self = static_cast<HttpConnectionUDP*>(aClosure);
MOZ_ASSERT(aTimer == self->mForceSendTimer);
self->mForceSendTimer = nullptr;
NS_DispatchToCurrentThread(new HttpConnectionUDPForceIO(self, false));
}
nsresult HttpConnectionUDP::MaybeForceSendIO() {
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
// NSPR derived I/O events are ready and this can cause a deadlock with
// https over https proxying. Normally we would expect the write callback to
// be invoked before this timer goes off, but set it at the old windows
// tick interval (kForceDelay) as a backup for those circumstances.
static const uint32_t kForceDelay = 17; // ms
if (mForceSendPending) {
return NS_OK;
}
MOZ_ASSERT(!mForceSendTimer);
mForceSendPending = true;
return NS_NewTimerWithFuncCallback(
getter_AddRefs(mForceSendTimer), HttpConnectionUDP::ForceSendIO, this,
kForceDelay, nsITimer::TYPE_ONE_SHOT,
"net::HttpConnectionUDP::MaybeForceSendIO");
}
// trigger an asynchronous read
nsresult HttpConnectionUDP::ForceRecv() {
LOG(("HttpConnectionUDP::ForceRecv [this=%p]\n", this));
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
return NS_DispatchToCurrentThread(new HttpConnectionUDPForceIO(this, true));
}
// trigger an asynchronous write
nsresult HttpConnectionUDP::ForceSend() {
LOG(("HttpConnectionUDP::ForceSend [this=%p]\n", this));
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
return MaybeForceSendIO();
}
HttpVersion HttpConnectionUDP::Version() { return HttpVersion::v3_0; }
PRIntervalTime HttpConnectionUDP::LastWriteTime() {
return mHttp3Session->LastWriteTime();
}
//-----------------------------------------------------------------------------
// HttpConnectionUDP <private>
//-----------------------------------------------------------------------------
void HttpConnectionUDP::CloseTransaction(nsAHttpTransaction* trans,
nsresult reason, bool aIsShutdown) {
LOG(("HttpConnectionUDP::CloseTransaction[this=%p trans=%p reason=%" PRIx32
"]\n",
this, trans, static_cast<uint32_t>(reason)));
MOZ_ASSERT(trans == mHttp3Session);
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
if (NS_SUCCEEDED(reason) || (reason == NS_BASE_STREAM_CLOSED)) {
MOZ_ASSERT(false);
return;
}
// The connection and security errors clear out alt-svc mappings
// in case any previously validated ones are now invalid
if (((reason == NS_ERROR_NET_RESET) ||
(NS_ERROR_GET_MODULE(reason) == NS_ERROR_MODULE_SECURITY)) &&
mConnInfo && !(mTransactionCaps & NS_HTTP_ERROR_SOFTLY)) {
gHttpHandler->ClearHostMapping(mConnInfo);
}
mDontReuse = true;
if (mHttp3Session) {
mHttp3Session->SetCleanShutdown(aIsShutdown);
mHttp3Session->Close(reason);
if (!mHttp3Session->IsClosed()) {
// During closing phase we still keep mHttp3Session session,
// to resend CLOSE_CONNECTION frames.
return;
}
}
mHttp3Session = nullptr;
{
MutexAutoLock lock(mCallbacksLock);
mCallbacks = nullptr;
}
Close(reason, aIsShutdown);
// flag the connection as reused here for convenience sake. certainly
// it might be going away instead ;-)
mIsReused = true;
}
void HttpConnectionUDP::OnQuicTimeoutExpired() {
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
LOG(("HttpConnectionUDP::OnQuicTimeoutExpired [this=%p]\n", this));
// if the transaction was dropped...
if (!mHttp3Session) {
LOG((" no transaction; ignoring event\n"));
return;
}
nsresult rv = mHttp3Session->ProcessOutputAndEvents(mSocket);
if (NS_FAILED(rv)) {
CloseTransaction(mHttp3Session, rv);
}
}
//-----------------------------------------------------------------------------
// HttpConnectionUDP::nsISupports
//-----------------------------------------------------------------------------
NS_IMPL_ADDREF(HttpConnectionUDP)
NS_IMPL_RELEASE(HttpConnectionUDP)
NS_INTERFACE_MAP_BEGIN(HttpConnectionUDP)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_ENTRY(nsIUDPSocketSyncListener)
NS_INTERFACE_MAP_ENTRY(nsIInterfaceRequestor)
NS_INTERFACE_MAP_ENTRY(HttpConnectionBase)
NS_INTERFACE_MAP_ENTRY_CONCRETE(HttpConnectionUDP)
NS_INTERFACE_MAP_END
void HttpConnectionUDP::NotifyDataRead() {
mExperienceState |= ConnectionExperienceState::First_Response_Received;
}
void HttpConnectionUDP::NotifyDataWrite() {
mExperienceState |= ConnectionExperienceState::First_Request_Sent;
}
// called on the socket transport thread
nsresult HttpConnectionUDP::RecvData() {
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
// if the transaction was dropped...
if (!mHttp3Session) {
LOG((" no Http3Session; ignoring event\n"));
return NS_OK;
}
nsresult rv = mHttp3Session->RecvData(mSocket);
LOG(("HttpConnectionUDP::OnInputReady %p rv=%" PRIx32, this,
static_cast<uint32_t>(rv)));
if (NS_FAILED(rv)) CloseTransaction(mHttp3Session, rv);
return NS_OK;
}
// called on the socket transport thread
nsresult HttpConnectionUDP::SendData() {
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
// if the transaction was dropped...
if (!mHttp3Session) {
LOG((" no Http3Session; ignoring event\n"));
return NS_OK;
}
nsresult rv = mHttp3Session->SendData(mSocket);
LOG(("HttpConnectionUDP::OnInputReady %p rv=%" PRIx32, this,
static_cast<uint32_t>(rv)));
if (NS_FAILED(rv)) CloseTransaction(mHttp3Session, rv);
return NS_OK;
}
//-----------------------------------------------------------------------------
// HttpConnectionUDP::nsIInterfaceRequestor
//-----------------------------------------------------------------------------
// not called on the socket transport thread
NS_IMETHODIMP
HttpConnectionUDP::GetInterface(const nsIID& iid, void** result) {
// NOTE: This function is only called on the UI thread via sync proxy from
// the socket transport thread. If that weren't the case, then we'd
// have to worry about the possibility of mHttp3Session going away
// part-way through this function call. See CloseTransaction.
// NOTE - there is a bug here, the call to getinterface is proxied off the
// nss thread, not the ui thread as the above comment says. So there is
MOZ_ASSERT(!OnSocketThread(), "on socket thread");
nsCOMPtr<nsIInterfaceRequestor> callbacks;
{
MutexAutoLock lock(mCallbacksLock);
callbacks = mCallbacks;
}
if (callbacks) return callbacks->GetInterface(iid, result);
return NS_ERROR_NO_INTERFACE;
}
void HttpConnectionUDP::SetEvent(nsresult aStatus) {
switch (aStatus) {
case NS_NET_STATUS_RESOLVING_HOST:
mBootstrappedTimings.domainLookupStart = TimeStamp::Now();
break;
case NS_NET_STATUS_RESOLVED_HOST:
mBootstrappedTimings.domainLookupEnd = TimeStamp::Now();
break;
case NS_NET_STATUS_CONNECTING_TO:
mBootstrappedTimings.connectStart = TimeStamp::Now();
break;
case NS_NET_STATUS_CONNECTED_TO:
mBootstrappedTimings.connectEnd = TimeStamp::Now();
break;
case NS_NET_STATUS_TLS_HANDSHAKE_STARTING:
mBootstrappedTimings.secureConnectionStart = TimeStamp::Now();
break;
case NS_NET_STATUS_TLS_HANDSHAKE_ENDED:
mBootstrappedTimings.connectEnd = TimeStamp::Now();
break;
default:
break;
}
}
bool HttpConnectionUDP::IsProxyConnectInProgress() { return false; }
bool HttpConnectionUDP::LastTransactionExpectedNoContent() {
return mLastTransactionExpectedNoContent;
}
void HttpConnectionUDP::SetLastTransactionExpectedNoContent(bool val) {
mLastTransactionExpectedNoContent = val;
}
bool HttpConnectionUDP::IsPersistent() { return !mDontReuse; }
nsAHttpTransaction* HttpConnectionUDP::Transaction() { return mHttp3Session; }
int64_t HttpConnectionUDP::BytesWritten() {
if (!mHttp3Session) {
return 0;
}
return mHttp3Session->GetBytesWritten();
}
NS_IMETHODIMP HttpConnectionUDP::OnPacketReceived(nsIUDPSocket* aSocket) {
RecvData();
return NS_OK;
}
NS_IMETHODIMP HttpConnectionUDP::OnStopListening(nsIUDPSocket* aSocket,
nsresult aStatus) {
CloseTransaction(mHttp3Session, aStatus);
return NS_OK;
}
nsresult HttpConnectionUDP::GetSelfAddr(NetAddr* addr) {
if (mSelfAddr) {
return mSelfAddr->GetNetAddr(addr);
}
return NS_ERROR_FAILURE;
}
nsresult HttpConnectionUDP::GetPeerAddr(NetAddr* addr) {
if (mPeerAddr) {
return mPeerAddr->GetNetAddr(addr);
}
return NS_ERROR_FAILURE;
}
bool HttpConnectionUDP::ResolvedByTRR() { return mResolvedByTRR; }
nsIRequest::TRRMode HttpConnectionUDP::EffectiveTRRMode() {
return mEffectiveTRRMode;
}
TRRSkippedReason HttpConnectionUDP::TRRSkipReason() { return mTRRSkipReason; }
} // namespace net
} // namespace mozilla