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adjust MTU for incoming SSU sessions

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orignal 2014-09-18 14:37:29 -04:00
parent cb46d63058
commit 1441c1371b
3 changed files with 38 additions and 20 deletions
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1
SSU.cpp
View File

@ -236,6 +236,7 @@ namespace ssu
i2p::data::Identity ident; i2p::data::Identity ident;
ident.FromBuffer (payload, identitySize); ident.FromBuffer (payload, identitySize);
m_RemoteIdent = ident.Hash (); m_RemoteIdent = ident.Hash ();
m_Data.UpdatePacketSize (m_RemoteIdent);
} }
else else
LogPrint ("SSU unexpected identity size ", identitySize); LogPrint ("SSU unexpected identity size ", identitySize);

51
SSUData.cpp
View File

@ -2,6 +2,7 @@
#include <boost/bind.hpp> #include <boost/bind.hpp>
#include "Log.h" #include "Log.h"
#include "Timestamp.h" #include "Timestamp.h"
#include "NetDb.h"
#include "SSU.h" #include "SSU.h"
#include "SSUData.h" #include "SSUData.h"
@ -15,26 +16,7 @@ namespace ssu
m_PacketSize = SSU_MAX_PACKET_SIZE; m_PacketSize = SSU_MAX_PACKET_SIZE;
auto remoteRouter = session.GetRemoteRouter (); auto remoteRouter = session.GetRemoteRouter ();
if (remoteRouter) if (remoteRouter)
{ AdjustPacketSize (*remoteRouter);
auto ssuAddress = remoteRouter->GetSSUAddress ();
if (ssuAddress && ssuAddress->mtu)
{
m_PacketSize = ssuAddress->mtu - IPV4_HEADER_SIZE - UDP_HEADER_SIZE;
if (m_PacketSize > 0)
{
// make sure packet size multiple of 16
m_PacketSize >>= 4;
m_PacketSize <<= 4;
if (m_PacketSize > (int)SSU_MAX_PACKET_SIZE) m_PacketSize = SSU_MAX_PACKET_SIZE;
LogPrint ("MTU=", ssuAddress->mtu, " packet size=", m_PacketSize);
}
else
{
LogPrint ("Unexpected MTU ", ssuAddress->mtu);
m_PacketSize = SSU_MAX_PACKET_SIZE;
}
}
}
} }
SSUData::~SSUData () SSUData::~SSUData ()
@ -49,6 +31,35 @@ namespace ssu
delete it.second; delete it.second;
} }
void SSUData::AdjustPacketSize (const i2p::data::RouterInfo& remoteRouter)
{
auto ssuAddress = remoteRouter.GetSSUAddress ();
if (ssuAddress && ssuAddress->mtu)
{
m_PacketSize = ssuAddress->mtu - IPV4_HEADER_SIZE - UDP_HEADER_SIZE;
if (m_PacketSize > 0)
{
// make sure packet size multiple of 16
m_PacketSize >>= 4;
m_PacketSize <<= 4;
if (m_PacketSize > (int)SSU_MAX_PACKET_SIZE) m_PacketSize = SSU_MAX_PACKET_SIZE;
LogPrint ("MTU=", ssuAddress->mtu, " packet size=", m_PacketSize);
}
else
{
LogPrint ("Unexpected MTU ", ssuAddress->mtu);
m_PacketSize = SSU_MAX_PACKET_SIZE;
}
}
}
void SSUData::UpdatePacketSize (const i2p::data::IdentHash& remoteIdent)
{
auto routerInfo = i2p::data::netdb.FindRouter (remoteIdent);
if (routerInfo)
AdjustPacketSize (*routerInfo);
}
void SSUData::ProcessSentMessageAck (uint32_t msgID) void SSUData::ProcessSentMessageAck (uint32_t msgID)
{ {
auto it = m_SentMessages.find (msgID); auto it = m_SentMessages.find (msgID);

6
SSUData.h
View File

@ -8,6 +8,8 @@
#include <set> #include <set>
#include <boost/asio.hpp> #include <boost/asio.hpp>
#include "I2NPProtocol.h" #include "I2NPProtocol.h"
#include "Identity.h"
#include "RouterInfo.h"
namespace i2p namespace i2p
{ {
@ -78,6 +80,8 @@ namespace ssu
void ProcessMessage (uint8_t * buf, size_t len); void ProcessMessage (uint8_t * buf, size_t len);
void Send (i2p::I2NPMessage * msg); void Send (i2p::I2NPMessage * msg);
void UpdatePacketSize (const i2p::data::IdentHash& remoteIdent);
private: private:
void SendMsgAck (uint32_t msgID); void SendMsgAck (uint32_t msgID);
@ -89,6 +93,8 @@ namespace ssu
void ScheduleResend (); void ScheduleResend ();
void HandleResendTimer (const boost::system::error_code& ecode); void HandleResendTimer (const boost::system::error_code& ecode);
void AdjustPacketSize (const i2p::data::RouterInfo& remoteRouter);
private: private:
SSUSession& m_Session; SSUSession& m_Session;