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check MTU of remote router

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orignal 2014-09-14 17:54:55 -04:00
parent 4e213550ff
commit 37e4bc8e5b
2 changed files with 29 additions and 3 deletions

7
SSUData.h
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@ -15,7 +15,9 @@ namespace ssu
{
const size_t SSU_MTU = 1484;
const size_t SSU_PACKET_SIZE = SSU_MTU - 20 - 8; // 20 - IPv4 header, 8 - UDP
const size_t IPV4_HEADER_SIZE = 20;
const size_t UDP_HEADER_SIZE = 8;
const size_t SSU_MAX_PACKET_SIZE = SSU_MTU - IPV4_HEADER_SIZE - UDP_HEADER_SIZE; // 1456
const int RESEND_INTERVAL = 3; // in seconds
const int MAX_NUM_RESENDS = 5;
// data flags
@ -31,7 +33,7 @@ namespace ssu
int fragmentNum;
size_t len;
bool isLast;
uint8_t buf[SSU_PACKET_SIZE + 18];
uint8_t buf[SSU_MAX_PACKET_SIZE + 18];
Fragment () = default;
Fragment (int n, const uint8_t * b, int l, bool last):
@ -93,6 +95,7 @@ namespace ssu
std::map<uint32_t, IncompleteMessage *> m_IncomleteMessages;
std::map<uint32_t, SentMessage *> m_SentMessages;
boost::asio::deadline_timer m_ResendTimer;
int m_PacketSize;
};
}
}