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Try bringing back TTL escalation -- may help with Docker (IP-MASQ) type NAT

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This commit is contained in:
Adam Ierymenko 2015-11-09 15:44:13 -08:00
parent 94f4316a0e
commit 2cc50bdb10
7 changed files with 58 additions and 19 deletions
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18
osdep/Phy.hpp
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@ -414,6 +414,24 @@ public:
return (PhySocket *)&sws;
}
/**
* Set the IP TTL for the next outgoing packet (for IPv4 UDP sockets only)
*
* @param ttl New TTL (0 or >255 will set it to 255)
* @return True on success
*/
inline bool setIp4UdpTtl(PhySocket *sock,unsigned int ttl)
{
PhySocketImpl &sws = *(reinterpret_cast<PhySocketImpl *>(sock));
#if defined(_WIN32) || defined(_WIN64)
DWORD tmp = ((ttl == 0)||(ttl > 255)) ? 255 : (DWORD)ttl;
return (::setsockopt(sws.sock,IPPROTO_IP,IP_TTL,(const char *)&tmp,sizeof(tmp)) == 0);
#else
int tmp = ((ttl == 0)||(ttl > 255)) ? 255 : (int)ttl;
return (::setsockopt(sws.sock,IPPROTO_IP,IP_TTL,(void *)&tmp,sizeof(tmp)) == 0);
#endif
}
/**
* Send a UDP packet
*