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Prefer IPv6 paths if available.

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This commit is contained in:
Adam Ierymenko 2015-09-23 16:16:36 -07:00
parent b242216674
commit 0e5aac6a11
1 changed files with 10 additions and 1 deletions
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11
node/Path.hpp
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@ -93,7 +93,16 @@ public:
/** /**
* @return Preference rank, higher == better * @return Preference rank, higher == better
*/ */
inline int preferenceRank() const throw() { return (int)_ipScope; } // IP scopes are in ascending rank order in InetAddress.hpp inline int preferenceRank() const throw()
{
// First, since the scope enum values in InetAddress.hpp are in order of
// use preference rank, we take that. Then we multiple by two, yielding
// a sequence like 0, 2, 4, 6, etc. Then if it's IPv6 we add one. This
// makes IPv6 addresses of a given scope outrank IPv4 addresses of the
// same scope -- e.g. 1 outranks 0. This makes us prefer IPv6, but not
// if the address scope/class is of a fundamentally lower rank.
return ( ((int)_ipScope * 2) + ((_addr.ss_family == AF_INET6) ? 1 : 0) );
}
/** /**
* @return Path trust level * @return Path trust level