func sortByRFC6724(addrs []IPAddr) { … } func sortByRFC6724withSrcs(addrs []IPAddr, srcs []netip.Addr) { … } // srcAddrs tries to UDP-connect to each address to see if it has a // route. (This doesn't send any packets). The destination port // number is irrelevant. func srcAddrs(addrs []IPAddr) []netip.Addr { … } type ipAttr … func ipAttrOf(ip netip.Addr) ipAttr { … } type byRFC6724Info … // compareByRFC6724 compares two byRFC6724Info records and returns an integer // indicating the order. It follows the algorithm and variable names from // RFC 6724 section 6. Returns -1 if a is preferred, 1 if b is preferred, // and 0 if they are equal. func compareByRFC6724(a, b byRFC6724Info) int { … } type policyTableEntry … type policyTable … var rfc6724policyTable … // Classify returns the policyTableEntry of the entry with the longest // matching prefix that contains ip. // The table t must be sorted from largest mask size to smallest. func (t policyTable) Classify(ip netip.Addr) policyTableEntry { … } type scope … const scopeInterfaceLocal … const scopeLinkLocal … const scopeAdminLocal … const scopeSiteLocal … const scopeOrgLocal … const scopeGlobal … func classifyScope(ip netip.Addr) scope { … } // commonPrefixLen reports the length of the longest prefix (looking // at the most significant, or leftmost, bits) that the // two addresses have in common, up to the length of a's prefix (i.e., // the portion of the address not including the interface ID). // // If a or b is an IPv4 address as an IPv6 address, the IPv4 addresses // are compared (with max common prefix length of 32). // If a and b are different IP versions, 0 is returned. // // See https://tools.ietf.org/html/rfc6724#section-2.2 func commonPrefixLen(a netip.Addr, b IP) (cpl int) { … }
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