1. preparing for NetworkDomain load from config

src/core/address.go

@@ -16,15 +16,15 @@ type Subnet [8]byte
 // The current implementation requires this to be a multiple of 8 bits + 7 bits.
 // The 8th bit of the last byte is used to signal nodes (0) or /64 prefixes (1).
 // Nodes that configure this differently will be unable to communicate with each other using IP packets, though routing and the DHT machinery *should* still work.
-func GetPrefix() [1]byte {
+func (c *Core) GetPrefix() [1]byte {
 	return [...]byte{0xfc}
 }
 
 // IsValid returns true if an address falls within the range used by nodes in the network.
-func (a *Address) IsValid() bool {
+func (c *Core) IsValidAddress(a Address) bool {
-	prefix := GetPrefix()
+	prefix := c.GetPrefix()
 	for idx := range prefix {
-		if (*a)[idx] != prefix[idx] {
+		if a[idx] != prefix[idx] {
 			return false
 		}
 	}
@@ -32,15 +32,15 @@ func (a *Address) IsValid() bool {
 }
 
 // IsValid returns true if a prefix falls within the range usable by the network.
-func (s *Subnet) IsValid() bool {
+func (c *Core) IsValidSubnet(s Subnet) bool {
-	prefix := GetPrefix()
+	prefix := c.GetPrefix()
 	l := len(prefix)
 	for idx := range prefix[:l-1] {
-		if (*s)[idx] != prefix[idx] {
+		if s[idx] != prefix[idx] {
 			return false
 		}
 	}
-	return (*s)[l-1] == prefix[l-1]|0x01
+	return s[l-1] == prefix[l-1]|0x01
 }
 
 // AddrForKey takes an ed25519.PublicKey as an argument and returns an *Address.
@@ -86,7 +86,7 @@ func (c *Core) AddrForKey(publicKey ed25519.PublicKey) *Address {
 			temp = append(temp, bits)
 		}
 	}
-	prefix := GetPrefix()
+	prefix := c.GetPrefix()
 	copy(addr[:], prefix[:])
 	addr[len(prefix)] = ones
 	copy(addr[len(prefix)+1:], temp)
@@ -108,16 +108,16 @@ func (c *Core) SubnetForKey(publicKey ed25519.PublicKey) *Subnet {
 	}
 	var snet Subnet
 	copy(snet[:], addr[:])
-	prefix := GetPrefix() // nolint:staticcheck
+	prefix := c.GetPrefix() // nolint:staticcheck
 	snet[len(prefix)-1] |= 0x01
 	return &snet
 }
 
 // GetKet returns the partial ed25519.PublicKey for the Address.
 // This is used for key lookup.
-func (a *Address) GetKey() ed25519.PublicKey {
+func (c *Core) GetAddressKey(a Address) ed25519.PublicKey {
 	var key [ed25519.PublicKeySize]byte
-	prefix := GetPrefix() // nolint:staticcheck
+	prefix := c.GetPrefix() // nolint:staticcheck
 	ones := int(a[len(prefix)])
 	for idx := 0; idx < ones; idx++ {
 		key[idx/8] |= 0x80 >> byte(idx%8)
@@ -143,8 +143,8 @@ func (a *Address) GetKey() ed25519.PublicKey {
 
 // GetKet returns the partial ed25519.PublicKey for the Subnet.
 // This is used for key lookup.
-func (s *Subnet) GetKey() ed25519.PublicKey {
+func (c *Core) GetSubnetKey(s Subnet) ed25519.PublicKey {
 	var addr Address
 	copy(addr[:], s[:])
-	return addr.GetKey()
+	return c.GetAddressKey(addr)
 }

src/core/core.go

@@ -40,6 +40,7 @@ type Core struct {
 		nodeinfo           NodeInfo                   // immutable after startup
 		nodeinfoPrivacy    NodeInfoPrivacy            // immutable after startup
 		_allowedPublicKeys map[[32]byte]struct{}      // configurable after startup
+		networkdomain      NetworkDomain              // immutable after startup
 	}
 }
 

src/core/options.go

@@ -32,6 +32,9 @@ type Peer struct {
 }
 type NodeInfo map[string]interface{}
 type NodeInfoPrivacy bool
+type NetworkDomain struct {
+	Prefix          [1]byte
+}
 type AllowedPublicKey ed25519.PublicKey
 
 func (a ListenAddress) isSetupOption()    {}

src/ipv6rwc/ipv6rwc.go

@@ -94,7 +94,7 @@ func (k *keyStore) sendToAddress(addr core.Address, bs []byte) {
 			}
 		})
 		k.mutex.Unlock()
-		k.sendKeyLookup(addr.GetKey())
+		k.sendKeyLookup(k.core.GetAddressKey(addr))
 	}
 }
 
@@ -123,7 +123,7 @@ func (k *keyStore) sendToSubnet(subnet core.Subnet, bs []byte) {
 			}
 		})
 		k.mutex.Unlock()
-		k.sendKeyLookup(subnet.GetKey())
+		k.sendKeyLookup(k.core.GetSubnetKey(subnet))
 	}
 }
 
@@ -286,9 +286,9 @@ func (k *keyStore) writePC(bs []byte) (int, error) {
 		strErr := fmt.Sprint("incorrect source address: ", net.IP(srcAddr[:]).String())
 		return 0, errors.New(strErr)
 	}
-	if dstAddr.IsValid() {
+	if k.core.IsValidAddress(dstAddr) {
 		k.sendToAddress(dstAddr, bs)
-	} else if dstSubnet.IsValid() {
+	} else if k.core.IsValidSubnet(dstSubnet) {
 		k.sendToSubnet(dstSubnet, bs)
 	} else {
 		return 0, errors.New("invalid destination address")

src/tun/tun.go

@@ -26,6 +26,7 @@ type MTU uint16
 // should pass this object to the mesh.SetRouterAdapter() function before
 // calling mesh.Start().
 type TunAdapter struct {
+	core        *core.Core
 	rwc         *ipv6rwc.ReadWriteCloser
 	log         core.Logger
 	addr        core.Address
@@ -107,7 +108,7 @@ func (tun *TunAdapter) _start() error {
 	}
 	tun.addr = tun.rwc.Address()
 	tun.subnet = tun.rwc.Subnet()
-	addr := fmt.Sprintf("%s/%d", net.IP(tun.addr[:]).String(), 8*len(core.GetPrefix())-1)
+	addr := fmt.Sprintf("%s/%d", net.IP(tun.addr[:]).String(), 8*len(tun.core.GetPrefix())-1)
 	if tun.config.name == "none" || tun.config.name == "dummy" {
 		tun.log.Debugln("Not starting TUN as ifname is none or dummy")
 		tun.isEnabled = false