From e7fca666554cddb3f7104d920c59c98cdb79ca7f Mon Sep 17 00:00:00 2001
From: Arceliar <Arceliar@users.noreply.github.com>
Date: Thu, 14 Jun 2018 07:58:07 -0500
Subject: [PATCH] fix address/prefix code, platform specific parts still need
 testing

---
 src/yggdrasil/address.go | 9 +++++----
 src/yggdrasil/core.go    | 2 +-
 src/yggdrasil/icmpv6.go  | 2 +-
 3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/src/yggdrasil/address.go b/src/yggdrasil/address.go
index a499edf..dd2c410 100644
--- a/src/yggdrasil/address.go
+++ b/src/yggdrasil/address.go
@@ -19,17 +19,18 @@ func (a *address) isValid() bool {
 			return false
 		}
 	}
-	return (*a)[len(address_prefix)-1]&0x80 == 0
+	return true
 }
 
 // isValid returns true if a prefix falls within the range usable by the network.
 func (s *subnet) isValid() bool {
-	for idx := range address_prefix {
+	l := len(address_prefix)
+	for idx := range address_prefix[:l-1] {
 		if (*s)[idx] != address_prefix[idx] {
 			return false
 		}
 	}
-	return (*s)[len(address_prefix)-1]&0x80 != 0
+	return (*s)[l-1] == address_prefix[l-1]|0x01
 }
 
 // address_addrForNodeID takes a *NodeID as an argument and returns an *address.
@@ -83,7 +84,7 @@ func address_subnetForNodeID(nid *NodeID) *subnet {
 	addr := *address_addrForNodeID(nid)
 	var snet subnet
 	copy(snet[:], addr[:])
-	snet[len(address_prefix)-1] |= 0x80
+	snet[len(address_prefix)-1] |= 0x01
 	return &snet
 }
 
diff --git a/src/yggdrasil/core.go b/src/yggdrasil/core.go
index e1da6fe..bd7fece 100644
--- a/src/yggdrasil/core.go
+++ b/src/yggdrasil/core.go
@@ -117,7 +117,7 @@ func (c *Core) Start(nc *config.NodeConfig, log *log.Logger) error {
 	}
 
 	ip := net.IP(c.router.addr[:]).String()
-	if err := c.tun.start(nc.IfName, nc.IfTAPMode, fmt.Sprintf("%s/8", ip), nc.IfMTU); err != nil {
+	if err := c.tun.start(nc.IfName, nc.IfTAPMode, fmt.Sprintf("%s/%d", ip, 8*len(address_prefix)-1), nc.IfMTU); err != nil {
 		c.log.Println("Failed to start TUN/TAP")
 		return err
 	}
diff --git a/src/yggdrasil/icmpv6.go b/src/yggdrasil/icmpv6.go
index 1eb1c67..0491f88 100644
--- a/src/yggdrasil/icmpv6.go
+++ b/src/yggdrasil/icmpv6.go
@@ -252,7 +252,7 @@ func (i *icmpv6) handle_ndp(in []byte) ([]byte, error) {
 	case source.isValid():
 	case snet.isValid():
 	default:
-		return nil, errors.New("Not an NDP for fd00::/8")
+		return nil, errors.New("Not an NDP for 0200::/7")
 	}
 
 	// Create our NDP message body response