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Add support for IPv4 link-local addresses.

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This commit is contained in:
akwizgran
2019-10-03 10:59:56 +01:00
parent eb562f8f6b
commit ed13cbca6a
2 changed files with 37 additions and 38 deletions
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41
bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/LanTcpPlugin.java
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@@ -158,36 +158,41 @@ class LanTcpPlugin extends TcpPlugin {
// Package access for testing
boolean addressesAreOnSameLan(byte[] localIp, byte[] remoteIp) {
// 10.0.0.0/8
if (isPrefix10(localIp)) return isPrefix10(remoteIp);
if (isSlash8SiteLocal(localIp)) return isSlash8SiteLocal(remoteIp);
// 172.16.0.0/12
if (isPrefix172(localIp)) return isPrefix172(remoteIp);
if (isSlash12SiteLocal(localIp)) return isSlash12SiteLocal(remoteIp);
// 192.168.0.0/16
if (isPrefix192(localIp)) return isPrefix192(remoteIp);
// Unrecognised prefix - may be compatible
return true;
if (isSlash16SiteLocal(localIp)) return isSlash16SiteLocal(remoteIp);
// 169.254.0.0/16
if (isSlash16LinkLocal(localIp)) return isSlash16LinkLocal(remoteIp);
// Unrecognised prefix
return false;
}
private static boolean isPrefix10(byte[] ipv4) {
private static boolean isSlash8SiteLocal(byte[] ipv4) {
return ipv4[0] == 10;
}
private static boolean isPrefix172(byte[] ipv4) {
private static boolean isSlash12SiteLocal(byte[] ipv4) {
return ipv4[0] == (byte) 172 && (ipv4[1] & 0xF0) == 16;
}
private static boolean isPrefix192(byte[] ipv4) {
private static boolean isSlash16SiteLocal(byte[] ipv4) {
return ipv4[0] == (byte) 192 && ipv4[1] == (byte) 168;
}
// Returns the prefix length for an RFC 1918 address, or 0 for any other
// address
private static int getRfc1918PrefixLength(InetAddress addr) {
private static boolean isSlash16LinkLocal(byte[] ipv4) {
return ipv4[0] == (byte) 169 && ipv4[1] == (byte) 254;
}
// Returns the prefix length for a link-local or site-local address, or 0
// for any other address
private static int getPrefixLengthIfKnown(InetAddress addr) {
if (!(addr instanceof Inet4Address)) return 0;
if (!addr.isSiteLocalAddress()) return 0;
byte[] ipv4 = addr.getAddress();
if (isPrefix10(ipv4)) return 8;
if (isPrefix172(ipv4)) return 12;
if (isPrefix192(ipv4)) return 16;
if (isSlash8SiteLocal(ipv4)) return 8;
if (isSlash12SiteLocal(ipv4)) return 12;
if (isSlash16SiteLocal(ipv4) || isSlash16LinkLocal(ipv4)) return 16;
return 0;
}
@@ -308,9 +313,9 @@ class LanTcpPlugin extends TcpPlugin {
int aPort = a.getPort(), bPort = b.getPort();
if (aPort > 0 && bPort == 0) return -1;
if (aPort == 0 && bPort > 0) return 1;
// Prefer addresses with longer RFC 1918 prefixes
int aPrefix = getRfc1918PrefixLength(a.getAddress());
int bPrefix = getRfc1918PrefixLength(b.getAddress());
// Prefer addresses with longer prefixes
int aPrefix = getPrefixLengthIfKnown(a.getAddress());
int bPrefix = getPrefixLengthIfKnown(b.getAddress());
return bPrefix - aPrefix;
}
}