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464xlat: use a gatewayed route, not point-to-point

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Various applications such as Skype and our legacy VPN code
do not understand routes pointed directly at point-to-point
interfaces and require a default gateway IPv4 address in
order to function.

Grudgingly accept that routes without default gateways Are Hard
and use gatewayed routes instead. This causes routing to go from:

default dev clat4  scope link

to:

default via 192.0.0.4 dev clat4  scope link
192.0.0.4 dev clat4  scope link

and those apps now work.

Bug: 9597256
Bug: 9597516
Change-Id: I7b7890873802d3cb99affd6eb70b8ab75e7a2cf6
This commit is contained in:
Lorenzo Colitti
2013-06-17 11:10:27 -07:00
parent 1f5cec7fdc
commit d78d557cb8
1 changed files with 13 additions and 6 deletions
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19
services/java/com/android/server/connectivity/Nat464Xlat.java
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@@ -147,17 +147,24 @@ public class Nat464Xlat extends BaseNetworkObserver {
" added, mIsRunning = " + mIsRunning + " -> true");
mIsRunning = true;
// Get the network configuration of the clat interface, store it
// in our link properties, and stack it on top of the interface
// it's running on.
// Create the LinkProperties for the clat interface by fetching the
// IPv4 address for the interface and adding an IPv4 default route,
// then stack the LinkProperties on top of the link it's running on.
// Although the clat interface is a point-to-point tunnel, we don't
// point the route directly at the interface because some apps don't
// understand routes without gateways (see, e.g., http://b/9597256
// http://b/9597516). Instead, set the next hop of the route to the
// clat IPv4 address itself (for those apps, it doesn't matter what
// the IP of the gateway is, only that there is one).
try {
InterfaceConfiguration config = mNMService.getInterfaceConfig(iface);
LinkAddress clatAddress = config.getLinkAddress();
mLP.clear();
mLP.setInterfaceName(iface);
RouteInfo ipv4Default = new RouteInfo(new LinkAddress(Inet4Address.ANY, 0), null,
iface);
RouteInfo ipv4Default = new RouteInfo(new LinkAddress(Inet4Address.ANY, 0),
clatAddress.getAddress(), iface);
mLP.addRoute(ipv4Default);
mLP.addLinkAddress(config.getLinkAddress());
mLP.addLinkAddress(clatAddress);
mTracker.addStackedLink(mLP);
Slog.i(TAG, "Adding stacked link. tracker LP: " +
mTracker.getLinkProperties());