There is no AppCompatProgressDialog class as the use of ProgressDialog
is discouraged (instead progress bars should be placed in the layout directly).
To display the current ProgressDialog instances correctly on systems < 21 we
modify the window background color.
We'll have to change some stuff that Google deprecated (e.g. the tabs in
the ActionBar) and that requires changing the theme at least in activities.
Since that would look a bit inconsistent we'll change it globally and
use parts of the support library.
This allows using manual priorities for traps, which have a lower
base priority than the resulting IPsec policies. This could otherwise
be problematic if, for example, swanctl --install/uninstall is used while
an SA is established combined with e.g. IPComp, where the trap policy does
not look the same as the IPsec policy (which is now otherwise often the case
as the reqids stay the same).
It also orders policies by selector size if manual priorities are configured
and narrowing occurs.
This could interfere with cleanup handlers that try to acquire
mutexes while other threads holding these try to e.g. cancel the threads.
As cleanup handlers are only queued by the threads themselves we don't need
any synchronization to access the list.
Fixes#1401.
The kernel policy now considers src and dst port masks as well as
restictions to a given network interface. The base priority is
100'000 for passthrough shunts, 200'000 for IPsec policies,
300'000 for IPsec policy traps and 400'000 for fallback drop shunts.
The values 1..30'000 can be used for manually set priorities.
This allows two CHILD_SAs with reversed subnets to install two FWD
policies each. Since the outbound policy won't have a reqid set we will
end up with the two inbound FWD policies installed in the kernel, with
the correct templates to allow decrypted traffic.
We can't set a template on the outbound FWD policy (or we'd have to make
it optional). Because if the traffic does not come from another (matching)
IPsec tunnel it would get dropped due to the template mismatch.
If there is a DROP shunt that matches outbound forwarded traffic it
would get dropped as the FWD policy we install only matches decrypted
inbound traffic. That's because the Linux kernel first checks the FWD
policies before looking up the OUT policy and SA to encrypt the packets.
This allows us to install more than one FWD policy. We already do this
in the kernel-pfkey plugin (there the original reason was that not all
kernels support FWD policies).
Tobias Brunner