Current upstream selection code suffers from a race where if the
CONNECTIVITY_ACTION broadcast for a given network switch is
received and processed before the NetworkCallbacks for that
network switch, upstream selection just re-selects the same
upstream it had before. The incorrect upstream persists until
another CONNECTIVITY_ACTION is received.
Fix this by defining a new EVENT_DEFAULT_SWITCHED message code
communicated from UpstreamNetworkMonitor to Tethering, and send
that whenever the default network switches.
The message is sent in onLinkPropertiesChanged, because the
tethering code stores all information about networks in an
UpstreamNetworkState structure that contains Network,
LinkProperties and NetworkCapabilities. When a network switch
occurs, onLinkPropertiesChanged always follows onAvailable and
onCapabilitiesChanged, and thus marks the first point in time
when all the information is available.
This CL tries not to change existing codepaths too much, but
it does move the update of mDefaultInternetNetwork from
onCapabilitiesChanged to onLinkPropertiesChanged. This should
not be a problem because the only thing that reads
mDefaultInternetNetwork is getCurrentPreferredUpstream, which,
in the case of a default network switch, will be run by the
onLinkPropertiesChanged which will immediately follow.
Bug: 173068192
Test: changes to existing unit tests show bug is fixed
Change-Id: Ic9196bc92892811b25bda463ffd839ee5c19d294
Lorenzo Colitticommited 2021-04-05 22:52:13 +09:00
In the current tethering code, upstream selection is only
triggered by CONNECTIVITY_ACTION. But in automatic mode, the
upstream network is selected by listening to a NetworkCallback
that tracks the default network.
This causes a race where if the CONNECTIVITY_ACTION for a network
switch is received and processed before the callbacks for that
network switch, upstream selection just re-selects the upstream
currently in use.
Make it possible to test this by giving TestConnectivityManager
the ability to choose the ordering between NetworkCallbacks and
CONNECTIVITY_ACTION, and to run an arbitrary Runnable between
calling one and calling the other. TetheringTest passes a
Runnable that calls mLooper.dispatchAll(), which ensures that
the tethering code fully processes the first set of information
it receives (either the broadcast (or the callbacks) before
receiving any more information.
Add test coverage to testAutomaticUpstreamSelection that
exercises various orderings, and make the test pass by expecting
the buggy behaviour of the current code.
An upcoming CL will fix the bug and update the tests.
Bug: 173068192
Test: test-only change
Change-Id: I7805444dcf59f6d5f8517fbcf2f2b1641783d50b
Lorenzo Colitticommited 2021-04-05 14:51:53 +09:00
These members are public mutable and their names are confusing.
Make them package-private and final.
Bug: 173068192
Test: test-only change
Change-Id: I87131c48f67b6614c25aa99e1cbc53196f49aa7c
Lorenzo Colitticommited 2021-03-31 20:23:20 +09:00
Currently, TestConnectivityManager immediately sends all
callbacks and broadcasts to the Tethering code as soon as the
test code makes any change.
This makes it impossible to affect the order in which those
events are delivered to the Tethering code, so it is not possible
to test for races.
Fix some of this as follows:
1. Make TestConnectivityManager post all its callbacks to the
handlers that Tethering registered them with.
2. In TetheringTest, use the existing TestLooper object to
advance time manually. Also use setUseRegisteredHandlers to
ensure that the broadcasts are sent in order. This requires
calling dispatchAll() after sending the broadcast to preserve
the existing synchronous behaviour. Take advantage of that to
remove lots of existing dispatchAll calls.
3. Add a TestLooper to UpstreamNetworkMonitorTest and use it.
Keep the test passing by adding lots of mLooper.dispatchAll(),
which is a bit ugly but probably acceptable given the
additional coverage it provides.
This exposes an existing bug in the code where if upstream
selection is in automatic mode, and all CONNECTIVITY_ACTION
broadcasts are received before all NetworkCallbacks, the code
does not switch upstream.
In order to make the tests pass, re-order the CONNECTIVITY_ACTION
broadcasts with the NetworkCallbacks in TestConnectivityManager
so as not to trigger the bug. A future CL will make the order
configurable.
While I'm at it, switch TestConnectivityManager from HashMap to
ArrayMap, which is generally preferred for maps that do not
contain too many elements.
Bug: 173068192
Test: test-only change
Change-Id: I964f365c691fbc396ab0a87f292bd32b123011fe
Lorenzo Colitticommited 2021-03-31 20:17:11 +09:00
Currently, Tethering files NetworkRequests even when
config_tether_upstream_automatic is enabled. This is incorrect:
when the automatic upstream selection is enabled, the tethering
upstream should always follow the default network and there is
no need to file any requests.
These requests are harmful when tethering is not using cellular
as its upstream, because:
- If the device does not use mobile data always on, the request
causes the cellular network to be brought up, causing power
draw.
- Even if the device does use mobile data always on, the request
causes the cellular network to come to the foreground, which
allows all apps to access it, causing potential data usage.
Amend the existing testGetCurrentPreferredUpstream to cover these
changes, by making that test case always set automatic upstream
mode. This does not result in any loss of meaningful test
coverage, because getCurrentPreferredUpstream is only ever called
when chooseUpstreamAutomatically is enabled.
Bug: 173068192
Test: atest TetheringTests
Change-Id: I068a5338699a3ed04f24f97f785ea89ff5890e50
Lorenzo Colitticommited 2021-03-31 19:27:17 +09:00
UpstreamNetworkMonitor is the part of tethering that files
NetworkRequests for upstream netwoks, but it currently does not
know all the requirements for upstream selection. For example, it
does not know whether automatic upstream selection is in use.
This forces the upstream selection code to be split between
UpstreamNetworkMonitor and Tethering. This makes it difficult to
follow.
This CL ensures that all information about upstream requirements
(DUN required, automatic upstream selection, tryCell) is passed
to UpstreamNetworkMonitor so it can be aware of it.
This CL also removes the ability for UpstreamNetworkMonitor's
callers to call registerMobileNetworkRequest or
releaseMobileNetworkRequest. In a future CL, this will be
automatically done by UpstreamNetworkMonitor depending on the
upstream requirements.
This CL is a no-op refactoring with no behaviour changes.
Bug: 173068192
Test: atest TetheringTests
Change-Id: I174f765c616e0dbe2aa493c12613e6131cff0666
Lorenzo Colitticommited 2021-03-31 19:27:17 +09:00
Should not {start, stop} conntrack event monitor on R because
it is used by S feature.
Test: atest TetheringCoverageTests
Change-Id: I57a0a84d46e973660b24fc10d314820ada0d45b9
Starting conntrack event monitor on R devices is unnecessary because
no code uses them.
Bug: 177884581
Test: atest TetheringCoverageTests
Change-Id: I036cb8e29b32a4e220da9a52849b978a6ab821e4
Because most of the tethering tests are unprivileged, we cannot
test this code on real sockets. So use an AF_UNIX socketpair.
Bug: 154669942
Bug: 182785371
Test: test-only change
Change-Id: I843fddb3aaeab33628438f3bcd6a4166062de962
Lorenzo Colittiauthored and Maciej Żenczykowskicommited 2021-03-15 21:01:42 -07:00
Currently, upstream selection is split between the Tethering and
UpstreamNetworkMonitor classes. The UpstreamNetworkMonitor bits
are unit tested, but there are no tests for the interaction of
the two. Add a simple test.
In order to do this, remove the code that controls the
UpstreamNetworkMonitor spy from prepareUsbTethering. This is so
that the new test can call prepareUsbTethering but still rely on
the behaviour of the actual UpstreamNetworkMonitor.
Bug: 173068192
Test: atest TetheringTests
Change-Id: If2ef9af82bc0cbff9172e575ad3d7686e5b492da
Lorenzo Colitticommited 2021-03-12 17:59:02 +09:00
Migrate Maze's BPF program attaching and detaching functions from
system/netd/server/OffloadUtils.{c, h} to tethering module.
Test: atest TetheringCoverageTests
Test case #1:
Enable WiFi hotspot and check tc filters are added or removed on both
wlan1 and rmnet_data#.
$ adb shell tc filter show dev wlan1 ingress
filter protocol ipv6 pref 1 bpf chain 0
filter protocol ipv6 pref 1 bpf chain 0 handle 0x1
prog_offload_schedcls_tether_upstream6_ether:[*fsobj] direct-action
not_in_hw id 2 tag 7cf020cc09a7c982
filter protocol ip pref 2 bpf chain 0
filter protocol ip pref 2 bpf chain 0 handle 0x1
prog_offload_schedcls_tether_upstream4_ether:[*fsobj] direct-action
not_in_hw id 7 tag 2f87d55b636c082c
$ adb shell tc filter show dev rmnet_data2 ingress;
filter protocol ipv6 pref 1 bpf chain 0
filter protocol ipv6 pref 1 bpf chain 0 handle 0x1
prog_offload_schedcls_tether_downstream6_rawip:[*fsobj] direct-action
not_in_hw id 3 tag 8b3885b75bd261de
filter protocol ip pref 2 bpf chain 0
filter protocol ip pref 2 bpf chain 0 handle 0x1
prog_offload_schedcls_tether_downstream4_rawip:[*fsobj] direct-action
not_in_hw id 6 tag b1c9478c91f8df9a
Test case #2:
Enable USB tethering and check tc filters are added or removed on both
rndis0 and rmnet_data#.
Test case #3:
Enable WiFi and USB tethering and check tc filter are added or removed
on rndis0, wlan1 and rmnet_data#.
Change-Id: I3f9a65043271bc8f5bf1b82ae505c471625ca9de
The tethering code still depends on CONNECTIVITY_ACTION for
upstream selection. Make TestConnectivityManager send these
broadcasts.
Bug: 173068192
Test: atest TetheringTests
Change-Id: I6a32e99fafef9d6d2abec438ffc68164ab4c5bdf
Lorenzo Colitticommited 2021-03-09 01:16:35 +09:00
The changes required are:
- Change all usages of when(mCm.method()).thenReturn(...) to
doReturn(...).when(mCm).method() because spies must use the
latter syntax.
- In setDataSaverEnabled, set the mocked return value before
sending the broadcast. Otherwise, the first time the method is
called, the spy will attempt to send the broadcast, and will
crash because it does not have permission to do so.
This does not do anything useful yet, but it will be used in
future CLs.
Bug: 173068192
Test: atest TetheringTests
Change-Id: I968bfa76ead25b2d45ed1c0e8ede32df81401579
Lorenzo Colitticommited 2021-03-04 23:06:52 +09:00
TetheringTest is only able to build UpstreamNetworkState objects
for mobile Internet networks. Support building wifi and dun
versions as well.
Bug: 173068192
Test: atest TetheringTests
Change-Id: Id46f1e5b65dbe04e84a5f56343821af260e2539e
Lorenzo Colitticommited 2021-03-04 23:02:40 +09:00
This allows future tests that want to exercise the interactions
between Tethering and UNM to do so.
Also verify what happens when UNM is initialized, and in setUp,
capture the NetworkCallback it files to track the default
network, so tests can send it NetworkCallbacks. (This callback
is only ever filed once.)
Test: test-only change
Change-Id: Iff9b62120cced41cc61263bfd4fa34f575d0ac00
Lorenzo Colitticommited 2021-03-04 23:02:40 +09:00
Currently, this class is a static inner class of
UpstreamNetworkMonitorTest. Extract it to its own top-level class
so it can be used by other tests.
Bug: 173068192
Test: atest TetheringTests
Change-Id: I6bdb090a99781ac2530b3924ac5c4cf78de315b0
Lorenzo Colitticommited 2021-03-04 23:02:40 +09:00
The flag allows overriding the value of config_tether_upstream_automatic
on released R devices, as issues have been found on devices where an
overlay was used to set it to false.
The flag is only usable on R devices, as S devices can either not set
the setting to false, or fix the underlying issues.
Bug: 173068192
Test: atest TetheringCoverageTests
Change-Id: Id99638916e08e596fab21cedd7bfe39906ce2fe5
This CL adds the counters collected by the tethering programs to
the output of "dumpsys tethering bpf". The counter names are
fetched by JNI code at startup and then read by the debugging
code on demand.
Example from my device:
Forwarding errors:
TCP_CONTROL_PACKET: 67
NON_GLOBAL_SRC: 13
NON_GLOBAL_DST: 17
LOCAL_SRC_DST: 7
Test: manual (debug-only code)
Change-Id: I7ec7992612556a4bca5f1b6bb52c655d6d870201
Lorenzo Colittiauthored and Maciej Żenczykowskicommited 2021-02-10 04:43:03 +00:00
- Add methods to start and stop IPv6 forwarding upstream
- Populate the upstream IPv6 map when the first rule for any
upstream/downstream pair is created.
- Clear the upstream IPv6 map when the last rule for any
upstream/downstream pair is deleted.
Test: Added coverage to IpServerTest and BpfCoordinatorTest
Change-Id: Ib041081e95f5f449489ab63138de034222ffac8f
Lorenzo Colitticommited 2021-01-27 00:52:09 +09:00
The two value types are identical so there is no need to have
separate classes for them.
Test: atest TetheringTests
Change-Id: Ia622b082d0a44373d21f51222f5e675e5bde08e0
Lorenzo Colitticommited 2021-01-27 00:52:09 +09:00
Access the IPv4 downstream and upstream BPF map with the built rules.
Test: atest TetheringCoverageTests
Change-Id: I8cd6e49b377c72250988019eea57f93cccd78309
A preparation for starting monitoring conntrack event which is required
by IPv4 tethering offload.
Test: atest TetheringCoverageTests
Change-Id: Ied46aeca193554f52a90889dfdf92827e94845d6
mForwardedDownstreams is the set of downstreams who wanted upstream.
In other word, it don't contains localOnly tethering(e.g. local only
hotspot, wifi p2p tethering). Changing the list from mForwardedDownstreams
to mNotifyList make both tethered and localOnly tethering have connected
clients callback.
Bug: 172290164
Test: atest TetheringTests
Change-Id: I58fdb28efc616b00d63a1c237ea93aee4d8f2dcd
When user restriction turns on, all tethering functions should
be disabled. But tethering functions still work after
restrication is on. Because tethering request would be removed
from mActiveTetheringRequests after starting tethering that
will result in Tethering#isTetheringActive() always returns
false. Thus, update the design to check tethered interface to
ensure that any of tethering function is working.
Bug: 169596583
Test: atest TetheringTests
Test: Manually test that tethering function would be disabled
and notification would show to user after restriction
was on.
Change-Id: Icb9649a5ecdec2d029ac763b5b9b80042ad50eb9
Tethering unit test would verify the interfaction between DadProxy and
IpServer. Since DadProxy only available in S+, the test would fail if it
build with R sdk.
Bug: 171936270
Test: atest TetheringTests in both R and S
Change-Id: Ia73d4aa59d01400d1ccfd3fdc1b721e269cae952
Lorenzo Colitti
commited 
Maciej Żenczykowski
authored and
Gerrit Code Review
commited 
Hungming Chen
commited 
Treehugger Robot
authored and
Remi NGUYEN VAN
authored and
Bob Badour
authored and
Tomasz Wasilczyk
commited 
markchien
commited 
paulhu
commited 
Baligh Uddin
commited