This package is using some common utilities from
a library that used to live in the network stack.
A better home for these utilities is frameworks/libs,
so this topic moves the files ther and also changes
the package of some utilities.

See aosp/1350222 and aosp/1350182 for a detailed
description of the specific files that moved.

Test: checkbuild
Change-Id: I76a9b7790f3997e3e6b3c2f75ba6308286457cde

If dhcp server is obsolete, explicitly stop it to shut down its thread.

Bug: 161418295
Test: atest CtsTetheringTest
Change-Id: Ic5b876bd23711ec8d832879a7baee0495246b218

Create TetheringPrivilegedTests which have MAINLINE_NETWORK_STACK
permission, the test can perform various network-related operations
which need CAP_NET_RAW and CAP_NET_ADMIN capabilities.

Bug: 145490751
Test: make TetheringPrivilegedTests
Change-Id: Ic205e5183e066766377c63336d9c5171d4875c6a

Test: build / treehugger
Bug: 146727827
Exempt-From-Owner-Approval: Cherry-picking from goog/master to aosp/master
Merged-in: Ie1ad6711c490c679ebcfacd97154380a8810ba1c
Change-Id: Ie1ad6711c490c679ebcfacd97154380a8810ba1c

Do not run ethernet tethering tests if tethering is not supported
because Tethering APIs would fail. Also skip the test if
EthernetManager is not avaliable. EthernetManager would be null if
there are no FEATURE_ETHERNET and FEATURE_USB_HOST.

Bug: 159869957
Test: atest CtsTetheringTest
Change-Id: I2b9be6799c6edeefc8cd74897a8704dbe80dd061

This reverts commit cf86031c.

Reason for revert: Breaks the build b/160390899

Merged-In: Icd141a992c46290c74929785e261a1cd57bc001b
Change-Id: Ie10e66f61393602f17fbb61bf17230b176bf1f44

If the test run adb over network and ethernet is available, it is likely
that adb may run over ethernet. Then the test would fail because adb
would break when ethernet is switching from client mode to server mode.

Bug: 160389275
Test: atest CtsTetheringTest

Change-Id: I57d365d33316881c50c3bf7fd1c98926d10842d3

The classes should not be picked up from frameworks/base, as they are
part of several mainline modules.

Also refine comments in DhcpResults following feedback in previous
change.

(cherry-pick from internal branch skipping wifi classes; no other
conflict)

Bug: 151052811
Test: m; manual: flashed, wifi and telephony working
Test: atest NetworkStackCoverageTests
Merged-In: I7074651c6a2a7a6b11bcf13cc4bb03833d7d655f

Change-Id: I7074651c6a2a7a6b11bcf13cc4bb03833d7d655f

LocalLog is in android.util* instead of android.net*.
No crash happen becaue the methods used by tethering are
@UnsupportedAppUsage.

Bug: 160113128
Test: atest TetheringTests
(cherry-pick from internal branch with conflicts)
Merged-In: I5f070b96f96aaabf7ec8da52a3d3444ed940fb56

Change-Id: I5f070b96f96aaabf7ec8da52a3d3444ed940fb56

TetheringNotificationUpdater create a PendingIntent with
Intent#FLAG_ACTIVITY_NEW_TASK flag. But this flag is used for
Intent only. Thus, move this flag into Intent.

Bug: 158639789
Test: atest TetheringTests
Change-Id: I4c3af75c87b797bcde9356a94c835c7422dac1c6

* changes:
  Update to use nativehelper/JNIPlatformHelp.h
  Sync with libnativehelper refactoring

jniGetFDFromFileDescriptor() is now a legacy method and moved to a
separate header.

Bug: 151443957
Bug: 158749603
Test: m
Change-Id: Icd06e9a315680c2251dbb9032a904dd6d66aa359
Merged-In: Icd06e9a315680c2251dbb9032a904dd6d66aa359
Exempt-From-Owner-Approval: cherry pick
(cherry picked from commit a5c46825)

This class might be used by some mainline modules.

Bug: 151052811
Test: atest DnsPacketTest
Test: atest DnsResolverTest
(clean cherry-pick from internal branch)
Merged-In: I8841d91456952ded5efbf8ea221289aecc7746ad
Change-Id: I8841d91456952ded5efbf8ea221289aecc7746ad

This change is a combination of following changes:

1) Tethering: add TETHERING_WIGIG type
   Currently both WIFI and WIGIG use the same tethering type,
   TETHERING_WIFI. This causes conflicts between the frameworks,
   when both WIFI and WIGIG SoftAPs are started, one or both will
   not work.
   Fix this by using a seperate tethering type for WIGIG.

2) Tethering: remove TETHERING_WIGIG state machine on interface down
   The wigig state machine relies on a TETHERING_STATE_CHANGED broadcast
   that is sent when the tethering state machine is first created, during
   interface up. Currently the tethering state machine is not removed
   on interface down except for TETHERING_BLUETOOTH, and as a result
   wigig tethering only works the first time SoftAP is started.
   In order to fix this, remove the tethering state machine on interface
   down for TETHERING_WIGIG as well.

Bug: 143356416
Test: TetheringCoverageTests

Change-Id: Ic4d3aca0ed69234093af7f0206dab3335938c52a

Development branches should use the -unstable version of the
NetworkStack AIDLs so that refreezing is not necessary for each
modification.
The versions will be re-frozen before each release instead.

Bug: 157534516
Test: m
Merged-In: I74b4a16266bda7b8ac740b3a0193268da260fc2f
Change-Id: I1c2fe707d865e6a1953b4ab82194d4b9132258f9

There is a protection in Settings that Settings would gray out if
tethering requires entitlement check but the entitlement app is
invalid. Tethering resource is moved from framework to tethering
module, so Settings can not fetch entitlement app name anymore.

In this change, tethering module would check whether entitltement app
package name is exsited if entitlement check is needed. Tethering would
be not supported (Settings tethering option would be hidded) if
entitlement app is not installed.

After moving the protection into tethering module,
TetherUtil#isProvisioningNeeded is no longer needed. Because The
only use case is Settings wants to gray out tethering setting
when entitltement check is needed but entitlement app is invalid.

Bug: 146918263
Test: atest TetheringCoverageTests
Change-Id: I9a5ff5dbc1db3f3be7fcd7146862a16b373507e6
Merged-In: I9a5ff5dbc1db3f3be7fcd7146862a16b373507e6

Tethering resource configuration is move from framwork to tethering
module. Since tethering resource would not be accessible from outside
of tethering module, EntitlementManager would tell Settings the
entitlement configuration via intent extra when run entitlement check.

Bug: 146918263
Test: atest TetheringTests
Change-Id: I6f23553bb1da5f0b767f920b32a86fafb9e00b9e
Merged-In: I6f23553bb1da5f0b767f920b32a86fafb9e00b9e

When LAN link is changed for using ethernet interface from Ethernet tethering to Ethernet,
there is confiict as Ethernet Tethering is trying to make ethernet link down and Ethernet is trying to make ethernet link up.

So, this would make Ethernet only manage ethernet interface link state.

Test: manual
Bug: 130840861
Change-Id: I1cd40ae764bdeecbb59e3889e9399b7f4b05f9cc

Bug: 159097215
Test: test-only change
Change-Id: I2292c1cbff06a304f70191b88d833b19af2b8b92

1. When Wi-Fi enabled, ap0 interface is added and IpNeighborMonitor's
   start() is invoked in IpServer's constructor.
2. There's no stop for IpNeighborMonitor when IpServer stop.
3. During overnight test for Wi-Fi, networkstack is too slow to
   process request due to memory leak in IpNeighborMonitor and
   binder buffer is blocked causing exception.
Solution: Invoke IpNeighborMonitor.stop() in UnavailableState.enter().

Bug: 159097215
Test: automatic, turn on and off Wi-Fi every 6 seconds overnight
Change-Id: I8f60c13706f05306e8f25a15f7861d7ecabbc10e

Bug: 158961959
Test: build/make/tools/checkowners.py packages/NetworkStack/OWNERS
Test: ./build/make/tools/checkowners.py \
frameworks/base/packages/Tethering/OWNERS

Change-Id: I13b291e5db6a8a8c9f2bfa477acabaea250aa48c

Bug: 150736748
Test: BpfCoordinatorTest
Change-Id: I7f8dde3b57ee14eb33edbe2fd383df33cccc231c

Bug: 150736748
Test: BpfCoordinatorTest
Change-Id: Iedb936b7592b6be773d1b84a2498bfc5a440a198

Bug: 150736748
Test: BpfCoordinatorTest
Change-Id: Id413b7f2f7edb2e5c3e02d5677fe536ed52fbbcb

$ adb shell dumpsys tethering
BPF offload:
  Polling started
  Stats provider registered
  Upstream quota: {rmnet_data2=9223372036854775807}
  Forwarding stats:
    12(rmnet_data2) - ForwardedStats(rxb: 1065, rxp: 5, txb: 0, txp: 0)
  Forwarding rules:
    [wlan1]: iif(iface) oif(iface) v6addr srcmac dstmac
      12(rmnet_data2) 31(wlan1) /2401:e180:8831:77ae:a900:a03b:41fb..

Bug: 150736748
Test: Enable tethering on mobile data and check dumpsys tethering
Change-Id: I95ea3050d92f3ba8136a63cd399d3450d183c8dc

The applying data limit is based on the forwarding rule changes.
Add the tests for verifying their interactions with netd.

Bug: 150736748
Test: BpfCoordinatorTest
Change-Id: I5a98c4cd74e2de6005ee05defa761f6af3fd4e75