BUG: 167962976
Test: TH
Change-Id: Id28881b35cf24fc9517fa11af6d8e539ab244fa6

Also jarjar com.android.net.module.util* to
com.android.networkstack.tethering.util*.

Bug: 171670016
Test: atest TetheringCoverageTests
Change-Id: I3bde9ad3c41adf36da99bd944303d88ce992201c

Auto-generated-cl: translation import
Change-Id: I34e8bcf3c3f0a5db3522b6ff499ba1583577b250

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1461742

Change-Id: I6055ea6ac737bb94bd9bc8c8642e86222f1e1d1a

Also add MtsTetheringTest which only run if tethering mainline
module is installed.

Bug: 166057846
Bug: 170265597
Test: atest TetheringTests
Change-Id: I434dda81eb5fab700d873a8ff3429b4222f0c7e6

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1459887

Change-Id: I2874508c560cc31f99e88c02fd63995f62f86a2f

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1460522

Change-Id: I3dcf776384d6c53876acaeb344820a88c19027da

The downstream do not be tracked if PrivateAddressCoordinator just
return cached address. Then, PrivateAddressCoordinator would not notify
that downstream if conflict happen.

Also remove the null check in getDownstreamPrefix because:
- An IpServer is only added to mDownstreams by requestDownstreamAddress.
- That method will only add the IpServer to mDownstreams if it has an
IPv4 address.
- As soon as that method returns, the IpServer sets mIpv4Address to the
address that was returned.
- When an IpServer is torn down, mIpv4Address is set to null after
releaseDownstream is called.

So it should never be possible for this to return null.

Bug: 168169687
Test: atest CtsTetheringTest
      atest TetheringTests
Change-Id: Ide5206b013acdc499344e1c839a830c5b245af41

Modules shouldn't have TestApis, as documented in go/android-api-types.
Additionally, nothing depends on these TestApis existing.

Bug: 170395679
Test: m checkapi
Change-Id: I6e2c8298e90b4b54f0264be974d036fa08cd5632
Merged-In: I6e2c8298e90b4b54f0264be974d036fa08cd5632

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1459889

Change-Id: Ib9be992d5728346f063cea6ebc67b11a209e04c4

This test catch the regression introduced in r.android.com/1432958.

Bug: 1432958
Test: atest TetheringTest

Change-Id: Id0c1afb5563954ffee1f598a3a5de6a245d77a0e

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1436852

Change-Id: Ief2520cd30059542ae3786a36b92198af6739a2a

Currently tethering only pick prefix from 192.168.0.0/16. There is no
aviable tethering address if the upstream address is 192.168.x.y/16.
This change allow tethering to pick prefix from any private address
rnages. Now it still pick from 192.168.0.0/16 only to avoid behavior
change. Will have follow up commit to change the configuration.

Bug: 166057846
Bug: 170265597
Test: atest TetheringTests
      atest CtsTetheringTest

Change-Id: Ib6304eb8b4788e9196d0af48e72f00a6bda73a5f

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1440214

Change-Id: I2e8d55b7984bccbd5959b7b00fa8c8b24acdb67c

The test had TODOs to address to use IpUtils and NetworkStackConstants
classes once they were moved to frameworks/libs/net. This is now done,
so using the new classes.

Bug: 158042941
Test: atest TetheringPrivilegedTests
Change-Id: I536b4506dbc3b42547ba9cb4e7c3c7a3e9459dd1

Bug: 167233921
Merged-In: Iecef31f7bf10ad97b7e0075cf302ae94e248474a
Change-Id: I9e9c873bc2e05a0cfe3af0bf74725500f3f108db

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1440234

Change-Id: Ibd41a02a9a185667a7fe332213ef692c4d8bf515

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1432958

Change-Id: I0aaa978e8edd7e8666413fb18352fa83e9fb5469

Make the IP subnet persistent if it do not conflict with upstream.
It allow client to reuse its IP that usually reduce DHCP procedure.

Bug: 168169687
Test: atest TetheringTests
Change-Id: Iddc5304730dce7b11c5d124b7eddce057d752bbd

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1448635

Change-Id: I6ef1bfbf4dcd39983e94207ff7f760e152da2a97

This works around a build-system limitation where it does not know
which jars to feed r8 to resolve all classes during proguarding.

Bug: 160453030
Bug: 169931783
Test: build_mainline_modules.sh (with prebuilt sdk)
Change-Id: I3d9f2049cf898b5e551a5c5764df423abaa5e92d
Merged-In: I3d9f2049cf898b5e551a5c5764df423abaa5e92d

The utility classes are useful for mainline modules and their tests, for
example IpClientIntegrationTest.

Bug: 168868607
Test: m && atest NetworkStaticLibTests
Change-Id: If2b1613aa18a7990391e2d31cc2951ca93f1cf3c

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1413610

Change-Id: I0a5398513c4572db839e3713109bb326f0261954

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1440767

Change-Id: If1d0eb5a1818dd7a9346f8d0d64d5f37ea1b53c2

r.android.com/1424920 changed the code but forgot to update the
unit test.

Also fix some lint errors.

Bug: 149109043
Test: atest TetheringTests TetheringPrivilegedTests
Change-Id: I53ca4b9877dcb4a759dee6ec63133653315d826f

Add the netfilter generic message header to
the netlink req. This is needed so the kernel
won't ignore the request for invalid params.

Bug: 149109043
Test: ConntrackSocketTest
Change-Id: I1757fdeb11a0cac5821021a22323cbd74fe22bdc

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1435273

Change-Id: Ibb30260e9bc558ab0aa6dd8277dfd50efd14258f

If vpn app make its netmask as 0, PrivateAddressCoordinator
would not able to find suitable address for tethering downstream.
Since tethering do not support vpn as upstream, just ignore vpn
in PrivateAddressCoordinator.

Bug: 166365863
Test: atest TetheringTests
      atest CtsTetheringTest
Change-Id: Iabe265467044fea9fa437674ca29ffc7bcdefe3b

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1440032

Change-Id: Id8904075001709f2c62a55293f835c5a73ad9d79

NetworkInterface#getByName can not get the interface without IP addresses.
When setIncludeTestInterfaces(true) is called, the interface will be
placed in client mode, which will delete the link-local address. So calling
NetworkInterface#getByName to get test interface may not work before
switching to server mode.

Bug: 168215721
Test: atest CtsTethering
Change-Id: Ice8adcce1c4b2c86bd219c701b2afa9ba2339f24

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1433924

Change-Id: I30a1542c1fe2056d074402f2b5f7be2a37f15373