Test: new unit test
Change-Id: Ibec09f328e24111aee4760af2f75ea5a80ba84c3

Test: test-only change
Change-Id: I9a47234979cbb161dfcd0c97c54c0476aa753c5e

- 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

The two value types are identical so there is no need to have
separate classes for them.

Test: atest TetheringTests
Change-Id: Ia622b082d0a44373d21f51222f5e675e5bde08e0

* changes:
  merge Tether{Down,Up}stream4{Key,Value} - part 3 - fixups
  merge Tether{Down,Up}stream4{Key,Value} - part 2 - java
  merge Tether{Down,Up}stream4{Key,Value} - part 1 - C portion

These are read-only intents and should not be mutated by any
app receiving them.

Bug: 178324405
Bug: 178249531
Test: atest TetheringTests TetheringCoverageTests GtsTetheringTestCases
Change-Id: I5395e7c19e6453640ad790f2b9a9ba22bbcefa88

Bug: 178324405
Test: atest TetheringTests
Change-Id: I2069ea79f982e6bb197388edd7820a05d1e651f1

Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ia7840698e80ded33d8e0b59efe1ca7267254b892

Generated via:
  git grep 'Tether(Down|Up)stream4(Key|Value)' | cut -d: -f1 | sort -u | while read i; do
    sed -r -i 's@TetherUpstream4Value@Tether4Value@g' "$i"
    sed -r -i 's@TetherDownstream4Value@Tether4Value@g' "$i"
    sed -r -i 's@TetherDownstream4Key@Tether4Key@g' "$i"
    sed -r -i 's@TetherUpstream4Key@Tether4Key@g' "$i"
  done

  cd Tethering/src/com/android/networkstack/tethering
  git mv TetherUpstream4Key.java Tether4Key.java
  git mv TetherUpstream4Value.java Tether4Value.java

  git diff TetherDownstream4Key.java Tether4Key.java
  git diff TetherDownstream4Value.java Tether4Value.java
  git rm TetherDownstream4Key.java
  git rm TetherDownstream4Value.java

Fixup resulting 'import' duplication
  mcedit Tethering/apishim/31/com/android/networkstack/tethering/apishim/api31/BpfCoordinatorShimImpl.java
  mcedit Tethering/apishim/30/com/android/networkstack/tethering/apishim/api30/BpfCoordinatorShimImpl.java
  mcedit Tethering/apishim/common/com/android/networkstack/tethering/apishim/common/BpfCoordinatorShim.java
  mcedit Tethering/tests/unit/src/android/net/ip/IpServerTest.java

Test: N/A, requires follow up commit
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I1dfc3108ca4bbd0cefc3420bc7e421594b62619c

The keys are identical, and the values nearly so, this will make everyone's life easier.

Test: git grep 'Tether(Down|Up)stream4(Key|Value)' finds nothing
  (note this requires follow up commits)
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ifbff2c617ac5834ea80f827eaf89ca81e862baec

* changes:
  [NFCT.TETHER.10] Add/delete IPv4 offload BPF rules to/from BPF map
  [NFCT.TETHER.9] Build IPv4 offload BPF rules for raw ip

Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I0ad143be954d55d0ed39853031c7bd364378e1ec

Access the IPv4 downstream and upstream BPF map with the built rules.

Test: atest TetheringCoverageTests
Change-Id: I8cd6e49b377c72250988019eea57f93cccd78309

Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Icabd1db48a1189425a941384d534c0f18bf20827

Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I649dc490b1883a1e97f748370a77c956f1315e2e

* changes:
  [NFCT.TETHER.8] Prepare the upstream information for IPv4 offload rule
  [NFCT.TETHER.7] Prepare the downstream information for IPv4 offload rule

We want connection establishment/shutdown to flow through
the kernel code path so connection tracking state is at least
somewhat correct.

Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Iee97baa65750188f3436937b16c9b320f0495a5a

Bug: 155176305
Change-Id: I62958d041a8f544dbd98d5434e97ce89f843c5cb

Build the upstream and upstream rules when the conntrack event is
received.

Test: atest TetheringCoverageTests
Change-Id: Ibb52c7b75812bd586091d809e260bc9206c06262

Add upstream interface index and its IPv4 address mapping

Required for building IPv4 forwarding rule when a conntrack event is
received.

Test: atest TetheringCoverageTests
Change-Id: I73f304777704f09481b80d18751e0bab5bab2edc

Add and remove downstream client information to BpfCoordinator

Required for building IPv4 forwarding rule when a conntrack event is
received. The IpServer provides the following elements of a rule which
is not included in conntrack event:
- Downstream interface index
- Downstream Mac address
- Client IP address to Client Mac address

Test: atest TetheringCoverageTests
Change-Id: I84db13acc047ace5730d17f0d3dd99544f516084

Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Idaaa1ede7c239655f5ec489532533c363d297864

A preparation for starting monitoring conntrack event which is required
by IPv4 tethering offload.

Test: atest TetheringCoverageTests
Change-Id: Ied46aeca193554f52a90889dfdf92827e94845d6

Test: atest, TreeHugger, the programs load
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Idcacf0502719336c1b6a959fe6b782f2bce9d6b5

Additionally better document tether stats/limit keys/value.

Test: atest, TreeHugger, the programs load
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I1e1832fc4f5a6704e00ea99ca377988c52a82eb1

* changes:
  switch bpf programs to group network_stack
  Add tethering programs for upstream.

Test: atest, TreeHugger, the programs load
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I3ab4383978acb2681a0fd5aee2700d12c62c2769

Test: atest, TreeHugger, the programs load
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I26bc60c1066ed7317bda48ec3fa701c36e0b46dd

Test: builds, atest, TreeHugger
  git grep 'makeIngressKey|makeIngressValue|BpfIngressMap|TETHER_INGRESS_FS_PATH'
  no longer finds anything
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I27200d33cbc4ea2094b18e05bf93ab54c564da0b

Generated via:
  #!/bin/bash

  do_replace() {
    pushd "$1" >/dev/null
    shift
    git grep "$1" | cut -d: -f1 | sort -u | while read f; do
      sed -i -r "s@$1@$2@g" "${f}"
      git add "${f}"
    done
    popd >/dev/null
  }

  replace() {
    do_replace packages/modules/Connectivity/Tethering "$@"
    do_replace system/netd "$@"
  }

  do_reset() {
    pushd "$1" >/dev/null
    git rhh
    popd >/dev/null
  }

  main() {
    do_reset packages/modules/Connectivity/Tethering
    do_reset system/netd

    replace TetherIngressKey TetherDownstream6Key
    replace TetherIngressValue TetherDownstream6Value

    pushd packages/modules/Connectivity/Tethering/src/com/android/networkstack/tethering >/dev/null
    git mv TetherIngressKey.java TetherDownstream6Key.java
    git mv TetherIngressValue.java TetherDownstream6Value.java
    popd >/dev/null

    replace TETHER_INGRESS_PROG TETHER_DOWNSTREAM6_TC_PROG
    replace ingress_tether tether_downstream6
    replace ingress/tether_ tether_downstream6_
    replace TETHER_INGRESS_MAP TETHER_DOWNSTREAM6_MAP
    replace tether_ingress_map tether_downstream6_map

    replace getTetherIngressMapFd getTetherDownstream6MapFd
    replace getTetherIngressProgFd getTetherDownstream6TcProgFd

    replace mBpfIngressMap mBpfDownstream6Map
    replace bpfIngressMap bpfDownstream6Map
    replace printIngressMap printDownstream6Map
    replace 'BPF ingress map' 'BPF downstream ipv6 map'
  }

  main "$@"; exit

Followed by:
  cd system/netd
  # change regexp in tests/binder_test.cpp:3374
  git add tests/binder_test.cpp

(and whitespace adjustments to prevent lines from going over 100 characters)

Afterwards we have:
  $ adbz shell ls /sys/fs/bpf/tethering
  map_offload_tether_downstream6_map
  map_offload_tether_limit_map
  map_offload_tether_stats_map
  map_test_tether_downstream6_map
  prog_offload_schedcls_tether_downstream6_ether
  prog_offload_schedcls_tether_downstream6_rawip
  prog_test_xdp_drop_ipv4_udp_ether

Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ib04dc0c6e3d034461f3f84e09f6fa93a862e1bb2

Test: builds, boots, program present
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Id5be48ec172366296929875856a3d17ecc87e84b

I keep on failing to find this using grep because it
doesn't match how all the other programs are defined,
so change it for consistency.

Test: builds, atest, TreeHugger
Signed-off-by: Maciej <Żenczykowski&lt;maze@google.com>
Change-Id: Ib61b375bef84d2b489080866b2411c84880e4ef2

that puts tethering mainline module maps and programs
under /sys/fs/bpf/tethering

Test: builds, boots, atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: If57e737168cefe9fe0fe180114c1d61918d20d21

since there's now bpf code in tethering portion of the codebase.

Test: N/A
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I679b7ba6d5fff49bad4fb2fe7d251875e4cb94b5

* changes:
  [NFCT.TETHER.6] Migrate tetherOffloadGetAndClearStats from netd to mainline
  [NFCT.TETHER.5] Migrate tetherOffloadSetInterfaceQuota from netd to mainline

* changes:
  [NFCT.TETHER.4] Migrate tetherOffloadRuleRemove from netd to mainline
  [NFCT.TETHER.3] Migrate tetherOffloadGetStats from netd to mainline