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Filename Latest commit message Latest commit date
Maciej Żenczykowski 5885059bb3 ANDROID: net: bpf: permit redirect from ingress L3 to egress L2 devices at near max mtu 
__bpf_skb_max_len(skb) is used from:
  bpf_skb_adjust_room
  __bpf_skb_change_tail
  __bpf_skb_change_head

but in the case of forwarding we're likely calling these functions
during receive processing on ingress and bpf_redirect()'ing at
a later point in time to egress on another interface, thus these
mtu checks are for the wrong device (input instead of output).

This is particularly problematic if we're receiving on an L3 1500 mtu
cellular interface, trying to add an L2 header and forwarding to
an L3 mtu 1500 mtu wifi/ethernet device (which is thus L2 1514).

The mtu check prevents us from adding the 14 byte ethernet header prior
to forwarding the packet.

After the packet has already been redirected, we'd need to add
an additional 2nd ebpf program on the target device's egress tc hook,
but then we'd also see non-redirected traffic and have no easy
way to tell apart normal egress with ethernet header packets
from forwarded ethernet headerless packets.

Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Maciej Żenczykowski <maze@google.com>

Link: https://patchwork.ozlabs.org/project/netdev/patch/20200507023606.111650-1-zenczykowski@gmail.com/
But note that a more thorough solution will be pursued.

Bug: 149816401
Change-Id: If55a144d7822e23bce85f65897bca7de4e0f9b24
2020-05-29 23:48:36 +00:00
arch ANDROID: sdcardfs: remove sdcardfs from system 2020-05-29 14:48:37 +02:00
block ANDROID: block: backport the ability to specify max_dun_bytes 2020-05-15 22:01:33 +00:00
certs
crypto This is the 5.4.42 stable release 2020-05-20 12:49:59 +02:00
Documentation Merge remote-tracking branch 'aosp/upstream-f2fs-stable-linux-5.4.y' into android-5.4-stable 2020-05-27 13:35:01 -07:00
drivers FROMGIT: driver core: Update device link status correctly for SYNC_STATE_ONLY links 2020-05-28 21:46:38 +00:00
fs Revert "ANDROID: sdcardfs: Enable modular sdcardfs" 2020-05-29 15:08:00 +02:00
include Revert "ANDROID: vfs: Add setattr2 for filesystems with per mount permissions" 2020-05-29 14:48:38 +02:00
init This is the 5.4.42 stable release 2020-05-20 12:49:59 +02:00
ipc Revert "ANDROID: vfs: Add permission2 for filesystems with per mount permissions" 2020-05-29 14:48:37 +02:00
kernel This is the 5.4.43 stable release 2020-05-28 12:26:15 +02:00
lib This is the 5.4.43 stable release 2020-05-28 12:26:15 +02:00
LICENSES
mm This is the 5.4.43 stable release 2020-05-28 12:26:15 +02:00
net ANDROID: net: bpf: permit redirect from ingress L3 to egress L2 devices at near max mtu 2020-05-29 23:48:36 +00:00
samples This is the 5.4.36 stable release 2020-04-29 17:24:24 +02:00
scripts This is the 5.4.43 stable release 2020-05-28 12:26:15 +02:00
security Revert "ANDROID: sdcardfs: Enable modular sdcardfs" 2020-05-29 15:08:00 +02:00
sound This is the 5.4.43 stable release 2020-05-28 12:26:15 +02:00
tools This is the 5.4.43 stable release 2020-05-28 12:26:15 +02:00
usr initramfs: restore default compression behavior 2020-04-08 09:08:38 +02:00
virt KVM: arm: vgic: Synchronize the whole guest on GIC{D,R}_I{S,C}ACTIVER read 2020-05-20 08:20:04 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
abi_gki_aarch64.xml ANDROID: GKI: update abi definitions now that sdcardfs is gone 2020-05-29 15:27:58 +02:00
abi_gki_aarch64_cuttlefish_whitelist ANDROID: remove sdcardfs-needed exports from whitelist 2020-05-29 14:57:33 +02:00
abi_gki_aarch64_db845c_whitelist ANDROID: remove sdcardfs-needed exports from whitelist 2020-05-29 14:57:33 +02:00
abi_gki_aarch64_exynos_whitelist ANDROID: remove sdcardfs-needed exports from whitelist 2020-05-29 14:57:33 +02:00
abi_gki_aarch64_goldfish_whitelist ANDROID: remove sdcardfs-needed exports from whitelist 2020-05-29 14:57:33 +02:00
abi_gki_aarch64_hikey960_whitelist ANDROID: abi_gki_aarch64_hikey960_whitelist: remove stale symbols 2020-05-01 10:13:54 +01:00
abi_gki_aarch64_qcom_whitelist ANDROID: remove sdcardfs-needed exports from whitelist 2020-05-29 14:57:33 +02:00
abi_gki_aarch64_sunxi_whitelist ANDROID: abi_gki_aarch64_sunxi_whitelist: remove stale symbols 2020-05-01 10:13:55 +01:00
abi_gki_aarch64_unisoc_whitelist ANDROID: remove sdcardfs-needed exports from whitelist 2020-05-29 14:57:33 +02:00
abi_gki_aarch64_whitelist
build.config.aarch64 ANDROID: add compat cross compiler 2020-04-27 20:20:28 -07:00
build.config.allmodconfig ANDROID: fix allmodconfig build to use the right toolchain 2020-04-14 15:39:56 +00:00
build.config.allmodconfig.aarch64
build.config.allmodconfig.arm
build.config.allmodconfig.x86_64
build.config.arm
build.config.common ANDROID: clang: update to 11.0.1 2020-05-18 19:34:46 +00:00
build.config.db845c ANDROID: db845c build: Use merge_configs 2020-04-01 14:04:53 +00:00
build.config.gki
build.config.gki-debug.aarch64 ANDROID: Fix build.config.gki-debug 2020-05-04 09:11:56 +01:00
build.config.gki-debug.x86_64 ANDROID: Fix build.config.gki-debug 2020-05-04 09:11:56 +01:00
build.config.gki.aarch64 ANDROID: Enforce KMI stability 2020-05-06 12:10:15 +00:00
build.config.gki.x86_64
build.config.gki_kasan ANDROID: Rename build.config.gki.arch_kasan 2020-05-05 20:50:24 +00:00
build.config.gki_kasan.aarch64 ANDROID: Drop ABI monitoring from KASAN build config 2020-05-06 16:43:25 +00:00
build.config.gki_kasan.x86_64 ANDROID: Rename build.config.gki.arch_kasan 2020-05-05 20:50:24 +00:00
build.config.hikey960
build.config.x86_64
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile This is the 5.4.43 stable release 2020-05-28 12:26:15 +02:00
README
README.md

README.md

How do I submit patches to Android Common Kernels

  1. BEST: Make all of your changes to upstream Linux. If appropriate, backport to the stable releases. These patches will be merged automatically in the corresponding common kernels. If the patch is already in upstream Linux, post a backport of the patch that conforms to the patch requirements below.

  2. LESS GOOD: Develop your patches out-of-tree (from an upstream Linux point-of-view). Unless these are fixing an Android-specific bug, these are very unlikely to be accepted unless they have been coordinated with kernel-team@android.com. If you want to proceed, post a patch that conforms to the patch requirements below.

Common Kernel patch requirements

  • All patches must conform to the Linux kernel coding standards and pass script/checkpatch.pl
  • Patches shall not break gki_defconfig or allmodconfig builds for arm, arm64, x86, x86_64 architectures (see https://source.android.com/setup/build/building-kernels)
  • If the patch is not merged from an upstream branch, the subject must be tagged with the type of patch: UPSTREAM:, BACKPORT:, FROMGIT:, FROMLIST:, or ANDROID:.
  • All patches must have a Change-Id: tag (see https://gerrit-review.googlesource.com/Documentation/user-changeid.html)
  • If an Android bug has been assigned, there must be a Bug: tag.
  • All patches must have a Signed-off-by: tag by the author and the submitter

Additional requirements are listed below based on patch type

Requirements for backports from mainline Linux: UPSTREAM:, BACKPORT:

  • If the patch is a cherry-pick from Linux mainline with no changes at all
    • tag the patch subject with UPSTREAM:.
    • add upstream commit information with a (cherry-picked from ...) line
    • Example:
      • if the upstream commit message is
        important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

    - then Joe Smith would upload the patch for the common kernel as

        UPSTREAM: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        (cherry-picked from c31e73121f4c1ec41143423ac6ce3ce6dafdcec1)
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch requires any changes from the upstream version, tag the patch with BACKPORT: instead of UPSTREAM:.
    • use the same tags as UPSTREAM:
    • add comments about the changes under the (cherry-picked from ...) line
    • Example:
        BACKPORT: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        (cherry-picked from c31e73121f4c1ec41143423ac6ce3ce6dafdcec1)
        [ Resolved minor conflict in drivers/foo/bar.c ]
        Signed-off-by: Joe Smith <joe.smith@foo.org>

Requirements for other backports: FROMGIT:, FROMLIST:,

  • If the patch has been merged into an upstream maintainer tree, but has not yet been merged into Linux mainline
    • tag the patch subject with FROMGIT:
    • add info on where the patch came from as (cherry picked from commit <sha1> <repo> <branch>). This must be a stable maintainer branch (not rebased, so don't use linux-next for example).
    • if changes were required, use BACKPORT: FROMGIT:
    • Example:
      • if the commit message in the maintainer tree is
        important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

    - then Joe Smith would upload the patch for the common kernel as

        FROMGIT: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        (cherry picked from commit 878a2fd9de10b03d11d2f622250285c7e63deace
         https://git.kernel.org/pub/scm/linux/kernel/git/foo/bar.git test-branch)
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch has been submitted to LKML, but not accepted into any maintainer tree
    • tag the patch subject with FROMLIST:
    • add a Link: tag with a link to the submittal on lore.kernel.org
    • if changes were required, use BACKPORT: FROMLIST:
    • Example:
        FROMLIST: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Link: https://lore.kernel.org/lkml/20190619171517.GA17557@someone.com/
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>

Requirements for Android-specific patches: ANDROID:

  • If the patch is fixing a bug to Android-specific code
    • tag the patch subject with ANDROID:
    • add a Fixes: tag that cites the patch with the bug
    • Example:
        ANDROID: fix android-specific bug in foobar.c

        This is the detailed description of the important fix

        Fixes: 1234abcd2468 ("foobar: add cool feature")
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch is a new feature
    • tag the patch subject with ANDROID:
    • add a Bug: tag with the Android bug (required for android-specific features)