.. SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

================
bpftool-cgroup
================
-------------------------------------------------------------------------------
tool for inspection and simple manipulation of eBPF progs
-------------------------------------------------------------------------------

:Manual section: 8

.. include:: substitutions.rst

SYNOPSIS
========

**bpftool** [*OPTIONS*] **cgroup** *COMMAND*

*OPTIONS* := { |COMMON_OPTIONS| | { **-f** | **--bpffs** } }

*COMMANDS* :=
{ **show** | **list** | **tree** | **attach** | **detach** | **help** }

CGROUP COMMANDS
===============

| **bpftool** **cgroup** { **show** | **list** } *CGROUP* [**effective**]
| **bpftool** **cgroup tree** [*CGROUP_ROOT*] [**effective**]
| **bpftool** **cgroup attach** *CGROUP* *ATTACH_TYPE* *PROG* [*ATTACH_FLAGS*]
| **bpftool** **cgroup detach** *CGROUP* *ATTACH_TYPE* *PROG*
| **bpftool** **cgroup help**
|
| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* | **name** *PROG_NAME* }
| *ATTACH_TYPE* := { **cgroup_inet_ingress** | **cgroup_inet_egress** |
|     **cgroup_inet_sock_create** | **cgroup_sock_ops** |
|     **cgroup_device** | **cgroup_inet4_bind** | **cgroup_inet6_bind** |
|     **cgroup_inet4_post_bind** | **cgroup_inet6_post_bind** |
|     **cgroup_inet4_connect** | **cgroup_inet6_connect** |
|     **cgroup_unix_connect** | **cgroup_inet4_getpeername** |
|     **cgroup_inet6_getpeername** | **cgroup_unix_getpeername** |
|     **cgroup_inet4_getsockname** | **cgroup_inet6_getsockname** |
|     **cgroup_unix_getsockname** | **cgroup_udp4_sendmsg** |
|     **cgroup_udp6_sendmsg** | **cgroup_unix_sendmsg** |
|     **cgroup_udp4_recvmsg** | **cgroup_udp6_recvmsg** |
|     **cgroup_unix_recvmsg** | **cgroup_sysctl** |
|     **cgroup_getsockopt** | **cgroup_setsockopt** |
|     **cgroup_inet_sock_release** }
| *ATTACH_FLAGS* := { **multi** | **override** }

DESCRIPTION
===========
bpftool cgroup { show | list } *CGROUP* [effective]
    List all programs attached to the cgroup *CGROUP*.

    Output will start with program ID followed by attach type, attach flags and
    program name.

    If **effective** is specified retrieve effective programs that will execute
    for events within a cgroup. This includes inherited along with attached
    ones.

bpftool cgroup tree [*CGROUP_ROOT*] [effective]
    Iterate over all cgroups in *CGROUP_ROOT* and list all attached programs.
    If *CGROUP_ROOT* is not specified, bpftool uses cgroup v2 mountpoint.

    The output is similar to the output of cgroup show/list commands: it starts
    with absolute cgroup path, followed by program ID, attach type, attach
    flags and program name.

    If **effective** is specified retrieve effective programs that will execute
    for events within a cgroup. This includes inherited along with attached
    ones.

bpftool cgroup attach *CGROUP* *ATTACH_TYPE* *PROG* [*ATTACH_FLAGS*]
    Attach program *PROG* to the cgroup *CGROUP* with attach type *ATTACH_TYPE*
    and optional *ATTACH_FLAGS*.

    *ATTACH_FLAGS* can be one of: **override** if a sub-cgroup installs some
    bpf program, the program in this cgroup yields to sub-cgroup program;
    **multi** if a sub-cgroup installs some bpf program, that cgroup program
    gets run in addition to the program in this cgroup.

    Only one program is allowed to be attached to a cgroup with no attach flags
    or the **override** flag. Attaching another program will release old
    program and attach the new one.

    Multiple programs are allowed to be attached to a cgroup with **multi**.
    They are executed in FIFO order (those that were attached first, run
    first).

    Non-default *ATTACH_FLAGS* are supported by kernel version 4.14 and later.

    *ATTACH_TYPE* can be one of:

    - **ingress** ingress path of the inet socket (since 4.10)
    - **egress** egress path of the inet socket (since 4.10)
    - **sock_create** opening of an inet socket (since 4.10)
    - **sock_ops** various socket operations (since 4.12)
    - **device** device access (since 4.15)
    - **bind4** call to bind(2) for an inet4 socket (since 4.17)
    - **bind6** call to bind(2) for an inet6 socket (since 4.17)
    - **post_bind4** return from bind(2) for an inet4 socket (since 4.17)
    - **post_bind6** return from bind(2) for an inet6 socket (since 4.17)
    - **connect4** call to connect(2) for an inet4 socket (since 4.17)
    - **connect6** call to connect(2) for an inet6 socket (since 4.17)
    - **connect_unix** call to connect(2) for a unix socket (since 6.7)
    - **sendmsg4** call to sendto(2), sendmsg(2), sendmmsg(2) for an unconnected udp4 socket (since 4.18)
    - **sendmsg6** call to sendto(2), sendmsg(2), sendmmsg(2) for an unconnected udp6 socket (since 4.18)
    - **sendmsg_unix** call to sendto(2), sendmsg(2), sendmmsg(2) for an unconnected unix socket (since 6.7)
    - **recvmsg4** call to recvfrom(2), recvmsg(2), recvmmsg(2) for an unconnected udp4 socket (since 5.2)
    - **recvmsg6** call to recvfrom(2), recvmsg(2), recvmmsg(2) for an unconnected udp6 socket (since 5.2)
    - **recvmsg_unix** call to recvfrom(2), recvmsg(2), recvmmsg(2) for an unconnected unix socket (since 6.7)
    - **sysctl** sysctl access (since 5.2)
    - **getsockopt** call to getsockopt (since 5.3)
    - **setsockopt** call to setsockopt (since 5.3)
    - **getpeername4** call to getpeername(2) for an inet4 socket (since 5.8)
    - **getpeername6** call to getpeername(2) for an inet6 socket (since 5.8)
    - **getpeername_unix** call to getpeername(2) for a unix socket (since 6.7)
    - **getsockname4** call to getsockname(2) for an inet4 socket (since 5.8)
    - **getsockname6** call to getsockname(2) for an inet6 socket (since 5.8)
    - **getsockname_unix** call to getsockname(2) for a unix socket (since 6.7)
    - **sock_release** closing a userspace inet socket (since 5.9)

bpftool cgroup detach *CGROUP* *ATTACH_TYPE* *PROG*
    Detach *PROG* from the cgroup *CGROUP* and attach type *ATTACH_TYPE*.

bpftool prog help
    Print short help message.

OPTIONS
=======
.. include:: common_options.rst

-f, --bpffs
    Show file names of pinned programs.

EXAMPLES
========
|
| **# mount -t bpf none /sys/fs/bpf/**
| **# mkdir /sys/fs/cgroup/test.slice**
| **# bpftool prog load ./device_cgroup.o /sys/fs/bpf/prog**
| **# bpftool cgroup attach /sys/fs/cgroup/test.slice/ device id 1 allow_multi**

**# bpftool cgroup list /sys/fs/cgroup/test.slice/**

::

    ID       AttachType      AttachFlags     Name
    1        device          allow_multi     bpf_prog1

|
| **# bpftool cgroup detach /sys/fs/cgroup/test.slice/ device id 1**
| **# bpftool cgroup list /sys/fs/cgroup/test.slice/**

::

    ID       AttachType      AttachFlags     Name