================
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bpftool-cgroup
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================
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-------------------------------------------------------------------------------
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tool for inspection and simple manipulation of eBPF progs
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-------------------------------------------------------------------------------
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:Manual section: 8
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SYNOPSIS
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========
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**bpftool** [*OPTIONS*] **cgroup** *COMMAND*
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*OPTIONS* := { { **-j** | **--json** } [{ **-p** | **--pretty** }] | { **-f** | **--bpffs** } }
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*COMMANDS* :=
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{ **show** | **list** | **tree** | **attach** | **detach** | **help** }
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MAP COMMANDS
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=============
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| **bpftool** **cgroup { show | list }** *CGROUP*
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| **bpftool** **cgroup tree** [*CGROUP_ROOT*]
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| **bpftool** **cgroup attach** *CGROUP* *ATTACH_TYPE* *PROG* [*ATTACH_FLAGS*]
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| **bpftool** **cgroup detach** *CGROUP* *ATTACH_TYPE* *PROG*
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| **bpftool** **cgroup help**
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| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* }
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| *ATTACH_TYPE* := { **ingress** | **egress** | **sock_create** | **sock_ops** | **device** |
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| **bind4** | **bind6** | **post_bind4** | **post_bind6** | **connect4** | **connect6** |
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| **sendmsg4** | **sendmsg6** }
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| *ATTACH_FLAGS* := { **multi** | **override** }
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DESCRIPTION
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===========
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**bpftool cgroup { show | list }** *CGROUP*
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List all programs attached to the cgroup *CGROUP*.
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Output will start with program ID followed by attach type,
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attach flags and program name.
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**bpftool cgroup tree** [*CGROUP_ROOT*]
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Iterate over all cgroups in *CGROUP_ROOT* and list all
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attached programs. If *CGROUP_ROOT* is not specified,
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bpftool uses cgroup v2 mountpoint.
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The output is similar to the output of cgroup show/list
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commands: it starts with absolute cgroup path, followed by
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program ID, attach type, attach flags and program name.
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**bpftool cgroup attach** *CGROUP* *ATTACH_TYPE* *PROG* [*ATTACH_FLAGS*]
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Attach program *PROG* to the cgroup *CGROUP* with attach type
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*ATTACH_TYPE* and optional *ATTACH_FLAGS*.
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*ATTACH_FLAGS* can be one of: **override** if a sub-cgroup installs
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some bpf program, the program in this cgroup yields to sub-cgroup
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program; **multi** if a sub-cgroup installs some bpf program,
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that cgroup program gets run in addition to the program in this
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cgroup.
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Only one program is allowed to be attached to a cgroup with
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no attach flags or the **override** flag. Attaching another
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program will release old program and attach the new one.
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Multiple programs are allowed to be attached to a cgroup with
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**multi**. They are executed in FIFO order (those that were
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attached first, run first).
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Non-default *ATTACH_FLAGS* are supported by kernel version 4.14
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and later.
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*ATTACH_TYPE* can be on of:
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**ingress** ingress path of the inet socket (since 4.10);
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**egress** egress path of the inet socket (since 4.10);
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**sock_create** opening of an inet socket (since 4.10);
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**sock_ops** various socket operations (since 4.12);
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**device** device access (since 4.15);
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**bind4** call to bind(2) for an inet4 socket (since 4.17);
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**bind6** call to bind(2) for an inet6 socket (since 4.17);
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**post_bind4** return from bind(2) for an inet4 socket (since 4.17);
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**post_bind6** return from bind(2) for an inet6 socket (since 4.17);
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**connect4** call to connect(2) for an inet4 socket (since 4.17);
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**connect6** call to connect(2) for an inet6 socket (since 4.17);
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**sendmsg4** call to sendto(2), sendmsg(2), sendmmsg(2) for an
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unconnected udp4 socket (since 4.18);
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**sendmsg6** call to sendto(2), sendmsg(2), sendmmsg(2) for an
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unconnected udp6 socket (since 4.18).
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**bpftool cgroup detach** *CGROUP* *ATTACH_TYPE* *PROG*
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Detach *PROG* from the cgroup *CGROUP* and attach type
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*ATTACH_TYPE*.
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**bpftool prog help**
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Print short help message.
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OPTIONS
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=======
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-h, --help
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Print short generic help message (similar to **bpftool help**).
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-v, --version
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Print version number (similar to **bpftool version**).
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-j, --json
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Generate JSON output. For commands that cannot produce JSON, this
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option has no effect.
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-p, --pretty
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Generate human-readable JSON output. Implies **-j**.
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-f, --bpffs
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Show file names of pinned programs.
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EXAMPLES
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========
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| **# mount -t bpf none /sys/fs/bpf/**
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| **# mkdir /sys/fs/cgroup/test.slice**
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| **# bpftool prog load ./device_cgroup.o /sys/fs/bpf/prog**
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| **# bpftool cgroup attach /sys/fs/cgroup/test.slice/ device id 1 allow_multi**
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**# bpftool cgroup list /sys/fs/cgroup/test.slice/**
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::
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ID AttachType AttachFlags Name
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1 device allow_multi bpf_prog1
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| **# bpftool cgroup detach /sys/fs/cgroup/test.slice/ device id 1**
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| **# bpftool cgroup list /sys/fs/cgroup/test.slice/**
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::
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ID AttachType AttachFlags Name
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SEE ALSO
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========
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**bpftool**\ (8), **bpftool-prog**\ (8), **bpftool-map**\ (8)
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