linux/tools/bpf/bpftool/Documentation/bpftool-net.rst

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

================
bpftool-net
================
-------------------------------------------------------------------------------
tool for inspection of networking related bpf prog attachments
-------------------------------------------------------------------------------

:Manual section: 8

.. include:: substitutions.rst

SYNOPSIS
========

**bpftool** [*OPTIONS*] **net** *COMMAND*

*OPTIONS* := { |COMMON_OPTIONS| }

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

NET COMMANDS
============

| **bpftool** **net** { **show** | **list** } [ **dev** *NAME* ]
| **bpftool** **net attach** *ATTACH_TYPE* *PROG* **dev** *NAME* [ **overwrite** ]
| **bpftool** **net detach** *ATTACH_TYPE* **dev** *NAME*
| **bpftool** **net help**
|
| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* | **name** *PROG_NAME* }
| *ATTACH_TYPE* := { **xdp** | **xdpgeneric** | **xdpdrv** | **xdpoffload** }

DESCRIPTION
===========
bpftool net { show | list } [ dev *NAME* ]
    List bpf program attachments in the kernel networking subsystem.

    Currently, device driver xdp attachments, tcx, netkit and old-style tc
    classifier/action attachments, flow_dissector as well as netfilter
    attachments are implemented, i.e., for program types **BPF_PROG_TYPE_XDP**,
    **BPF_PROG_TYPE_SCHED_CLS**, **BPF_PROG_TYPE_SCHED_ACT**,
    **BPF_PROG_TYPE_FLOW_DISSECTOR**, **BPF_PROG_TYPE_NETFILTER**.

    For programs attached to a particular cgroup, e.g.,
    **BPF_PROG_TYPE_CGROUP_SKB**, **BPF_PROG_TYPE_CGROUP_SOCK**,
    **BPF_PROG_TYPE_SOCK_OPS** and **BPF_PROG_TYPE_CGROUP_SOCK_ADDR**, users
    can use **bpftool cgroup** to dump cgroup attachments. For sk_{filter, skb,
    msg, reuseport} and lwt/seg6 bpf programs, users should consult other
    tools, e.g., iproute2.

    The current output will start with all xdp program attachments, followed by
    all tcx, netkit, then tc class/qdisc bpf program attachments, then
    flow_dissector and finally netfilter programs. Both xdp programs and
    tcx/netkit/tc programs are ordered based on ifindex number. If multiple bpf
    programs attached to the same networking device through **tc**, the order
    will be first all bpf programs attached to tcx, netkit, then tc classes,
    then all bpf programs attached to non clsact qdiscs, and finally all bpf
    programs attached to root and clsact qdisc.

bpftool net attach *ATTACH_TYPE* *PROG* dev *NAME* [ overwrite ]
    Attach bpf program *PROG* to network interface *NAME* with type specified
    by *ATTACH_TYPE*. Previously attached bpf program can be replaced by the
    command used with **overwrite** option. Currently, only XDP-related modes
    are supported for *ATTACH_TYPE*.

    *ATTACH_TYPE* can be of:
    **xdp** - try native XDP and fallback to generic XDP if NIC driver does not support it;
    **xdpgeneric** - Generic XDP. runs at generic XDP hook when packet already enters receive path as skb;
    **xdpdrv** - Native XDP. runs earliest point in driver's receive path;
    **xdpoffload** - Offload XDP. runs directly on NIC on each packet reception;

bpftool net detach *ATTACH_TYPE* dev *NAME*
    Detach bpf program attached to network interface *NAME* with type specified
    by *ATTACH_TYPE*. To detach bpf program, same *ATTACH_TYPE* previously used
    for attach must be specified. Currently, only XDP-related modes are
    supported for *ATTACH_TYPE*.

bpftool net help
    Print short help message.

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

EXAMPLES
========

| **# bpftool net**

::

      xdp:
      eth0(2) driver id 198

      tc:
      eth0(2) htb name prefix_matcher.o:[cls_prefix_matcher_htb] id 111727 act []
      eth0(2) clsact/ingress fbflow_icmp id 130246 act []
      eth0(2) clsact/egress prefix_matcher.o:[cls_prefix_matcher_clsact] id 111726
      eth0(2) clsact/egress cls_fg_dscp id 108619 act []
      eth0(2) clsact/egress fbflow_egress id 130245

|
| **# bpftool -jp net**

::

    [{
            "xdp": [{
                    "devname": "eth0",
                    "ifindex": 2,
                    "mode": "driver",
                    "id": 198
                }
            ],
            "tc": [{
                    "devname": "eth0",
                    "ifindex": 2,
                    "kind": "htb",
                    "name": "prefix_matcher.o:[cls_prefix_matcher_htb]",
                    "id": 111727,
                    "act": []
                },{
                    "devname": "eth0",
                    "ifindex": 2,
                    "kind": "clsact/ingress",
                    "name": "fbflow_icmp",
                    "id": 130246,
                    "act": []
                },{
                    "devname": "eth0",
                    "ifindex": 2,
                    "kind": "clsact/egress",
                    "name": "prefix_matcher.o:[cls_prefix_matcher_clsact]",
                    "id": 111726,
                },{
                    "devname": "eth0",
                    "ifindex": 2,
                    "kind": "clsact/egress",
                    "name": "cls_fg_dscp",
                    "id": 108619,
                    "act": []
                },{
                    "devname": "eth0",
                    "ifindex": 2,
                    "kind": "clsact/egress",
                    "name": "fbflow_egress",
                    "id": 130245,
                }
            ]
        }
    ]

|
| **# bpftool net attach xdpdrv id 16 dev enp6s0np0**
| **# bpftool net**

::

      xdp:
      enp6s0np0(4) driver id 16

|
| **# bpftool net attach xdpdrv id 16 dev enp6s0np0**
| **# bpftool net attach xdpdrv id 20 dev enp6s0np0 overwrite**
| **# bpftool net**

::

      xdp:
      enp6s0np0(4) driver id 20

|
| **# bpftool net attach xdpdrv id 16 dev enp6s0np0**
| **# bpftool net detach xdpdrv dev enp6s0np0**
| **# bpftool net**

::

      xdp: