xref: /aosp_15_r20/external/bpftool/docs/bpftool-net.rst (revision 858ea5e570667251cdc31d3fe7b846b591105938)

.. 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* }
|	*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: