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1================
2bpftool-net
3================
4-------------------------------------------------------------------------------
5tool for inspection of netdev/tc related bpf prog attachments
6-------------------------------------------------------------------------------
7
8:Manual section: 8
9
10SYNOPSIS
11========
12
13 **bpftool** [*OPTIONS*] **net** *COMMAND*
14
15 *OPTIONS* := { [{ **-j** | **--json** }] [{ **-p** | **--pretty** }] }
16
17 *COMMANDS* :=
18 { **show** | **list** | **attach** | **detach** | **help** }
19
20NET COMMANDS
21============
22
23| **bpftool** **net { show | list }** [ **dev** *NAME* ]
24| **bpftool** **net attach** *ATTACH_TYPE* *PROG* **dev** *NAME* [ **overwrite** ]
25| **bpftool** **net detach** *ATTACH_TYPE* **dev** *NAME*
26| **bpftool** **net help**
27|
28| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* }
29| *ATTACH_TYPE* := { **xdp** | **xdpgeneric** | **xdpdrv** | **xdpoffload** }
30
31DESCRIPTION
32===========
33 **bpftool net { show | list }** [ **dev** *NAME* ]
34 List bpf program attachments in the kernel networking subsystem.
35
36 Currently, only device driver xdp attachments and tc filter
37 classification/action attachments are implemented, i.e., for
38 program types **BPF_PROG_TYPE_SCHED_CLS**,
39 **BPF_PROG_TYPE_SCHED_ACT** and **BPF_PROG_TYPE_XDP**.
40 For programs attached to a particular cgroup, e.g.,
41 **BPF_PROG_TYPE_CGROUP_SKB**, **BPF_PROG_TYPE_CGROUP_SOCK**,
42 **BPF_PROG_TYPE_SOCK_OPS** and **BPF_PROG_TYPE_CGROUP_SOCK_ADDR**,
43 users can use **bpftool cgroup** to dump cgroup attachments.
44 For sk_{filter, skb, msg, reuseport} and lwt/seg6
45 bpf programs, users should consult other tools, e.g., iproute2.
46
47 The current output will start with all xdp program attachments, followed by
48 all tc class/qdisc bpf program attachments. Both xdp programs and
49 tc programs are ordered based on ifindex number. If multiple bpf
50 programs attached to the same networking device through **tc filter**,
51 the order will be first all bpf programs attached to tc classes, then
52 all bpf programs attached to non clsact qdiscs, and finally all
53 bpf programs attached to root and clsact qdisc.
54
55 **bpftool** **net attach** *ATTACH_TYPE* *PROG* **dev** *NAME* [ **overwrite** ]
56 Attach bpf program *PROG* to network interface *NAME* with
57 type specified by *ATTACH_TYPE*. Previously attached bpf program
58 can be replaced by the command used with **overwrite** option.
59 Currently, only XDP-related modes are supported for *ATTACH_TYPE*.
60
61 *ATTACH_TYPE* can be of:
62 **xdp** - try native XDP and fallback to generic XDP if NIC driver does not support it;
63 **xdpgeneric** - Generic XDP. runs at generic XDP hook when packet already enters receive path as skb;
64 **xdpdrv** - Native XDP. runs earliest point in driver's receive path;
65 **xdpoffload** - Offload XDP. runs directly on NIC on each packet reception;
66
67 **bpftool** **net detach** *ATTACH_TYPE* **dev** *NAME*
68 Detach bpf program attached to network interface *NAME* with
69 type specified by *ATTACH_TYPE*. To detach bpf program, same
70 *ATTACH_TYPE* previously used for attach must be specified.
71 Currently, only XDP-related modes are supported for *ATTACH_TYPE*.
72
73 **bpftool net help**
74 Print short help message.
75
76OPTIONS
77=======
78 -h, --help
79 Print short generic help message (similar to **bpftool help**).
80
81 -V, --version
82 Print version number (similar to **bpftool version**).
83
84 -j, --json
85 Generate JSON output. For commands that cannot produce JSON, this
86 option has no effect.
87
88 -p, --pretty
89 Generate human-readable JSON output. Implies **-j**.
90
91 -d, --debug
92 Print all logs available from libbpf, including debug-level
93 information.
94
95EXAMPLES
96========
97
98| **# bpftool net**
99
100::
101
102 xdp:
103 eth0(2) driver id 198
104
105 tc:
106 eth0(2) htb name prefix_matcher.o:[cls_prefix_matcher_htb] id 111727 act []
107 eth0(2) clsact/ingress fbflow_icmp id 130246 act []
108 eth0(2) clsact/egress prefix_matcher.o:[cls_prefix_matcher_clsact] id 111726
109 eth0(2) clsact/egress cls_fg_dscp id 108619 act []
110 eth0(2) clsact/egress fbflow_egress id 130245
111
112|
113| **# bpftool -jp net**
114
115::
116
117 [{
118 "xdp": [{
119 "devname": "eth0",
120 "ifindex": 2,
121 "mode": "driver",
122 "id": 198
123 }
124 ],
125 "tc": [{
126 "devname": "eth0",
127 "ifindex": 2,
128 "kind": "htb",
129 "name": "prefix_matcher.o:[cls_prefix_matcher_htb]",
130 "id": 111727,
131 "act": []
132 },{
133 "devname": "eth0",
134 "ifindex": 2,
135 "kind": "clsact/ingress",
136 "name": "fbflow_icmp",
137 "id": 130246,
138 "act": []
139 },{
140 "devname": "eth0",
141 "ifindex": 2,
142 "kind": "clsact/egress",
143 "name": "prefix_matcher.o:[cls_prefix_matcher_clsact]",
144 "id": 111726,
145 },{
146 "devname": "eth0",
147 "ifindex": 2,
148 "kind": "clsact/egress",
149 "name": "cls_fg_dscp",
150 "id": 108619,
151 "act": []
152 },{
153 "devname": "eth0",
154 "ifindex": 2,
155 "kind": "clsact/egress",
156 "name": "fbflow_egress",
157 "id": 130245,
158 }
159 ]
160 }
161 ]
162
163|
164| **# bpftool net attach xdpdrv id 16 dev enp6s0np0**
165| **# bpftool net**
166
167::
168
169 xdp:
170 enp6s0np0(4) driver id 16
171
172|
173| **# bpftool net attach xdpdrv id 16 dev enp6s0np0**
174| **# bpftool net attach xdpdrv id 20 dev enp6s0np0 overwrite**
175| **# bpftool net**
176
177::
178
179 xdp:
180 enp6s0np0(4) driver id 20
181
182|
183| **# bpftool net attach xdpdrv id 16 dev enp6s0np0**
184| **# bpftool net detach xdpdrv dev enp6s0np0**
185| **# bpftool net**
186
187::
188
189 xdp:
190
191
192SEE ALSO
193========
194 **bpf**\ (2),
195 **bpf-helpers**\ (7),
196 **bpftool**\ (8),
197 **bpftool-prog**\ (8),
198 **bpftool-map**\ (8),
199 **bpftool-cgroup**\ (8),
200 **bpftool-feature**\ (8),
201 **bpftool-perf**\ (8),
202 **bpftool-btf**\ (8)