Provided by: linux-tools-common_5.19.0-21.21_all 
NAME
bpftool-net - tool for inspection of netdev/tc related bpf prog attachments
SYNOPSIS
bpftool [OPTIONS] net COMMAND
OPTIONS := { { -j | --json } [{ -p | --pretty }] | { -d | --debug } | { -l | --legacy }
}
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, only device driver xdp attachments and tc filter
classification/action attachments are implemented, i.e., for program types
BPF_PROG_TYPE_SCHED_CLS, BPF_PROG_TYPE_SCHED_ACT and BPF_PROG_TYPE_XDP. 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
tc class/qdisc bpf program attachments. Both xdp programs and tc programs are
ordered based on ifindex number. If multiple bpf programs attached to the same
networking device through tc filter, the order will be first all bpf programs
attached to 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
-h, --help
Print short help message (similar to bpftool help).
-V, --version
Print bpftool's version number (similar to bpftool version), the number of the
libbpf version in use, and optional features that were included when bpftool was
compiled. Optional features include linking against libbfd to provide the
disassembler for JIT-ted programs (bpftool prog dump jited) and usage of BPF
skeletons (some features like bpftool prog profile or showing pids associated to
BPF objects may rely on it).
-j, --json
Generate JSON output. For commands that cannot produce JSON, this option has no
effect.
-p, --pretty
Generate human-readable JSON output. Implies -j.
-d, --debug
Print all logs available, even debug-level information. This includes logs from
libbpf as well as from the verifier, when attempting to load programs.
-l, --legacy
Use legacy libbpf mode which has more relaxed BPF program requirements. By
default, bpftool has more strict requirements about section names, changes
pinning logic and doesn't support some of the older non-BTF map declarations.
See https://github.com/libbpf/libbpf/wiki/Libbpf:-the-road-to-v1.0 for details.
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:
SEE ALSO
bpf(2), bpf-helpers(7), bpftool(8), bpftool-btf(8), bpftool-cgroup(8),
bpftool-feature(8), bpftool-gen(8), bpftool-iter(8), bpftool-link(8), bpftool-map(8),
bpftool-perf(8), bpftool-prog(8), bpftool-struct_ops(8)
BPFTOOL-NET(8)