Provided by: linux-oem-5.6-tools-common_5.6.0-1007.7_all bug

NAME

       bpftool-net - tool for inspection of netdev/tc related bpf prog attachments

SYNOPSIS

          bpftool [OPTIONS] net COMMAND

          OPTIONS := { [{ -j | --json }] [{ -p | --pretty }] }

          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 generic help message (similar to bpftool help).

          -V, --version
                 Print version number (similar to bpftool version).

          -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 from libbpf, including debug-level information.

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-prog(8), bpftool-map(8), bpftool-cgroup(8),
          bpftool-feature(8), bpftool-perf(8), bpftool-btf(8)

                                                                                   BPFTOOL-NET(8)