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bpftool-net.rst (4633B)


      1 ================
      2 bpftool-net
      3 ================
      4 -------------------------------------------------------------------------------
      5 tool for inspection of netdev/tc related bpf prog attachments
      6 -------------------------------------------------------------------------------
      7 
      8 :Manual section: 8
      9 
     10 SYNOPSIS
     11 ========
     12 
     13 	**bpftool** [*OPTIONS*] **net** *COMMAND*
     14 
     15 	*OPTIONS* := { [{ **-j** | **--json** }] [{ **-p** | **--pretty** }] }
     16 
     17 	*COMMANDS* :=
     18 	{ **show** | **list** } [ **dev** name ] | **help**
     19 
     20 NET COMMANDS
     21 ============
     22 
     23 |	**bpftool** **net { show | list } [ dev name ]**
     24 |	**bpftool** **net help**
     25 
     26 DESCRIPTION
     27 ===========
     28 	**bpftool net { show | list } [ dev name ]**
     29                   List bpf program attachments in the kernel networking subsystem.
     30 
     31                   Currently, only device driver xdp attachments and tc filter
     32                   classification/action attachments are implemented, i.e., for
     33                   program types **BPF_PROG_TYPE_SCHED_CLS**,
     34                   **BPF_PROG_TYPE_SCHED_ACT** and **BPF_PROG_TYPE_XDP**.
     35                   For programs attached to a particular cgroup, e.g.,
     36                   **BPF_PROG_TYPE_CGROUP_SKB**, **BPF_PROG_TYPE_CGROUP_SOCK**,
     37                   **BPF_PROG_TYPE_SOCK_OPS** and **BPF_PROG_TYPE_CGROUP_SOCK_ADDR**,
     38                   users can use **bpftool cgroup** to dump cgroup attachments.
     39                   For sk_{filter, skb, msg, reuseport} and lwt/seg6
     40                   bpf programs, users should consult other tools, e.g., iproute2.
     41 
     42                   The current output will start with all xdp program attachments, followed by
     43                   all tc class/qdisc bpf program attachments. Both xdp programs and
     44                   tc programs are ordered based on ifindex number. If multiple bpf
     45                   programs attached to the same networking device through **tc filter**,
     46                   the order will be first all bpf programs attached to tc classes, then
     47                   all bpf programs attached to non clsact qdiscs, and finally all
     48                   bpf programs attached to root and clsact qdisc.
     49 
     50 	**bpftool net help**
     51 		  Print short help message.
     52 
     53 OPTIONS
     54 =======
     55 	-h, --help
     56 		  Print short generic help message (similar to **bpftool help**).
     57 
     58 	-v, --version
     59 		  Print version number (similar to **bpftool version**).
     60 
     61 	-j, --json
     62 		  Generate JSON output. For commands that cannot produce JSON, this
     63 		  option has no effect.
     64 
     65 	-p, --pretty
     66 		  Generate human-readable JSON output. Implies **-j**.
     67 
     68 EXAMPLES
     69 ========
     70 
     71 | **# bpftool net**
     72 
     73 ::
     74 
     75       xdp:
     76       eth0(2) driver id 198
     77 
     78       tc:
     79       eth0(2) htb name prefix_matcher.o:[cls_prefix_matcher_htb] id 111727 act []
     80       eth0(2) clsact/ingress fbflow_icmp id 130246 act []
     81       eth0(2) clsact/egress prefix_matcher.o:[cls_prefix_matcher_clsact] id 111726
     82       eth0(2) clsact/egress cls_fg_dscp id 108619 act []
     83       eth0(2) clsact/egress fbflow_egress id 130245
     84 
     85 |
     86 | **# bpftool -jp net**
     87 
     88 ::
     89 
     90     [{
     91             "xdp": [{
     92                     "devname": "eth0",
     93                     "ifindex": 2,
     94                     "mode": "driver",
     95                     "id": 198
     96                 }
     97             ],
     98             "tc": [{
     99                     "devname": "eth0",
    100                     "ifindex": 2,
    101                     "kind": "htb",
    102                     "name": "prefix_matcher.o:[cls_prefix_matcher_htb]",
    103                     "id": 111727,
    104                     "act": []
    105                 },{
    106                     "devname": "eth0",
    107                     "ifindex": 2,
    108                     "kind": "clsact/ingress",
    109                     "name": "fbflow_icmp",
    110                     "id": 130246,
    111                     "act": []
    112                 },{
    113                     "devname": "eth0",
    114                     "ifindex": 2,
    115                     "kind": "clsact/egress",
    116                     "name": "prefix_matcher.o:[cls_prefix_matcher_clsact]",
    117                     "id": 111726,
    118                 },{
    119                     "devname": "eth0",
    120                     "ifindex": 2,
    121                     "kind": "clsact/egress",
    122                     "name": "cls_fg_dscp",
    123                     "id": 108619,
    124                     "act": []
    125                 },{
    126                     "devname": "eth0",
    127                     "ifindex": 2,
    128                     "kind": "clsact/egress",
    129                     "name": "fbflow_egress",
    130                     "id": 130245,
    131                 }
    132             ]
    133         }
    134     ]
    135 
    136 
    137 SEE ALSO
    138 ========
    139 	**bpf**\ (2),
    140 	**bpf-helpers**\ (7),
    141 	**bpftool**\ (8),
    142 	**bpftool-prog**\ (8),
    143 	**bpftool-map**\ (8),
    144 	**bpftool-cgroup**\ (8),
    145 	**bpftool-feature**\ (8),
    146 	**bpftool-perf**\ (8)