195 lines
6.1 KiB
ReStructuredText
Executable file
195 lines
6.1 KiB
ReStructuredText
Executable file
================
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bpftool-prog
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================
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-------------------------------------------------------------------------------
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tool for inspection and simple manipulation of eBPF progs
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-------------------------------------------------------------------------------
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:Manual section: 8
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SYNOPSIS
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========
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**bpftool** [*OPTIONS*] **prog** *COMMAND*
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*OPTIONS* := { { **-j** | **--json** } [{ **-p** | **--pretty** }] | { **-f** | **--bpffs** } }
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*COMMANDS* :=
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{ **show** | **list** | **dump xlated** | **dump jited** | **pin** | **load** | **help** }
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MAP COMMANDS
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=============
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| **bpftool** **prog { show | list }** [*PROG*]
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| **bpftool** **prog dump xlated** *PROG* [{**file** *FILE* | **opcodes** | **visual**}]
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| **bpftool** **prog dump jited** *PROG* [{**file** *FILE* | **opcodes**}]
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| **bpftool** **prog pin** *PROG* *FILE*
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| **bpftool** **prog load** *OBJ* *FILE* [**type** *TYPE*] [**map** {**idx** *IDX* | **name** *NAME*} *MAP*] [**dev** *NAME*]
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| **bpftool** **prog help**
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| *MAP* := { **id** *MAP_ID* | **pinned** *FILE* }
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| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* }
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| *TYPE* := {
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| **socket** | **kprobe** | **kretprobe** | **classifier** | **action** |
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| **tracepoint** | **raw_tracepoint** | **xdp** | **perf_event** | **cgroup/skb** |
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| **cgroup/sock** | **cgroup/dev** | **lwt_in** | **lwt_out** | **lwt_xmit** |
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| **lwt_seg6local** | **sockops** | **sk_skb** | **sk_msg** | **lirc_mode2** |
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| **cgroup/bind4** | **cgroup/bind6** | **cgroup/post_bind4** | **cgroup/post_bind6** |
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| **cgroup/connect4** | **cgroup/connect6** | **cgroup/sendmsg4** | **cgroup/sendmsg6**
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| }
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DESCRIPTION
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===========
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**bpftool prog { show | list }** [*PROG*]
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Show information about loaded programs. If *PROG* is
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specified show information only about given program, otherwise
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list all programs currently loaded on the system.
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Output will start with program ID followed by program type and
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zero or more named attributes (depending on kernel version).
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**bpftool prog dump xlated** *PROG* [{ **file** *FILE* | **opcodes** | **visual** }]
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Dump eBPF instructions of the program from the kernel. By
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default, eBPF will be disassembled and printed to standard
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output in human-readable format. In this case, **opcodes**
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controls if raw opcodes should be printed as well.
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If **file** is specified, the binary image will instead be
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written to *FILE*.
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If **visual** is specified, control flow graph (CFG) will be
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built instead, and eBPF instructions will be presented with
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CFG in DOT format, on standard output.
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**bpftool prog dump jited** *PROG* [{ **file** *FILE* | **opcodes** }]
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Dump jited image (host machine code) of the program.
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If *FILE* is specified image will be written to a file,
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otherwise it will be disassembled and printed to stdout.
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**opcodes** controls if raw opcodes will be printed.
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**bpftool prog pin** *PROG* *FILE*
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Pin program *PROG* as *FILE*.
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Note: *FILE* must be located in *bpffs* mount.
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**bpftool prog load** *OBJ* *FILE* [**type** *TYPE*] [**map** {**idx** *IDX* | **name** *NAME*} *MAP*] [**dev** *NAME*]
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Load bpf program from binary *OBJ* and pin as *FILE*.
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**type** is optional, if not specified program type will be
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inferred from section names.
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By default bpftool will create new maps as declared in the ELF
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object being loaded. **map** parameter allows for the reuse
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of existing maps. It can be specified multiple times, each
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time for a different map. *IDX* refers to index of the map
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to be replaced in the ELF file counting from 0, while *NAME*
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allows to replace a map by name. *MAP* specifies the map to
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use, referring to it by **id** or through a **pinned** file.
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If **dev** *NAME* is specified program will be loaded onto
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given networking device (offload).
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Note: *FILE* must be located in *bpffs* mount.
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**bpftool prog help**
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Print short help message.
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OPTIONS
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=======
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-h, --help
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Print short generic help message (similar to **bpftool help**).
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-v, --version
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Print version number (similar to **bpftool version**).
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-j, --json
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Generate JSON output. For commands that cannot produce JSON, this
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option has no effect.
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-p, --pretty
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Generate human-readable JSON output. Implies **-j**.
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-f, --bpffs
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Show file names of pinned programs.
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EXAMPLES
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========
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**# bpftool prog show**
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::
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10: xdp name some_prog tag 005a3d2123620c8b gpl
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loaded_at Sep 29/20:11 uid 0
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xlated 528B jited 370B memlock 4096B map_ids 10
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**# bpftool --json --pretty prog show**
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::
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{
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"programs": [{
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"id": 10,
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"type": "xdp",
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"tag": "005a3d2123620c8b",
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"gpl_compatible": true,
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"loaded_at": "Sep 29/20:11",
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"uid": 0,
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"bytes_xlated": 528,
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"jited": true,
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"bytes_jited": 370,
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"bytes_memlock": 4096,
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"map_ids": [10
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]
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}
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]
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}
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| **# bpftool prog dump xlated id 10 file /tmp/t**
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| **# ls -l /tmp/t**
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| -rw------- 1 root root 560 Jul 22 01:42 /tmp/t
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**# bpftool prog dum jited tag 005a3d2123620c8b**
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::
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push %rbp
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mov %rsp,%rbp
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sub $0x228,%rsp
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sub $0x28,%rbp
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mov %rbx,0x0(%rbp)
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| **# mount -t bpf none /sys/fs/bpf/**
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| **# bpftool prog pin id 10 /sys/fs/bpf/prog**
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| **# bpftool prog load ./my_prog.o /sys/fs/bpf/prog2**
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| **# ls -l /sys/fs/bpf/**
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| -rw------- 1 root root 0 Jul 22 01:43 prog
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| -rw------- 1 root root 0 Jul 22 01:44 prog2
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**# bpftool prog dum jited pinned /sys/fs/bpf/prog opcodes**
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::
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push %rbp
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55
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mov %rsp,%rbp
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48 89 e5
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sub $0x228,%rsp
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48 81 ec 28 02 00 00
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sub $0x28,%rbp
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48 83 ed 28
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mov %rbx,0x0(%rbp)
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48 89 5d 00
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| **# bpftool prog load xdp1_kern.o /sys/fs/bpf/xdp1 type xdp map name rxcnt id 7**
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| **# bpftool prog show pinned /sys/fs/bpf/xdp1**
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| 9: xdp name xdp_prog1 tag 539ec6ce11b52f98 gpl
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| loaded_at 2018-06-25T16:17:31-0700 uid 0
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| xlated 488B jited 336B memlock 4096B map_ids 7
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| **# rm /sys/fs/bpf/xdp1**
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SEE ALSO
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========
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**bpftool**\ (8), **bpftool-map**\ (8), **bpftool-cgroup**\ (8)
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