1================ 2bpftool-map 3================ 4------------------------------------------------------------------------------- 5tool for inspection and simple manipulation of eBPF maps 6------------------------------------------------------------------------------- 7 8:Manual section: 8 9 10SYNOPSIS 11======== 12 13 **bpftool** [*OPTIONS*] **map** *COMMAND* 14 15 *OPTIONS* := { { **-j** | **--json** } [{ **-p** | **--pretty** }] } 16 17 *COMMANDS* := 18 { **show** | **dump** | **update** | **lookup** | **getnext** | **delete** 19 | **pin** | **help** } 20 21MAP COMMANDS 22============= 23 24| **bpftool** **map show** [*MAP*] 25| **bpftool** **map dump** *MAP* 26| **bpftool** **map update** *MAP* **key** *BYTES* **value** *VALUE* [*UPDATE_FLAGS*] 27| **bpftool** **map lookup** *MAP* **key** *BYTES* 28| **bpftool** **map getnext** *MAP* [**key** *BYTES*] 29| **bpftool** **map delete** *MAP* **key** *BYTES* 30| **bpftool** **map pin** *MAP* *FILE* 31| **bpftool** **map help** 32| 33| *MAP* := { **id** *MAP_ID* | **pinned** *FILE* } 34| *VALUE* := { *BYTES* | *MAP* | *PROGRAM* } 35| *UPDATE_FLAGS* := { **any** | **exist** | **noexist** } 36 37DESCRIPTION 38=========== 39 **bpftool map show** [*MAP*] 40 Show information about loaded maps. If *MAP* is specified 41 show information only about given map, otherwise list all 42 maps currently loaded on the system. 43 44 Output will start with map ID followed by map type and 45 zero or more named attributes (depending on kernel version). 46 47 **bpftool map dump** *MAP* 48 Dump all entries in a given *MAP*. 49 50 **bpftool map update** *MAP* **key** *BYTES* **value** *VALUE* [*UPDATE_FLAGS*] 51 Update map entry for a given *KEY*. 52 53 *UPDATE_FLAGS* can be one of: **any** update existing entry 54 or add if doesn't exit; **exist** update only if entry already 55 exists; **noexist** update only if entry doesn't exist. 56 57 **bpftool map lookup** *MAP* **key** *BYTES* 58 Lookup **key** in the map. 59 60 **bpftool map getnext** *MAP* [**key** *BYTES*] 61 Get next key. If *key* is not specified, get first key. 62 63 **bpftool map delete** *MAP* **key** *BYTES* 64 Remove entry from the map. 65 66 **bpftool map pin** *MAP* *FILE* 67 Pin map *MAP* as *FILE*. 68 69 Note: *FILE* must be located in *bpffs* mount. 70 71 **bpftool map help** 72 Print short help message. 73 74OPTIONS 75======= 76 -h, --help 77 Print short generic help message (similar to **bpftool help**). 78 79 -v, --version 80 Print version number (similar to **bpftool version**). 81 82 -j, --json 83 Generate JSON output. For commands that cannot produce JSON, this 84 option has no effect. 85 86 -p, --pretty 87 Generate human-readable JSON output. Implies **-j**. 88 89EXAMPLES 90======== 91**# bpftool map show** 92:: 93 94 10: hash name some_map flags 0x0 95 key 4B value 8B max_entries 2048 memlock 167936B 96 97**# bpftool map update id 10 key 13 00 07 00 value 02 00 00 00 01 02 03 04** 98 99**# bpftool map lookup id 10 key 0 1 2 3** 100 101:: 102 103 key: 00 01 02 03 value: 00 01 02 03 04 05 06 07 104 105 106**# bpftool map dump id 10** 107:: 108 109 key: 00 01 02 03 value: 00 01 02 03 04 05 06 07 110 key: 0d 00 07 00 value: 02 00 00 00 01 02 03 04 111 Found 2 elements 112 113**# bpftool map getnext id 10 key 0 1 2 3** 114:: 115 116 key: 117 00 01 02 03 118 next key: 119 0d 00 07 00 120 121| 122| **# mount -t bpf none /sys/fs/bpf/** 123| **# bpftool map pin id 10 /sys/fs/bpf/map** 124| **# bpftool map del pinned /sys/fs/bpf/map key 13 00 07 00** 125 126SEE ALSO 127======== 128 **bpftool**\ (8), **bpftool-prog**\ (8) 129