From: Krzesimir Nowak krzesimir@kinvolk.io
[ Upstream commit 1884c066579a7a274dd981a4d9639ca63db66a23 ]
In commit 9a5ab8bf1d6d ("tools: bpftool: turn err() and info() macros into functions") one case of error reporting was special cased, so it could report a lookup error for a specific key when dumping the map element. What the code forgot to do is to wrap the key and value keys into a JSON object, so an example output of pretty JSON dump of a sockhash map (which does not support looking up its values) is:
[ "key": ["0x0a","0x41","0x00","0x02","0x1f","0x78","0x00","0x00" ], "value": { "error": "Operation not supported" }, "key": ["0x0a","0x41","0x00","0x02","0x1f","0x78","0x00","0x01" ], "value": { "error": "Operation not supported" } ]
Note the key-value pairs inside the toplevel array. They should be wrapped inside a JSON object, otherwise it is an invalid JSON. This commit fixes this, so the output now is:
[{ "key": ["0x0a","0x41","0x00","0x02","0x1f","0x78","0x00","0x00" ], "value": { "error": "Operation not supported" } },{ "key": ["0x0a","0x41","0x00","0x02","0x1f","0x78","0x00","0x01" ], "value": { "error": "Operation not supported" } } ]
Fixes: 9a5ab8bf1d6d ("tools: bpftool: turn err() and info() macros into functions") Cc: Quentin Monnet quentin.monnet@netronome.com Signed-off-by: Krzesimir Nowak krzesimir@kinvolk.io Acked-by: Andrii Nakryiko andriin@fb.com Signed-off-by: Daniel Borkmann daniel@iogearbox.net Signed-off-by: Sasha Levin sashal@kernel.org --- tools/bpf/bpftool/map.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c index 994a7e0d16fb..14f581b562bd 100644 --- a/tools/bpf/bpftool/map.c +++ b/tools/bpf/bpftool/map.c @@ -713,12 +713,14 @@ static int dump_map_elem(int fd, void *key, void *value, return 0;
if (json_output) { + jsonw_start_object(json_wtr); jsonw_name(json_wtr, "key"); print_hex_data_json(key, map_info->key_size); jsonw_name(json_wtr, "value"); jsonw_start_object(json_wtr); jsonw_string_field(json_wtr, "error", strerror(lookup_errno)); jsonw_end_object(json_wtr); + jsonw_end_object(json_wtr); } else { if (errno == ENOENT) print_entry_plain(map_info, key, NULL);