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f05e2c32f7
Add a new printing function to dump translated eBPF instructions as
JSON. As for plain output, opcodes are printed only on request (when
`opcodes` is provided on the command line).
The disassembled output is generated by the same code that is used by
the kernel verifier.
Example output:
$ bpftool --json --pretty prog dump xlated id 1
[{
"disasm": "(bf) r6 = r1"
},{
"disasm": "(61) r7 = *(u32 *)(r6 +16)"
},{
"disasm": "(95) exit"
}
]
$ bpftool --json --pretty prog dump xlated id 1 opcodes
[{
"disasm": "(bf) r6 = r1",
"opcodes": {
"code": "0xbf",
"src_reg": "0x1",
"dst_reg": "0x6",
"off": ["0x00","0x00"
],
"imm": ["0x00","0x00","0x00","0x00"
]
}
},{
"disasm": "(61) r7 = *(u32 *)(r6 +16)",
"opcodes": {
"code": "0x61",
"src_reg": "0x6",
"dst_reg": "0x7",
"off": ["0x10","0x00"
],
"imm": ["0x00","0x00","0x00","0x00"
]
}
},{
"disasm": "(95) exit",
"opcodes": {
"code": "0x95",
"src_reg": "0x0",
"dst_reg": "0x0",
"off": ["0x00","0x00"
],
"imm": ["0x00","0x00","0x00","0x00"
]
}
}
]
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
/*
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* Simple streaming JSON writer
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*
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* This takes care of the annoying bits of JSON syntax like the commas
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* after elements
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Stephen Hemminger <stephen@networkplumber.org>
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*/
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#ifndef _JSON_WRITER_H_
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#define _JSON_WRITER_H_
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdarg.h>
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/* Opaque class structure */
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typedef struct json_writer json_writer_t;
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/* Create a new JSON stream */
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json_writer_t *jsonw_new(FILE *f);
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/* End output to JSON stream */
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void jsonw_destroy(json_writer_t **self_p);
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/* Cause output to have pretty whitespace */
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void jsonw_pretty(json_writer_t *self, bool on);
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/* Add property name */
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void jsonw_name(json_writer_t *self, const char *name);
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/* Add value */
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void jsonw_vprintf_enquote(json_writer_t *self, const char *fmt, va_list ap);
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void jsonw_printf(json_writer_t *self, const char *fmt, ...);
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void jsonw_string(json_writer_t *self, const char *value);
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void jsonw_bool(json_writer_t *self, bool value);
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void jsonw_float(json_writer_t *self, double number);
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void jsonw_float_fmt(json_writer_t *self, const char *fmt, double num);
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void jsonw_uint(json_writer_t *self, uint64_t number);
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void jsonw_hu(json_writer_t *self, unsigned short number);
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void jsonw_int(json_writer_t *self, int64_t number);
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void jsonw_null(json_writer_t *self);
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void jsonw_lluint(json_writer_t *self, unsigned long long int num);
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/* Useful Combinations of name and value */
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void jsonw_string_field(json_writer_t *self, const char *prop, const char *val);
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void jsonw_bool_field(json_writer_t *self, const char *prop, bool value);
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void jsonw_float_field(json_writer_t *self, const char *prop, double num);
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void jsonw_uint_field(json_writer_t *self, const char *prop, uint64_t num);
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void jsonw_hu_field(json_writer_t *self, const char *prop, unsigned short num);
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void jsonw_int_field(json_writer_t *self, const char *prop, int64_t num);
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void jsonw_null_field(json_writer_t *self, const char *prop);
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void jsonw_lluint_field(json_writer_t *self, const char *prop,
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unsigned long long int num);
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void jsonw_float_field_fmt(json_writer_t *self, const char *prop,
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const char *fmt, double val);
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/* Collections */
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void jsonw_start_object(json_writer_t *self);
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void jsonw_end_object(json_writer_t *self);
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void jsonw_start_array(json_writer_t *self);
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void jsonw_end_array(json_writer_t *self);
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/* Override default exception handling */
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typedef void (jsonw_err_handler_fn)(const char *);
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#endif /* _JSON_WRITER_H_ */
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