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Linux/tools/net/bpf_asm.c

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  1 /*
  2  * Minimal BPF assembler
  3  *
  4  * Instead of libpcap high-level filter expressions, it can be quite
  5  * useful to define filters in low-level BPF assembler (that is kept
  6  * close to Steven McCanne and Van Jacobson's original BPF paper).
  7  * In particular for BPF JIT implementors, JIT security auditors, or
  8  * just for defining BPF expressions that contain extensions which are
  9  * not supported by compilers.
 10  *
 11  * How to get into it:
 12  *
 13  * 1) read Documentation/networking/filter.txt
 14  * 2) Run `bpf_asm [-c] <filter-prog file>` to translate into binary
 15  *    blob that is loadable with xt_bpf, cls_bpf et al. Note: -c will
 16  *    pretty print a C-like construct.
 17  *
 18  * Copyright 2013 Daniel Borkmann <borkmann@redhat.com>
 19  * Licensed under the GNU General Public License, version 2.0 (GPLv2)
 20  */
 21 
 22 #include <stdbool.h>
 23 #include <stdio.h>
 24 #include <string.h>
 25 
 26 extern void bpf_asm_compile(FILE *fp, bool cstyle);
 27 
 28 int main(int argc, char **argv)
 29 {
 30         FILE *fp = stdin;
 31         bool cstyle = false;
 32         int i;
 33 
 34         for (i = 1; i < argc; i++) {
 35                 if (!strncmp("-c", argv[i], 2)) {
 36                         cstyle = true;
 37                         continue;
 38                 }
 39 
 40                 fp = fopen(argv[i], "r");
 41                 if (!fp) {
 42                         fp = stdin;
 43                         continue;
 44                 }
 45 
 46                 break;
 47         }
 48 
 49         bpf_asm_compile(fp, cstyle);
 50 
 51         return 0;
 52 }
 53 

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