filter: bpf_asm: add minimal bpf asm tool

[firefly-linux-kernel-4.4.55.git] / tools / net / bpf_asm.c

diff --git a/tools/net/bpf_asm.c b/tools/net/bpf_asm.c
new file mode 100644 (file)
index 0000000..c15aef0
--- /dev/null
+++ b/tools/net/bpf_asm.c
@@ -0,0 +1,52 @@
+/*
+ * Minimal BPF assembler
+ *
+ * Instead of libpcap high-level filter expressions, it can be quite
+ * useful to define filters in low-level BPF assembler (that is kept
+ * close to Steven McCanne and Van Jacobson's original BPF paper).
+ * In particular for BPF JIT implementors, JIT security auditors, or
+ * just for defining BPF expressions that contain extensions which are
+ * not supported by compilers.
+ *
+ * How to get into it:
+ *
+ * 1) read Documentation/networking/filter.txt
+ * 2) Run `bpf_asm [-c] <filter-prog file>` to translate into binary
+ *    blob that is loadable with xt_bpf, cls_bpf et al. Note: -c will
+ *    pretty print a C-like construct.
+ *
+ * Copyright 2013 Daniel Borkmann <borkmann@redhat.com>
+ * Licensed under the GNU General Public License, version 2.0 (GPLv2)
+ */
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+extern void bpf_asm_compile(FILE *fp, bool cstyle);
+
+int main(int argc, char **argv)
+{
+       FILE *fp = stdin;
+       bool cstyle = false;
+       int i;
+
+       for (i = 1; i < argc; i++) {
+               if (!strncmp("-c", argv[i], 2)) {
+                       cstyle = true;
+                       continue;
+               }
+
+               fp = fopen(argv[i], "r");
+               if (!fp) {
+                       fp = stdin;
+                       continue;
+               }
+
+               break;
+       }
+
+       bpf_asm_compile(fp, cstyle);
+
+       return 0;
+}