tools: bpf: add bpftool
Add a simple tool for querying and updating BPF objects on the system.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c
new file mode 100644
index 0000000..e02d00d
--- /dev/null
+++ b/tools/bpf/bpftool/main.c
@@ -0,0 +1,212 @@
+/*
+ * Copyright (C) 2017 Netronome Systems, Inc.
+ *
+ * This software is dual licensed under the GNU General License Version 2,
+ * June 1991 as shown in the file COPYING in the top-level directory of this
+ * source tree or the BSD 2-Clause License provided below. You have the
+ * option to license this software under the complete terms of either license.
+ *
+ * The BSD 2-Clause License:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/* Author: Jakub Kicinski <kubakici@wp.pl> */
+
+#include <bfd.h>
+#include <ctype.h>
+#include <errno.h>
+#include <linux/bpf.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <bpf.h>
+
+#include "main.h"
+
+const char *bin_name;
+static int last_argc;
+static char **last_argv;
+static int (*last_do_help)(int argc, char **argv);
+
+void usage(void)
+{
+ last_do_help(last_argc - 1, last_argv + 1);
+
+ exit(-1);
+}
+
+static int do_help(int argc, char **argv)
+{
+ fprintf(stderr,
+ "Usage: %s OBJECT { COMMAND | help }\n"
+ " %s batch file FILE\n"
+ "\n"
+ " OBJECT := { prog | map }\n",
+ bin_name, bin_name);
+
+ return 0;
+}
+
+int cmd_select(const struct cmd *cmds, int argc, char **argv,
+ int (*help)(int argc, char **argv))
+{
+ unsigned int i;
+
+ last_argc = argc;
+ last_argv = argv;
+ last_do_help = help;
+
+ if (argc < 1 && cmds[0].func)
+ return cmds[0].func(argc, argv);
+
+ for (i = 0; cmds[i].func; i++)
+ if (is_prefix(*argv, cmds[i].cmd))
+ return cmds[i].func(argc - 1, argv + 1);
+
+ help(argc - 1, argv + 1);
+
+ return -1;
+}
+
+bool is_prefix(const char *pfx, const char *str)
+{
+ if (!pfx)
+ return false;
+ if (strlen(str) < strlen(pfx))
+ return false;
+
+ return !memcmp(str, pfx, strlen(pfx));
+}
+
+void print_hex(void *arg, unsigned int n, const char *sep)
+{
+ unsigned char *data = arg;
+ unsigned int i;
+
+ for (i = 0; i < n; i++) {
+ const char *pfx = "";
+
+ if (!i)
+ /* nothing */;
+ else if (!(i % 16))
+ printf("\n");
+ else if (!(i % 8))
+ printf(" ");
+ else
+ pfx = sep;
+
+ printf("%s%02hhx", i ? pfx : "", data[i]);
+ }
+}
+
+static int do_batch(int argc, char **argv);
+
+static const struct cmd cmds[] = {
+ { "help", do_help },
+ { "batch", do_batch },
+ { "prog", do_prog },
+ { "map", do_map },
+ { 0 }
+};
+
+static int do_batch(int argc, char **argv)
+{
+ unsigned int lines = 0;
+ char *n_argv[4096];
+ char buf[65536];
+ int n_argc;
+ FILE *fp;
+ int err;
+
+ if (argc < 2) {
+ err("too few parameters for batch\n");
+ return -1;
+ } else if (!is_prefix(*argv, "file")) {
+ err("expected 'file', got: %s\n", *argv);
+ return -1;
+ } else if (argc > 2) {
+ err("too many parameters for batch\n");
+ return -1;
+ }
+ NEXT_ARG();
+
+ fp = fopen(*argv, "r");
+ if (!fp) {
+ err("Can't open file (%s): %s\n", *argv, strerror(errno));
+ return -1;
+ }
+
+ while (fgets(buf, sizeof(buf), fp)) {
+ if (strlen(buf) == sizeof(buf) - 1) {
+ errno = E2BIG;
+ break;
+ }
+
+ n_argc = 0;
+ n_argv[n_argc] = strtok(buf, " \t\n");
+
+ while (n_argv[n_argc]) {
+ n_argc++;
+ if (n_argc == ARRAY_SIZE(n_argv)) {
+ err("line %d has too many arguments, skip\n",
+ lines);
+ n_argc = 0;
+ break;
+ }
+ n_argv[n_argc] = strtok(NULL, " \t\n");
+ }
+
+ if (!n_argc)
+ continue;
+
+ err = cmd_select(cmds, n_argc, n_argv, do_help);
+ if (err)
+ goto err_close;
+
+ lines++;
+ }
+
+ if (errno && errno != ENOENT) {
+ perror("reading batch file failed");
+ err = -1;
+ } else {
+ info("processed %d lines\n", lines);
+ err = 0;
+ }
+err_close:
+ fclose(fp);
+
+ return err;
+}
+
+int main(int argc, char **argv)
+{
+ bin_name = argv[0];
+ NEXT_ARG();
+
+ bfd_init();
+
+ return cmd_select(cmds, argc, argv, do_help);
+}