zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/app/iptables/extensions/libipt_TTL.c b/ap/app/iptables/extensions/libipt_TTL.c
new file mode 100755
index 0000000..0e2be0b
--- /dev/null
+++ b/ap/app/iptables/extensions/libipt_TTL.c
@@ -0,0 +1,157 @@
+/* Shared library add-on to iptables for the TTL target
+ * (C) 2000 by Harald Welte <laforge@gnumonks.org>
+ *
+ * $Id$
+ *
+ * This program is distributed under the terms of GNU GPL
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <xtables.h>
+
+#include <linux/netfilter_ipv4/ipt_TTL.h>
+
+#define IPT_TTL_USED 1
+
+static void TTL_help(void)
+{
+ printf(
+"TTL target options\n"
+" --ttl-set value Set TTL to <value 0-255>\n"
+" --ttl-dec value Decrement TTL by <value 1-255>\n"
+" --ttl-inc value Increment TTL by <value 1-255>\n");
+}
+
+static int TTL_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_entry_target **target)
+{
+ struct ipt_TTL_info *info = (struct ipt_TTL_info *) (*target)->data;
+ unsigned int value;
+
+ if (*flags & IPT_TTL_USED) {
+ xtables_error(PARAMETER_PROBLEM,
+ "Can't specify TTL option twice");
+ }
+
+ if (!optarg)
+ xtables_error(PARAMETER_PROBLEM,
+ "TTL: You must specify a value");
+
+ if (xtables_check_inverse(optarg, &invert, NULL, 0))
+ xtables_error(PARAMETER_PROBLEM,
+ "TTL: unexpected `!'");
+
+ if (!xtables_strtoui(optarg, NULL, &value, 0, UINT8_MAX))
+ xtables_error(PARAMETER_PROBLEM,
+ "TTL: Expected value between 0 and 255");
+
+ switch (c) {
+
+ case '1':
+ info->mode = IPT_TTL_SET;
+ break;
+
+ case '2':
+ if (value == 0) {
+ xtables_error(PARAMETER_PROBLEM,
+ "TTL: decreasing by 0?");
+ }
+
+ info->mode = IPT_TTL_DEC;
+ break;
+
+ case '3':
+ if (value == 0) {
+ xtables_error(PARAMETER_PROBLEM,
+ "TTL: increasing by 0?");
+ }
+
+ info->mode = IPT_TTL_INC;
+ break;
+
+ default:
+ return 0;
+
+ }
+
+ info->ttl = value;
+ *flags |= IPT_TTL_USED;
+
+ return 1;
+}
+
+static void TTL_check(unsigned int flags)
+{
+ if (!(flags & IPT_TTL_USED))
+ xtables_error(PARAMETER_PROBLEM,
+ "TTL: You must specify an action");
+}
+
+static void TTL_save(const void *ip, const struct xt_entry_target *target)
+{
+ const struct ipt_TTL_info *info =
+ (struct ipt_TTL_info *) target->data;
+
+ switch (info->mode) {
+ case IPT_TTL_SET:
+ printf("--ttl-set ");
+ break;
+ case IPT_TTL_DEC:
+ printf("--ttl-dec ");
+ break;
+
+ case IPT_TTL_INC:
+ printf("--ttl-inc ");
+ break;
+ }
+ printf("%u ", info->ttl);
+}
+
+static void TTL_print(const void *ip, const struct xt_entry_target *target,
+ int numeric)
+{
+ const struct ipt_TTL_info *info =
+ (struct ipt_TTL_info *) target->data;
+
+ printf("TTL ");
+ switch (info->mode) {
+ case IPT_TTL_SET:
+ printf("set to ");
+ break;
+ case IPT_TTL_DEC:
+ printf("decrement by ");
+ break;
+ case IPT_TTL_INC:
+ printf("increment by ");
+ break;
+ }
+ printf("%u ", info->ttl);
+}
+
+static const struct option TTL_opts[] = {
+ { "ttl-set", 1, NULL, '1' },
+ { "ttl-dec", 1, NULL, '2' },
+ { "ttl-inc", 1, NULL, '3' },
+ { .name = NULL }
+};
+
+static struct xtables_target ttl_tg_reg = {
+ .name = "TTL",
+ .version = XTABLES_VERSION,
+ .family = NFPROTO_IPV4,
+ .size = XT_ALIGN(sizeof(struct ipt_TTL_info)),
+ .userspacesize = XT_ALIGN(sizeof(struct ipt_TTL_info)),
+ .help = TTL_help,
+ .parse = TTL_parse,
+ .final_check = TTL_check,
+ .print = TTL_print,
+ .save = TTL_save,
+ .extra_opts = TTL_opts,
+};
+
+void _init(void)
+{
+ xtables_register_target(&ttl_tg_reg);
+}