[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/iptables/extensions/libxt_length.c b/ap/app/iptables/extensions/libxt_length.c
new file mode 100755
index 0000000..7bb31a8
--- /dev/null
+++ b/ap/app/iptables/extensions/libxt_length.c
@@ -0,0 +1,133 @@
+/* Shared library add-on to iptables to add packet length matching support. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <xtables.h>
+#include <linux/netfilter/xt_length.h>
+
+static void length_help(void)
+{
+ printf(
+"length match options:\n"
+"[!] --length length[:length] Match packet length against value or range\n"
+" of values (inclusive)\n");
+}
+
+static const struct option length_opts[] = {
+ { "length", 1, NULL, '1' },
+ { .name = NULL }
+};
+
+static u_int16_t
+parse_length(const char *s)
+{
+ unsigned int len;
+
+ if (!xtables_strtoui(s, NULL, &len, 0, UINT32_MAX))
+ xtables_error(PARAMETER_PROBLEM, "length invalid: \"%s\"\n", s);
+ else
+ return len;
+}
+
+/* If a single value is provided, min and max are both set to the value */
+static void
+parse_lengths(const char *s, struct xt_length_info *info)
+{
+ char *buffer;
+ char *cp;
+
+ buffer = strdup(s);
+ if ((cp = strchr(buffer, ':')) == NULL)
+ info->min = info->max = parse_length(buffer);
+ else {
+ *cp = '\0';
+ cp++;
+
+ info->min = buffer[0] ? parse_length(buffer) : 0;
+ info->max = cp[0] ? parse_length(cp) : 0xFFFF;
+ }
+ free(buffer);
+
+ if (info->min > info->max)
+ xtables_error(PARAMETER_PROBLEM,
+ "length min. range value `%u' greater than max. "
+ "range value `%u'", info->min, info->max);
+
+}
+
+static int
+length_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_entry_match **match)
+{
+ struct xt_length_info *info = (struct xt_length_info *)(*match)->data;
+
+ switch (c) {
+ case '1':
+ if (*flags)
+ xtables_error(PARAMETER_PROBLEM,
+ "length: `--length' may only be "
+ "specified once");
+ xtables_check_inverse(optarg, &invert, &optind, 0);
+ parse_lengths(argv[optind-1], info);
+ if (invert)
+ info->invert = 1;
+ *flags = 1;
+ break;
+
+ default:
+ return 0;
+ }
+ return 1;
+}
+
+static void length_check(unsigned int flags)
+{
+ if (!flags)
+ xtables_error(PARAMETER_PROBLEM,
+ "length: You must specify `--length'");
+}
+
+static void
+length_print(const void *ip, const struct xt_entry_match *match, int numeric)
+{
+ const struct xt_length_info *info = (void *)match->data;
+
+ printf("length %s", info->invert ? "!" : "");
+ if (info->min == info->max)
+ printf("%u ", info->min);
+ else
+ printf("%u:%u ", info->min, info->max);
+}
+
+static void length_save(const void *ip, const struct xt_entry_match *match)
+{
+ const struct xt_length_info *info = (void *)match->data;
+
+ printf("%s--length ", info->invert ? "! " : "");
+ if (info->min == info->max)
+ printf("%u ", info->min);
+ else
+ printf("%u:%u ", info->min, info->max);
+}
+
+static struct xtables_match length_match = {
+ .family = AF_UNSPEC,
+ .name = "length",
+ .version = XTABLES_VERSION,
+ .size = XT_ALIGN(sizeof(struct xt_length_info)),
+ .userspacesize = XT_ALIGN(sizeof(struct xt_length_info)),
+ .help = length_help,
+ .parse = length_parse,
+ .final_check = length_check,
+ .print = length_print,
+ .save = length_save,
+ .extra_opts = length_opts,
+};
+
+void _init(void)
+{
+ xtables_register_match(&length_match);
+}