--- /dev/null
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <getopt.h>
+#include <math.h>
+
+#include <xtables.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_RATEEST.h>
+
+/* hack to pass raw values to final_check */
+static struct xt_rateest_target_info *RATEEST_info;
+static unsigned int interval;
+static unsigned int ewma_log;
+
+static void
+RATEEST_help(void)
+{
+ printf(
+"RATEEST target options:\n"
+" --rateest-name name Rate estimator name\n"
+" --rateest-interval sec Rate measurement interval in seconds\n"
+" --rateest-ewmalog value Rate measurement averaging time constant\n");
+}
+
+enum RATEEST_options {
+ RATEEST_OPT_NAME,
+ RATEEST_OPT_INTERVAL,
+ RATEEST_OPT_EWMALOG,
+};
+
+static const struct option RATEEST_opts[] = {
+ { "rateest-name", 1, NULL, RATEEST_OPT_NAME },
+ { "rateest-interval", 1, NULL, RATEEST_OPT_INTERVAL },
+ { "rateest-ewmalog", 1, NULL, RATEEST_OPT_EWMALOG },
+ { .name = NULL },
+};
+
+/* Copied from iproute */
+#define TIME_UNITS_PER_SEC 1000000
+
+static int
+RATEEST_get_time(unsigned int *time, const char *str)
+{
+ double t;
+ char *p;
+
+ t = strtod(str, &p);
+ if (p == str)
+ return -1;
+
+ if (*p) {
+ if (strcasecmp(p, "s") == 0 || strcasecmp(p, "sec")==0 ||
+ strcasecmp(p, "secs")==0)
+ t *= TIME_UNITS_PER_SEC;
+ else if (strcasecmp(p, "ms") == 0 || strcasecmp(p, "msec")==0 ||
+ strcasecmp(p, "msecs") == 0)
+ t *= TIME_UNITS_PER_SEC/1000;
+ else if (strcasecmp(p, "us") == 0 || strcasecmp(p, "usec")==0 ||
+ strcasecmp(p, "usecs") == 0)
+ t *= TIME_UNITS_PER_SEC/1000000;
+ else
+ return -1;
+ }
+
+ *time = t;
+ return 0;
+}
+
+static void
+RATEEST_print_time(unsigned int time)
+{
+ double tmp = time;
+
+ if (tmp >= TIME_UNITS_PER_SEC)
+ printf("%.1fs ", tmp/TIME_UNITS_PER_SEC);
+ else if (tmp >= TIME_UNITS_PER_SEC/1000)
+ printf("%.1fms ", tmp/(TIME_UNITS_PER_SEC/1000));
+ else
+ printf("%uus ", time);
+}
+
+static void
+RATEEST_init(struct xt_entry_target *target)
+{
+ interval = 0;
+ ewma_log = 0;
+}
+
+static int
+RATEEST_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_entry_target **target)
+{
+ struct xt_rateest_target_info *info = (void *)(*target)->data;
+
+ RATEEST_info = info;
+
+ switch (c) {
+ case RATEEST_OPT_NAME:
+ if (*flags & (1 << c))
+ exit_error(PARAMETER_PROBLEM,
+ "RATEEST: can't specify --rateest-name twice");
+ *flags |= 1 << c;
+
+ strncpy(info->name, optarg, sizeof(info->name) - 1);
+ break;
+
+ case RATEEST_OPT_INTERVAL:
+ if (*flags & (1 << c))
+ exit_error(PARAMETER_PROBLEM,
+ "RATEEST: can't specify --rateest-interval twice");
+ *flags |= 1 << c;
+
+ if (RATEEST_get_time(&interval, optarg) < 0)
+ exit_error(PARAMETER_PROBLEM,
+ "RATEEST: bad interval value `%s'", optarg);
+
+ break;
+
+ case RATEEST_OPT_EWMALOG:
+ if (*flags & (1 << c))
+ exit_error(PARAMETER_PROBLEM,
+ "RATEEST: can't specify --rateest-ewmalog twice");
+ *flags |= 1 << c;
+
+ if (RATEEST_get_time(&ewma_log, optarg) < 0)
+ exit_error(PARAMETER_PROBLEM,
+ "RATEEST: bad ewmalog value `%s'", optarg);
+
+ break;
+
+ default:
+ return 0;
+ }
+
+ return 1;
+}
+
+static void
+RATEEST_final_check(unsigned int flags)
+{
+ struct xt_rateest_target_info *info = RATEEST_info;
+
+ if (!(flags & (1 << RATEEST_OPT_NAME)))
+ exit_error(PARAMETER_PROBLEM, "RATEEST: no name specified");
+ if (!(flags & (1 << RATEEST_OPT_INTERVAL)))
+ exit_error(PARAMETER_PROBLEM, "RATEEST: no interval specified");
+ if (!(flags & (1 << RATEEST_OPT_EWMALOG)))
+ exit_error(PARAMETER_PROBLEM, "RATEEST: no ewmalog specified");
+
+ for (info->interval = 0; info->interval <= 5; info->interval++) {
+ if (interval <= (1 << info->interval) * (TIME_UNITS_PER_SEC / 4))
+ break;
+ }
+
+ if (info->interval > 5)
+ exit_error(PARAMETER_PROBLEM,
+ "RATEEST: interval value is too large");
+ info->interval -= 2;
+
+ for (info->ewma_log = 1; info->ewma_log < 32; info->ewma_log++) {
+ double w = 1.0 - 1.0 / (1 << info->ewma_log);
+ if (interval / (-log(w)) > ewma_log)
+ break;
+ }
+ info->ewma_log--;
+
+ if (info->ewma_log == 0 || info->ewma_log >= 31)
+ exit_error(PARAMETER_PROBLEM,
+ "RATEEST: ewmalog value is out of range");
+}
+
+static void
+__RATEEST_print(const struct xt_entry_target *target, const char *prefix)
+{
+ struct xt_rateest_target_info *info = (void *)target->data;
+ unsigned int local_interval;
+ unsigned int local_ewma_log;
+
+ local_interval = (TIME_UNITS_PER_SEC << (info->interval + 2)) / 4;
+ local_ewma_log = local_interval * (1 << (info->ewma_log));
+
+ printf("%sname %s ", prefix, info->name);
+ printf("%sinterval ", prefix);
+ RATEEST_print_time(local_interval);
+ printf("%sewmalog ", prefix);
+ RATEEST_print_time(local_ewma_log);
+}
+
+static void
+RATEEST_print(const void *ip, const struct xt_entry_target *target,
+ int numeric)
+{
+ __RATEEST_print(target, "");
+}
+
+static void
+RATEEST_save(const void *ip, const struct xt_entry_target *target)
+{
+ __RATEEST_print(target, "--rateest-");
+}
+
+static struct xtables_target rateest_tg_reg = {
+ .family = AF_UNSPEC,
+ .name = "RATEEST",
+ .version = XTABLES_VERSION,
+ .size = XT_ALIGN(sizeof(struct xt_rateest_target_info)),
+ .userspacesize = XT_ALIGN(sizeof(struct xt_rateest_target_info)),
+ .help = RATEEST_help,
+ .init = RATEEST_init,
+ .parse = RATEEST_parse,
+ .final_check = RATEEST_final_check,
+ .print = RATEEST_print,
+ .save = RATEEST_save,
+ .extra_opts = RATEEST_opts,
+};
+
+void _init(void)
+{
+ xtables_register_target(&rateest_tg_reg);
+}
git://git.onelab.eu / iptables.git / blobdiff