summaryrefslogtreecommitdiff
path: root/extensions/libxt_statistic.c
diff options
context:
space:
mode:
Diffstat (limited to 'extensions/libxt_statistic.c')
-rw-r--r--extensions/libxt_statistic.c171
1 files changed, 72 insertions, 99 deletions
diff --git a/extensions/libxt_statistic.c b/extensions/libxt_statistic.c
index 913aa2c..b6ae5f5 100644
--- a/extensions/libxt_statistic.c
+++ b/extensions/libxt_statistic.c
@@ -1,144 +1,118 @@
+/*
+ * Copyright (c) 2006-2013 Patrick McHardy <kaber@trash.net>
+ */
+
+#include <math.h>
#include <stdio.h>
-#include <netdb.h>
#include <string.h>
-#include <stdlib.h>
-#include <stddef.h>
-#include <getopt.h>
-
#include <xtables.h>
#include <linux/netfilter/xt_statistic.h>
+enum {
+ O_MODE = 0,
+ O_PROBABILITY,
+ O_EVERY,
+ O_PACKET,
+ F_PROBABILITY = 1 << O_PROBABILITY,
+ F_EVERY = 1 << O_EVERY,
+ F_PACKET = 1 << O_PACKET,
+};
+
static void statistic_help(void)
{
printf(
"statistic match options:\n"
" --mode mode Match mode (random, nth)\n"
" random mode:\n"
-" --probability p Probability\n"
+"[!] --probability p Probability\n"
" nth mode:\n"
-" --every n Match every nth packet\n"
+"[!] --every n Match every nth packet\n"
" --packet p Initial counter value (0 <= p <= n-1, default 0)\n");
}
-static const struct option statistic_opts[] = {
- { "mode", 1, NULL, '1' },
- { "probability", 1, NULL, '2' },
- { "every", 1, NULL, '3' },
- { "packet", 1, NULL, '4' },
- { .name = NULL }
+#define s struct xt_statistic_info
+static const struct xt_option_entry statistic_opts[] = {
+ {.name = "mode", .id = O_MODE, .type = XTTYPE_STRING,
+ .flags = XTOPT_MAND},
+ {.name = "probability", .id = O_PROBABILITY, .type = XTTYPE_DOUBLE,
+ .flags = XTOPT_INVERT, .min = 0, .max = 1,
+ .excl = F_EVERY | F_PACKET},
+ {.name = "every", .id = O_EVERY, .type = XTTYPE_UINT32, .min = 1,
+ .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, u.nth.every),
+ .excl = F_PROBABILITY, .also = F_PACKET},
+ {.name = "packet", .id = O_PACKET, .type = XTTYPE_UINT32,
+ .flags = XTOPT_PUT, XTOPT_POINTER(s, u.nth.packet),
+ .excl = F_PROBABILITY, .also = F_EVERY},
+ XTOPT_TABLEEND,
};
+#undef s
-static struct xt_statistic_info *global_info;
-
-static void statistic_mt_init(struct xt_entry_match *match)
-{
- global_info = (void *)match->data;
-}
-
-static int
-statistic_parse(int c, char **argv, int invert, unsigned int *flags,
- const void *entry, struct xt_entry_match **match)
+static void statistic_parse(struct xt_option_call *cb)
{
- struct xt_statistic_info *info = (void *)(*match)->data;
- unsigned int val;
- double prob;
+ struct xt_statistic_info *info = cb->data;
- if (invert)
+ if (cb->invert)
info->flags |= XT_STATISTIC_INVERT;
- switch (c) {
- case '1':
- if (*flags & 0x1)
- xtables_error(PARAMETER_PROBLEM, "double --mode");
- if (!strcmp(optarg, "random"))
+ xtables_option_parse(cb);
+ switch (cb->entry->id) {
+ case O_MODE:
+ if (strcmp(cb->arg, "random") == 0)
info->mode = XT_STATISTIC_MODE_RANDOM;
- else if (!strcmp(optarg, "nth"))
+ else if (strcmp(cb->arg, "nth") == 0)
info->mode = XT_STATISTIC_MODE_NTH;
else
- xtables_error(PARAMETER_PROBLEM, "Bad mode \"%s\"", optarg);
- *flags |= 0x1;
+ xtables_error(PARAMETER_PROBLEM, "Bad mode \"%s\"",
+ cb->arg);
break;
- case '2':
- if (*flags & 0x2)
- xtables_error(PARAMETER_PROBLEM, "double --probability");
- prob = atof(optarg);
- if (prob < 0 || prob > 1)
- xtables_error(PARAMETER_PROBLEM,
- "--probability must be between 0 and 1");
- info->u.random.probability = 0x80000000 * prob;
- *flags |= 0x2;
+ case O_PROBABILITY:
+ info->u.random.probability = lround(0x80000000 * cb->val.dbl);
break;
- case '3':
- if (*flags & 0x4)
- xtables_error(PARAMETER_PROBLEM, "double --every");
- if (!xtables_strtoui(optarg, NULL, &val, 0, UINT32_MAX))
- xtables_error(PARAMETER_PROBLEM,
- "cannot parse --every `%s'", optarg);
- info->u.nth.every = val;
- if (info->u.nth.every == 0)
- xtables_error(PARAMETER_PROBLEM, "--every cannot be 0");
- info->u.nth.every--;
- *flags |= 0x4;
+ case O_EVERY:
+ --info->u.nth.every;
break;
- case '4':
- if (*flags & 0x8)
- xtables_error(PARAMETER_PROBLEM, "double --packet");
- if (!xtables_strtoui(optarg, NULL, &val, 0, UINT32_MAX))
- xtables_error(PARAMETER_PROBLEM,
- "cannot parse --packet `%s'", optarg);
- info->u.nth.packet = val;
- *flags |= 0x8;
- break;
- default:
- return 0;
}
- return 1;
}
-static void statistic_check(unsigned int flags)
+static void statistic_check(struct xt_fcheck_call *cb)
{
- if (!(flags & 0x1))
- xtables_error(PARAMETER_PROBLEM, "no mode specified");
- if ((flags & 0x2) && (flags & (0x4 | 0x8)))
- xtables_error(PARAMETER_PROBLEM,
- "both nth and random parameters given");
- if (flags & 0x2 && global_info->mode != XT_STATISTIC_MODE_RANDOM)
- xtables_error(PARAMETER_PROBLEM,
- "--probability can only be used in random mode");
- if (flags & 0x4 && global_info->mode != XT_STATISTIC_MODE_NTH)
- xtables_error(PARAMETER_PROBLEM,
- "--every can only be used in nth mode");
- if (flags & 0x8 && global_info->mode != XT_STATISTIC_MODE_NTH)
+ struct xt_statistic_info *info = cb->data;
+
+ if (info->mode == XT_STATISTIC_MODE_RANDOM &&
+ !(cb->xflags & F_PROBABILITY))
xtables_error(PARAMETER_PROBLEM,
- "--packet can only be used in nth mode");
- if ((flags & 0x8) && !(flags & 0x4))
+ "--probability must be specified when using "
+ "random mode");
+ if (info->mode == XT_STATISTIC_MODE_NTH &&
+ !(cb->xflags & (F_EVERY | F_PACKET)))
xtables_error(PARAMETER_PROBLEM,
- "--packet can only be used with --every");
+ "--every and --packet must be specified when "
+ "using nth mode");
+
/* at this point, info->u.nth.every have been decreased. */
- if (global_info->u.nth.packet > global_info->u.nth.every)
+ if (info->u.nth.packet > info->u.nth.every)
xtables_error(PARAMETER_PROBLEM,
"the --packet p must be 0 <= p <= n-1");
-
- global_info->u.nth.count = global_info->u.nth.every -
- global_info->u.nth.packet;
+ info->u.nth.count = info->u.nth.every - info->u.nth.packet;
}
static void print_match(const struct xt_statistic_info *info, char *prefix)
{
- if (info->flags & XT_STATISTIC_INVERT)
- printf("! ");
-
switch (info->mode) {
case XT_STATISTIC_MODE_RANDOM:
- printf("%smode random %sprobability %f ", prefix, prefix,
+ printf(" %smode random%s %sprobability %.11f", prefix,
+ (info->flags & XT_STATISTIC_INVERT) ? " !" : "",
+ prefix,
1.0 * info->u.random.probability / 0x80000000);
break;
case XT_STATISTIC_MODE_NTH:
- printf("%smode nth %severy %u ", prefix, prefix,
+ printf(" %smode nth%s %severy %u", prefix,
+ (info->flags & XT_STATISTIC_INVERT) ? " !" : "",
+ prefix,
info->u.nth.every + 1);
- if (info->u.nth.packet)
- printf("%spacket %u ", prefix, info->u.nth.packet);
+ if (info->u.nth.packet || *prefix)
+ printf(" %spacket %u", prefix, info->u.nth.packet);
break;
}
}
@@ -148,7 +122,7 @@ statistic_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_statistic_info *info = (const void *)match->data;
- printf("statistic ");
+ printf(" statistic");
print_match(info, "");
}
@@ -165,13 +139,12 @@ static struct xtables_match statistic_match = {
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_statistic_info)),
.userspacesize = offsetof(struct xt_statistic_info, u.nth.count),
- .init = statistic_mt_init,
.help = statistic_help,
- .parse = statistic_parse,
- .final_check = statistic_check,
+ .x6_parse = statistic_parse,
+ .x6_fcheck = statistic_check,
.print = statistic_print,
.save = statistic_save,
- .extra_opts = statistic_opts,
+ .x6_options = statistic_opts,
};
void _init(void)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-25 17:32:36 +0000