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fuzzy: misc cleanup

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This commit is contained in:
Jan Engelhardt
2008-08-31 17:27:15 -04:00
parent 003591fe6f
commit 75e9afbc4a
2 changed files with 50 additions and 82 deletions
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87
extensions/xt_fuzzy.c
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@@ -35,26 +35,26 @@
#define PAR_HIGH 1
MODULE_AUTHOR("Hime Aguiar e Oliveira Junior <hime@engineer.com>");
MODULE_DESCRIPTION("IP tables Fuzzy Logic Controller match module");
MODULE_DESCRIPTION("Xtables: Fuzzy Logic Controller match");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_fuzzy");
static uint8_t mf_high(uint32_t tx,uint32_t mini,uint32_t maxi)
static uint8_t mf_high(uint32_t tx, uint32_t mini, uint32_t maxi)
{
if (tx >= maxi) return 100;
if (tx <= mini) return 0;
return ((100 * (tx-mini)) / (maxi-mini));
if (tx >= maxi)
return 100;
if (tx <= mini)
return 0;
return 100 * (tx - mini) / (maxi - mini);
}
static uint8_t mf_low(uint32_t tx,uint32_t mini,uint32_t maxi)
static uint8_t mf_low(uint32_t tx, uint32_t mini, uint32_t maxi)
{
if (tx <= mini) return 100;
if (tx >= maxi) return 0;
return ((100 * (maxi - tx)) / (maxi - mini));
if (tx <= mini)
return 100;
if (tx >= maxi)
return 0;
return 100 * (maxi - tx) / (maxi - mini);
}
@@ -64,44 +64,39 @@ fuzzy_mt(const struct sk_buff *skb, const struct net_device *in,
const void *matchinfo, int offset, unsigned int protoff,
bool *hotdrop)
{
/* From userspace */
struct xt_fuzzy_mtinfo *info = (void *)matchinfo;
unsigned long amount;
uint8_t howhigh, howlow, random_number;
info->bytes_total += skb->len;
++info->packets_total;
info->present_time = jiffies;
if (info->present_time >= info->previous_time)
if (info->present_time >= info->previous_time) {
amount = info->present_time - info->previous_time;
else {
} else {
/*
* There was a transition: I choose to re-sample
* and keep the old acceptance rate...
*/
amount = 0;
info->previous_time = info->present_time;
info->bytes_total = info->packets_total = 0;
};
}
if ( amount > HZ/10) {/* More than 100 ms elapsed ... */
info->mean_rate = (uint32_t) ((HZ * info->packets_total) \
/ amount);
if (amount > HZ / 10) {
/* More than 100 ms elapsed ... */
info->mean_rate = HZ * info->packets_total / amount;
info->previous_time = info->present_time;
info->bytes_total = info->packets_total = 0;
info->bytes_total = info->packets_total = 0;
howhigh = mf_high(info->mean_rate,info->minimum_rate,info->maximum_rate);
howlow = mf_low(info->mean_rate,info->minimum_rate,info->maximum_rate);
howhigh = mf_high(info->mean_rate, info->minimum_rate,
info->maximum_rate);
howlow = mf_low(info->mean_rate, info->minimum_rate,
info->maximum_rate);
info->acceptance_rate = (uint8_t) \
(howhigh * PAR_LOW + PAR_HIGH * howlow);
info->acceptance_rate = howhigh * PAR_LOW + PAR_HIGH * howlow;
/*
* In fact, the above defuzzification would require a
@@ -112,43 +107,40 @@ fuzzy_mt(const struct sk_buff *skb, const struct net_device *in,
* both mf_high and mf_low - but to keep things understandable,
* I did so.
*/
}
if (info->acceptance_rate < 100)
{
get_random_bytes((void *)(&random_number), 1);
if (info->acceptance_rate < 100) {
get_random_bytes(&random_number, sizeof(random_number));
if (random_number <= (255 * info->acceptance_rate) / 100)
if (random_number <= 255 * info->acceptance_rate / 100)
/*
* If within the acceptance, it can pass
* => do not match.
*/
return 0;
return false;
else
/* It cannot pass (it matches) */
return 1;
return true;
};
/* acceptance_rate == 100 % => Everything passes ... */
return 0;
return false;
}
static bool
fuzzy_mt_check(const char *table, const void *ip, const struct xt_match *match,
void *matchinfo, unsigned int hook_mask)
{
const struct xt_fuzzy_mtinfo *info = matchinfo;
if ((info->minimum_rate < FUZZY_MIN_RATE) || (info->maximum_rate > FUZZY_MAX_RATE)
|| (info->minimum_rate >= info->maximum_rate)) {
printk("ip6t_fuzzy: BAD limits , please verify !!!\n");
return 0;
if (info->minimum_rate < FUZZY_MIN_RATE ||
info->maximum_rate > FUZZY_MAX_RATE ||
info->minimum_rate >= info->maximum_rate) {
printk(KERN_INFO KBUILD_MODNAME ": bad values, please check.\n");
return false;
}
return 1;
return true;
}
static struct xt_match fuzzy_mt_reg = {
@@ -163,10 +155,7 @@ static struct xt_match fuzzy_mt_reg = {
static int __init fuzzy_mt_init(void)
{
if (xt_register_match(&fuzzy_mt_reg))
return -EINVAL;
return 0;
return xt_register_match(&fuzzy_mt_reg);
}
static void __exit fuzzy_mt_exit(void)