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/*
tomato_ct.c
Copyright (C) 2006 Jonathan Zarate
Licensed under GNU GPL v2.
*/
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/netfilter_ipv4/ip_conntrack.h>
#include <linux/netfilter_ipv4/ip_conntrack_core.h>
// #define TEST_HASHDIST
#ifdef TEST_HASHDIST
static int hashdist_read(char *buffer, char **start, off_t offset, int length, int *eof, void *data)
{
struct list_head *h;
struct list_head *e;
int i;
int n;
int count;
char *buf;
int max;
// do this the easy way...
max = ip_conntrack_htable_size * sizeof("12345\t12345\n");
buf = kmalloc(max + 1, GFP_KERNEL);
if (buf == NULL) return 0;
n = 0;
max -= sizeof("12345\t12345\n");
READ_LOCK(&ip_conntrack_lock);
for (i = 0; i < ip_conntrack_htable_size; ++i) {
count = 0;
h = &ip_conntrack_hash[i];
if (h) {
e = h;
while (e->next != h) {
++count;
e = e->next;
}
}
n += sprintf(buf + n, "%d\t%d\n", i, count);
if (n > max) {
printk("hashdist: %d > %d\n", n, max);
break;
}
}
READ_UNLOCK(&ip_conntrack_lock);
if (offset < n) {
n = n - offset;
if (n > length) {
n = length;
*eof = 0;
}
else {
*eof = 1;
}
memcpy(buffer, buf + offset, n);
*start = buffer;
}
else {
n = 0;
*eof = 1;
}
kfree(buf);
return n;
}
#endif
static void interate_all(void (*func)(struct ip_conntrack *, unsigned long), unsigned long data)
{
int i;
struct list_head *h;
struct list_head *e;
WRITE_LOCK(&ip_conntrack_lock);
for (i = 0; i < ip_conntrack_htable_size; ++i) {
h = &ip_conntrack_hash[i];
if (h) {
e = h;
while (e->next != h) {
e = e->next;
func(((struct ip_conntrack_tuple_hash *)e)->ctrack, data);
}
}
}
WRITE_UNLOCK(&ip_conntrack_lock);
}
static void expireearly(struct ip_conntrack *ct, unsigned long data)
{
if (ct->timeout.expires > data) {
if (del_timer(&ct->timeout)) {
ct->timeout.expires = data;
add_timer(&ct->timeout);
}
}
}
static int expireearly_write(struct file *file, const char *buffer, unsigned long length, void *data)
{
char s[8];
unsigned long n;
if ((length > 0) && (length < 6)) {
memcpy(s, buffer, length);
s[length] = 0;
n = simple_strtoul(s, NULL, 10);
if (n < 10) n = 10;
else if (n > 86400) n = 86400;
interate_all(expireearly, jiffies + (n * HZ));
}
/*
if ((length > 0) && (buffer[0] == '1')) {
interate_all(expireearly, jiffies + (20 * HZ));
}
*/
return length;
}
static void clearmarks(struct ip_conntrack *ct, unsigned long data)
{
ct->mark = 0;
}
static int clearmarks_write(struct file *file, const char *buffer, unsigned long length, void *data)
{
if ((length > 0) && (buffer[0] == '1')) {
interate_all(clearmarks, 0);
}
return length;
}
static int __init init(void)
{
struct proc_dir_entry *p;
printk(__FILE__ " [" __DATE__ " " __TIME__ "]\n");
#ifdef TEST_HASHDIST
p = create_proc_entry("hash_dist", 0400, proc_net);
if (p) p->read_proc = hashdist_read;
#endif
p = create_proc_entry("expire_early", 0200, proc_net);
if (p) p->write_proc = expireearly_write;
p = create_proc_entry("clear_marks", 0200, proc_net);
if (p) p->write_proc = clearmarks_write;
return 0;
}
static void __exit fini(void)
{
#ifdef TEST_HASHDIST
remove_proc_entry("hash_dist", proc_net);
#endif
remove_proc_entry("expire_early", proc_net);
remove_proc_entry("clear_marks", proc_net);
}
module_init(init);
module_exit(fini);
MODULE_LICENSE("GPL");
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