From 4aca87515a5083ae0e31ce3177189fd43b6d05ac Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sat, 3 Jan 2015 13:58:15 +0100
Subject: patch to Vanilla Tomato 1.28

---
 .../src/linux/linux/net/ipv4/netfilter/tomato_ct.c | 181 +++++++++++++++++++++
 1 file changed, 181 insertions(+)
 create mode 100644 release/src/linux/linux/net/ipv4/netfilter/tomato_ct.c

(limited to 'release/src/linux/linux/net/ipv4/netfilter/tomato_ct.c')

diff --git a/release/src/linux/linux/net/ipv4/netfilter/tomato_ct.c b/release/src/linux/linux/net/ipv4/netfilter/tomato_ct.c
new file mode 100644
index 00000000..a84cab09
--- /dev/null
+++ b/release/src/linux/linux/net/ipv4/netfilter/tomato_ct.c
@@ -0,0 +1,181 @@
+/*
+
+	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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