/usr/src/xtables-addons-1.40/xt_DNETMAP.c is in xtables-addons-dkms 1.40-1.
This file is owned by root:root, with mode 0o644.
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* The mapping can be applied to source (POSTROUTING|OUTPUT)
* or destination (PREROUTING),
*/
/* (C) 2011 Marek Kierdelewicz <marek@koba.pl>
*
* module is dedicated to my wife Eliza and my daughters Jula and Ola :* :* :*
*
* module audited and cleaned-up by Jan Engelhardt
*
* module uses some code and ideas from following modules:
* - "NETMAP" module by Svenning Soerensen <svenning@post5.tele.dk>
* - "recent" module by Stephen Frost <sfrost@snowman.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/ip.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/x_tables.h>
#include <linux/version.h>
#include <net/netfilter/nf_nat_rule.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 34)
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#endif
#include "xt_DNETMAP.h"
#include "compat_xtables.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marek Kierdelewicz <marek@koba.pl>");
MODULE_DESCRIPTION(
"Xtables: dynamic two-way 1:1 NAT mapping of IPv4 addresses");
MODULE_ALIAS("ipt_DNETMAP");
static unsigned int default_ttl = 600;
static unsigned int proc_perms = S_IRUGO | S_IWUSR;
static unsigned int proc_uid;
static unsigned int proc_gid;
static unsigned int default_hash_size = 256;
static unsigned int hash_size = 256;
static unsigned int disable_log;
static unsigned int whole_prefix = 1;
module_param(default_ttl, uint, S_IRUSR);
MODULE_PARM_DESC(default_ttl,
" default ttl value to be used if rule doesn't specify any (default: 600)");
module_param(hash_size, uint, S_IRUSR);
MODULE_PARM_DESC(hash_size,
" hash size for ip lists, needs to be power of 2 (default: 256)");
module_param(disable_log, uint, S_IRUSR);
MODULE_PARM_DESC(disable_log,
" disables logging of bind/timeout events (default: 0)");
module_param(whole_prefix, uint, S_IRUSR);
MODULE_PARM_DESC(whole_prefix,
" use network and broadcast addresses of specified prefix for bindings (default: 1)");
static unsigned int jtimeout;
struct dnetmap_entry {
struct list_head list;
/* priv2entry */
struct list_head glist;
/* pub2entry */
struct list_head grlist;
struct list_head lru_list;
__be32 prenat_addr;
__be32 postnat_addr;
unsigned long stamp;
struct dnetmap_prefix *prefix;
};
struct dnetmap_prefix {
struct nf_nat_multi_range_compat prefix;
char prefix_str[16];
struct list_head list;
unsigned int refcnt;
/* lru entry list */
struct list_head lru_list;
/* hash based on prenat-ips */
struct list_head iphash[0];
};
struct dnetmap_net {
struct list_head prefixes;
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *xt_dnetmap;
#endif
/* global hash */
struct list_head *dnetmap_iphash;
};
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 34)
static int dnetmap_net_id;
static inline struct dnetmap_net *dnetmap_pernet(struct net *net)
{
return net_generic(net, dnetmap_net_id);
}
#else
struct dnetmap_net *dnetmap;
#define dnetmap_pernet(x) dnetmap
#endif
static DEFINE_SPINLOCK(dnetmap_lock);
static DEFINE_MUTEX(dnetmap_mutex);
#ifdef CONFIG_PROC_FS
static const struct file_operations dnetmap_tg_fops;
#endif
static int dnetmap_stat_proc_read(char __user *buffer, char **start,
off_t offset, int length, int *eof,
void *data);
static inline unsigned int dnetmap_entry_hash(const __be32 addr)
{
return ntohl(addr) & (hash_size - 1);
}
static struct dnetmap_entry *
dnetmap_entry_lookup(struct dnetmap_net *dnetmap_net, const __be32 addr)
{
struct dnetmap_entry *e;
unsigned int h;
h = dnetmap_entry_hash(addr);
list_for_each_entry(e, &dnetmap_net->dnetmap_iphash[h], glist)
if (memcmp(&e->prenat_addr, &addr, sizeof(addr)) == 0)
return e;
return NULL;
}
static struct dnetmap_entry *
dnetmap_entry_rlookup(struct dnetmap_net *dnetmap_net, const __be32 addr)
{
struct dnetmap_entry *e;
unsigned int h;
h = dnetmap_entry_hash(addr);
list_for_each_entry(e, &dnetmap_net->dnetmap_iphash[hash_size + h],
grlist)
if (memcmp(&e->postnat_addr, &addr, sizeof(addr)) == 0)
return e;
return NULL;
}
static struct dnetmap_prefix *
dnetmap_prefix_lookup(struct dnetmap_net *dnetmap_net,
const struct nf_nat_multi_range_compat *mr)
{
struct dnetmap_prefix *p;
list_for_each_entry(p, &dnetmap_net->prefixes, list)
if (memcmp(&p->prefix, mr, sizeof(*mr)) == 0)
return p;
return NULL;
}
static void dnetmap_prefix_flush(struct dnetmap_net *dnetmap_net,
struct dnetmap_prefix *p)
{
struct dnetmap_entry *e, *next;
unsigned int i;
for (i = 0; i < hash_size; i++) {
list_for_each_entry_safe(e, next,
&dnetmap_net->dnetmap_iphash[i], glist)
if (e->prefix == p)
list_del(&e->glist);
list_for_each_entry_safe(e, next,
&dnetmap_net->
dnetmap_iphash[hash_size + i], grlist)
if (e->prefix == p)
list_del(&e->grlist);
list_for_each_entry_safe(e, next, &p->iphash[i], list) {
list_del(&e->list);
list_del(&e->lru_list);
kfree(e);
}
}
}
static int dnetmap_tg_check(const struct xt_tgchk_param *par)
{
struct dnetmap_net *dnetmap_net = dnetmap_pernet(par->net);
const struct xt_DNETMAP_tginfo *tginfo = par->targinfo;
const struct nf_nat_multi_range_compat *mr = &tginfo->prefix;
struct dnetmap_prefix *p;
struct dnetmap_entry *e;
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *pde_data, *pde_stat;
char proc_str_data[20];
char proc_str_stat[25];
#endif
int ret = -EINVAL;
int i;
__be32 a;
__u32 ip_min, ip_max, ip;
/* prefix not specified - no need to do anything */
if (!(tginfo->flags & XT_DNETMAP_PREFIX)) {
ret = 0;
return ret;
}
if (!(mr->range[0].flags & IP_NAT_RANGE_MAP_IPS)) {
pr_debug("DNETMAP:check: bad MAP_IPS.\n");
return -EINVAL;
}
if (mr->rangesize != 1) {
pr_debug("DNETMAP:check: bad rangesize %u.\n", mr->rangesize);
return -EINVAL;
}
mutex_lock(&dnetmap_mutex);
p = dnetmap_prefix_lookup(dnetmap_net, mr);
if (p != NULL) {
p->refcnt++;
ret = 0;
goto out;
}
p = kzalloc(sizeof(*p) + sizeof(struct list_head) * hash_size * 2,
GFP_KERNEL);
if (p == NULL) {
ret = -ENOMEM;
goto out;
}
p->refcnt = 1;
memcpy(&p->prefix, mr, sizeof(*mr));
INIT_LIST_HEAD(&p->lru_list);
for (i = 0; i < hash_size * 2; i++)
INIT_LIST_HEAD(&p->iphash[i]);
ip_min = ntohl(mr->range[0].min_ip) + (whole_prefix == 0);
ip_max = ntohl(mr->range[0].max_ip) - (whole_prefix == 0);
sprintf(p->prefix_str, NIPQUAD_FMT "/%u", NIPQUAD(mr->range[0].min_ip),
33 - ffs(~(ip_min ^ ip_max)));
#ifdef CONFIG_PROC_FS
sprintf(proc_str_data, NIPQUAD_FMT "_%u", NIPQUAD(mr->range[0].min_ip),
33 - ffs(~(ip_min ^ ip_max)));
sprintf(proc_str_stat, NIPQUAD_FMT "_%u_stat", NIPQUAD(mr->range[0].min_ip),
33 - ffs(~(ip_min ^ ip_max)));
#endif
printk(KERN_INFO KBUILD_MODNAME ": new prefix %s\n", p->prefix_str);
for (ip = ip_min; ip <= ip_max; ip++) {
a = htonl(ip);
e = kmalloc(sizeof(*e), GFP_ATOMIC);
if (e == NULL)
return 0;
e->postnat_addr = a;
e->prenat_addr = 0;
e->stamp = jiffies;
e->prefix = p;
list_add_tail(&e->lru_list, &p->lru_list);
}
#ifdef CONFIG_PROC_FS
/* data */
pde_data = proc_create_data(proc_str_data, proc_perms,
dnetmap_net->xt_dnetmap,
&dnetmap_tg_fops, p);
if (pde_data == NULL) {
kfree(p);
ret = -ENOMEM;
goto out;
}
pde_data->uid = proc_uid;
pde_data->gid = proc_gid;
/* statistics */
pde_stat = create_proc_entry(proc_str_stat, proc_perms,
dnetmap_net->xt_dnetmap);
if (pde_stat == NULL) {
kfree(p);
ret = -ENOMEM;
goto out;
}
pde_stat->data = p;
pde_stat->read_proc = dnetmap_stat_proc_read;
pde_stat->uid = proc_uid;
pde_stat->gid = proc_gid;
#endif
spin_lock_bh(&dnetmap_lock);
list_add_tail(&p->list, &dnetmap_net->prefixes);
spin_unlock_bh(&dnetmap_lock);
ret = 0;
out:
mutex_unlock(&dnetmap_mutex);
return ret;
}
static unsigned int
dnetmap_tg(struct sk_buff **pskb, const struct xt_action_param *par)
{
struct sk_buff *skb = *pskb;
struct net *net = dev_net(par->in ? par->in : par->out);
struct dnetmap_net *dnetmap_net = dnetmap_pernet(net);
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
__be32 prenat_ip, postnat_ip, prenat_ip_prev;
const struct xt_DNETMAP_tginfo *tginfo = par->targinfo;
const struct nf_nat_multi_range_compat *mr = &tginfo->prefix;
struct nf_nat_range newrange;
struct dnetmap_entry *e;
struct dnetmap_prefix *p;
__s32 jttl;
NF_CT_ASSERT(par->hooknum == NF_INET_POST_ROUTING ||
par->hooknum == NF_INET_LOCAL_OUT ||
par->hooknum == NF_INET_PRE_ROUTING);
ct = nf_ct_get(skb, &ctinfo);
jttl = tginfo->flags & XT_DNETMAP_TTL ? tginfo->ttl * HZ : jtimeout;
/* in prerouting we try to map postnat-ip to prenat-ip */
if (par->hooknum == NF_INET_PRE_ROUTING) {
postnat_ip = ip_hdr(skb)->daddr;
spin_lock_bh(&dnetmap_lock);
e = dnetmap_entry_rlookup(dnetmap_net, postnat_ip);
if (e == NULL)
goto no_rev_map; /* no binding found */
/* if prefix is specified, we check if
it matches lookedup entry */
if (tginfo->flags & XT_DNETMAP_PREFIX)
if (memcmp(mr, &e->prefix, sizeof(*mr)))
goto no_rev_map;
/* don't reset ttl if flag is set */
if (jttl >= 0) {
p = e->prefix;
e->stamp = jiffies + jttl;
list_move_tail(&e->lru_list, &p->lru_list);
}
spin_unlock_bh(&dnetmap_lock);
newrange = ((struct nf_nat_range) {
mr->range[0].flags | IP_NAT_RANGE_MAP_IPS,
e->prenat_addr, e->prenat_addr,
mr->range[0].min, mr->range[0].max});
/* Hand modified range to generic setup. */
return nf_nat_setup_info(ct, &newrange,
HOOK2MANIP(par->hooknum));
}
prenat_ip = ip_hdr(skb)->saddr;
spin_lock_bh(&dnetmap_lock);
p = dnetmap_prefix_lookup(dnetmap_net, mr);
e = dnetmap_entry_lookup(dnetmap_net, prenat_ip);
if (e == NULL) { /* need for new binding */
bind_new_prefix:
e = list_entry(p->lru_list.next, struct dnetmap_entry,
lru_list);
if (e->prenat_addr != 0 && time_before(jiffies, e->stamp)) {
if (!disable_log)
printk(KERN_INFO KBUILD_MODNAME
": ip " NIPQUAD_FMT " - no free adresses in prefix %s\n",
NIPQUAD(prenat_ip), p->prefix_str);
goto no_free_ip;
}
postnat_ip = e->postnat_addr;
if (e->prenat_addr != 0) {
prenat_ip_prev = e->prenat_addr;
if (!disable_log)
printk(KERN_INFO KBUILD_MODNAME
": timeout binding " NIPQUAD_FMT " -> " NIPQUAD_FMT "\n",
NIPQUAD(prenat_ip_prev), NIPQUAD(postnat_ip) );
list_del(&e->list);
list_del(&e->glist);
list_del(&e->grlist);
}
e->prenat_addr = prenat_ip;
e->stamp = jiffies + jttl;
list_move_tail(&e->lru_list, &p->lru_list);
list_add_tail(&e->list,
&p->iphash[dnetmap_entry_hash(prenat_ip)]);
list_add_tail(&e->glist,
&dnetmap_net->
dnetmap_iphash[dnetmap_entry_hash(prenat_ip)]);
list_add_tail(&e->grlist,
&dnetmap_net->dnetmap_iphash[hash_size +
dnetmap_entry_hash
(postnat_ip)]);
if (!disable_log)
printk(KERN_INFO KBUILD_MODNAME
": add binding " NIPQUAD_FMT " -> " NIPQUAD_FMT "\n",
NIPQUAD(prenat_ip),NIPQUAD(postnat_ip));
} else {
if (!(tginfo->flags & XT_DNETMAP_REUSE))
if (time_before(e->stamp, jiffies) && p != e->prefix) {
if (!disable_log)
printk(KERN_INFO KBUILD_MODNAME
": timeout binding " NIPQUAD_FMT " -> " NIPQUAD_FMT "\n",
NIPQUAD(e->prenat_addr),
NIPQUAD(e->postnat_addr));
list_del(&e->list);
list_del(&e->glist);
list_del(&e->grlist);
e->prenat_addr = 0;
goto bind_new_prefix;
}
/* don't reset ttl if flag is set */
if (jttl >= 0) {
e->stamp = jiffies + jttl;
p = e->prefix;
list_move_tail(&e->lru_list, &p->lru_list);
}
postnat_ip = e->postnat_addr;
}
spin_unlock_bh(&dnetmap_lock);
newrange = ((struct nf_nat_range) {
mr->range[0].flags | IP_NAT_RANGE_MAP_IPS,
postnat_ip, postnat_ip,
mr->range[0].min, mr->range[0].max});
/* Hand modified range to generic setup. */
return nf_nat_setup_info(ct, &newrange, HOOK2MANIP(par->hooknum));
no_rev_map:
no_free_ip:
spin_unlock_bh(&dnetmap_lock);
return XT_CONTINUE;
}
static void dnetmap_tg_destroy(const struct xt_tgdtor_param *par)
{
struct dnetmap_net *dnetmap_net = dnetmap_pernet(par->net);
const struct xt_DNETMAP_tginfo *tginfo = par->targinfo;
const struct nf_nat_multi_range_compat *mr = &tginfo->prefix;
struct dnetmap_prefix *p;
#ifdef CONFIG_PROC_FS
char str[25];
#endif
if (!(tginfo->flags & XT_DNETMAP_PREFIX))
return;
mutex_lock(&dnetmap_mutex);
p = dnetmap_prefix_lookup(dnetmap_net, mr);
if (--p->refcnt == 0) {
spin_lock_bh(&dnetmap_lock);
list_del(&p->list);
spin_unlock_bh(&dnetmap_lock);
#ifdef CONFIG_PROC_FS
sprintf(str, NIPQUAD_FMT "_%u", NIPQUAD(mr->range[0].min_ip),
33 - ffs(~(ntohl(mr->range[0].min_ip ^
mr->range[0].max_ip))));
remove_proc_entry(str, dnetmap_net->xt_dnetmap);
sprintf(str, NIPQUAD_FMT "_%u_stat", NIPQUAD(mr->range[0].min_ip),
33 - ffs(~(ntohl(mr->range[0].min_ip ^
mr->range[0].max_ip))));
remove_proc_entry(str, dnetmap_net->xt_dnetmap);
#endif
dnetmap_prefix_flush(dnetmap_net, p);
kfree(p);
}
mutex_unlock(&dnetmap_mutex);
}
#ifdef CONFIG_PROC_FS
struct dnetmap_iter_state {
const struct dnetmap_prefix *p;
unsigned int bucket;
};
static void *dnetmap_seq_start(struct seq_file *seq, loff_t * pos)
__acquires(dnetmap_lock)
{
struct dnetmap_iter_state *st = seq->private;
const struct dnetmap_prefix *prefix = st->p;
struct dnetmap_entry *e;
loff_t p = *pos;
spin_lock_bh(&dnetmap_lock);
list_for_each_entry(e, &prefix->lru_list, lru_list)
if (p-- == 0)
return e;
return NULL;
}
static void *dnetmap_seq_next(struct seq_file *seq, void *v, loff_t * pos)
{
struct dnetmap_iter_state *st = seq->private;
const struct dnetmap_prefix *prefix = st->p;
const struct dnetmap_entry *e = v;
const struct list_head *head = e->lru_list.next;
if (head == &prefix->lru_list)
return NULL;
++*pos;
return list_entry(head, struct dnetmap_entry, lru_list);
}
static void dnetmap_seq_stop(struct seq_file *s, void *v)
__releases(dnetmap_lock)
{
spin_unlock_bh(&dnetmap_lock);
}
static int dnetmap_seq_show(struct seq_file *seq, void *v)
{
const struct dnetmap_entry *e = v;
seq_printf(seq, NIPQUAD_FMT " -> " NIPQUAD_FMT " --- ttl: %d lasthit: %lu\n",
NIPQUAD(e->prenat_addr), NIPQUAD(e->postnat_addr),
(int)(e->stamp - jiffies) / HZ, (e->stamp - jtimeout) / HZ);
return 0;
}
static const struct seq_operations dnetmap_seq_ops = {
.start = dnetmap_seq_start,
.next = dnetmap_seq_next,
.stop = dnetmap_seq_stop,
.show = dnetmap_seq_show,
};
static int dnetmap_seq_open(struct inode *inode, struct file *file)
{
struct proc_dir_entry *pde = PDE(inode);
struct dnetmap_iter_state *st;
st = __seq_open_private(file, &dnetmap_seq_ops, sizeof(*st));
if (st == NULL)
return -ENOMEM;
st->p = pde->data;
return 0;
}
static const struct file_operations dnetmap_tg_fops = {
.open = dnetmap_seq_open,
.read = seq_read,
.release = seq_release_private,
.owner = THIS_MODULE,
};
/* for statistics */
static int dnetmap_stat_proc_read(char __user *buffer, char **start,
off_t offset, int length, int *eof,
void *data)
{
const struct dnetmap_prefix *p = data;
struct dnetmap_entry *e;
unsigned int used, all;
long int ttl, sum_ttl;
used = 0;
all = 0;
sum_ttl = 0;
spin_lock_bh(&dnetmap_lock);
list_for_each_entry(e, &p->lru_list, lru_list) {
ttl = e->stamp - jiffies;
if (e->prenat_addr != 0 && ttl >= 0) {
used++;
sum_ttl += ttl;
}
all++;
}
sum_ttl = used > 0 ? sum_ttl / (used * HZ) : 0;
sprintf(buffer, "%u %u %ld\n", used, all, sum_ttl);
if (length >= strlen(buffer))
*eof = true;
spin_unlock_bh(&dnetmap_lock);
return strlen(buffer);
}
static int __net_init dnetmap_proc_net_init(struct net *net)
{
struct dnetmap_net *dnetmap_net = dnetmap_pernet(net);
dnetmap_net->xt_dnetmap = proc_mkdir("xt_DNETMAP", net->proc_net);
if (dnetmap_net->xt_dnetmap == NULL)
return -ENOMEM;
return 0;
}
static void __net_exit dnetmap_proc_net_exit(struct net *net)
{
proc_net_remove(net, "xt_DNETMAP");
}
#else
static inline int dnetmap_proc_net_init(struct net *net)
{
return 0;
}
static inline void dnetmap_proc_net_exit(struct net *net)
{
}
#endif /* CONFIG_PROC_FS */
static int __net_init dnetmap_net_init(struct net *net)
{
struct dnetmap_net *dnetmap_net = dnetmap_pernet(net);
int i;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 34)
dnetmap = kmalloc(sizeof(struct dnetmap_net),GFP_ATOMIC);
if (dnetmap == NULL)
return -ENOMEM;
dnetmap_net = dnetmap;
#endif
dnetmap_net->dnetmap_iphash = kmalloc(sizeof(struct list_head) *
hash_size * 2, GFP_ATOMIC);
if (dnetmap_net->dnetmap_iphash == NULL)
return -ENOMEM;
INIT_LIST_HEAD(&dnetmap_net->prefixes);
for (i = 0; i < hash_size * 2; i++)
INIT_LIST_HEAD(&dnetmap_net->dnetmap_iphash[i]);
return dnetmap_proc_net_init(net);
}
static void __net_exit dnetmap_net_exit(struct net *net)
{
struct dnetmap_net *dnetmap_net = dnetmap_pernet(net);
BUG_ON(!list_empty(&dnetmap_net->prefixes));
kfree(dnetmap_net->dnetmap_iphash);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 34)
kfree(dnetmap_net);
#endif
dnetmap_proc_net_exit(net);
}
static struct pernet_operations dnetmap_net_ops = {
.init = dnetmap_net_init,
.exit = dnetmap_net_exit,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 34)
.id = &dnetmap_net_id,
.size = sizeof(struct dnetmap_net),
#endif
};
static struct xt_target dnetmap_tg_reg __read_mostly = {
.name = "DNETMAP",
.family = NFPROTO_IPV4,
.target = dnetmap_tg,
.targetsize = sizeof(struct xt_DNETMAP_tginfo),
.table = "nat",
.hooks = (1 << NF_INET_POST_ROUTING) | (1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_PRE_ROUTING),
.checkentry = dnetmap_tg_check,
.destroy = dnetmap_tg_destroy,
.me = THIS_MODULE
};
static int __init dnetmap_tg_init(void)
{
int err;
/* verify parameters */
if (ffs(hash_size) != fls(hash_size) || hash_size <= 0) {
pr_info("bad hash_size parameter value - using defaults");
hash_size = default_hash_size;
}
jtimeout = default_ttl * HZ;
err = register_pernet_subsys(&dnetmap_net_ops);
if (err)
return err;
err = xt_register_target(&dnetmap_tg_reg);
if (err)
unregister_pernet_subsys(&dnetmap_net_ops);
return err;
}
static void __exit dnetmap_tg_exit(void)
{
xt_unregister_target(&dnetmap_tg_reg);
unregister_pernet_subsys(&dnetmap_net_ops);
}
module_init(dnetmap_tg_init);
module_exit(dnetmap_tg_exit);
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