(depending on route). */
/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
*
* 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.
*/
-#include <linux/config.h>
#include <linux/types.h>
+#include <linux/inetdevice.h>
#include <linux/ip.h>
#include <linux/timer.h>
#include <linux/module.h>
#include <net/protocol.h>
#include <net/ip.h>
#include <net/checksum.h>
+#include <net/route.h>
+#include <net/netfilter/nf_nat_rule.h>
#include <linux/netfilter_ipv4.h>
-#include <linux/netfilter_ipv4/ip_nat_rule.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter/x_tables.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-MODULE_DESCRIPTION("iptables MASQUERADE target module");
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
+MODULE_DESCRIPTION("Xtables: automatic-address SNAT");
/* Lock protects masq region inside conntrack */
-static DECLARE_RWLOCK(masq_lock);
+static DEFINE_RWLOCK(masq_lock);
/* FIXME: Multiple targets. --RR */
-static int
-masquerade_check(const char *tablename,
- const struct ipt_entry *e,
- void *targinfo,
- unsigned int targinfosize,
- unsigned int hook_mask)
+static bool
+masquerade_tg_check(const char *tablename, const void *e,
+ const struct xt_target *target, void *targinfo,
+ unsigned int hook_mask)
{
- const struct ip_nat_multi_range_compat *mr = targinfo;
+ const struct nf_nat_multi_range_compat *mr = targinfo;
- if (strcmp(tablename, "nat") != 0) {
- DEBUGP("masquerade_check: bad table `%s'.\n", tablename);
- return 0;
- }
- if (targinfosize != IPT_ALIGN(sizeof(*mr))) {
- DEBUGP("masquerade_check: size %u != %u.\n",
- targinfosize, sizeof(*mr));
- return 0;
- }
- if (hook_mask & ~(1 << NF_IP_POST_ROUTING)) {
- DEBUGP("masquerade_check: bad hooks %x.\n", hook_mask);
- return 0;
- }
if (mr->range[0].flags & IP_NAT_RANGE_MAP_IPS) {
- DEBUGP("masquerade_check: bad MAP_IPS.\n");
- return 0;
+ pr_debug("masquerade_check: bad MAP_IPS.\n");
+ return false;
}
if (mr->rangesize != 1) {
- DEBUGP("masquerade_check: bad rangesize %u.\n", mr->rangesize);
- return 0;
+ pr_debug("masquerade_check: bad rangesize %u\n", mr->rangesize);
+ return false;
}
- return 1;
+ return true;
}
static unsigned int
-masquerade_target(struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- unsigned int hooknum,
- const void *targinfo,
- void *userinfo)
+masquerade_tg(struct sk_buff *skb, const struct xt_target_param *par)
{
- struct ip_conntrack *ct;
+ struct nf_conn *ct;
+ struct nf_conn_nat *nat;
enum ip_conntrack_info ctinfo;
- const struct ip_nat_multi_range_compat *mr;
- struct ip_nat_range newrange;
- struct rtable *rt;
- u_int32_t newsrc;
+ struct nf_nat_range newrange;
+ const struct nf_nat_multi_range_compat *mr;
+ const struct rtable *rt;
+ __be32 newsrc;
- IP_NF_ASSERT(hooknum == NF_IP_POST_ROUTING);
+ NF_CT_ASSERT(par->hooknum == NF_INET_POST_ROUTING);
- /* FIXME: For the moment, don't do local packets, breaks
- testsuite for 2.3.49 --RR */
- if ((*pskb)->sk)
- return NF_ACCEPT;
+ ct = nf_ct_get(skb, &ctinfo);
+ nat = nfct_nat(ct);
+
+ NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED
+ || ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY));
- ct = ip_conntrack_get(*pskb, &ctinfo);
- IP_NF_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED
- || ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY));
+ /* Source address is 0.0.0.0 - locally generated packet that is
+ * probably not supposed to be masqueraded.
+ */
+ if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip == 0)
+ return NF_ACCEPT;
- mr = targinfo;
- rt = (struct rtable *)(*pskb)->dst;
- newsrc = inet_select_addr(out, rt->rt_gateway, RT_SCOPE_UNIVERSE);
+ mr = par->targinfo;
+ rt = skb->rtable;
+ newsrc = inet_select_addr(par->out, rt->rt_gateway, RT_SCOPE_UNIVERSE);
if (!newsrc) {
- printk("MASQUERADE: %s ate my IP address\n", out->name);
+ printk("MASQUERADE: %s ate my IP address\n", par->out->name);
return NF_DROP;
}
- WRITE_LOCK(&masq_lock);
- ct->nat.masq_index = out->ifindex;
- WRITE_UNLOCK(&masq_lock);
+ write_lock_bh(&masq_lock);
+ nat->masq_index = par->out->ifindex;
+ write_unlock_bh(&masq_lock);
/* Transfer from original range. */
- newrange = ((struct ip_nat_range)
+ newrange = ((struct nf_nat_range)
{ mr->range[0].flags | IP_NAT_RANGE_MAP_IPS,
newsrc, newsrc,
mr->range[0].min, mr->range[0].max });
/* Hand modified range to generic setup. */
- return ip_nat_setup_info(ct, &newrange, hooknum);
+ return nf_nat_setup_info(ct, &newrange, IP_NAT_MANIP_SRC);
}
-static inline int
-device_cmp(struct ip_conntrack *i, void *ifindex)
+static int
+device_cmp(struct nf_conn *i, void *ifindex)
{
+ const struct nf_conn_nat *nat = nfct_nat(i);
int ret;
- READ_LOCK(&masq_lock);
- ret = (i->nat.masq_index == (int)(long)ifindex);
- READ_UNLOCK(&masq_lock);
+ if (!nat)
+ return 0;
+
+ read_lock_bh(&masq_lock);
+ ret = (nat->masq_index == (int)(long)ifindex);
+ read_unlock_bh(&masq_lock);
return ret;
}
unsigned long event,
void *ptr)
{
- struct net_device *dev = ptr;
+ const struct net_device *dev = ptr;
+ struct net *net = dev_net(dev);
if (event == NETDEV_DOWN) {
/* Device was downed. Search entire table for
conntracks which were associated with that device,
and forget them. */
- IP_NF_ASSERT(dev->ifindex != 0);
+ NF_CT_ASSERT(dev->ifindex != 0);
- ip_ct_iterate_cleanup(device_cmp, (void *)(long)dev->ifindex);
+ nf_ct_iterate_cleanup(net, device_cmp,
+ (void *)(long)dev->ifindex);
}
return NOTIFY_DONE;
void *ptr)
{
struct net_device *dev = ((struct in_ifaddr *)ptr)->ifa_dev->dev;
-
- if (event == NETDEV_DOWN) {
- /* IP address was deleted. Search entire table for
- conntracks which were associated with that device,
- and forget them. */
- IP_NF_ASSERT(dev->ifindex != 0);
-
- ip_ct_iterate_cleanup(device_cmp, (void *)(long)dev->ifindex);
- }
-
- return NOTIFY_DONE;
+ return masq_device_event(this, event, dev);
}
static struct notifier_block masq_dev_notifier = {
.notifier_call = masq_inet_event,
};
-static struct ipt_target masquerade = {
+static struct xt_target masquerade_tg_reg __read_mostly = {
.name = "MASQUERADE",
- .target = masquerade_target,
- .checkentry = masquerade_check,
+ .family = NFPROTO_IPV4,
+ .target = masquerade_tg,
+ .targetsize = sizeof(struct nf_nat_multi_range_compat),
+ .table = "nat",
+ .hooks = 1 << NF_INET_POST_ROUTING,
+ .checkentry = masquerade_tg_check,
.me = THIS_MODULE,
};
-static int __init init(void)
+static int __init masquerade_tg_init(void)
{
int ret;
- ret = ipt_register_target(&masquerade);
+ ret = xt_register_target(&masquerade_tg_reg);
if (ret == 0) {
/* Register for device down reports */
return ret;
}
-static void __exit fini(void)
+static void __exit masquerade_tg_exit(void)
{
- ipt_unregister_target(&masquerade);
+ xt_unregister_target(&masquerade_tg_reg);
unregister_netdevice_notifier(&masq_dev_notifier);
- unregister_inetaddr_notifier(&masq_inet_notifier);
+ unregister_inetaddr_notifier(&masq_inet_notifier);
}
-module_init(init);
-module_exit(fini);
+module_init(masquerade_tg_init);
+module_exit(masquerade_tg_exit);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff