* - now capable of multiple expectations for one master
* */
-#include <linux/config.h>
#include <linux/types.h>
#include <linux/icmp.h>
#include <linux/ip.h>
#include <net/checksum.h>
#include <linux/spinlock.h>
-#define ASSERT_READ_LOCK(x)
-#define ASSERT_WRITE_LOCK(x)
-
#include <linux/netfilter_ipv4/ip_nat.h>
#include <linux/netfilter_ipv4/ip_nat_rule.h>
#include <linux/netfilter_ipv4/ip_nat_protocol.h>
#include <linux/netfilter_ipv4/ip_nat_helper.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ip_conntrack_core.h>
-#include <linux/netfilter_ipv4/listhelp.h>
#if 0
#define DEBUGP printk
#define DEBUGP(format, args...)
#endif
-#define HOOKNAME(hooknum) ((hooknum) == NF_IP_POST_ROUTING ? "POST_ROUTING" \
- : ((hooknum) == NF_IP_PRE_ROUTING ? "PRE_ROUTING" \
- : ((hooknum) == NF_IP_LOCAL_OUT ? "LOCAL_OUT" \
- : ((hooknum) == NF_IP_LOCAL_IN ? "LOCAL_IN" \
- : "*ERROR*")))
+#ifdef CONFIG_XFRM
+static void nat_decode_session(struct sk_buff *skb, struct flowi *fl)
+{
+ struct ip_conntrack *ct;
+ struct ip_conntrack_tuple *t;
+ enum ip_conntrack_info ctinfo;
+ enum ip_conntrack_dir dir;
+ unsigned long statusbit;
+
+ ct = ip_conntrack_get(skb, &ctinfo);
+ if (ct == NULL)
+ return;
+ dir = CTINFO2DIR(ctinfo);
+ t = &ct->tuplehash[dir].tuple;
+
+ if (dir == IP_CT_DIR_ORIGINAL)
+ statusbit = IPS_DST_NAT;
+ else
+ statusbit = IPS_SRC_NAT;
+
+ if (ct->status & statusbit) {
+ fl->fl4_dst = t->dst.ip;
+ if (t->dst.protonum == IPPROTO_TCP ||
+ t->dst.protonum == IPPROTO_UDP)
+ fl->fl_ip_dport = t->dst.u.tcp.port;
+ }
+
+ statusbit ^= IPS_NAT_MASK;
+ if (ct->status & statusbit) {
+ fl->fl4_src = t->src.ip;
+ if (t->dst.protonum == IPPROTO_TCP ||
+ t->dst.protonum == IPPROTO_UDP)
+ fl->fl_ip_sport = t->src.u.tcp.port;
+ }
+}
+#endif
+
static unsigned int
ip_nat_fn(unsigned int hooknum,
struct sk_buff **pskb,
IP_NF_ASSERT(!((*pskb)->nh.iph->frag_off
& htons(IP_MF|IP_OFFSET)));
- /* If we had a hardware checksum before, it's now invalid */
- if ((*pskb)->ip_summed == CHECKSUM_HW)
- if (skb_checksum_help(*pskb, (out == NULL)))
- return NF_DROP;
-
ct = ip_conntrack_get(*pskb, &ctinfo);
/* Can't track? It's not due to stress, or conntrack would
have dropped it. Hence it's the user's responsibilty to
case IP_CT_RELATED:
case IP_CT_RELATED+IP_CT_IS_REPLY:
if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
- if (!ip_nat_icmp_reply_translation(pskb, ct, maniptype,
- CTINFO2DIR(ctinfo)))
+ if (!ip_nat_icmp_reply_translation(ct, ctinfo,
+ hooknum, pskb))
return NF_DROP;
else
return NF_ACCEPT;
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
- u_int32_t saddr, daddr;
unsigned int ret;
-
- saddr = (*pskb)->nh.iph->saddr;
- daddr = (*pskb)->nh.iph->daddr;
+ __be32 daddr = (*pskb)->nh.iph->daddr;
ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
if (ret != NF_DROP && ret != NF_STOLEN
- && ((*pskb)->nh.iph->saddr != saddr
- || (*pskb)->nh.iph->daddr != daddr)) {
+ && daddr != (*pskb)->nh.iph->daddr) {
dst_release((*pskb)->dst);
(*pskb)->dst = NULL;
}
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
+#ifdef CONFIG_XFRM
+ struct ip_conntrack *ct;
+ enum ip_conntrack_info ctinfo;
+#endif
+ unsigned int ret;
+
/* root is playing with raw sockets. */
if ((*pskb)->len < sizeof(struct iphdr)
|| (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
return NF_ACCEPT;
- return ip_nat_fn(hooknum, pskb, in, out, okfn);
+ ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
+#ifdef CONFIG_XFRM
+ if (ret != NF_DROP && ret != NF_STOLEN
+ && (ct = ip_conntrack_get(*pskb, &ctinfo)) != NULL) {
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+
+ if (ct->tuplehash[dir].tuple.src.ip !=
+ ct->tuplehash[!dir].tuple.dst.ip
+ || ct->tuplehash[dir].tuple.src.u.all !=
+ ct->tuplehash[!dir].tuple.dst.u.all
+ )
+ return ip_xfrm_me_harder(pskb) == 0 ? ret : NF_DROP;
+ }
+#endif
+ return ret;
}
static unsigned int
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
- u_int32_t saddr, daddr;
+ struct ip_conntrack *ct;
+ enum ip_conntrack_info ctinfo;
unsigned int ret;
/* root is playing with raw sockets. */
|| (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
return NF_ACCEPT;
- saddr = (*pskb)->nh.iph->saddr;
- daddr = (*pskb)->nh.iph->daddr;
-
ret = ip_nat_fn(hooknum, pskb, in, out, okfn);
if (ret != NF_DROP && ret != NF_STOLEN
- && ((*pskb)->nh.iph->saddr != saddr
- || (*pskb)->nh.iph->daddr != daddr))
- return ip_route_me_harder(pskb) == 0 ? ret : NF_DROP;
+ && (ct = ip_conntrack_get(*pskb, &ctinfo)) != NULL) {
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+
+ if (ct->tuplehash[dir].tuple.dst.ip !=
+ ct->tuplehash[!dir].tuple.src.ip
+#ifdef CONFIG_XFRM
+ || ct->tuplehash[dir].tuple.dst.u.all !=
+ ct->tuplehash[!dir].tuple.src.u.all
+#endif
+ )
+ if (ip_route_me_harder(pskb, RTN_UNSPEC))
+ ret = NF_DROP;
+ }
return ret;
}
/* We must be after connection tracking and before packet filtering. */
-/* Before packet filtering, change destination */
-static struct nf_hook_ops ip_nat_in_ops = {
- .hook = ip_nat_in,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_PRE_ROUTING,
- .priority = NF_IP_PRI_NAT_DST,
-};
-
-/* After packet filtering, change source */
-static struct nf_hook_ops ip_nat_out_ops = {
- .hook = ip_nat_out,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_POST_ROUTING,
- .priority = NF_IP_PRI_NAT_SRC,
+static struct nf_hook_ops ip_nat_ops[] = {
+ /* Before packet filtering, change destination */
+ {
+ .hook = ip_nat_in,
+ .owner = THIS_MODULE,
+ .pf = PF_INET,
+ .hooknum = NF_IP_PRE_ROUTING,
+ .priority = NF_IP_PRI_NAT_DST,
+ },
+ /* After packet filtering, change source */
+ {
+ .hook = ip_nat_out,
+ .owner = THIS_MODULE,
+ .pf = PF_INET,
+ .hooknum = NF_IP_POST_ROUTING,
+ .priority = NF_IP_PRI_NAT_SRC,
+ },
+ /* After conntrack, adjust sequence number */
+ {
+ .hook = ip_nat_adjust,
+ .owner = THIS_MODULE,
+ .pf = PF_INET,
+ .hooknum = NF_IP_POST_ROUTING,
+ .priority = NF_IP_PRI_NAT_SEQ_ADJUST,
+ },
+ /* Before packet filtering, change destination */
+ {
+ .hook = ip_nat_local_fn,
+ .owner = THIS_MODULE,
+ .pf = PF_INET,
+ .hooknum = NF_IP_LOCAL_OUT,
+ .priority = NF_IP_PRI_NAT_DST,
+ },
+ /* After packet filtering, change source */
+ {
+ .hook = ip_nat_fn,
+ .owner = THIS_MODULE,
+ .pf = PF_INET,
+ .hooknum = NF_IP_LOCAL_IN,
+ .priority = NF_IP_PRI_NAT_SRC,
+ },
+ /* After conntrack, adjust sequence number */
+ {
+ .hook = ip_nat_adjust,
+ .owner = THIS_MODULE,
+ .pf = PF_INET,
+ .hooknum = NF_IP_LOCAL_IN,
+ .priority = NF_IP_PRI_NAT_SEQ_ADJUST,
+ },
};
-/* After conntrack, adjust sequence number */
-static struct nf_hook_ops ip_nat_adjust_out_ops = {
- .hook = ip_nat_adjust,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_POST_ROUTING,
- .priority = NF_IP_PRI_NAT_SEQ_ADJUST,
-};
-
-/* Before packet filtering, change destination */
-static struct nf_hook_ops ip_nat_local_out_ops = {
- .hook = ip_nat_local_fn,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_OUT,
- .priority = NF_IP_PRI_NAT_DST,
-};
-
-/* After packet filtering, change source for reply packets of LOCAL_OUT DNAT */
-static struct nf_hook_ops ip_nat_local_in_ops = {
- .hook = ip_nat_fn,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_IN,
- .priority = NF_IP_PRI_NAT_SRC,
-};
-
-/* After conntrack, adjust sequence number */
-static struct nf_hook_ops ip_nat_adjust_in_ops = {
- .hook = ip_nat_adjust,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_IN,
- .priority = NF_IP_PRI_NAT_SEQ_ADJUST,
-};
-
-
-static int init_or_cleanup(int init)
+static int __init ip_nat_standalone_init(void)
{
int ret = 0;
- need_ip_conntrack();
-
- if (!init) goto cleanup;
+ need_conntrack();
+#ifdef CONFIG_XFRM
+ BUG_ON(ip_nat_decode_session != NULL);
+ ip_nat_decode_session = nat_decode_session;
+#endif
ret = ip_nat_rule_init();
if (ret < 0) {
printk("ip_nat_init: can't setup rules.\n");
- goto cleanup_nothing;
+ goto cleanup_decode_session;
}
- ret = nf_register_hook(&ip_nat_in_ops);
+ ret = nf_register_hooks(ip_nat_ops, ARRAY_SIZE(ip_nat_ops));
if (ret < 0) {
- printk("ip_nat_init: can't register in hook.\n");
+ printk("ip_nat_init: can't register hooks.\n");
goto cleanup_rule_init;
}
- ret = nf_register_hook(&ip_nat_out_ops);
- if (ret < 0) {
- printk("ip_nat_init: can't register out hook.\n");
- goto cleanup_inops;
- }
- ret = nf_register_hook(&ip_nat_adjust_in_ops);
- if (ret < 0) {
- printk("ip_nat_init: can't register adjust in hook.\n");
- goto cleanup_outops;
- }
- ret = nf_register_hook(&ip_nat_adjust_out_ops);
- if (ret < 0) {
- printk("ip_nat_init: can't register adjust out hook.\n");
- goto cleanup_adjustin_ops;
- }
- ret = nf_register_hook(&ip_nat_local_out_ops);
- if (ret < 0) {
- printk("ip_nat_init: can't register local out hook.\n");
- goto cleanup_adjustout_ops;;
- }
- ret = nf_register_hook(&ip_nat_local_in_ops);
- if (ret < 0) {
- printk("ip_nat_init: can't register local in hook.\n");
- goto cleanup_localoutops;
- }
return ret;
- cleanup:
- nf_unregister_hook(&ip_nat_local_in_ops);
- cleanup_localoutops:
- nf_unregister_hook(&ip_nat_local_out_ops);
- cleanup_adjustout_ops:
- nf_unregister_hook(&ip_nat_adjust_out_ops);
- cleanup_adjustin_ops:
- nf_unregister_hook(&ip_nat_adjust_in_ops);
- cleanup_outops:
- nf_unregister_hook(&ip_nat_out_ops);
- cleanup_inops:
- nf_unregister_hook(&ip_nat_in_ops);
cleanup_rule_init:
ip_nat_rule_cleanup();
- cleanup_nothing:
+ cleanup_decode_session:
+#ifdef CONFIG_XFRM
+ ip_nat_decode_session = NULL;
+ synchronize_net();
+#endif
return ret;
}
-static int __init init(void)
-{
- return init_or_cleanup(1);
-}
-
-static void __exit fini(void)
+static void __exit ip_nat_standalone_fini(void)
{
- init_or_cleanup(0);
+ nf_unregister_hooks(ip_nat_ops, ARRAY_SIZE(ip_nat_ops));
+ ip_nat_rule_cleanup();
+#ifdef CONFIG_XFRM
+ ip_nat_decode_session = NULL;
+ synchronize_net();
+#endif
}
-module_init(init);
-module_exit(fini);
+module_init(ip_nat_standalone_init);
+module_exit(ip_nat_standalone_fini);
MODULE_LICENSE("GPL");