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-rw-r--r--include/linux/netfilter_ipv4.h2
-rw-r--r--include/net/netfilter/nf_nat_helper.h3
-rw-r--r--net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c56
-rw-r--r--net/ipv4/netfilter/nf_nat_core.c5
-rw-r--r--net/ipv4/netfilter/nf_nat_helper.c1
-rw-r--r--net/ipv4/netfilter/nf_nat_standalone.c35
6 files changed, 35 insertions, 67 deletions
diff --git a/include/linux/netfilter_ipv4.h b/include/linux/netfilter_ipv4.h
index 9a10092e358c..650318b0c405 100644
--- a/include/linux/netfilter_ipv4.h
+++ b/include/linux/netfilter_ipv4.h
@@ -62,8 +62,6 @@ enum nf_ip_hook_priorities {
NF_IP_PRI_FILTER = 0,
NF_IP_PRI_NAT_SRC = 100,
NF_IP_PRI_SELINUX_LAST = 225,
- NF_IP_PRI_CONNTRACK_HELPER = INT_MAX - 2,
- NF_IP_PRI_NAT_SEQ_ADJUST = INT_MAX - 1,
NF_IP_PRI_CONNTRACK_CONFIRM = INT_MAX,
NF_IP_PRI_LAST = INT_MAX,
};
diff --git a/include/net/netfilter/nf_nat_helper.h b/include/net/netfilter/nf_nat_helper.h
index 58dd22687949..237a961f40e1 100644
--- a/include/net/netfilter/nf_nat_helper.h
+++ b/include/net/netfilter/nf_nat_helper.h
@@ -24,6 +24,9 @@ extern int nf_nat_mangle_udp_packet(struct sk_buff *skb,
extern int nf_nat_seq_adjust(struct sk_buff *skb,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo);
+extern int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo);
/* Setup NAT on this expected conntrack so it follows master, but goes
* to port ct->master->saved_proto. */
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index a65b845c5f15..41e79613eb0a 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -23,6 +23,12 @@
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
+#include <net/netfilter/nf_nat_helper.h>
+
+int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb,
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo);
+EXPORT_SYMBOL_GPL(nf_nat_seq_adjust_hook);
static int ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff,
struct nf_conntrack_tuple *tuple)
@@ -101,35 +107,41 @@ static unsigned int ipv4_confirm(unsigned int hooknum,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
- /* We've seen it coming out the other side: confirm it */
- return nf_conntrack_confirm(skb);
-}
-
-static unsigned int ipv4_conntrack_help(unsigned int hooknum,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
const struct nf_conn_help *help;
const struct nf_conntrack_helper *helper;
+ unsigned int ret;
/* This is where we call the helper: as the packet goes out. */
ct = nf_ct_get(skb, &ctinfo);
if (!ct || ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY)
- return NF_ACCEPT;
+ goto out;
help = nfct_help(ct);
if (!help)
- return NF_ACCEPT;
+ goto out;
+
/* rcu_read_lock()ed by nf_hook_slow */
helper = rcu_dereference(help->helper);
if (!helper)
- return NF_ACCEPT;
- return helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb),
- ct, ctinfo);
+ goto out;
+
+ ret = helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb),
+ ct, ctinfo);
+ if (ret != NF_ACCEPT)
+ return ret;
+
+ if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status)) {
+ typeof(nf_nat_seq_adjust_hook) seq_adjust;
+
+ seq_adjust = rcu_dereference(nf_nat_seq_adjust_hook);
+ if (!seq_adjust || !seq_adjust(skb, ct, ctinfo))
+ return NF_DROP;
+ }
+out:
+ /* We've seen it coming out the other side: confirm it */
+ return nf_conntrack_confirm(skb);
}
static unsigned int ipv4_conntrack_defrag(unsigned int hooknum,
@@ -211,20 +223,6 @@ static struct nf_hook_ops ipv4_conntrack_ops[] __read_mostly = {
.priority = NF_IP_PRI_CONNTRACK,
},
{
- .hook = ipv4_conntrack_help,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_INET_POST_ROUTING,
- .priority = NF_IP_PRI_CONNTRACK_HELPER,
- },
- {
- .hook = ipv4_conntrack_help,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_INET_LOCAL_IN,
- .priority = NF_IP_PRI_CONNTRACK_HELPER,
- },
- {
.hook = ipv4_confirm,
.owner = THIS_MODULE,
.pf = PF_INET,
diff --git a/net/ipv4/netfilter/nf_nat_core.c b/net/ipv4/netfilter/nf_nat_core.c
index 9320c7ac5729..25c3efe4207e 100644
--- a/net/ipv4/netfilter/nf_nat_core.c
+++ b/net/ipv4/netfilter/nf_nat_core.c
@@ -618,6 +618,9 @@ static int __init nf_nat_init(void)
nf_conntrack_untracked.status |= IPS_NAT_DONE_MASK;
l3proto = nf_ct_l3proto_find_get((u_int16_t)AF_INET);
+
+ BUG_ON(nf_nat_seq_adjust_hook != NULL);
+ rcu_assign_pointer(nf_nat_seq_adjust_hook, nf_nat_seq_adjust);
return 0;
cleanup_extend:
@@ -644,6 +647,8 @@ static void __exit nf_nat_cleanup(void)
nf_ct_free_hashtable(bysource, nf_nat_vmalloced, nf_nat_htable_size);
nf_ct_l3proto_put(l3proto);
nf_ct_extend_unregister(&nat_extend);
+ rcu_assign_pointer(nf_nat_seq_adjust_hook, NULL);
+ synchronize_net();
}
MODULE_LICENSE("GPL");
diff --git a/net/ipv4/netfilter/nf_nat_helper.c b/net/ipv4/netfilter/nf_nat_helper.c
index 2fca727aa8ba..11976ea29884 100644
--- a/net/ipv4/netfilter/nf_nat_helper.c
+++ b/net/ipv4/netfilter/nf_nat_helper.c
@@ -416,7 +416,6 @@ nf_nat_seq_adjust(struct sk_buff *skb,
return 1;
}
-EXPORT_SYMBOL(nf_nat_seq_adjust);
/* Setup NAT on this expected conntrack so it follows master. */
/* If we fail to get a free NAT slot, we'll get dropped on confirm */
diff --git a/net/ipv4/netfilter/nf_nat_standalone.c b/net/ipv4/netfilter/nf_nat_standalone.c
index a366b5865b9c..b7dd695691a0 100644
--- a/net/ipv4/netfilter/nf_nat_standalone.c
+++ b/net/ipv4/netfilter/nf_nat_standalone.c
@@ -245,25 +245,6 @@ nf_nat_local_fn(unsigned int hooknum,
return ret;
}
-static unsigned int
-nf_nat_adjust(unsigned int hooknum,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- struct nf_conn *ct;
- enum ip_conntrack_info ctinfo;
-
- ct = nf_ct_get(skb, &ctinfo);
- if (ct && test_bit(IPS_SEQ_ADJUST_BIT, &ct->status)) {
- pr_debug("nf_nat_standalone: adjusting sequence number\n");
- if (!nf_nat_seq_adjust(skb, ct, ctinfo))
- return NF_DROP;
- }
- return NF_ACCEPT;
-}
-
/* We must be after connection tracking and before packet filtering. */
static struct nf_hook_ops nf_nat_ops[] __read_mostly = {
@@ -283,14 +264,6 @@ static struct nf_hook_ops nf_nat_ops[] __read_mostly = {
.hooknum = NF_INET_POST_ROUTING,
.priority = NF_IP_PRI_NAT_SRC,
},
- /* After conntrack, adjust sequence number */
- {
- .hook = nf_nat_adjust,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_INET_POST_ROUTING,
- .priority = NF_IP_PRI_NAT_SEQ_ADJUST,
- },
/* Before packet filtering, change destination */
{
.hook = nf_nat_local_fn,
@@ -307,14 +280,6 @@ static struct nf_hook_ops nf_nat_ops[] __read_mostly = {
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP_PRI_NAT_SRC,
},
- /* After conntrack, adjust sequence number */
- {
- .hook = nf_nat_adjust,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_INET_LOCAL_IN,
- .priority = NF_IP_PRI_NAT_SEQ_ADJUST,
- },
};
static int __init nf_nat_standalone_init(void)
generated by cgit v1.2.3 (git 2.0.4) at 2024-06-18 20:02:18 +0000