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authorYasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>2007-07-07 22:24:28 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-10 22:17:20 -0700
commit2d59e5ca8c7113ad91452f0f9259a4b55ee90323 (patch)
tree16ffd5284bb5462eaa3af285977389afefca54ca /net/ipv4
parente54cbc1f91dea4f98b6209e693d3b5eae46321bd (diff)
[NETFILTER]: nf_nat: use extension infrastructure
Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c3
-rw-r--r--net/ipv4/netfilter/nf_nat_core.c60
-rw-r--r--net/ipv4/netfilter/nf_nat_standalone.c21
3 files changed, 65 insertions, 19 deletions
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index 6dc72a815f7..96f641d07a4 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -108,9 +108,6 @@ EXPORT_SYMBOL_GPL(nf_nat_module_is_loaded);
static u_int32_t ipv4_get_features(const struct nf_conntrack_tuple *tuple)
{
- if (nf_nat_module_is_loaded)
- return NF_CT_F_NAT;
-
return NF_CT_F_BASIC;
}
diff --git a/net/ipv4/netfilter/nf_nat_core.c b/net/ipv4/netfilter/nf_nat_core.c
index ac7e8abbbde..4ce82d7014f 100644
--- a/net/ipv4/netfilter/nf_nat_core.c
+++ b/net/ipv4/netfilter/nf_nat_core.c
@@ -297,11 +297,21 @@ nf_nat_setup_info(struct nf_conn *ct,
unsigned int hooknum)
{
struct nf_conntrack_tuple curr_tuple, new_tuple;
- struct nf_conn_nat *nat = nfct_nat(ct);
- struct nf_nat_info *info = &nat->info;
+ struct nf_conn_nat *nat;
+ struct nf_nat_info *info;
int have_to_hash = !(ct->status & IPS_NAT_DONE_MASK);
enum nf_nat_manip_type maniptype = HOOK2MANIP(hooknum);
+ /* nat helper or nfctnetlink also setup binding */
+ nat = nfct_nat(ct);
+ if (!nat) {
+ nat = nf_ct_ext_add(ct, NF_CT_EXT_NAT, GFP_ATOMIC);
+ if (nat == NULL) {
+ DEBUGP("failed to add NAT extension\n");
+ return NF_ACCEPT;
+ }
+ }
+
NF_CT_ASSERT(hooknum == NF_IP_PRE_ROUTING ||
hooknum == NF_IP_POST_ROUTING ||
hooknum == NF_IP_LOCAL_IN ||
@@ -338,6 +348,8 @@ nf_nat_setup_info(struct nf_conn *ct,
srchash = hash_by_src(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
write_lock_bh(&nf_nat_lock);
+ /* nf_conntrack_alter_reply might re-allocate exntension aera */
+ info = &nfct_nat(ct)->info;
info->ct = ct;
list_add(&info->bysource, &bysource[srchash]);
write_unlock_bh(&nf_nat_lock);
@@ -592,17 +604,52 @@ nf_nat_port_nfattr_to_range(struct nfattr *tb[], struct nf_nat_range *range)
EXPORT_SYMBOL_GPL(nf_nat_port_range_to_nfattr);
#endif
+static void nf_nat_move_storage(struct nf_conn *conntrack, void *old)
+{
+ struct nf_conn_nat *new_nat = nf_ct_ext_find(conntrack, NF_CT_EXT_NAT);
+ struct nf_conn_nat *old_nat = (struct nf_conn_nat *)old;
+ struct nf_conn *ct = old_nat->info.ct;
+ unsigned int srchash;
+
+ if (!(ct->status & IPS_NAT_DONE_MASK))
+ return;
+
+ srchash = hash_by_src(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+
+ write_lock_bh(&nf_nat_lock);
+ list_replace(&old_nat->info.bysource, &new_nat->info.bysource);
+ new_nat->info.ct = ct;
+ write_unlock_bh(&nf_nat_lock);
+}
+
+struct nf_ct_ext_type nat_extend = {
+ .len = sizeof(struct nf_conn_nat),
+ .align = __alignof__(struct nf_conn_nat),
+ .move = nf_nat_move_storage,
+ .id = NF_CT_EXT_NAT,
+ .flags = NF_CT_EXT_F_PREALLOC,
+};
+
static int __init nf_nat_init(void)
{
size_t i;
+ int ret;
+
+ ret = nf_ct_extend_register(&nat_extend);
+ if (ret < 0) {
+ printk(KERN_ERR "nf_nat_core: Unable to register extension\n");
+ return ret;
+ }
/* Leave them the same for the moment. */
nf_nat_htable_size = nf_conntrack_htable_size;
/* One vmalloc for both hash tables */
bysource = vmalloc(sizeof(struct list_head) * nf_nat_htable_size);
- if (!bysource)
- return -ENOMEM;
+ if (!bysource) {
+ ret = -ENOMEM;
+ goto cleanup_extend;
+ }
/* Sew in builtin protocols. */
write_lock_bh(&nf_nat_lock);
@@ -626,6 +673,10 @@ static int __init nf_nat_init(void)
l3proto = nf_ct_l3proto_find_get((u_int16_t)AF_INET);
return 0;
+
+ cleanup_extend:
+ nf_ct_extend_unregister(&nat_extend);
+ return ret;
}
/* Clear NAT section of all conntracks, in case we're loaded again. */
@@ -647,6 +698,7 @@ static void __exit nf_nat_cleanup(void)
synchronize_rcu();
vfree(bysource);
nf_ct_l3proto_put(l3proto);
+ nf_ct_extend_unregister(&nat_extend);
}
MODULE_LICENSE("GPL");
diff --git a/net/ipv4/netfilter/nf_nat_standalone.c b/net/ipv4/netfilter/nf_nat_standalone.c
index 0b2f0c33f7c..51a2708f7bf 100644
--- a/net/ipv4/netfilter/nf_nat_standalone.c
+++ b/net/ipv4/netfilter/nf_nat_standalone.c
@@ -19,6 +19,7 @@
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_nat_protocol.h>
@@ -113,8 +114,13 @@ nf_nat_fn(unsigned int hooknum,
return NF_ACCEPT;
nat = nfct_nat(ct);
- if (!nat)
- return NF_ACCEPT;
+ if (!nat) {
+ nat = nf_ct_ext_add(ct, NF_CT_EXT_NAT, GFP_ATOMIC);
+ if (nat == NULL) {
+ DEBUGP("failed to add NAT extension\n");
+ return NF_ACCEPT;
+ }
+ }
switch (ctinfo) {
case IP_CT_RELATED:
@@ -326,18 +332,10 @@ static struct nf_hook_ops nf_nat_ops[] = {
static int __init nf_nat_standalone_init(void)
{
- int size, ret = 0;
+ int ret = 0;
need_conntrack();
- size = ALIGN(sizeof(struct nf_conn), __alignof__(struct nf_conn_nat)) +
- sizeof(struct nf_conn_nat);
- ret = nf_conntrack_register_cache(NF_CT_F_NAT, "nf_nat:base", size);
- if (ret < 0) {
- printk(KERN_ERR "nf_nat_init: Unable to create slab cache\n");
- return ret;
- }
-
#ifdef CONFIG_XFRM
BUG_ON(ip_nat_decode_session != NULL);
ip_nat_decode_session = nat_decode_session;
@@ -362,7 +360,6 @@ static int __init nf_nat_standalone_init(void)
ip_nat_decode_session = NULL;
synchronize_net();
#endif
- nf_conntrack_unregister_cache(NF_CT_F_NAT);
return ret;
}