---

yaml
---
r: 112105
b: refs/heads/master
c: 73e4022
h: refs/heads/master
i:
  112103: 3188c22
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4de6f16b9ec2422fa7ef9c22f7b1c8d5a55499b4
+refs/heads/master: 73e4022f78acdbe420e8c24a7afbd90f4c8f5077

trunk/include/net/netfilter/ipv4/nf_defrag_ipv4.h

@@ -0,0 +1,6 @@
+#ifndef _NF_DEFRAG_IPV4_H
+#define _NF_DEFRAG_IPV4_H
+
+extern void nf_defrag_ipv4_enable(void);
+
+#endif /* _NF_DEFRAG_IPV4_H */

trunk/net/ipv4/netfilter/Kconfig

@@ -5,10 +5,15 @@
 menu "IP: Netfilter Configuration"
 	depends on INET && NETFILTER
 
+config NF_DEFRAG_IPV4
+	tristate
+	default n
+
 config NF_CONNTRACK_IPV4
 	tristate "IPv4 connection tracking support (required for NAT)"
 	depends on NF_CONNTRACK
 	default m if NETFILTER_ADVANCED=n
+	select NF_DEFRAG_IPV4
 	---help---
 	  Connection tracking keeps a record of what packets have passed
 	  through your machine, in order to figure out how they are related

trunk/net/ipv4/netfilter/Makefile

@@ -18,6 +18,9 @@ obj-$(CONFIG_NF_CONNTRACK_IPV4) += nf_conntrack_ipv4.o
 
 obj-$(CONFIG_NF_NAT) += nf_nat.o
 
+# defrag
+obj-$(CONFIG_NF_DEFRAG_IPV4) += nf_defrag_ipv4.o
+
 # NAT helpers (nf_conntrack)
 obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_amanda.o
 obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o

trunk/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c

@@ -1,3 +1,4 @@
+
 /* (C) 1999-2001 Paul `Rusty' Russell
  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
  *
@@ -24,6 +25,7 @@
 #include <net/netfilter/nf_conntrack_core.h>
 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
 #include <net/netfilter/nf_nat_helper.h>
+#include <net/netfilter/ipv4/nf_defrag_ipv4.h>
 
 int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb,
 			      struct nf_conn *ct,
@@ -63,23 +65,6 @@ static int ipv4_print_tuple(struct seq_file *s,
 			  NIPQUAD(tuple->dst.u3.ip));
 }
 
-/* Returns new sk_buff, or NULL */
-static int nf_ct_ipv4_gather_frags(struct sk_buff *skb, u_int32_t user)
-{
-	int err;
-
-	skb_orphan(skb);
-
-	local_bh_disable();
-	err = ip_defrag(skb, user);
-	local_bh_enable();
-
-	if (!err)
-		ip_send_check(ip_hdr(skb));
-
-	return err;
-}
-
 static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
 			    unsigned int *dataoff, u_int8_t *protonum)
 {
@@ -144,28 +129,6 @@ static unsigned int ipv4_confirm(unsigned int hooknum,
 	return nf_conntrack_confirm(skb);
 }
 
-static unsigned int ipv4_conntrack_defrag(unsigned int hooknum,
-					  struct sk_buff *skb,
-					  const struct net_device *in,
-					  const struct net_device *out,
-					  int (*okfn)(struct sk_buff *))
-{
-	/* Previously seen (loopback)?  Ignore.  Do this before
-	   fragment check. */
-	if (skb->nfct)
-		return NF_ACCEPT;
-
-	/* Gather fragments. */
-	if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {
-		if (nf_ct_ipv4_gather_frags(skb,
-					    hooknum == NF_INET_PRE_ROUTING ?
-					    IP_DEFRAG_CONNTRACK_IN :
-					    IP_DEFRAG_CONNTRACK_OUT))
-			return NF_STOLEN;
-	}
-	return NF_ACCEPT;
-}
-
 static unsigned int ipv4_conntrack_in(unsigned int hooknum,
 				      struct sk_buff *skb,
 				      const struct net_device *in,
@@ -194,27 +157,13 @@ static unsigned int ipv4_conntrack_local(unsigned int hooknum,
 /* Connection tracking may drop packets, but never alters them, so
    make it the first hook. */
 static struct nf_hook_ops ipv4_conntrack_ops[] __read_mostly = {
-	{
-		.hook		= ipv4_conntrack_defrag,
-		.owner		= THIS_MODULE,
-		.pf		= PF_INET,
-		.hooknum	= NF_INET_PRE_ROUTING,
-		.priority	= NF_IP_PRI_CONNTRACK_DEFRAG,
-	},
 	{
 		.hook		= ipv4_conntrack_in,
 		.owner		= THIS_MODULE,
 		.pf		= PF_INET,
 		.hooknum	= NF_INET_PRE_ROUTING,
 		.priority	= NF_IP_PRI_CONNTRACK,
 	},
-	{
-		.hook           = ipv4_conntrack_defrag,
-		.owner          = THIS_MODULE,
-		.pf             = PF_INET,
-		.hooknum        = NF_INET_LOCAL_OUT,
-		.priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
-	},
 	{
 		.hook		= ipv4_conntrack_local,
 		.owner		= THIS_MODULE,
@@ -422,6 +371,7 @@ static int __init nf_conntrack_l3proto_ipv4_init(void)
 	int ret = 0;
 
 	need_conntrack();
+	nf_defrag_ipv4_enable();
 
 	ret = nf_register_sockopt(&so_getorigdst);
 	if (ret < 0) {

trunk/net/ipv4/netfilter/nf_defrag_ipv4.c

@@ -0,0 +1,96 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 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/types.h>
+#include <linux/ip.h>
+#include <linux/netfilter.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/route.h>
+#include <net/ip.h>
+
+#include <linux/netfilter_ipv4.h>
+#include <net/netfilter/ipv4/nf_defrag_ipv4.h>
+
+/* Returns new sk_buff, or NULL */
+static int nf_ct_ipv4_gather_frags(struct sk_buff *skb, u_int32_t user)
+{
+	int err;
+
+	skb_orphan(skb);
+
+	local_bh_disable();
+	err = ip_defrag(skb, user);
+	local_bh_enable();
+
+	if (!err)
+		ip_send_check(ip_hdr(skb));
+
+	return err;
+}
+
+static unsigned int ipv4_conntrack_defrag(unsigned int hooknum,
+					  struct sk_buff *skb,
+					  const struct net_device *in,
+					  const struct net_device *out,
+					  int (*okfn)(struct sk_buff *))
+{
+#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
+	/* Previously seen (loopback)?  Ignore.  Do this before
+	   fragment check. */
+	if (skb->nfct)
+		return NF_ACCEPT;
+#endif
+
+	/* Gather fragments. */
+	if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {
+		if (nf_ct_ipv4_gather_frags(skb,
+					    hooknum == NF_INET_PRE_ROUTING ?
+					    IP_DEFRAG_CONNTRACK_IN :
+					    IP_DEFRAG_CONNTRACK_OUT))
+			return NF_STOLEN;
+	}
+	return NF_ACCEPT;
+}
+
+static struct nf_hook_ops ipv4_defrag_ops[] = {
+	{
+		.hook		= ipv4_conntrack_defrag,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET,
+		.hooknum	= NF_INET_PRE_ROUTING,
+		.priority	= NF_IP_PRI_CONNTRACK_DEFRAG,
+	},
+	{
+		.hook           = ipv4_conntrack_defrag,
+		.owner          = THIS_MODULE,
+		.pf             = PF_INET,
+		.hooknum        = NF_INET_LOCAL_OUT,
+		.priority       = NF_IP_PRI_CONNTRACK_DEFRAG,
+	},
+};
+
+static int __init nf_defrag_init(void)
+{
+	return nf_register_hooks(ipv4_defrag_ops, ARRAY_SIZE(ipv4_defrag_ops));
+}
+
+static void __exit nf_defrag_fini(void)
+{
+	nf_unregister_hooks(ipv4_defrag_ops, ARRAY_SIZE(ipv4_defrag_ops));
+}
+
+void nf_defrag_ipv4_enable(void)
+{
+}
+EXPORT_SYMBOL_GPL(nf_defrag_ipv4_enable);
+
+module_init(nf_defrag_init);
+module_exit(nf_defrag_fini);
+
+MODULE_LICENSE("GPL");