160-netfilter_route.patch

Linux Home Server 是专门为家庭和SOHO/SMB 设计的高性价比的ISCSI 存储服务器, 具有如下的特色： 强大的iscsi 存储服务器软件； 混合iscsi 和NAS 服务；

+				const struct xt_target *target,
+#endif
+				void *targinfo,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
+				unsigned int targinfosize,
+#endif
+				unsigned int hook_mask)
+{
+	if (strcmp(tablename, "mangle") != 0) {
+		printk("ipt_ROUTE: bad table `%s', use the `mangle' table.\n",
+		       tablename);
+		return 0;
+	}
+
+	if (hook_mask & ~(  (1 << NF_IP_PRE_ROUTING)
+			    | (1 << NF_IP_LOCAL_IN)
+			    | (1 << NF_IP_FORWARD)
+			    | (1 << NF_IP_LOCAL_OUT)
+			    | (1 << NF_IP_POST_ROUTING))) {
+		printk("ipt_ROUTE: bad hook\n");
+		return 0;
+	}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
+	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_route_target_info))) {
+		printk(KERN_WARNING "ipt_ROUTE: targinfosize %u != %Zu\n",
+		       targinfosize,
+		       IPT_ALIGN(sizeof(struct ipt_route_target_info)));
+		return 0;
+	}
+#endif
+
+	return 1;
+}
+
+
+static struct ipt_target ipt_route_reg = { 
+	.name = "ROUTE",
+	.target = ipt_route_target,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17)
+	.targetsize = sizeof(struct ipt_route_target_info),
+#endif
+	.checkentry = ipt_route_checkentry,
+	.me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	/* Set up fake conntrack (stolen from raw.patch):
+	    - to never be deleted, not in any hashes */
+	atomic_set(&route_tee_track.ct_general.use, 1);
+	/*  - and look it like as a confirmed connection */
+	set_bit(IPS_CONFIRMED_BIT, &route_tee_track.status);
+	/* Initialize fake conntrack so that NAT will skip it */
+	route_tee_track.status |= IPS_NAT_DONE_MASK;
+
+	return xt_register_target(&ipt_route_reg);
+}
+
+
+static void __exit fini(void)
+{
+	xt_unregister_target(&ipt_route_reg);
+}
+
+module_init(init);
+module_exit(fini);
Index: linux-2.6.21.7/net/ipv4/netfilter/Kconfig
===================================================================
--- linux-2.6.21.7.orig/net/ipv4/netfilter/Kconfig
+++ linux-2.6.21.7/net/ipv4/netfilter/Kconfig
@@ -807,5 +807,22 @@ config IP_NF_TARGET_SET
 	  To compile it as a module, choose M here.  If unsure, say N.
 
 
+config IP_NF_TARGET_ROUTE
+	tristate  'ROUTE target support'
+	depends on IP_NF_MANGLE
+	help
+	  This option adds a `ROUTE' target, which enables you to setup unusual
+	  routes. For example, the ROUTE lets you route a received packet through 
+	  an interface or towards a host, even if the regular destination of the 
+	  packet is the router itself. The ROUTE target is also able to change the 
+	  incoming interface of a packet.
+	
+	  The target can be or not a final target. It has to be used inside the 
+	  mangle table.
+	  
+	  If you want to compile it as a module, say M here and read
+	  Documentation/modules.txt.  The module will be called ipt_ROUTE.o.
+	  If unsure, say `N'.
+
 endmenu
 
Index: linux-2.6.21.7/net/ipv4/netfilter/Makefile
===================================================================
--- linux-2.6.21.7.orig/net/ipv4/netfilter/Makefile
+++ linux-2.6.21.7/net/ipv4/netfilter/Makefile
@@ -102,6 +102,7 @@ obj-$(CONFIG_IP_NF_TARGET_ECN) += ipt_EC
 obj-$(CONFIG_IP_NF_TARGET_IMQ) += ipt_IMQ.o
 obj-$(CONFIG_IP_NF_TARGET_MASQUERADE) += ipt_MASQUERADE.o
 obj-$(CONFIG_IP_NF_TARGET_REDIRECT) += ipt_REDIRECT.o
+obj-$(CONFIG_IP_NF_TARGET_ROUTE) += ipt_ROUTE.o
 obj-$(CONFIG_IP_NF_TARGET_NETMAP) += ipt_NETMAP.o
 obj-$(CONFIG_IP_NF_TARGET_SAME) += ipt_SAME.o
 obj-$(CONFIG_IP_NF_NAT_SNMP_BASIC) += ip_nat_snmp_basic.o
Index: linux-2.6.21.7/net/ipv6/ipv6_syms.c
===================================================================
--- linux-2.6.21.7.orig/net/ipv6/ipv6_syms.c
+++ linux-2.6.21.7/net/ipv6/ipv6_syms.c
@@ -10,6 +10,7 @@ EXPORT_SYMBOL(icmpv6_send);
 EXPORT_SYMBOL(icmpv6_statistics);
 EXPORT_SYMBOL(icmpv6_err_convert);
 EXPORT_SYMBOL(ndisc_mc_map);
+EXPORT_SYMBOL(nd_tbl);
 EXPORT_SYMBOL(register_inet6addr_notifier);
 EXPORT_SYMBOL(unregister_inet6addr_notifier);
 EXPORT_SYMBOL(ip6_route_output);
Index: linux-2.6.21.7/net/ipv6/netfilter/ip6t_ROUTE.c
===================================================================
--- /dev/null
+++ linux-2.6.21.7/net/ipv6/netfilter/ip6t_ROUTE.c
@@ -0,0 +1,330 @@
+/*
+ * This implements the ROUTE v6 target, which enables you to setup unusual
+ * routes not supported by the standard kernel routing table.
+ *
+ * Copyright (C) 2003 Cedric de Launois <[e-mail]>
+ *
+ * v 1.1 2004/11/23
+ *
+ * This software is distributed under GNU GPL v2, 1991
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ipv6.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_ipv6/ip6t_ROUTE.h>
+#include <linux/netdevice.h>
+#include <linux/version.h>
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/ip6_route.h>
+#include <linux/icmpv6.h>
+
+#if 1
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+#define NIP6(addr) \
+	ntohs((addr).s6_addr16[0]), \
+	ntohs((addr).s6_addr16[1]), \
+	ntohs((addr).s6_addr16[2]), \
+	ntohs((addr).s6_addr16[3]), \
+	ntohs((addr).s6_addr16[4]), \
+	ntohs((addr).s6_addr16[5]), \
+	ntohs((addr).s6_addr16[6]), \
+	ntohs((addr).s6_addr16[7])
+
+/* Route the packet according to the routing keys specified in
+ * route_info. Keys are :
+ *  - ifindex : 
+ *      0 if no oif preferred, 
+ *      otherwise set to the index of the desired oif
+ *  - route_info->gw :
+ *      0 if no gateway specified,
+ *      otherwise set to the next host to which the pkt must be routed
+ * If success, skb->dev is the output device to which the packet must 
+ * be sent and skb->dst is not NULL
+ *
+ * RETURN:  1 if the packet was succesfully routed to the 
+ *            destination desired
+ *          0 if the kernel routing table could not route the packet
+ *            according to the keys specified
+ */
+static int 
+route6(struct sk_buff *skb,
+       unsigned int ifindex,
+       const struct ip6t_route_target_info *route_info)
+{
+	struct rt6_info *rt = NULL;
+	struct ipv6hdr *ipv6h = skb->nh.ipv6h;
+	struct in6_addr *gw = (struct in6_addr*)&route_info->gw;
+
+	DEBUGP("ip6t_ROUTE: called with: ");
+	DEBUGP("DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(ipv6h->daddr));
+	DEBUGP("GATEWAY=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(*gw));
+	DEBUGP("OUT=%s\n", route_info->oif);
+	
+	if (ipv6_addr_any(gw))
+		rt = rt6_lookup(&ipv6h->daddr, &ipv6h->saddr, ifindex, 1);
+	else
+		rt = rt6_lookup(gw, &ipv6h->saddr, ifindex, 1);
+
+	if (!rt)
+		goto no_route;
+
+	DEBUGP("ip6t_ROUTE: routing gives: ");
+	DEBUGP("DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(rt->rt6i_dst.addr));
+	DEBUGP("GATEWAY=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", NIP6(rt->rt6i_gateway));
+	DEBUGP("OUT=%s\n", rt->rt6i_dev->name);
+
+	if (ifindex && rt->rt6i_dev->ifindex!=ifindex)
+		goto wrong_route;
+	
+	if (!rt->rt6i_nexthop) {
+		DEBUGP("ip6t_ROUTE: discovering neighbour\n");
+		rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_dst.addr);
+	}
+
+	/* Drop old route. */
+	dst_release(skb->dst);
+	skb->dst = &rt->u.dst;
+	skb->dev = rt->rt6i_dev;
+	return 1;
+
+ wrong_route:
+	dst_release(&rt->u.dst);
+ no_route:
+	if (!net_ratelimit())
+		return 0;
+
+	printk("ip6t_ROUTE: no explicit route found ");
+	if (ifindex)
+		printk("via interface %s ", route_info->oif);
+	if (!ipv6_addr_any(gw))
+		printk("via gateway %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x", NIP6(*gw));
+	printk("\n");
+	return 0;
+}
+
+
+/* Stolen from ip6_output_finish
+ * PRE : skb->dev is set to the device we are leaving by
+ *       skb->dst is not NULL
+ * POST: the packet is sent with the link layer header pushed
+ *       the packet is destroyed
+ */
+static void ip_direct_send(struct sk_buff *skb)
+{
+	struct dst_entry *dst = skb->dst;
+	struct hh_cache *hh = dst->hh;
+
+	if (hh) {
+		read_lock_bh(&hh->hh_lock);
+		memcpy(skb->data - 16, hh->hh_data, 16);
+		read_unlock_bh(&hh->hh_lock);
+		skb_push(skb, hh->hh_len);
+		hh->hh_output(skb);
+	} else if (dst->neighbour)
+		dst->neighbour->output(skb);
+	else {
+		if (net_ratelimit())
+			DEBUGP(KERN_DEBUG "ip6t_ROUTE: no hdr & no neighbour cache!\n");
+		kfree_skb(skb);
+	}
+}
+
+
+static unsigned int 
+route6_oif(const struct ip6t_route_target_info *route_info,
+	   struct sk_buff *skb) 
+{
+	unsigned int ifindex = 0;
+	struct net_device *dev_out = NULL;
+
+	/* The user set the interface name to use.
+	 * Getting the current interface index.
+	 */
+	if ((dev_out = dev_get_by_name(route_info->oif))) {
+		ifindex = dev_out->ifindex;
+	} else {
+		/* Unknown interface name : packet dropped */
+		if (net_ratelimit()) 
+			DEBUGP("ip6t_ROUTE: oif interface %s not found\n", route_info->oif);
+
+		if (route_info->flags & IP6T_ROUTE_CONTINUE)
+			return IP6T_CONTINUE;
+		else
+			return NF_DROP;
+	}
+
+	/* Trying the standard way of routing packets */
+	if (route6(skb, ifindex, route_info)) {
+		dev_put(dev_out);
+		if (route_info->flags & IP6T_ROUTE_CONTINUE)
+			return IP6T_CONTINUE;
+		
+		ip_direct_send(skb);
+		return NF_STOLEN;
+	} else 
+		return NF_DROP;
+}
+
+
+static unsigned int 
+route6_gw(const struct ip6t_route_target_info *route_info,
+	  struct sk_buff *skb) 
+{
+	if (route6(skb, 0, route_info)) {
+		if (route_info->flags & IP6T_ROUTE_CONTINUE)
+			return IP6T_CONTINUE;
+
+		ip_direct_send(skb);
+		return NF_STOLEN;
+	} else
+		return NF_DROP;
+}
+
+
+static unsigned int 
+ip6t_route_target(struct sk_buff **pskb,
+		  const struct net_device *in,
+		  const struct net_device *out,
+		  unsigned int hooknum,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17)
+		  const struct xt_target *target,
+#endif
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
+		  const void *targinfo,
+		  void *userinfo)
+#else
+		  const void *targinfo)
+#endif
+{
+	const struct ip6t_route_target_info *route_info = targinfo;
+	struct sk_buff *skb = *pskb;
+	struct in6_addr *gw = (struct in6_addr*)&route_info->gw;
+	unsigned int res;
+
+	if (route_info->flags & IP6T_ROUTE_CONTINUE)
+		goto do_it;
+
+	/* If we are at PREROUTING or INPUT hook
+	 * the TTL isn't decreased by the IP stack
+	 */
+	if (hooknum == NF_IP6_PRE_ROUTING ||
+	    hooknum == NF_IP6_LOCAL_IN) {
+
+		struct ipv6hdr *ipv6h = skb->nh.ipv6h;
+
+		if (ipv6h->hop_limit <= 1) {
+			/* Force OUTPUT device used as source address */
+			skb->dev = skb->dst->dev;
+
+			icmpv6_send(skb, ICMPV6_TIME_EXCEED, 
+				    ICMPV6_EXC_HOPLIMIT, 0, skb->dev);
+
+			return NF_DROP;
+		}
+
+		ipv6h->hop_limit--;
+	}
+
+	if ((route_info->flags & IP6T_ROUTE_TEE)) {
+		/*
+		 * Copy the *pskb, and route the copy. Will later return
+		 * IP6T_CONTINUE for the original skb, which should continue
+		 * on its way as if nothing happened. The copy should be
+		 * independantly delivered to the ROUTE --gw.
+		 */
+		skb = skb_copy(*pskb, GFP_ATOMIC);
+		if (!skb) {
+			if (net_ratelimit()) 
+				DEBUGP(KERN_DEBUG "ip6t_ROUTE: copy failed!\n");
+			return IP6T_CONTINUE;
+		}
+	}
+
+do_it:
+	if (route_info->oif[0]) {
+		res = route6_oif(route_info, skb);
+	} else if (!ipv6_addr_any(gw)) {
+		res = route6_gw(route_info, skb);
+	} else {
+		if (net_ratelimit()) 
+			DEBUGP(KERN_DEBUG "ip6t_ROUTE: no parameter !\n");
+		res = IP6T_CONTINUE;
+	}
+
+	if ((route_info->flags & IP6T_ROUTE_TEE))
+		res = IP6T_CONTINUE;
+
+	return res;
+}
+
+
+static int 
+ip6t_route_checkentry(const char *tablename,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
+		      const void *entry,
+#else
+		      const struct ip6t_entry *entry
+#endif
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17)
+		      const struct xt_target *target,
+#endif
+		      void *targinfo,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
+		      unsigned int targinfosize,
+#endif
+		      unsigned int hook_mask)
+{
+	if (strcmp(tablename, "mangle") != 0) {
+		printk("ip6t_ROUTE: can only be called from \"mangle\" table.\n");
+		return 0;
+	}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
+	if (targinfosize != IP6T_ALIGN(sizeof(struct ip6t_route_target_info))) {
+		printk(KERN_WARNING "ip6t_ROUTE: targinfosize %u != %Zu\n",
+		       targinfosize,
+		       IP6T_ALIGN(sizeof(struct ip6t_route_target_info)));
+		return 0;
+	}
+#endif
+
+	return 1;
+}
+
+
+static struct ip6t_target ip6t_route_reg = {
+	.name       = "ROUTE",
+	.target     = ip6t_route_target,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17)
+	.targetsize = sizeof(struct ip6t_route_target_info),
+#endif
+	.checkentry = ip6t_route_checkentry,
+	.me         = THIS_MODULE
+};
+
+
+static int __init init(void)
+{
+	printk(KERN_DEBUG "registering ipv6 ROUTE target\n");
+	if (xt_register_target(&ip6t_route_reg))
+		return -EINVAL;
+
+	return 0;
+}
+
+
+static void __exit fini(void)
+{
+	xt_unregister_target(&ip6t_route_reg);
+}
+
+module_init(init);
+module_exit(fini);
+MODULE_LICENSE("GPL");
Index: linux-2.6.21.7/net/ipv6/netfilter/Kconfig
===================================================================
--- linux-2.6.21.7.orig/net/ipv6/netfilter/Kconfig
+++ linux-2.6.21.7/net/ipv6/netfilter/Kconfig
@@ -209,5 +209,18 @@ config IP6_NF_RAW
 	  If you want to compile it as a module, say M here and read
 	  <file:Documentation/modules.txt>.  If unsure, say `N'.
 
+config IP6_NF_TARGET_ROUTE
+	tristate 'ROUTE target support'
+	depends on IP6_NF_MANGLE
+	help
+	  This option adds a `ROUTE' target, which enables you to setup unusual
+	  routes. The ROUTE target is also able to change the incoming interface
+	  of a packet.
+	
+	  The target can be or not a final target. It has to be used inside the 
+	  mangle table.
+	  
+	  Not working as a module.
+
 endmenu