[NETFILTER]: Move reroute-after-queue code up to the nf_queue layer.

The rerouting functionality is required by the core, therefore it has
to be implemented by the core and not in individual queue handlers.

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 69 insertions, 24 deletions

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 28d9bca..5740473 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -44,6 +44,7 @@
 #include <linux/netdevice.h>
 #include <linux/icmpv6.h>
 #include <linux/smp_lock.h>
+#include <linux/netfilter_ipv6.h>
 
 #include <net/ip.h>
 #include <net/ipv6.h>
@@ -757,6 +758,9 @@ static int __init inet6_init(void)
 	err = igmp6_init(&inet6_family_ops);
 	if (err)
 		goto igmp_fail;
+	err = ipv6_netfilter_init();
+	if (err)
+		goto netfilter_fail;
 	/* Create /proc/foo6 entries. */
 #ifdef CONFIG_PROC_FS
 	err = -ENOMEM;
@@ -813,6 +817,8 @@ proc_tcp6_fail:
 	raw6_proc_exit();
 proc_raw6_fail:
 #endif
+	ipv6_netfilter_fini();
+netfilter_fail:
 	igmp6_cleanup();
 igmp_fail:
 	ndisc_cleanup();
@@ -852,6 +858,7 @@ static void __exit inet6_exit(void)
 	ip6_route_cleanup();
 	ipv6_packet_cleanup();
 	igmp6_cleanup();
+	ipv6_netfilter_fini();
 	ndisc_cleanup();
 	icmpv6_cleanup();
 #ifdef CONFIG_SYSCTL
diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c
index 5656d09..c8daef9 100644
--- a/net/ipv6/netfilter.c
+++ b/net/ipv6/netfilter.c
@@ -5,6 +5,8 @@
 
 #include <linux/kernel.h>
 #include <linux/ipv6.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
 #include <net/dst.h>
 #include <net/ipv6.h>
 #include <net/ip6_route.h>
@@ -40,4 +42,64 @@ int ip6_route_me_harder(struct sk_buff *skb)
 }
 EXPORT_SYMBOL(ip6_route_me_harder);
 
+/*
+ * Extra routing may needed on local out, as the QUEUE target never
+ * returns control to the table.
+ */
+
+struct ip6_rt_info {
+	struct in6_addr daddr;
+	struct in6_addr saddr;
+};
+
+static void save(const struct sk_buff *skb, struct nf_info *info)
+{
+	struct ip6_rt_info *rt_info = nf_info_reroute(info);
+
+	if (info->hook == NF_IP6_LOCAL_OUT) {
+		struct ipv6hdr *iph = skb->nh.ipv6h;
+
+		rt_info->daddr = iph->daddr;
+		rt_info->saddr = iph->saddr;
+	}
+}
+
+static int reroute(struct sk_buff **pskb, const struct nf_info *info)
+{
+	struct ip6_rt_info *rt_info = nf_info_reroute(info);
+
+	if (info->hook == NF_IP6_LOCAL_OUT) {
+		struct ipv6hdr *iph = (*pskb)->nh.ipv6h;
+		if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
+		    !ipv6_addr_equal(&iph->saddr, &rt_info->saddr))
+			return ip6_route_me_harder(*pskb);
+	}
+	return 0;
+}
+
+static struct nf_queue_rerouter ip6_reroute = {
+	.rer_size	= sizeof(struct ip6_rt_info),
+	.save 		= &save,
+	.reroute	= &reroute,
+};
+
+int __init ipv6_netfilter_init(void)
+{
+	return nf_register_queue_rerouter(PF_INET6, &ip6_reroute);
+}
+
+void ipv6_netfilter_fini(void)
+{
+	nf_unregister_queue_rerouter(PF_INET6);
+}
+
+#else /* CONFIG_NETFILTER */
+int __init ipv6_netfilter_init(void)
+{
+	return 0;
+}
+
+void ipv6_netfilter_fini(void)
+{
+}
 #endif /* CONFIG_NETFILTER */
diff --git a/net/ipv6/netfilter/ip6_queue.c b/net/ipv6/netfilter/ip6_queue.c
index 1c3d247..c45d8f8 100644
--- a/net/ipv6/netfilter/ip6_queue.c
+++ b/net/ipv6/netfilter/ip6_queue.c
@@ -47,16 +47,10 @@
 #define NET_IPQ_QMAX 2088
 #define NET_IPQ_QMAX_NAME "ip6_queue_maxlen"
 
-struct ipq_rt_info {
-	struct in6_addr daddr;
-	struct in6_addr saddr;
-};
-
 struct ipq_queue_entry {
 	struct list_head list;
 	struct nf_info *info;
 	struct sk_buff *skb;
-	struct ipq_rt_info rt_info;
 };
 
 typedef int (*ipq_cmpfn)(struct ipq_queue_entry *, unsigned long);
@@ -302,13 +296,6 @@ ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info, void *data)
 	entry->info = info;
 	entry->skb = skb;
 
-	if (entry->info->hook == NF_IP_LOCAL_OUT) {
-		struct ipv6hdr *iph = skb->nh.ipv6h;
-
-		entry->rt_info.daddr = iph->daddr;
-		entry->rt_info.saddr = iph->saddr;
-	}
-
 	nskb = ipq_build_packet_message(entry, &status);
 	if (nskb == NULL)
 		goto err_out_free;
@@ -389,17 +376,6 @@ ipq_mangle_ipv6(ipq_verdict_msg_t *v, struct ipq_queue_entry *e)
 	memcpy(e->skb->data, v->payload, v->data_len);
 	e->skb->ip_summed = CHECKSUM_NONE;
 
-	/*
-	 * Extra routing may needed on local out, as the QUEUE target never
-	 * returns control to the table.
-         * Not a nice way to cmp, but works
-	 */
-	if (e->info->hook == NF_IP_LOCAL_OUT) {
-		struct ipv6hdr *iph = e->skb->nh.ipv6h;
-		if (!ipv6_addr_equal(&iph->daddr, &e->rt_info.daddr) ||
-		    !ipv6_addr_equal(&iph->saddr, &e->rt_info.saddr))
-			return ip6_route_me_harder(e->skb);
-	}
 	return 0;
 }