[PKT_SCHED]: Fix ingress qdisc to pick up IPv6 packets when using netfilter hooks.

Fixes the ingress qdisc to pick up IPv6 packets when using the old
style netfilter hooks, i.e. when CONFIG_NET_CLS_ACT is not enabled.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_ingress.c

@@ -14,6 +14,7 @@
 #include <linux/netdevice.h>
 #include <linux/rtnetlink.h>
 #include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv6.h>
 #include <linux/netfilter.h>
 #include <linux/smp.h>
 #include <net/pkt_sched.h>
@@ -271,6 +272,14 @@ static struct nf_hook_ops ing_ops = {
 	.priority       = NF_IP_PRI_FILTER + 1,
 };
 
+static struct nf_hook_ops ing6_ops = {
+	.hook           = ing_hook,
+	.owner		= THIS_MODULE,
+	.pf             = PF_INET6,
+	.hooknum        = NF_IP6_PRE_ROUTING,
+	.priority       = NF_IP6_PRI_FILTER + 1,
+};
+
 #endif
 #endif
 
@@ -297,6 +306,12 @@ static int ingress_init(struct Qdisc *sch,struct rtattr *opt)
 			return -EINVAL;
 		}
 		nf_registered++;
+
+		if (nf_register_hook(&ing6_ops) < 0) {
+			printk("IPv6 ingress qdisc registration error, " \
+			    "disabling IPv6 support.\n");
+		} else
+			nf_registered++;
 	}
 #endif
 #endif
@@ -408,8 +423,11 @@ static void __exit ingress_module_exit(void)
 	unregister_qdisc(&ingress_qdisc_ops);
 #ifndef CONFIG_NET_CLS_ACT
 #ifdef CONFIG_NETFILTER
-	if (nf_registered)
+	if (nf_registered) {
 		nf_unregister_hook(&ing_ops);
+		if (nf_registered > 1)
+			nf_unregister_hook(&ing6_ops);
+	}
 #endif
 #endif
 }