[NET]: Make ipip/ip6_tunnel independant of XFRM

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/xfrm.h

@@ -803,7 +803,7 @@ struct xfrm_algo_desc {
 /* XFRM tunnel handlers.  */
 struct xfrm_tunnel {
 	int (*handler)(struct sk_buff *skb);
-	void (*err_handler)(struct sk_buff *skb, void *info);
+	void (*err_handler)(struct sk_buff *skb, __u32 info);
 };
 
 struct xfrm6_tunnel {

net/ipv4/Kconfig

@@ -235,7 +235,6 @@ config IP_PNP_RARP
 #   bool '    IP: ARP support' CONFIG_IP_PNP_ARP		
 config NET_IPIP
 	tristate "IP: tunneling"
-	select INET_TUNNEL
 	---help---
 	  Tunneling means encapsulating data of one protocol type within
 	  another protocol and sending it over a channel that understands the

net/ipv4/ipip.c

@@ -273,7 +273,7 @@ static void ipip_tunnel_uninit(struct net_device *dev)
 	dev_put(dev);
 }
 
-static void ipip_err(struct sk_buff *skb, void *__unused)
+static void ipip_err(struct sk_buff *skb, u32 info)
 {
 #ifndef I_WISH_WORLD_WERE_PERFECT
 
@@ -852,11 +852,39 @@ static int __init ipip_fb_tunnel_init(struct net_device *dev)
 	return 0;
 }
 
+#ifdef CONFIG_INET_TUNNEL
 static struct xfrm_tunnel ipip_handler = {
 	.handler	=	ipip_rcv,
 	.err_handler	=	ipip_err,
 };
 
+static inline int ipip_register(void)
+{
+	return xfrm4_tunnel_register(&ipip_handler);
+}
+
+static inline int ipip_unregister(void)
+{
+	return xfrm4_tunnel_deregister(&ipip_handler);
+}
+#else
+static struct net_protocol ipip_protocol = {
+	.handler	=	ipip_rcv,
+	.err_handler	=	ipip_err,
+	.no_policy	=	1,
+};
+
+static inline int ipip_register(void)
+{
+	return inet_add_protocol(&ipip_protocol, IPPROTO_IPIP);
+}
+
+static inline int ipip_unregister(void)
+{
+	return inet_del_protocol(&ipip_protocol, IPPROTO_IPIP);
+}
+#endif
+
 static char banner[] __initdata =
 	KERN_INFO "IPv4 over IPv4 tunneling driver\n";
 
@@ -866,7 +894,7 @@ static int __init ipip_init(void)
 
 	printk(banner);
 
-	if (xfrm4_tunnel_register(&ipip_handler) < 0) {
+	if (ipip_register() < 0) {
 		printk(KERN_INFO "ipip init: can't register tunnel\n");
 		return -EAGAIN;
 	}
@@ -888,13 +916,13 @@ static int __init ipip_init(void)
  err2:
 	free_netdev(ipip_fb_tunnel_dev);
  err1:
-	xfrm4_tunnel_deregister(&ipip_handler);
+	ipip_unregister();
 	goto out;
 }
 
 static void __exit ipip_fini(void)
 {
-	if (xfrm4_tunnel_deregister(&ipip_handler) < 0)
+	if (ipip_unregister() < 0)
 		printk(KERN_INFO "ipip close: can't deregister tunnel\n");
 
 	unregister_netdev(ipip_fb_tunnel_dev);

net/ipv4/xfrm4_tunnel.c

@@ -78,10 +78,9 @@ static int ipip_rcv(struct sk_buff *skb)
 static void ipip_err(struct sk_buff *skb, u32 info)
 {
 	struct xfrm_tunnel *handler = ipip_handler;
-	u32 arg = info;
 
 	if (handler)
-		handler->err_handler(skb, &arg);
+		handler->err_handler(skb, info);
 }
 
 static int ipip_init_state(struct xfrm_state *x)

net/ipv6/Kconfig

@@ -91,7 +91,6 @@ config INET6_TUNNEL
 config IPV6_TUNNEL
 	tristate "IPv6: IPv6-in-IPv6 tunnel"
 	depends on IPV6
-	select INET6_TUNNEL
 	---help---
 	  Support for IPv6-in-IPv6 tunnels described in RFC 2473.
 

net/ipv6/ip6_tunnel.c

@@ -1110,11 +1110,39 @@ ip6ip6_fb_tnl_dev_init(struct net_device *dev)
 	return 0;
 }
 
+#ifdef CONFIG_INET6_TUNNEL
 static struct xfrm6_tunnel ip6ip6_handler = {
-	.handler = ip6ip6_rcv,
+	.handler	= ip6ip6_rcv,
-	.err_handler = ip6ip6_err,
+	.err_handler	= ip6ip6_err,
 };
 
+static inline int ip6ip6_register(void)
+{
+	return xfrm6_tunnel_register(&ip6ip6_handler);
+}
+
+static inline int ip6ip6_unregister(void)
+{
+	return xfrm6_tunnel_unregister(&ip6ip6_handler);
+}
+#else
+static struct inet6_protocol xfrm6_tunnel_protocol = {
+	.handler	= ip6ip6_rcv,
+	.err_handler	= ip6ip6_err,
+	.flags		= INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
+};
+
+static inline int ip6ip6_register(void)
+{
+	return inet6_add_protocol(&xfrm6_tunnel_protocol, IPPROTO_IPV6);
+}
+
+static inline int ip6ip6_unregister(void)
+{
+	return inet6_del_protocol(&xfrm6_tunnel_protocol, IPPROTO_IPV6);
+}
+#endif
+
 /**
  * ip6_tunnel_init - register protocol and reserve needed resources
  *
@@ -1125,7 +1153,7 @@ static int __init ip6_tunnel_init(void)
 {
 	int  err;
 
-	if (xfrm6_tunnel_register(&ip6ip6_handler) < 0) {
+	if (ip6ip6_register() < 0) {
 		printk(KERN_ERR "ip6ip6 init: can't register tunnel\n");
 		return -EAGAIN;
 	}
@@ -1144,7 +1172,7 @@ static int __init ip6_tunnel_init(void)
 	}
 	return 0;
 fail:
-	xfrm6_tunnel_deregister(&ip6ip6_handler);
+	ip6ip6_unregister();
 	return err;
 }
 
@@ -1154,7 +1182,7 @@ fail:
 
 static void __exit ip6_tunnel_cleanup(void)
 {
-	if (xfrm6_tunnel_deregister(&ip6ip6_handler) < 0)
+	if (ip6ip6_unregister() < 0)
 		printk(KERN_INFO "ip6ip6 close: can't deregister tunnel\n");
 
 	unregister_netdev(ip6ip6_fb_tnl_dev);