[IPSEC]: Changing API of xfrm4_tunnel_register.

This patch changes xfrm4_tunnel register and deregister
interface to prepare for solving the conflict of device
tunnels with inter address family IPsec tunnel.

Signed-off-by: Kazunori MIYAZAWA <miyazawa@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 46 insertions, 4 deletions

diff --git a/net/ipv4/tunnel4.c b/net/ipv4/tunnel4.c
index 8d30c48f090e..a794a8ca8b4f 100644
--- a/net/ipv4/tunnel4.c
+++ b/net/ipv4/tunnel4.c
@@ -14,9 +14,10 @@
 #include <net/xfrm.h>
 
 static struct xfrm_tunnel *tunnel4_handlers;
+static struct xfrm_tunnel *tunnel64_handlers;
 static DEFINE_MUTEX(tunnel4_mutex);
 
-int xfrm4_tunnel_register(struct xfrm_tunnel *handler)
+int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family)
 {
         struct xfrm_tunnel **pprev;
         int ret = -EEXIST;
@@ -24,7 +25,8 @@ int xfrm4_tunnel_register(struct xfrm_tunnel *handler)
 
         mutex_lock(&tunnel4_mutex);
 
-        for (pprev = &tunnel4_handlers; *pprev; pprev = &(*pprev)->next) {
+        for (pprev = (family == AF_INET) ? &tunnel4_handlers : &tunnel64_handlers;
+             *pprev; pprev = &(*pprev)->next) {
                 if ((*pprev)->priority > priority)
                         break;
                 if ((*pprev)->priority == priority)
@@ -44,14 +46,15 @@ err:
 
 EXPORT_SYMBOL(xfrm4_tunnel_register);
 
-int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler)
+int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family)
 {
         struct xfrm_tunnel **pprev;
         int ret = -ENOENT;
 
         mutex_lock(&tunnel4_mutex);
 
-        for (pprev = &tunnel4_handlers; *pprev; pprev = &(*pprev)->next) {
+        for (pprev = (family == AF_INET) ? &tunnel4_handlers : &tunnel64_handlers;
+             *pprev; pprev = &(*pprev)->next) {
                 if (*pprev == handler) {
                         *pprev = handler->next;
                         ret = 0;
@@ -86,6 +89,26 @@ drop:
         return 0;
 }
 
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+static int tunnel64_rcv(struct sk_buff *skb)
+{
+        struct xfrm_tunnel *handler;
+
+        if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+                goto drop;
+
+        for (handler = tunnel64_handlers; handler; handler = handler->next)
+                if (!handler->handler(skb))
+                        return 0;
+
+        icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
+
+drop:
+        kfree_skb(skb);
+        return 0;
+}
+#endif
+
 static void tunnel4_err(struct sk_buff *skb, u32 info)
 {
         struct xfrm_tunnel *handler;
@@ -101,17 +124,36 @@ static struct net_protocol tunnel4_protocol = {
         .no_policy      =       1,
 };
 
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+static struct net_protocol tunnel64_protocol = {
+        .handler        =       tunnel64_rcv,
+        .err_handler    =       tunnel4_err,
+        .no_policy      =       1,
+};
+#endif
+
 static int __init tunnel4_init(void)
 {
         if (inet_add_protocol(&tunnel4_protocol, IPPROTO_IPIP)) {
                 printk(KERN_ERR "tunnel4 init: can't add protocol\n");
                 return -EAGAIN;
         }
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+        if (inet_add_protocol(&tunnel64_protocol, IPPROTO_IPV6)) {
+                printk(KERN_ERR "tunnel64 init: can't add protocol\n");
+                inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP);
+                return -EAGAIN;
+        }
+#endif
         return 0;
 }
 
 static void __exit tunnel4_fini(void)
 {
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+        if (inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6))
+                printk(KERN_ERR "tunnel64 close: can't remove protocol\n");
+#endif
         if (inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP))
                 printk(KERN_ERR "tunnel4 close: can't remove protocol\n");
 }