Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl
[linux-2.6.git] / net / ipv4 / tunnel4.c
index 8d30c48..59186ca 100644 (file)
@@ -8,15 +8,22 @@
 #include <linux/mutex.h>
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
+#include <linux/slab.h>
 #include <net/icmp.h>
 #include <net/ip.h>
 #include <net/protocol.h>
 #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)
+static inline struct xfrm_tunnel **fam_handlers(unsigned short family)
+{
+       return (family == AF_INET) ? &tunnel4_handlers : &tunnel64_handlers;
+}
+
+int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family)
 {
        struct xfrm_tunnel **pprev;
        int ret = -EEXIST;
@@ -24,7 +31,7 @@ int xfrm4_tunnel_register(struct xfrm_tunnel *handler)
 
        mutex_lock(&tunnel4_mutex);
 
-       for (pprev = &tunnel4_handlers; *pprev; pprev = &(*pprev)->next) {
+       for (pprev = fam_handlers(family); *pprev; pprev = &(*pprev)->next) {
                if ((*pprev)->priority > priority)
                        break;
                if ((*pprev)->priority == priority)
@@ -41,17 +48,16 @@ err:
 
        return ret;
 }
-
 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 = fam_handlers(family); *pprev; pprev = &(*pprev)->next) {
                if (*pprev == handler) {
                        *pprev = handler->next;
                        ret = 0;
@@ -65,7 +71,6 @@ int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler)
 
        return ret;
 }
-
 EXPORT_SYMBOL(xfrm4_tunnel_deregister);
 
 static int tunnel4_rcv(struct sk_buff *skb)
@@ -86,6 +91,26 @@ 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 ipv6hdr)))
+               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;
@@ -95,11 +120,32 @@ static void tunnel4_err(struct sk_buff *skb, u32 info)
                        break;
 }
 
-static struct net_protocol tunnel4_protocol = {
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+static void tunnel64_err(struct sk_buff *skb, u32 info)
+{
+       struct xfrm_tunnel *handler;
+
+       for (handler = tunnel64_handlers; handler; handler = handler->next)
+               if (!handler->err_handler(skb, info))
+                       break;
+}
+#endif
+
+static const struct net_protocol tunnel4_protocol = {
        .handler        =       tunnel4_rcv,
        .err_handler    =       tunnel4_err,
        .no_policy      =       1,
+       .netns_ok       =       1,
+};
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+static const struct net_protocol tunnel64_protocol = {
+       .handler        =       tunnel64_rcv,
+       .err_handler    =       tunnel64_err,
+       .no_policy      =       1,
+       .netns_ok       =       1,
 };
+#endif
 
 static int __init tunnel4_init(void)
 {
@@ -107,11 +153,22 @@ static int __init tunnel4_init(void)
                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");
 }