ipv6: Add new offload registration infrastructure.

[~andy/linux] / net / ipv6 / protocol.c

diff --git a/net/ipv6/protocol.c b/net/ipv6/protocol.c
index 053082dfc93e1f9d0c98e26e9c083fc384ed06d5..f7c53a7d5cb05c3f3e0a892f15922db687fc80aa 100644 (file)
--- a/net/ipv6/protocol.c
+++ b/net/ipv6/protocol.c
@@ -26,6 +26,7 @@
 #include <net/protocol.h>
 
 const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
+const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;
 
 int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
 {
@@ -34,6 +35,13 @@ int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol
 }
 EXPORT_SYMBOL(inet6_add_protocol);
 
+int inet6_add_offload(const struct net_offload *prot, unsigned char protocol)
+{
+       return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
+                       NULL, prot) ? 0 : -1;
+}
+EXPORT_SYMBOL(inet6_add_offload);
+
 /*
  *     Remove a protocol from the hash tables.
  */
@@ -50,3 +58,16 @@ int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol
        return ret;
 }
 EXPORT_SYMBOL(inet6_del_protocol);
+
+int inet6_del_offload(const struct net_offload *prot, unsigned char protocol)
+{
+       int ret;
+
+       ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
+                      prot, NULL) == prot) ? 0 : -1;
+
+       synchronize_net();
+
+       return ret;
+}
+EXPORT_SYMBOL(inet6_del_offload);