ipv6: Change skb->data before using icmpv6_notify() to propagate redirect

[deliverable/linux.git] / net / ipv6 / protocol.c

diff --git a/net/ipv6/protocol.c b/net/ipv6/protocol.c
index 053082dfc93e1f9d0c98e26e9c083fc384ed06d5..22d1bd4670dab741b2417051b45370b4a75b42a3 100644 (file)
--- a/net/ipv6/protocol.c
+++ b/net/ipv6/protocol.c
@@ -25,7 +25,9 @@
 #include <linux/spinlock.h>
 #include <net/protocol.h>
 
+#if IS_ENABLED(CONFIG_IPV6)
 const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
+EXPORT_SYMBOL(inet6_protos);
 
 int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
 {
@@ -50,3 +52,26 @@ int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol
        return ret;
 }
 EXPORT_SYMBOL(inet6_del_protocol);
+#endif
+
+const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;
+
+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);
+
+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);