[NET]: Add macvlan driver

Add macvlan driver, which allows to create virtual ethernet devices
based on MAC address.

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

1 files changed, 26 insertions, 0 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 59ec811d2b54..13a0d9f6da54 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -98,6 +98,7 @@
 #include <linux/seq_file.h>
 #include <linux/stat.h>
 #include <linux/if_bridge.h>
+#include <linux/if_macvlan.h>
 #include <net/dst.h>
 #include <net/pkt_sched.h>
 #include <net/checksum.h>
@@ -1813,6 +1814,28 @@ static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
 #define handle_bridge(skb, pt_prev, ret, orig_dev)      (skb)
 #endif
 
+#if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
+struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
+EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
+
+static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
+                                             struct packet_type **pt_prev,
+                                             int *ret,
+                                             struct net_device *orig_dev)
+{
+        if (skb->dev->macvlan_port == NULL)
+                return skb;
+
+        if (*pt_prev) {
+                *ret = deliver_skb(skb, *pt_prev, orig_dev);
+                *pt_prev = NULL;
+        }
+        return macvlan_handle_frame_hook(skb);
+}
+#else
+#define handle_macvlan(skb, pt_prev, ret, orig_dev)     (skb)
+#endif
+
 #ifdef CONFIG_NET_CLS_ACT
 /* TODO: Maybe we should just force sch_ingress to be compiled in
  * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
@@ -1920,6 +1943,9 @@ ncls:
         skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
         if (!skb)
                 goto out;
+        skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
+        if (!skb)
+                goto out;
 
         type = skb->protocol;
         list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {