flow_dissector: introduce support for Ethernet addresses

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/flow_dissector.h

@@ -4,6 +4,7 @@
 #include <linux/types.h>
 #include <linux/skbuff.h>
 #include <linux/in6.h>
+#include <uapi/linux/if_ether.h>
 
 /**
  * struct flow_dissector_key_basic:
@@ -54,12 +55,24 @@ struct flow_dissector_key_ipv6_addrs {
 	struct in6_addr dst;
 };
 
+/**
+ * struct flow_dissector_key_eth_addrs:
+ * @src: source Ethernet address
+ * @dst: destination Ethernet address
+ */
+struct flow_dissector_key_eth_addrs {
+	/* (dst,src) must be grouped, in the same way than in ETH header */
+	unsigned char dst[ETH_ALEN];
+	unsigned char src[ETH_ALEN];
+};
+
 enum flow_dissector_key_id {
 	FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
 	FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_addrs */
 	FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS, /* struct flow_dissector_key_addrs */
 	FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
 	FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */
+	FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
 
 	FLOW_DISSECTOR_KEY_MAX,
 };

net/core/flow_dissector.c

@@ -14,6 +14,7 @@
 #include <linux/if_pppox.h>
 #include <linux/ppp_defs.h>
 #include <linux/stddef.h>
+#include <linux/if_ether.h>
 #include <net/flow_dissector.h>
 #include <scsi/fc/fc_fcoe.h>
 
@@ -138,6 +139,17 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
 					      FLOW_DISSECTOR_KEY_BASIC,
 					      target_container);
 
+	if (skb_flow_dissector_uses_key(flow_dissector,
+					FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
+		struct ethhdr *eth = eth_hdr(skb);
+		struct flow_dissector_key_eth_addrs *key_eth_addrs;
+
+		key_eth_addrs = skb_flow_dissector_target(flow_dissector,
+							  FLOW_DISSECTOR_KEY_ETH_ADDRS,
+							  target_container);
+		memcpy(key_eth_addrs, &eth->h_dest, sizeof(*key_eth_addrs));
+	}
+
 again:
 	switch (proto) {
 	case htons(ETH_P_IP): {