qlcnic: support anti mac spoofing

Administrator can configure to drop packet in transmit,
if it doesn't match interface mac address, in case of virtual function.

Signed-off-by: Sony Chacko <sony.chacko@qlogic.com>
Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/qlcnic/qlcnic.h

@@ -900,6 +900,7 @@ struct qlcnic_mac_req {
 #define QLCNIC_BRIDGE_ENABLED       	0X10
 #define QLCNIC_DIAG_ENABLED		0x20
 #define QLCNIC_ESWITCH_ENABLED		0x40
+#define QLCNIC_MACSPOOF			0x200
 #define QLCNIC_IS_MSI_FAMILY(adapter) \
 	((adapter)->flags & (QLCNIC_MSI_ENABLED | QLCNIC_MSIX_ENABLED))
 

drivers/net/qlcnic/qlcnic_main.c

@@ -762,6 +762,11 @@ static void
 qlcnic_set_eswitch_port_features(struct qlcnic_adapter *adapter,
 		struct qlcnic_esw_func_cfg *esw_cfg)
 {
+	adapter->flags &= ~QLCNIC_MACSPOOF;
+	if (adapter->op_mode == QLCNIC_NON_PRIV_FUNC)
+		if (esw_cfg->mac_anti_spoof)
+			adapter->flags |= QLCNIC_MACSPOOF;
+
 	qlcnic_set_netdev_features(adapter, esw_cfg);
 }
 
@@ -1912,6 +1917,12 @@ qlcnic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
 		return NETDEV_TX_BUSY;
 	}
 
+	if (adapter->flags & QLCNIC_MACSPOOF) {
+		if (compare_ether_addr(eth_hdr(skb)->h_source,
+					adapter->mac_addr))
+			goto drop_packet;
+	}
+
 	frag_count = skb_shinfo(skb)->nr_frags + 1;
 
 	/* 4 fragments per cmd des */