scsi: bnx2fc: Add filters to the non-offload FCoE receive path.

Add the following filters to bnx2fc_recv_frame():

1. Filter out invalid packets
    - eth->dest_mac[3] matches FC frame's D_ID
2. Filter out packets that are not from our connected target
    - In FIP_ST_ENABLED mode
    - eth->src_mac matches fcoe_ctlr->dest_addr
3. Filter out packets where if d_id of the packet doesn't belong to
   the device when one is already assigned a port_id, only then this
   packet is dropped
Signed-off-by: Chad Dupuis <chad.dupuis@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/bnx2fc/bnx2fc_fcoe.c

@@ -522,10 +522,12 @@ static void bnx2fc_recv_frame(struct sk_buff *skb)
 	struct fcoe_crc_eof crc_eof;
 	struct fc_frame *fp;
 	struct fc_lport *vn_port;
-	struct fcoe_port *port;
+	struct fcoe_port *port, *phys_port;
 	u8 *mac = NULL;
 	u8 *dest_mac = NULL;
 	struct fcoe_hdr *hp;
+	struct bnx2fc_interface *interface;
+	struct fcoe_ctlr *ctlr;
 
 	fr = fcoe_dev_from_skb(skb);
 	lport = fr->fr_dev;
@@ -561,8 +563,19 @@ static void bnx2fc_recv_frame(struct sk_buff *skb)
 		return;
 	}
 
+	phys_port = lport_priv(lport);
+	interface = phys_port->priv;
+	ctlr = bnx2fc_to_ctlr(interface);
+
 	fh = fc_frame_header_get(fp);
 
+	if (ntoh24(&dest_mac[3]) != ntoh24(fh->fh_d_id)) {
+		BNX2FC_HBA_DBG(lport, "FC frame d_id mismatch with MAC %pM.\n",
+		    dest_mac);
+		kfree_skb(skb);
+		return;
+	}
+
 	vn_port = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id));
 	if (vn_port) {
 		port = lport_priv(vn_port);
@@ -572,6 +585,14 @@ static void bnx2fc_recv_frame(struct sk_buff *skb)
 			return;
 		}
 	}
+	if (ctlr->state) {
+		if (!ether_addr_equal(mac, ctlr->dest_addr)) {
+			BNX2FC_HBA_DBG(lport, "Wrong source address: mac:%pM dest_addr:%pM.\n",
+			    mac, ctlr->dest_addr);
+			kfree_skb(skb);
+			return;
+		}
+	}
 	if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA &&
 	    fh->fh_type == FC_TYPE_FCP) {
 		/* Drop FCP data. We dont this in L2 path */
@@ -597,6 +618,18 @@ static void bnx2fc_recv_frame(struct sk_buff *skb)
 		return;
 	}
 
+	/*
+	 * If the destination ID from the frame header does not match what we
+	 * have on record for lport and the search for a NPIV port came up
+	 * empty then this is not addressed to our port so simply drop it.
+	 */
+	if (lport->port_id != ntoh24(fh->fh_d_id) && !vn_port) {
+		BNX2FC_HBA_DBG(lport, "Dropping frame due to destination mismatch: lport->port_id=%x fh->d_id=%x.\n",
+		    lport->port_id, ntoh24(fh->fh_d_id));
+		kfree_skb(skb);
+		return;
+	}
+
 	stats = per_cpu_ptr(lport->stats, smp_processor_id());
 	stats->RxFrames++;
 	stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;