--- zzzz-none-000/linux-4.4.271/net/packet/af_packet.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/net/packet/af_packet.c	2023-04-19 10:22:30.000000000 +0000
@@ -1703,7 +1703,7 @@
 		match->flags = flags;
 		INIT_LIST_HEAD(&match->list);
 		spin_lock_init(&match->lock);
-		atomic_set(&match->sk_ref, 0);
+		refcount_set(&match->sk_ref, 0);
 		fanout_init_data(match);
 		match->prot_hook.type = po->prot_hook.type;
 		match->prot_hook.dev = po->prot_hook.dev;
@@ -1720,19 +1720,19 @@
 	    match->prot_hook.type == po->prot_hook.type &&
 	    match->prot_hook.dev == po->prot_hook.dev) {
 		err = -ENOSPC;
-		if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
+		if (refcount_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
 			__dev_remove_pack(&po->prot_hook);
 			po->fanout = match;
 			po->rollover = rollover;
 			rollover = NULL;
-			atomic_inc(&match->sk_ref);
+			refcount_set(&match->sk_ref, refcount_read(&match->sk_ref) + 1);
 			__fanout_link(sk, po);
 			err = 0;
 		}
 	}
 	spin_unlock(&po->bind_lock);
 
-	if (err && !atomic_read(&match->sk_ref)) {
+	if (err && !refcount_read(&match->sk_ref)) {
 		list_del(&match->list);
 		kfree(match);
 	}
@@ -1758,7 +1758,7 @@
 	if (f) {
 		po->fanout = NULL;
 
-		if (atomic_dec_and_test(&f->sk_ref))
+		if (refcount_dec_and_test(&f->sk_ref))
 			list_del(&f->list);
 		else
 			f = NULL;
@@ -1791,6 +1791,7 @@
 {
 	struct sock *sk;
 	struct sockaddr_pkt *spkt;
+	struct packet_sock *po;
 
 	/*
 	 *	When we registered the protocol we saved the socket in the data
@@ -1798,6 +1799,7 @@
 	 */
 
 	sk = pt->af_packet_priv;
+	po = pkt_sk(sk);
 
 	/*
 	 *	Yank back the headers [hope the device set this
@@ -1810,7 +1812,7 @@
 	 *	so that this procedure is noop.
 	 */
 
-	if (skb->pkt_type == PACKET_LOOPBACK)
+	if (!(po->pkt_type & (1 << skb->pkt_type)))
 		goto out;
 
 	if (!net_eq(dev_net(dev), sock_net(sk)))
@@ -2013,12 +2015,12 @@
 	int skb_len = skb->len;
 	unsigned int snaplen, res;
 
-	if (skb->pkt_type == PACKET_LOOPBACK)
-		goto drop;
-
 	sk = pt->af_packet_priv;
 	po = pkt_sk(sk);
 
+	if (!(po->pkt_type & (1 << skb->pkt_type)))
+		goto drop;
+
 	if (!net_eq(dev_net(dev), sock_net(sk)))
 		goto drop;
 
@@ -2138,12 +2140,12 @@
 	BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
 	BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
 
-	if (skb->pkt_type == PACKET_LOOPBACK)
-		goto drop;
-
 	sk = pt->af_packet_priv;
 	po = pkt_sk(sk);
 
+	if (!(po->pkt_type & (1 << skb->pkt_type)))
+		goto drop;
+
 	if (!net_eq(dev_net(dev), sock_net(sk)))
 		goto drop;
 
@@ -3162,6 +3164,7 @@
 	mutex_init(&po->pg_vec_lock);
 	po->rollover = NULL;
 	po->prot_hook.func = packet_rcv;
+	po->pkt_type = PACKET_MASK_ANY & ~(1 << PACKET_LOOPBACK);
 
 	if (sock->type == SOCK_PACKET)
 		po->prot_hook.func = packet_rcv_spkt;
@@ -3829,6 +3832,16 @@
 		po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
 		return 0;
 	}
+        case PACKET_RECV_TYPE:
+        {
+                unsigned int val;
+                if (optlen != sizeof(val))
+                        return -EINVAL;
+                if (copy_from_user(&val, optval, sizeof(val)))
+                        return -EFAULT;
+                po->pkt_type = val & ~BIT(PACKET_LOOPBACK);
+                return 0;
+        }
 	default:
 		return -ENOPROTOOPT;
 	}
@@ -3881,6 +3894,13 @@
 	case PACKET_VNET_HDR:
 		val = po->has_vnet_hdr;
 		break;
+	case PACKET_RECV_TYPE:
+		if (len > sizeof(unsigned int))
+			len = sizeof(unsigned int);
+		val = po->pkt_type;
+
+		data = &val;
+		break;
 	case PACKET_VERSION:
 		val = po->tp_version;
 		break;