1 files changed, 25 insertions, 7 deletions

diff --git a/drivers/net/netkit.c b/drivers/net/netkit.c
index 39171380cc..16789cd446 100644
--- a/drivers/net/netkit.c
+++ b/drivers/net/netkit.c
@@ -55,6 +55,7 @@ static void netkit_prep_forward(struct sk_buff *skb, bool xnet)
 	skb_scrub_packet(skb, xnet);
 	skb->priority = 0;
 	nf_skip_egress(skb, true);
+	skb_reset_mac_header(skb);
 }
 
 static struct netkit *netkit_priv(const struct net_device *dev)
@@ -78,6 +79,7 @@ static netdev_tx_t netkit_xmit(struct sk_buff *skb, struct net_device *dev)
 		     skb_orphan_frags(skb, GFP_ATOMIC)))
 		goto drop;
 	netkit_prep_forward(skb, !net_eq(dev_net(dev), dev_net(peer)));
+	eth_skb_pkt_type(skb, peer);
 	skb->dev = peer;
 	entry = rcu_dereference(nk->active);
 	if (entry)
@@ -85,7 +87,7 @@ static netdev_tx_t netkit_xmit(struct sk_buff *skb, struct net_device *dev)
 	switch (ret) {
 	case NETKIT_NEXT:
 	case NETKIT_PASS:
-		skb->protocol = eth_type_trans(skb, skb->dev);
+		eth_skb_pull_mac(skb);
 		skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 		if (likely(__netif_rx(skb) == NET_RX_SUCCESS)) {
 			dev_sw_netstats_tx_add(dev, 1, len);
@@ -145,7 +147,7 @@ static int netkit_get_iflink(const struct net_device *dev)
 	rcu_read_lock();
 	peer = rcu_dereference(nk->peer);
 	if (peer)
-		iflink = peer->ifindex;
+		iflink = READ_ONCE(peer->ifindex);
 	rcu_read_unlock();
 	return iflink;
 }
@@ -155,6 +157,16 @@ static void netkit_set_multicast(struct net_device *dev)
 	/* Nothing to do, we receive whatever gets pushed to us! */
 }
 
+static int netkit_set_macaddr(struct net_device *dev, void *sa)
+{
+	struct netkit *nk = netkit_priv(dev);
+
+	if (nk->mode != NETKIT_L2)
+		return -EOPNOTSUPP;
+
+	return eth_mac_addr(dev, sa);
+}
+
 static void netkit_set_headroom(struct net_device *dev, int headroom)
 {
 	struct netkit *nk = netkit_priv(dev), *nk2;
@@ -198,6 +210,7 @@ static const struct net_device_ops netkit_netdev_ops = {
 	.ndo_start_xmit		= netkit_xmit,
 	.ndo_set_rx_mode	= netkit_set_multicast,
 	.ndo_set_rx_headroom	= netkit_set_headroom,
+	.ndo_set_mac_address	= netkit_set_macaddr,
 	.ndo_get_iflink		= netkit_get_iflink,
 	.ndo_get_peer_dev	= netkit_peer_dev,
 	.ndo_get_stats64	= netkit_get_stats,
@@ -300,9 +313,11 @@ static int netkit_validate(struct nlattr *tb[], struct nlattr *data[],
 
 	if (!attr)
 		return 0;
-	NL_SET_ERR_MSG_ATTR(extack, attr,
-			    "Setting Ethernet address is not supported");
-	return -EOPNOTSUPP;
+	if (nla_len(attr) != ETH_ALEN)
+		return -EINVAL;
+	if (!is_valid_ether_addr(nla_data(attr)))
+		return -EADDRNOTAVAIL;
+	return 0;
 }
 
 static struct rtnl_link_ops netkit_link_ops;
@@ -365,6 +380,9 @@ static int netkit_new_link(struct net *src_net, struct net_device *dev,
 		strscpy(ifname, "nk%d", IFNAMSIZ);
 		ifname_assign_type = NET_NAME_ENUM;
 	}
+	if (mode != NETKIT_L2 &&
+	    (tb[IFLA_ADDRESS] || tbp[IFLA_ADDRESS]))
+		return -EOPNOTSUPP;
 
 	net = rtnl_link_get_net(src_net, tbp);
 	if (IS_ERR(net))
@@ -379,7 +397,7 @@ static int netkit_new_link(struct net *src_net, struct net_device *dev,
 
 	netif_inherit_tso_max(peer, dev);
 
-	if (mode == NETKIT_L2)
+	if (mode == NETKIT_L2 && !(ifmp && tbp[IFLA_ADDRESS]))
 		eth_hw_addr_random(peer);
 	if (ifmp && dev->ifindex)
 		peer->ifindex = ifmp->ifi_index;
@@ -402,7 +420,7 @@ static int netkit_new_link(struct net *src_net, struct net_device *dev,
 	if (err < 0)
 		goto err_configure_peer;
 
-	if (mode == NETKIT_L2)
+	if (mode == NETKIT_L2 && !tb[IFLA_ADDRESS])
 		eth_hw_addr_random(dev);
 	if (tb[IFLA_IFNAME])
 		nla_strscpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);