Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 221 insertions, 0 deletions

diff --git a/net/hsr/hsr_slave.c b/net/hsr/hsr_slave.c
new file mode 100644
index 000000000..aecc05a28
--- /dev/null
+++ b/net/hsr/hsr_slave.c
@@ -0,0 +1,221 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright 2011-2014 Autronica Fire and Security AS
+ *
+ * Author(s):
+ *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
+ *
+ * Frame handler other utility functions for HSR and PRP.
+ */
+
+#include "hsr_slave.h"
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+#include <linux/if_vlan.h>
+#include "hsr_main.h"
+#include "hsr_device.h"
+#include "hsr_forward.h"
+#include "hsr_framereg.h"
+
+bool hsr_invalid_dan_ingress_frame(__be16 protocol)
+{
+	return (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR));
+}
+
+static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
+{
+	struct sk_buff *skb = *pskb;
+	struct hsr_port *port;
+	struct hsr_priv *hsr;
+	__be16 protocol;
+
+	/* Packets from dev_loopback_xmit() do not have L2 header, bail out */
+	if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
+		return RX_HANDLER_PASS;
+
+	if (!skb_mac_header_was_set(skb)) {
+		WARN_ONCE(1, "%s: skb invalid", __func__);
+		return RX_HANDLER_PASS;
+	}
+
+	port = hsr_port_get_rcu(skb->dev);
+	if (!port)
+		goto finish_pass;
+	hsr = port->hsr;
+
+	if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) {
+		/* Directly kill frames sent by ourselves */
+		kfree_skb(skb);
+		goto finish_consume;
+	}
+
+	/* For HSR, only tagged frames are expected, but for PRP
+	 * there could be non tagged frames as well from Single
+	 * attached nodes (SANs).
+	 */
+	protocol = eth_hdr(skb)->h_proto;
+	if (hsr->proto_ops->invalid_dan_ingress_frame &&
+	    hsr->proto_ops->invalid_dan_ingress_frame(protocol))
+		goto finish_pass;
+
+	skb_push(skb, ETH_HLEN);
+	skb_reset_mac_header(skb);
+	if ((!hsr->prot_version && protocol == htons(ETH_P_PRP)) ||
+	    protocol == htons(ETH_P_HSR))
+		skb_set_network_header(skb, ETH_HLEN + HSR_HLEN);
+	skb_reset_mac_len(skb);
+
+	hsr_forward_skb(skb, port);
+
+finish_consume:
+	return RX_HANDLER_CONSUMED;
+
+finish_pass:
+	return RX_HANDLER_PASS;
+}
+
+bool hsr_port_exists(const struct net_device *dev)
+{
+	return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame;
+}
+
+static int hsr_check_dev_ok(struct net_device *dev,
+			    struct netlink_ext_ack *extack)
+{
+	/* Don't allow HSR on non-ethernet like devices */
+	if ((dev->flags & IFF_LOOPBACK) || dev->type != ARPHRD_ETHER ||
+	    dev->addr_len != ETH_ALEN) {
+		NL_SET_ERR_MSG_MOD(extack, "Cannot use loopback or non-ethernet device as HSR slave.");
+		return -EINVAL;
+	}
+
+	/* Don't allow enslaving hsr devices */
+	if (is_hsr_master(dev)) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Cannot create trees of HSR devices.");
+		return -EINVAL;
+	}
+
+	if (hsr_port_exists(dev)) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "This device is already a HSR slave.");
+		return -EINVAL;
+	}
+
+	if (is_vlan_dev(dev)) {
+		NL_SET_ERR_MSG_MOD(extack, "HSR on top of VLAN is not yet supported in this driver.");
+		return -EINVAL;
+	}
+
+	if (dev->priv_flags & IFF_DONT_BRIDGE) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "This device does not support bridging.");
+		return -EOPNOTSUPP;
+	}
+
+	/* HSR over bonded devices has not been tested, but I'm not sure it
+	 * won't work...
+	 */
+
+	return 0;
+}
+
+/* Setup device to be added to the HSR bridge. */
+static int hsr_portdev_setup(struct hsr_priv *hsr, struct net_device *dev,
+			     struct hsr_port *port,
+			     struct netlink_ext_ack *extack)
+
+{
+	struct net_device *hsr_dev;
+	struct hsr_port *master;
+	int res;
+
+	res = dev_set_promiscuity(dev, 1);
+	if (res)
+		return res;
+
+	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
+	hsr_dev = master->dev;
+
+	res = netdev_upper_dev_link(dev, hsr_dev, extack);
+	if (res)
+		goto fail_upper_dev_link;
+
+	res = netdev_rx_handler_register(dev, hsr_handle_frame, port);
+	if (res)
+		goto fail_rx_handler;
+	dev_disable_lro(dev);
+
+	return 0;
+
+fail_rx_handler:
+	netdev_upper_dev_unlink(dev, hsr_dev);
+fail_upper_dev_link:
+	dev_set_promiscuity(dev, -1);
+	return res;
+}
+
+int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev,
+		 enum hsr_port_type type, struct netlink_ext_ack *extack)
+{
+	struct hsr_port *port, *master;
+	int res;
+
+	if (type != HSR_PT_MASTER) {
+		res = hsr_check_dev_ok(dev, extack);
+		if (res)
+			return res;
+	}
+
+	port = hsr_port_get_hsr(hsr, type);
+	if (port)
+		return -EBUSY;	/* This port already exists */
+
+	port = kzalloc(sizeof(*port), GFP_KERNEL);
+	if (!port)
+		return -ENOMEM;
+
+	port->hsr = hsr;
+	port->dev = dev;
+	port->type = type;
+
+	if (type != HSR_PT_MASTER) {
+		res = hsr_portdev_setup(hsr, dev, port, extack);
+		if (res)
+			goto fail_dev_setup;
+	}
+
+	list_add_tail_rcu(&port->port_list, &hsr->ports);
+	synchronize_rcu();
+
+	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
+	netdev_update_features(master->dev);
+	dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
+
+	return 0;
+
+fail_dev_setup:
+	kfree(port);
+	return res;
+}
+
+void hsr_del_port(struct hsr_port *port)
+{
+	struct hsr_priv *hsr;
+	struct hsr_port *master;
+
+	hsr = port->hsr;
+	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
+	list_del_rcu(&port->port_list);
+
+	if (port != master) {
+		netdev_update_features(master->dev);
+		dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
+		netdev_rx_handler_unregister(port->dev);
+		dev_set_promiscuity(port->dev, -1);
+		netdev_upper_dev_unlink(port->dev, master->dev);
+	}
+
+	synchronize_rcu();
+
+	kfree(port);
+}