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-rw-r--r--net/hsr/hsr_slave.c230
1 files changed, 230 insertions, 0 deletions
diff --git a/net/hsr/hsr_slave.c b/net/hsr/hsr_slave.c
new file mode 100644
index 0000000000..e5742f2a2d
--- /dev/null
+++ b/net/hsr/hsr_slave.c
@@ -0,0 +1,230 @@
+// 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 (unless the device offloads
+ * HSR tag removal), but for PRP there could be non tagged frames as
+ * well from Single attached nodes (SANs).
+ */
+ protocol = eth_hdr(skb)->h_proto;
+
+ if (!(port->dev->features & NETIF_F_HW_HSR_TAG_RM) &&
+ 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;
+
+ /* Don't use promiscuous mode for offload since L2 frame forward
+ * happens at the offloaded hardware.
+ */
+ if (!port->hsr->fwd_offloaded) {
+ 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:
+ if (!port->hsr->fwd_offloaded)
+ 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);
+}