1 files changed, 196 insertions, 0 deletions

diff --git a/net/hsr/hsr_slave.c b/net/hsr/hsr_slave.c
new file mode 100644
index 000000000000..a348dcbcd683
--- /dev/null
+++ b/net/hsr/hsr_slave.c
@@ -0,0 +1,196 @@
+/* Copyright 2011-2014 Autronica Fire and Security AS
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * Author(s):
+ *      2011-2014 Arvid Brodin, arvid.brodin@alten.se
+ */
+
+#include "hsr_slave.h"
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+#include "hsr_main.h"
+#include "hsr_device.h"
+#include "hsr_forward.h"
+#include "hsr_framereg.h"
+
+
+static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
+{
+        struct sk_buff *skb = *pskb;
+        struct hsr_port *port;
+
+        if (!skb_mac_header_was_set(skb)) {
+                WARN_ONCE(1, "%s: skb invalid", __func__);
+                return RX_HANDLER_PASS;
+        }
+
+        rcu_read_lock(); /* hsr->node_db, hsr->ports */
+        port = hsr_port_get_rcu(skb->dev);
+
+        if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) {
+                /* Directly kill frames sent by ourselves */
+                kfree_skb(skb);
+                goto finish_consume;
+        }
+
+        if (eth_hdr(skb)->h_proto != htons(ETH_P_PRP))
+                goto finish_pass;
+
+        skb_push(skb, ETH_HLEN);
+
+        hsr_forward_skb(skb, port);
+
+finish_consume:
+        rcu_read_unlock(); /* hsr->node_db, hsr->ports */
+        return RX_HANDLER_CONSUMED;
+
+finish_pass:
+        rcu_read_unlock(); /* hsr->node_db, hsr->ports */
+        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)
+{
+        /* Don't allow HSR on non-ethernet like devices */
+        if ((dev->flags & IFF_LOOPBACK) || (dev->type != ARPHRD_ETHER) ||
+            (dev->addr_len != ETH_ALEN)) {
+                netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n");
+                return -EINVAL;
+        }
+
+        /* Don't allow enslaving hsr devices */
+        if (is_hsr_master(dev)) {
+                netdev_info(dev, "Cannot create trees of HSR devices.\n");
+                return -EINVAL;
+        }
+
+        if (hsr_port_exists(dev)) {
+                netdev_info(dev, "This device is already a HSR slave.\n");
+                return -EINVAL;
+        }
+
+        if (dev->priv_flags & IFF_802_1Q_VLAN) {
+                netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n");
+                return -EINVAL;
+        }
+
+        if (dev->priv_flags & IFF_DONT_BRIDGE) {
+                netdev_info(dev, "This device does not support bridging.\n");
+                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 net_device *dev, struct hsr_port *port)
+{
+        int res;
+
+        dev_hold(dev);
+        res = dev_set_promiscuity(dev, 1);
+        if (res)
+                goto fail_promiscuity;
+
+        /* FIXME:
+         * What does net device "adjacency" mean? Should we do
+         * res = netdev_master_upper_dev_link(port->dev, port->hsr->dev); ?
+         */
+
+        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:
+        dev_set_promiscuity(dev, -1);
+fail_promiscuity:
+        dev_put(dev);
+
+        return res;
+}
+
+int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev,
+                 enum hsr_port_type type)
+{
+        struct hsr_port *port, *master;
+        int res;
+
+        if (type != HSR_PT_MASTER) {
+                res = hsr_check_dev_ok(dev);
+                if (res)
+                        return res;
+        }
+
+        port = hsr_port_get_hsr(hsr, type);
+        if (port != NULL)
+                return -EBUSY;  /* This port already exists */
+
+        port = kzalloc(sizeof(*port), GFP_KERNEL);
+        if (port == NULL)
+                return -ENOMEM;
+
+        if (type != HSR_PT_MASTER) {
+                res = hsr_portdev_setup(dev, port);
+                if (res)
+                        goto fail_dev_setup;
+        }
+
+        port->hsr = hsr;
+        port->dev = dev;
+        port->type = type;
+
+        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);
+        }
+
+        /* FIXME?
+         * netdev_upper_dev_unlink(port->dev, port->hsr->dev);
+         */
+
+        synchronize_rcu();
+        dev_put(port->dev);
+}