1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright 2011-2014 Autronica Fire and Security AS
5 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se
9 #include <linux/etherdevice.h>
10 #include <linux/if_arp.h>
11 #include <linux/if_vlan.h>
13 #include "hsr_device.h"
14 #include "hsr_forward.h"
15 #include "hsr_framereg.h"
17 static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
19 struct sk_buff *skb = *pskb;
20 struct hsr_port *port;
23 if (!skb_mac_header_was_set(skb)) {
24 WARN_ONCE(1, "%s: skb invalid", __func__);
25 return RX_HANDLER_PASS;
28 rcu_read_lock(); /* hsr->node_db, hsr->ports */
29 port = hsr_port_get_rcu(skb->dev);
33 if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) {
34 /* Directly kill frames sent by ourselves */
39 protocol = eth_hdr(skb)->h_proto;
40 if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR))
43 skb_push(skb, ETH_HLEN);
45 hsr_forward_skb(skb, port);
48 rcu_read_unlock(); /* hsr->node_db, hsr->ports */
49 return RX_HANDLER_CONSUMED;
52 rcu_read_unlock(); /* hsr->node_db, hsr->ports */
53 return RX_HANDLER_PASS;
56 bool hsr_port_exists(const struct net_device *dev)
58 return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame;
61 static int hsr_check_dev_ok(struct net_device *dev)
63 /* Don't allow HSR on non-ethernet like devices */
64 if ((dev->flags & IFF_LOOPBACK) || dev->type != ARPHRD_ETHER ||
65 dev->addr_len != ETH_ALEN) {
66 netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n");
70 /* Don't allow enslaving hsr devices */
71 if (is_hsr_master(dev)) {
72 netdev_info(dev, "Cannot create trees of HSR devices.\n");
76 if (hsr_port_exists(dev)) {
77 netdev_info(dev, "This device is already a HSR slave.\n");
81 if (is_vlan_dev(dev)) {
82 netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n");
86 if (dev->priv_flags & IFF_DONT_BRIDGE) {
87 netdev_info(dev, "This device does not support bridging.\n");
91 /* HSR over bonded devices has not been tested, but I'm not sure it
98 /* Setup device to be added to the HSR bridge. */
99 static int hsr_portdev_setup(struct net_device *dev, struct hsr_port *port)
104 res = dev_set_promiscuity(dev, 1);
106 goto fail_promiscuity;
109 * What does net device "adjacency" mean? Should we do
110 * res = netdev_master_upper_dev_link(port->dev, port->hsr->dev); ?
113 res = netdev_rx_handler_register(dev, hsr_handle_frame, port);
115 goto fail_rx_handler;
116 dev_disable_lro(dev);
121 dev_set_promiscuity(dev, -1);
128 int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev,
129 enum hsr_port_type type)
131 struct hsr_port *port, *master;
134 if (type != HSR_PT_MASTER) {
135 res = hsr_check_dev_ok(dev);
140 port = hsr_port_get_hsr(hsr, type);
142 return -EBUSY; /* This port already exists */
144 port = kzalloc(sizeof(*port), GFP_KERNEL);
148 if (type != HSR_PT_MASTER) {
149 res = hsr_portdev_setup(dev, port);
158 list_add_tail_rcu(&port->port_list, &hsr->ports);
161 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
162 netdev_update_features(master->dev);
163 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
172 void hsr_del_port(struct hsr_port *port)
174 struct hsr_priv *hsr;
175 struct hsr_port *master;
178 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
179 list_del_rcu(&port->port_list);
181 if (port != master) {
183 netdev_update_features(master->dev);
184 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
186 netdev_rx_handler_unregister(port->dev);
187 dev_set_promiscuity(port->dev, -1);
191 * netdev_upper_dev_unlink(port->dev, port->hsr->dev);