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);
31 if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) {
32 /* Directly kill frames sent by ourselves */
37 protocol = eth_hdr(skb)->h_proto;
38 if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR))
41 skb_push(skb, ETH_HLEN);
43 hsr_forward_skb(skb, port);
46 rcu_read_unlock(); /* hsr->node_db, hsr->ports */
47 return RX_HANDLER_CONSUMED;
50 rcu_read_unlock(); /* hsr->node_db, hsr->ports */
51 return RX_HANDLER_PASS;
54 bool hsr_port_exists(const struct net_device *dev)
56 return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame;
59 static int hsr_check_dev_ok(struct net_device *dev)
61 /* Don't allow HSR on non-ethernet like devices */
62 if ((dev->flags & IFF_LOOPBACK) || dev->type != ARPHRD_ETHER ||
63 dev->addr_len != ETH_ALEN) {
64 netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n");
68 /* Don't allow enslaving hsr devices */
69 if (is_hsr_master(dev)) {
70 netdev_info(dev, "Cannot create trees of HSR devices.\n");
74 if (hsr_port_exists(dev)) {
75 netdev_info(dev, "This device is already a HSR slave.\n");
79 if (is_vlan_dev(dev)) {
80 netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n");
84 if (dev->priv_flags & IFF_DONT_BRIDGE) {
85 netdev_info(dev, "This device does not support bridging.\n");
89 /* HSR over bonded devices has not been tested, but I'm not sure it
96 /* Setup device to be added to the HSR bridge. */
97 static int hsr_portdev_setup(struct net_device *dev, struct hsr_port *port)
102 res = dev_set_promiscuity(dev, 1);
104 goto fail_promiscuity;
107 * What does net device "adjacency" mean? Should we do
108 * res = netdev_master_upper_dev_link(port->dev, port->hsr->dev); ?
111 res = netdev_rx_handler_register(dev, hsr_handle_frame, port);
113 goto fail_rx_handler;
114 dev_disable_lro(dev);
119 dev_set_promiscuity(dev, -1);
126 int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev,
127 enum hsr_port_type type)
129 struct hsr_port *port, *master;
132 if (type != HSR_PT_MASTER) {
133 res = hsr_check_dev_ok(dev);
138 port = hsr_port_get_hsr(hsr, type);
140 return -EBUSY; /* This port already exists */
142 port = kzalloc(sizeof(*port), GFP_KERNEL);
146 if (type != HSR_PT_MASTER) {
147 res = hsr_portdev_setup(dev, port);
156 list_add_tail_rcu(&port->port_list, &hsr->ports);
159 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
160 netdev_update_features(master->dev);
161 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
170 void hsr_del_port(struct hsr_port *port)
172 struct hsr_priv *hsr;
173 struct hsr_port *master;
176 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
177 list_del_rcu(&port->port_list);
179 if (port != master) {
181 netdev_update_features(master->dev);
182 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
184 netdev_rx_handler_unregister(port->dev);
185 dev_set_promiscuity(port->dev, -1);
189 * netdev_upper_dev_unlink(port->dev, port->hsr->dev);