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Arvid Brodin81ba6af2014-07-04 23:35:24 +02001/* Copyright 2011-2014 Autronica Fire and Security AS
2 *
3 * This program is free software; you can redistribute it and/or modify it
4 * under the terms of the GNU General Public License as published by the Free
5 * Software Foundation; either version 2 of the License, or (at your option)
6 * any later version.
7 *
8 * Author(s):
9 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se
10 */
11
12#include "hsr_slave.h"
13#include <linux/etherdevice.h>
Arvid Brodin51f3c602014-07-04 23:37:27 +020014#include <linux/if_arp.h>
Arvid Brodin81ba6af2014-07-04 23:35:24 +020015#include "hsr_main.h"
Arvid Brodin51f3c602014-07-04 23:37:27 +020016#include "hsr_device.h"
Arvid Brodinf266a682014-07-04 23:41:03 +020017#include "hsr_forward.h"
Arvid Brodin81ba6af2014-07-04 23:35:24 +020018#include "hsr_framereg.h"
19
20
Arvid Brodinf266a682014-07-04 23:41:03 +020021static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
22{
23 struct sk_buff *skb = *pskb;
24 struct hsr_port *port;
Peter Heiseee1c2792016-04-13 13:52:22 +020025 u16 protocol;
Arvid Brodinf266a682014-07-04 23:41:03 +020026
27 if (!skb_mac_header_was_set(skb)) {
28 WARN_ONCE(1, "%s: skb invalid", __func__);
29 return RX_HANDLER_PASS;
30 }
31
32 rcu_read_lock(); /* hsr->node_db, hsr->ports */
33 port = hsr_port_get_rcu(skb->dev);
34
35 if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) {
36 /* Directly kill frames sent by ourselves */
37 kfree_skb(skb);
38 goto finish_consume;
39 }
40
Peter Heiseee1c2792016-04-13 13:52:22 +020041 protocol = eth_hdr(skb)->h_proto;
42 if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR))
Arvid Brodinf266a682014-07-04 23:41:03 +020043 goto finish_pass;
44
45 skb_push(skb, ETH_HLEN);
46
47 hsr_forward_skb(skb, port);
48
49finish_consume:
50 rcu_read_unlock(); /* hsr->node_db, hsr->ports */
51 return RX_HANDLER_CONSUMED;
52
53finish_pass:
54 rcu_read_unlock(); /* hsr->node_db, hsr->ports */
55 return RX_HANDLER_PASS;
56}
57
58bool hsr_port_exists(const struct net_device *dev)
59{
60 return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame;
61}
62
63
Arvid Brodinc5a75912014-07-04 23:38:05 +020064static int hsr_check_dev_ok(struct net_device *dev)
Arvid Brodin51f3c602014-07-04 23:37:27 +020065{
66 /* Don't allow HSR on non-ethernet like devices */
67 if ((dev->flags & IFF_LOOPBACK) || (dev->type != ARPHRD_ETHER) ||
68 (dev->addr_len != ETH_ALEN)) {
69 netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n");
70 return -EINVAL;
71 }
72
73 /* Don't allow enslaving hsr devices */
74 if (is_hsr_master(dev)) {
75 netdev_info(dev, "Cannot create trees of HSR devices.\n");
76 return -EINVAL;
77 }
78
Arvid Brodinc5a75912014-07-04 23:38:05 +020079 if (hsr_port_exists(dev)) {
Arvid Brodin51f3c602014-07-04 23:37:27 +020080 netdev_info(dev, "This device is already a HSR slave.\n");
81 return -EINVAL;
82 }
83
84 if (dev->priv_flags & IFF_802_1Q_VLAN) {
85 netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n");
86 return -EINVAL;
87 }
88
Arvid Brodinf266a682014-07-04 23:41:03 +020089 if (dev->priv_flags & IFF_DONT_BRIDGE) {
90 netdev_info(dev, "This device does not support bridging.\n");
91 return -EOPNOTSUPP;
92 }
93
Arvid Brodin51f3c602014-07-04 23:37:27 +020094 /* HSR over bonded devices has not been tested, but I'm not sure it
95 * won't work...
96 */
97
98 return 0;
99}
100
101
Arvid Brodinc5a75912014-07-04 23:38:05 +0200102/* Setup device to be added to the HSR bridge. */
103static int hsr_portdev_setup(struct net_device *dev, struct hsr_port *port)
Arvid Brodin51f3c602014-07-04 23:37:27 +0200104{
105 int res;
106
107 dev_hold(dev);
Arvid Brodin51f3c602014-07-04 23:37:27 +0200108 res = dev_set_promiscuity(dev, 1);
109 if (res)
Arvid Brodinc5a75912014-07-04 23:38:05 +0200110 goto fail_promiscuity;
Arvid Brodin51f3c602014-07-04 23:37:27 +0200111
Arvid Brodinc5a75912014-07-04 23:38:05 +0200112 /* FIXME:
113 * What does net device "adjacency" mean? Should we do
114 * res = netdev_master_upper_dev_link(port->dev, port->hsr->dev); ?
115 */
Arvid Brodin51f3c602014-07-04 23:37:27 +0200116
Arvid Brodinf266a682014-07-04 23:41:03 +0200117 res = netdev_rx_handler_register(dev, hsr_handle_frame, port);
118 if (res)
119 goto fail_rx_handler;
120 dev_disable_lro(dev);
121
Arvid Brodin51f3c602014-07-04 23:37:27 +0200122 return 0;
123
124fail_rx_handler:
125 dev_set_promiscuity(dev, -1);
Arvid Brodinc5a75912014-07-04 23:38:05 +0200126fail_promiscuity:
Arvid Brodin51f3c602014-07-04 23:37:27 +0200127 dev_put(dev);
Arvid Brodinc5a75912014-07-04 23:38:05 +0200128
Arvid Brodin51f3c602014-07-04 23:37:27 +0200129 return res;
130}
131
Arvid Brodinc5a75912014-07-04 23:38:05 +0200132int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev,
133 enum hsr_port_type type)
Arvid Brodin51f3c602014-07-04 23:37:27 +0200134{
Arvid Brodinc5a75912014-07-04 23:38:05 +0200135 struct hsr_port *port, *master;
136 int res;
Arvid Brodin51f3c602014-07-04 23:37:27 +0200137
Arvid Brodinc5a75912014-07-04 23:38:05 +0200138 if (type != HSR_PT_MASTER) {
139 res = hsr_check_dev_ok(dev);
140 if (res)
141 return res;
Arvid Brodin51f3c602014-07-04 23:37:27 +0200142 }
143
Arvid Brodinc5a75912014-07-04 23:38:05 +0200144 port = hsr_port_get_hsr(hsr, type);
145 if (port != NULL)
146 return -EBUSY; /* This port already exists */
147
148 port = kzalloc(sizeof(*port), GFP_KERNEL);
149 if (port == NULL)
150 return -ENOMEM;
151
152 if (type != HSR_PT_MASTER) {
153 res = hsr_portdev_setup(dev, port);
154 if (res)
155 goto fail_dev_setup;
156 }
157
158 port->hsr = hsr;
159 port->dev = dev;
160 port->type = type;
161
162 list_add_tail_rcu(&port->port_list, &hsr->ports);
Arvid Brodin51f3c602014-07-04 23:37:27 +0200163 synchronize_rcu();
Arvid Brodinc5a75912014-07-04 23:38:05 +0200164
165 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
Arvid Brodin1cc1eb52014-07-04 23:38:57 +0200166 netdev_update_features(master->dev);
Arvid Brodinc5a75912014-07-04 23:38:05 +0200167 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
168
169 return 0;
170
171fail_dev_setup:
172 kfree(port);
173 return res;
174}
175
176void hsr_del_port(struct hsr_port *port)
177{
178 struct hsr_priv *hsr;
179 struct hsr_port *master;
180
181 hsr = port->hsr;
182 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
183 list_del_rcu(&port->port_list);
184
185 if (port != master) {
Arvid Brodin56b08fd2015-02-27 21:26:03 +0100186 if (master != NULL) {
187 netdev_update_features(master->dev);
188 dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
189 }
Arvid Brodinc5a75912014-07-04 23:38:05 +0200190 netdev_rx_handler_unregister(port->dev);
191 dev_set_promiscuity(port->dev, -1);
192 }
193
194 /* FIXME?
195 * netdev_upper_dev_unlink(port->dev, port->hsr->dev);
196 */
197
198 synchronize_rcu();
Arvid Brodin56b08fd2015-02-27 21:26:03 +0100199
200 if (port != master)
201 dev_put(port->dev);
Arvid Brodin51f3c602014-07-04 23:37:27 +0200202}