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v5.4
  1// SPDX-License-Identifier: GPL-2.0
  2/* Copyright 2011-2014 Autronica Fire and Security AS
  3 *
 
 
 
 
 
  4 * Author(s):
  5 *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
  6 */
  7
  8#include "hsr_slave.h"
  9#include <linux/etherdevice.h>
 10#include <linux/if_arp.h>
 11#include <linux/if_vlan.h>
 12#include "hsr_main.h"
 13#include "hsr_device.h"
 14#include "hsr_forward.h"
 15#include "hsr_framereg.h"
 16
 
 17static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
 18{
 19	struct sk_buff *skb = *pskb;
 20	struct hsr_port *port;
 21	u16 protocol;
 22
 23	if (!skb_mac_header_was_set(skb)) {
 24		WARN_ONCE(1, "%s: skb invalid", __func__);
 25		return RX_HANDLER_PASS;
 26	}
 27
 28	rcu_read_lock(); /* hsr->node_db, hsr->ports */
 29	port = hsr_port_get_rcu(skb->dev);
 30
 31	if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) {
 32		/* Directly kill frames sent by ourselves */
 33		kfree_skb(skb);
 34		goto finish_consume;
 35	}
 36
 37	protocol = eth_hdr(skb)->h_proto;
 38	if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR))
 39		goto finish_pass;
 40
 41	skb_push(skb, ETH_HLEN);
 42
 43	hsr_forward_skb(skb, port);
 44
 45finish_consume:
 46	rcu_read_unlock(); /* hsr->node_db, hsr->ports */
 47	return RX_HANDLER_CONSUMED;
 48
 49finish_pass:
 50	rcu_read_unlock(); /* hsr->node_db, hsr->ports */
 51	return RX_HANDLER_PASS;
 52}
 53
 54bool hsr_port_exists(const struct net_device *dev)
 55{
 56	return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame;
 57}
 58
 
 59static int hsr_check_dev_ok(struct net_device *dev)
 60{
 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");
 65		return -EINVAL;
 66	}
 67
 68	/* Don't allow enslaving hsr devices */
 69	if (is_hsr_master(dev)) {
 70		netdev_info(dev, "Cannot create trees of HSR devices.\n");
 71		return -EINVAL;
 72	}
 73
 74	if (hsr_port_exists(dev)) {
 75		netdev_info(dev, "This device is already a HSR slave.\n");
 76		return -EINVAL;
 77	}
 78
 79	if (is_vlan_dev(dev)) {
 80		netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n");
 81		return -EINVAL;
 82	}
 83
 84	if (dev->priv_flags & IFF_DONT_BRIDGE) {
 85		netdev_info(dev, "This device does not support bridging.\n");
 86		return -EOPNOTSUPP;
 87	}
 88
 89	/* HSR over bonded devices has not been tested, but I'm not sure it
 90	 * won't work...
 91	 */
 92
 93	return 0;
 94}
 95
 
 96/* Setup device to be added to the HSR bridge. */
 97static int hsr_portdev_setup(struct net_device *dev, struct hsr_port *port)
 98{
 99	int res;
100
101	dev_hold(dev);
102	res = dev_set_promiscuity(dev, 1);
103	if (res)
104		goto fail_promiscuity;
105
106	/* FIXME:
107	 * What does net device "adjacency" mean? Should we do
108	 * res = netdev_master_upper_dev_link(port->dev, port->hsr->dev); ?
109	 */
110
111	res = netdev_rx_handler_register(dev, hsr_handle_frame, port);
112	if (res)
113		goto fail_rx_handler;
114	dev_disable_lro(dev);
115
116	return 0;
117
118fail_rx_handler:
119	dev_set_promiscuity(dev, -1);
120fail_promiscuity:
121	dev_put(dev);
122
123	return res;
124}
125
126int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev,
127		 enum hsr_port_type type)
128{
129	struct hsr_port *port, *master;
130	int res;
131
132	if (type != HSR_PT_MASTER) {
133		res = hsr_check_dev_ok(dev);
134		if (res)
135			return res;
136	}
137
138	port = hsr_port_get_hsr(hsr, type);
139	if (port)
140		return -EBUSY;	/* This port already exists */
141
142	port = kzalloc(sizeof(*port), GFP_KERNEL);
143	if (!port)
144		return -ENOMEM;
145
146	if (type != HSR_PT_MASTER) {
147		res = hsr_portdev_setup(dev, port);
148		if (res)
149			goto fail_dev_setup;
150	}
151
152	port->hsr = hsr;
153	port->dev = dev;
154	port->type = type;
155
156	list_add_tail_rcu(&port->port_list, &hsr->ports);
157	synchronize_rcu();
158
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));
162
163	return 0;
164
165fail_dev_setup:
166	kfree(port);
167	return res;
168}
169
170void hsr_del_port(struct hsr_port *port)
171{
172	struct hsr_priv *hsr;
173	struct hsr_port *master;
174
175	hsr = port->hsr;
176	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
177	list_del_rcu(&port->port_list);
178
179	if (port != master) {
180		if (master) {
181			netdev_update_features(master->dev);
182			dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
183		}
184		netdev_rx_handler_unregister(port->dev);
185		dev_set_promiscuity(port->dev, -1);
186	}
187
188	/* FIXME?
189	 * netdev_upper_dev_unlink(port->dev, port->hsr->dev);
190	 */
191
192	synchronize_rcu();
193
194	if (port != master)
195		dev_put(port->dev);
196	kfree(port);
197}
v4.10.11
 
  1/* 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>
 14#include <linux/if_arp.h>
 
 15#include "hsr_main.h"
 16#include "hsr_device.h"
 17#include "hsr_forward.h"
 18#include "hsr_framereg.h"
 19
 20
 21static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
 22{
 23	struct sk_buff *skb = *pskb;
 24	struct hsr_port *port;
 25	u16 protocol;
 26
 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
 41	protocol = eth_hdr(skb)->h_proto;
 42	if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR))
 43		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
 64static int hsr_check_dev_ok(struct net_device *dev)
 65{
 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
 79	if (hsr_port_exists(dev)) {
 80		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
 89	if (dev->priv_flags & IFF_DONT_BRIDGE) {
 90		netdev_info(dev, "This device does not support bridging.\n");
 91		return -EOPNOTSUPP;
 92	}
 93
 94	/* 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
102/* Setup device to be added to the HSR bridge. */
103static int hsr_portdev_setup(struct net_device *dev, struct hsr_port *port)
104{
105	int res;
106
107	dev_hold(dev);
108	res = dev_set_promiscuity(dev, 1);
109	if (res)
110		goto fail_promiscuity;
111
112	/* FIXME:
113	 * What does net device "adjacency" mean? Should we do
114	 * res = netdev_master_upper_dev_link(port->dev, port->hsr->dev); ?
115	 */
116
117	res = netdev_rx_handler_register(dev, hsr_handle_frame, port);
118	if (res)
119		goto fail_rx_handler;
120	dev_disable_lro(dev);
121
122	return 0;
123
124fail_rx_handler:
125	dev_set_promiscuity(dev, -1);
126fail_promiscuity:
127	dev_put(dev);
128
129	return res;
130}
131
132int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev,
133		 enum hsr_port_type type)
134{
135	struct hsr_port *port, *master;
136	int res;
137
138	if (type != HSR_PT_MASTER) {
139		res = hsr_check_dev_ok(dev);
140		if (res)
141			return res;
142	}
143
144	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);
163	synchronize_rcu();
164
165	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
166	netdev_update_features(master->dev);
167	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) {
186		if (master != NULL) {
187			netdev_update_features(master->dev);
188			dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
189		}
190		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();
199
200	if (port != master)
201		dev_put(port->dev);
 
202}