[linux-2.6-block.git] / net / hsr / hsr_slave.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright 2011-2014 Autronica Fire and Security AS
 *
 * Author(s):
 *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
 */

#include "hsr_slave.h"
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/if_vlan.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;
	u16 protocol;

	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;
	}

	protocol = eth_hdr(skb)->h_proto;
	if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR))
		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 (is_vlan_dev(dev)) {
		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)
		return -EBUSY;	/* This port already exists */

	port = kzalloc(sizeof(*port), GFP_KERNEL);
	if (!port)
		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) {
		if (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();

	if (port != master)
		dev_put(port->dev);
	kfree(port);
}
Commit	Line	Data
0e7623bd	1	// SPDX-License-Identifier: GPL-2.0
81ba6afd	2	/* Copyright 2011-2014 Autronica Fire and Security AS
81ba6afd AB	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>
51f3c605	10	#include <linux/if_arp.h>
d0d7b10b	11	#include <linux/if_vlan.h>
81ba6afd	12	#include "hsr_main.h"
51f3c605	13	#include "hsr_device.h"
f266a683	14	#include "hsr_forward.h"
81ba6afd AB	15	#include "hsr_framereg.h"
81ba6afd AB	16
f266a683 AB	17	static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
	18	{
	19	struct sk_buff skb = pskb;
	20	struct hsr_port *port;
ee1c2797	21	u16 protocol;
f266a683 AB	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
ee1c2797 PH	37	protocol = eth_hdr(skb)->h_proto;
ee1c2797 PH	38	if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR))
f266a683 AB	39	goto finish_pass;
	40
	41	skb_push(skb, ETH_HLEN);
	42
	43	hsr_forward_skb(skb, port);
	44
	45	finish_consume:
	46	rcu_read_unlock(); /* hsr->node_db, hsr->ports */
	47	return RX_HANDLER_CONSUMED;
	48
	49	finish_pass:
	50	rcu_read_unlock(); /* hsr->node_db, hsr->ports */
	51	return RX_HANDLER_PASS;
	52	}
	53
	54	bool hsr_port_exists(const struct net_device *dev)
	55	{
	56	return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame;
	57	}
	58
c5a75911	59	static int hsr_check_dev_ok(struct net_device *dev)
51f3c605 AB	60	{
51f3c605 AB	61	/* Don't allow HSR on non-ethernet like devices */
5670342c MK	62	if ((dev->flags & IFF_LOOPBACK) \|\| dev->type != ARPHRD_ETHER \|\|
5670342c MK	63	dev->addr_len != ETH_ALEN) {
51f3c605 AB	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
c5a75911	74	if (hsr_port_exists(dev)) {
51f3c605 AB	75	netdev_info(dev, "This device is already a HSR slave.\n");
	76	return -EINVAL;
	77	}
	78
d0d7b10b	79	if (is_vlan_dev(dev)) {
51f3c605 AB	80	netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n");
	81	return -EINVAL;
	82	}
	83
f266a683 AB	84	if (dev->priv_flags & IFF_DONT_BRIDGE) {
	85	netdev_info(dev, "This device does not support bridging.\n");
	86	return -EOPNOTSUPP;
	87	}
	88
51f3c605 AB	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
c5a75911 AB	96	/* Setup device to be added to the HSR bridge. */
c5a75911 AB	97	static int hsr_portdev_setup(struct net_device dev, struct hsr_port port)
51f3c605 AB	98	{
	99	int res;
	100
	101	dev_hold(dev);
51f3c605 AB	102	res = dev_set_promiscuity(dev, 1);
51f3c605 AB	103	if (res)
c5a75911	104	goto fail_promiscuity;
51f3c605	105
c5a75911 AB	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	*/
51f3c605	110
f266a683 AB	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
51f3c605 AB	116	return 0;
	117
	118	fail_rx_handler:
	119	dev_set_promiscuity(dev, -1);
c5a75911	120	fail_promiscuity:
51f3c605	121	dev_put(dev);
c5a75911	122
51f3c605 AB	123	return res;
	124	}
	125
c5a75911 AB	126	int hsr_add_port(struct hsr_priv hsr, struct net_device dev,
c5a75911 AB	127	enum hsr_port_type type)
51f3c605	128	{
c5a75911 AB	129	struct hsr_port port, master;
c5a75911 AB	130	int res;
51f3c605	131
c5a75911 AB	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);
05ca6e64	139	if (port)
c5a75911 AB	140	return -EBUSY; /* This port already exists */
	141
	142	port = kzalloc(sizeof(*port), GFP_KERNEL);
05ca6e64	143	if (!port)
c5a75911 AB	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);
1cc1eb52	160	netdev_update_features(master->dev);
c5a75911	161	dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
51f3c605	162
c5a75911 AB	163	return 0;
	164
	165	fail_dev_setup:
	166	kfree(port);
	167	return res;
	168	}
	169
	170	void 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) {
05ca6e64	180	if (master) {
56b08fdc AB	181	netdev_update_features(master->dev);
	182	dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
	183	}
c5a75911 AB	184	netdev_rx_handler_unregister(port->dev);
c5a75911 AB	185	dev_set_promiscuity(port->dev, -1);
51f3c605 AB	186	}
51f3c605 AB	187
c5a75911 AB	188	/* FIXME?
	189	* netdev_upper_dev_unlink(port->dev, port->hsr->dev);
	190	*/
	191
51f3c605	192	synchronize_rcu();
56b08fdc AB	193
	194	if (port != master)
	195	dev_put(port->dev);
619afef0	196	kfree(port);
51f3c605	197	}