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

/* Copyright 2011-2014 Autronica Fire and Security AS
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * Author(s):
 *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
 */

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

	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;
	}

	if (eth_hdr(skb)->h_proto != htons(ETH_P_PRP))
		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 (dev->priv_flags & IFF_802_1Q_VLAN) {
		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 != NULL)
		return -EBUSY;	/* This port already exists */

	port = kzalloc(sizeof(*port), GFP_KERNEL);
	if (port == NULL)
		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 != NULL) {
			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);
}
Commit	Line	Data
81ba6afd AB	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>
51f3c605	14	#include <linux/if_arp.h>
81ba6afd	15	#include "hsr_main.h"
51f3c605	16	#include "hsr_device.h"
f266a683	17	#include "hsr_forward.h"
81ba6afd AB	18	#include "hsr_framereg.h"
	19
	20
f266a683 AB	21	static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
	22	{
	23	struct sk_buff skb = pskb;
	24	struct hsr_port *port;
	25
	26	if (!skb_mac_header_was_set(skb)) {
	27	WARN_ONCE(1, "%s: skb invalid", __func__);
	28	return RX_HANDLER_PASS;
	29	}
	30
	31	rcu_read_lock(); /* hsr->node_db, hsr->ports */
	32	port = hsr_port_get_rcu(skb->dev);
	33
	34	if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) {
	35	/* Directly kill frames sent by ourselves */
	36	kfree_skb(skb);
	37	goto finish_consume;
	38	}
	39
	40	if (eth_hdr(skb)->h_proto != htons(ETH_P_PRP))
	41	goto finish_pass;
	42
	43	skb_push(skb, ETH_HLEN);
	44
	45	hsr_forward_skb(skb, port);
	46
	47	finish_consume:
	48	rcu_read_unlock(); /* hsr->node_db, hsr->ports */
	49	return RX_HANDLER_CONSUMED;
	50
	51	finish_pass:
	52	rcu_read_unlock(); /* hsr->node_db, hsr->ports */
	53	return RX_HANDLER_PASS;
	54	}
	55
	56	bool hsr_port_exists(const struct net_device *dev)
	57	{
	58	return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame;
	59	}
	60
	61
c5a75911	62	static int hsr_check_dev_ok(struct net_device *dev)
51f3c605 AB	63	{
	64	/* Don't allow HSR on non-ethernet like devices */
	65	if ((dev->flags & IFF_LOOPBACK) \|\| (dev->type != ARPHRD_ETHER) \|\|
	66	(dev->addr_len != ETH_ALEN)) {
	67	netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n");
	68	return -EINVAL;
	69	}
	70
	71	/* Don't allow enslaving hsr devices */
	72	if (is_hsr_master(dev)) {
	73	netdev_info(dev, "Cannot create trees of HSR devices.\n");
	74	return -EINVAL;
	75	}
	76
c5a75911	77	if (hsr_port_exists(dev)) {
51f3c605 AB	78	netdev_info(dev, "This device is already a HSR slave.\n");
	79	return -EINVAL;
	80	}
	81
	82	if (dev->priv_flags & IFF_802_1Q_VLAN) {
	83	netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n");
	84	return -EINVAL;
	85	}
	86
f266a683 AB	87	if (dev->priv_flags & IFF_DONT_BRIDGE) {
	88	netdev_info(dev, "This device does not support bridging.\n");
	89	return -EOPNOTSUPP;
	90	}
	91
51f3c605 AB	92	/* HSR over bonded devices has not been tested, but I'm not sure it
	93	* won't work...
	94	*/
	95
	96	return 0;
	97	}
	98
	99
c5a75911 AB	100	/* Setup device to be added to the HSR bridge. */
c5a75911 AB	101	static int hsr_portdev_setup(struct net_device dev, struct hsr_port port)
51f3c605 AB	102	{
	103	int res;
	104
	105	dev_hold(dev);
51f3c605 AB	106	res = dev_set_promiscuity(dev, 1);
51f3c605 AB	107	if (res)
c5a75911	108	goto fail_promiscuity;
51f3c605	109
c5a75911 AB	110	/* FIXME:
	111	* What does net device "adjacency" mean? Should we do
	112	* res = netdev_master_upper_dev_link(port->dev, port->hsr->dev); ?
	113	*/
51f3c605	114
f266a683 AB	115	res = netdev_rx_handler_register(dev, hsr_handle_frame, port);
	116	if (res)
	117	goto fail_rx_handler;
	118	dev_disable_lro(dev);
	119
51f3c605 AB	120	return 0;
	121
	122	fail_rx_handler:
	123	dev_set_promiscuity(dev, -1);
c5a75911	124	fail_promiscuity:
51f3c605	125	dev_put(dev);
c5a75911	126
51f3c605 AB	127	return res;
	128	}
	129
c5a75911 AB	130	int hsr_add_port(struct hsr_priv hsr, struct net_device dev,
c5a75911 AB	131	enum hsr_port_type type)
51f3c605	132	{
c5a75911 AB	133	struct hsr_port port, master;
c5a75911 AB	134	int res;
51f3c605	135
c5a75911 AB	136	if (type != HSR_PT_MASTER) {
	137	res = hsr_check_dev_ok(dev);
	138	if (res)
	139	return res;
	140	}
	141
	142	port = hsr_port_get_hsr(hsr, type);
	143	if (port != NULL)
	144	return -EBUSY; /* This port already exists */
	145
	146	port = kzalloc(sizeof(*port), GFP_KERNEL);
	147	if (port == NULL)
	148	return -ENOMEM;
	149
	150	if (type != HSR_PT_MASTER) {
	151	res = hsr_portdev_setup(dev, port);
	152	if (res)
	153	goto fail_dev_setup;
	154	}
	155
	156	port->hsr = hsr;
	157	port->dev = dev;
	158	port->type = type;
	159
	160	list_add_tail_rcu(&port->port_list, &hsr->ports);
	161	synchronize_rcu();
	162
	163	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
1cc1eb52	164	netdev_update_features(master->dev);
c5a75911	165	dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
51f3c605	166
c5a75911 AB	167	return 0;
	168
	169	fail_dev_setup:
	170	kfree(port);
	171	return res;
	172	}
	173
	174	void hsr_del_port(struct hsr_port *port)
	175	{
	176	struct hsr_priv *hsr;
	177	struct hsr_port *master;
	178
	179	hsr = port->hsr;
	180	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
	181	list_del_rcu(&port->port_list);
	182
	183	if (port != master) {
56b08fdc AB	184	if (master != NULL) {
	185	netdev_update_features(master->dev);
	186	dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
	187	}
c5a75911 AB	188	netdev_rx_handler_unregister(port->dev);
c5a75911 AB	189	dev_set_promiscuity(port->dev, -1);
51f3c605 AB	190	}
51f3c605 AB	191
c5a75911 AB	192	/* FIXME?
	193	* netdev_upper_dev_unlink(port->dev, port->hsr->dev);
	194	*/
	195
51f3c605	196	synchronize_rcu();
56b08fdc AB	197
	198	if (port != master)
	199	dev_put(port->dev);
51f3c605	200	}