[mirror_ubuntu-artful-kernel.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 <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 != 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>
d0d7b10b	15	#include <linux/if_vlan.h>
81ba6afd	16	#include "hsr_main.h"
51f3c605	17	#include "hsr_device.h"
f266a683	18	#include "hsr_forward.h"
81ba6afd AB	19	#include "hsr_framereg.h"
	20
	21
f266a683 AB	22	static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
	23	{
	24	struct sk_buff skb = pskb;
	25	struct hsr_port *port;
ee1c2797	26	u16 protocol;
f266a683 AB	27
	28	if (!skb_mac_header_was_set(skb)) {
	29	WARN_ONCE(1, "%s: skb invalid", __func__);
	30	return RX_HANDLER_PASS;
	31	}
	32
	33	rcu_read_lock(); /* hsr->node_db, hsr->ports */
	34	port = hsr_port_get_rcu(skb->dev);
	35
	36	if (hsr_addr_is_self(port->hsr, eth_hdr(skb)->h_source)) {
	37	/* Directly kill frames sent by ourselves */
	38	kfree_skb(skb);
	39	goto finish_consume;
	40	}
	41
ee1c2797 PH	42	protocol = eth_hdr(skb)->h_proto;
ee1c2797 PH	43	if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR))
f266a683 AB	44	goto finish_pass;
	45
	46	skb_push(skb, ETH_HLEN);
	47
	48	hsr_forward_skb(skb, port);
	49
	50	finish_consume:
	51	rcu_read_unlock(); /* hsr->node_db, hsr->ports */
	52	return RX_HANDLER_CONSUMED;
	53
	54	finish_pass:
	55	rcu_read_unlock(); /* hsr->node_db, hsr->ports */
	56	return RX_HANDLER_PASS;
	57	}
	58
	59	bool hsr_port_exists(const struct net_device *dev)
	60	{
	61	return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame;
	62	}
	63
	64
c5a75911	65	static int hsr_check_dev_ok(struct net_device *dev)
51f3c605 AB	66	{
	67	/* Don't allow HSR on non-ethernet like devices */
	68	if ((dev->flags & IFF_LOOPBACK) \|\| (dev->type != ARPHRD_ETHER) \|\|
	69	(dev->addr_len != ETH_ALEN)) {
	70	netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n");
	71	return -EINVAL;
	72	}
	73
	74	/* Don't allow enslaving hsr devices */
	75	if (is_hsr_master(dev)) {
	76	netdev_info(dev, "Cannot create trees of HSR devices.\n");
	77	return -EINVAL;
	78	}
	79
c5a75911	80	if (hsr_port_exists(dev)) {
51f3c605 AB	81	netdev_info(dev, "This device is already a HSR slave.\n");
	82	return -EINVAL;
	83	}
	84
d0d7b10b	85	if (is_vlan_dev(dev)) {
51f3c605 AB	86	netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n");
	87	return -EINVAL;
	88	}
	89
f266a683 AB	90	if (dev->priv_flags & IFF_DONT_BRIDGE) {
	91	netdev_info(dev, "This device does not support bridging.\n");
	92	return -EOPNOTSUPP;
	93	}
	94
51f3c605 AB	95	/* HSR over bonded devices has not been tested, but I'm not sure it
	96	* won't work...
	97	*/
	98
	99	return 0;
	100	}
	101
	102
c5a75911 AB	103	/* Setup device to be added to the HSR bridge. */
c5a75911 AB	104	static int hsr_portdev_setup(struct net_device dev, struct hsr_port port)
51f3c605 AB	105	{
	106	int res;
	107
	108	dev_hold(dev);
51f3c605 AB	109	res = dev_set_promiscuity(dev, 1);
51f3c605 AB	110	if (res)
c5a75911	111	goto fail_promiscuity;
51f3c605	112
c5a75911 AB	113	/* FIXME:
	114	* What does net device "adjacency" mean? Should we do
	115	* res = netdev_master_upper_dev_link(port->dev, port->hsr->dev); ?
	116	*/
51f3c605	117
f266a683 AB	118	res = netdev_rx_handler_register(dev, hsr_handle_frame, port);
	119	if (res)
	120	goto fail_rx_handler;
	121	dev_disable_lro(dev);
	122
51f3c605 AB	123	return 0;
	124
	125	fail_rx_handler:
	126	dev_set_promiscuity(dev, -1);
c5a75911	127	fail_promiscuity:
51f3c605	128	dev_put(dev);
c5a75911	129
51f3c605 AB	130	return res;
	131	}
	132
c5a75911 AB	133	int hsr_add_port(struct hsr_priv hsr, struct net_device dev,
c5a75911 AB	134	enum hsr_port_type type)
51f3c605	135	{
c5a75911 AB	136	struct hsr_port port, master;
c5a75911 AB	137	int res;
51f3c605	138
c5a75911 AB	139	if (type != HSR_PT_MASTER) {
	140	res = hsr_check_dev_ok(dev);
	141	if (res)
	142	return res;
	143	}
	144
	145	port = hsr_port_get_hsr(hsr, type);
	146	if (port != NULL)
	147	return -EBUSY; /* This port already exists */
	148
	149	port = kzalloc(sizeof(*port), GFP_KERNEL);
	150	if (port == NULL)
	151	return -ENOMEM;
	152
	153	if (type != HSR_PT_MASTER) {
	154	res = hsr_portdev_setup(dev, port);
	155	if (res)
	156	goto fail_dev_setup;
	157	}
	158
	159	port->hsr = hsr;
	160	port->dev = dev;
	161	port->type = type;
	162
	163	list_add_tail_rcu(&port->port_list, &hsr->ports);
	164	synchronize_rcu();
	165
	166	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
1cc1eb52	167	netdev_update_features(master->dev);
c5a75911	168	dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
51f3c605	169
c5a75911 AB	170	return 0;
	171
	172	fail_dev_setup:
	173	kfree(port);
	174	return res;
	175	}
	176
	177	void hsr_del_port(struct hsr_port *port)
	178	{
	179	struct hsr_priv *hsr;
	180	struct hsr_port *master;
	181
	182	hsr = port->hsr;
	183	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
	184	list_del_rcu(&port->port_list);
	185
	186	if (port != master) {
56b08fdc AB	187	if (master != NULL) {
	188	netdev_update_features(master->dev);
	189	dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
	190	}
c5a75911 AB	191	netdev_rx_handler_unregister(port->dev);
c5a75911 AB	192	dev_set_promiscuity(port->dev, -1);
51f3c605 AB	193	}
51f3c605 AB	194
c5a75911 AB	195	/* FIXME?
	196	* netdev_upper_dev_unlink(port->dev, port->hsr->dev);
	197	*/
	198
51f3c605	199	synchronize_rcu();
56b08fdc AB	200
	201	if (port != master)
	202	dev_put(port->dev);
51f3c605	203	}