[deliverable/linux.git] / net / l3mdev / l3mdev.c

/*
 * net/l3mdev/l3mdev.c - L3 master device implementation
 * Copyright (c) 2015 Cumulus Networks
 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
 *
 * 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.
 */

#include <linux/netdevice.h>
#include <net/l3mdev.h>

/**
 *	l3mdev_master_ifindex - get index of L3 master device
 *	@dev: targeted interface
 */

int l3mdev_master_ifindex_rcu(const struct net_device *dev)
{
	int ifindex = 0;

	if (!dev)
		return 0;

	if (netif_is_l3_master(dev)) {
		ifindex = dev->ifindex;
	} else if (netif_is_l3_slave(dev)) {
		struct net_device *master;
		struct net_device *_dev = (struct net_device *)dev;

		/* netdev_master_upper_dev_get_rcu calls
		 * list_first_or_null_rcu to walk the upper dev list.
		 * list_first_or_null_rcu does not handle a const arg. We aren't
		 * making changes, just want the master device from that list so
		 * typecast to remove the const
		 */
		master = netdev_master_upper_dev_get_rcu(_dev);
		if (master)
			ifindex = master->ifindex;
	}

	return ifindex;
}
EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);

/**
 *	l3mdev_fib_table - get FIB table id associated with an L3
 *                             master interface
 *	@dev: targeted interface
 */

u32 l3mdev_fib_table_rcu(const struct net_device *dev)
{
	u32 tb_id = 0;

	if (!dev)
		return 0;

	if (netif_is_l3_master(dev)) {
		if (dev->l3mdev_ops->l3mdev_fib_table)
			tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev);
	} else if (netif_is_l3_slave(dev)) {
		/* Users of netdev_master_upper_dev_get_rcu need non-const,
		 * but current inet_*type functions take a const
		 */
		struct net_device *_dev = (struct net_device *) dev;
		const struct net_device *master;

		master = netdev_master_upper_dev_get_rcu(_dev);
		if (master &&
		    master->l3mdev_ops->l3mdev_fib_table)
			tb_id = master->l3mdev_ops->l3mdev_fib_table(master);
	}

	return tb_id;
}
EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);

u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
{
	struct net_device *dev;
	u32 tb_id = 0;

	if (!ifindex)
		return 0;

	rcu_read_lock();

	dev = dev_get_by_index_rcu(net, ifindex);
	if (dev)
		tb_id = l3mdev_fib_table_rcu(dev);

	rcu_read_unlock();

	return tb_id;
}
EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);

/**
 *	l3mdev_get_rt6_dst - IPv6 route lookup based on flow. Returns
 *			     cached route for L3 master device if relevant
 *			     to flow
 *	@net: network namespace for device index lookup
 *	@fl6: IPv6 flow struct for lookup
 */

struct dst_entry *l3mdev_get_rt6_dst(struct net *net,
				     const struct flowi6 *fl6)
{
	struct dst_entry *dst = NULL;
	struct net_device *dev;

	if (fl6->flowi6_oif) {
		rcu_read_lock();

		dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
		if (dev && netif_is_l3_slave(dev))
			dev = netdev_master_upper_dev_get_rcu(dev);

		if (dev && netif_is_l3_master(dev) &&
		    dev->l3mdev_ops->l3mdev_get_rt6_dst)
			dst = dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6);

		rcu_read_unlock();
	}

	return dst;
}
EXPORT_SYMBOL_GPL(l3mdev_get_rt6_dst);

/**
 *	l3mdev_get_saddr - get source address for a flow based on an interface
 *			   enslaved to an L3 master device
 *	@net: network namespace for device index lookup
 *	@ifindex: Interface index
 *	@fl4: IPv4 flow struct
 */

int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4)
{
	struct net_device *dev;
	int rc = 0;

	if (ifindex) {
		rcu_read_lock();

		dev = dev_get_by_index_rcu(net, ifindex);
		if (dev && netif_is_l3_slave(dev))
			dev = netdev_master_upper_dev_get_rcu(dev);

		if (dev && netif_is_l3_master(dev) &&
		    dev->l3mdev_ops->l3mdev_get_saddr)
			rc = dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);

		rcu_read_unlock();
	}

	return rc;
}
EXPORT_SYMBOL_GPL(l3mdev_get_saddr);
Commit	Line	Data
1b69c6d0 DA	1	/*
	2	* net/l3mdev/l3mdev.c - L3 master device implementation
	3	* Copyright (c) 2015 Cumulus Networks
	4	* Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*/
	11
	12	#include <linux/netdevice.h>
	13	#include <net/l3mdev.h>
	14
	15	/**
	16	* l3mdev_master_ifindex - get index of L3 master device
	17	* @dev: targeted interface
	18	*/
	19
3f2fb9a8	20	int l3mdev_master_ifindex_rcu(const struct net_device *dev)
1b69c6d0 DA	21	{
	22	int ifindex = 0;
	23
	24	if (!dev)
	25	return 0;
	26
	27	if (netif_is_l3_master(dev)) {
	28	ifindex = dev->ifindex;
fee6d4c7	29	} else if (netif_is_l3_slave(dev)) {
1b69c6d0	30	struct net_device *master;
3f2fb9a8 DA	31	struct net_device _dev = (struct net_device )dev;
	32
	33	/* netdev_master_upper_dev_get_rcu calls
	34	* list_first_or_null_rcu to walk the upper dev list.
	35	* list_first_or_null_rcu does not handle a const arg. We aren't
	36	* making changes, just want the master device from that list so
	37	* typecast to remove the const
	38	*/
	39	master = netdev_master_upper_dev_get_rcu(_dev);
fee6d4c7	40	if (master)
1b69c6d0 DA	41	ifindex = master->ifindex;
	42	}
	43
	44	return ifindex;
	45	}
	46	EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);
	47
	48	/**
	49	* l3mdev_fib_table - get FIB table id associated with an L3
	50	* master interface
	51	* @dev: targeted interface
	52	*/
	53
	54	u32 l3mdev_fib_table_rcu(const struct net_device *dev)
	55	{
	56	u32 tb_id = 0;
	57
	58	if (!dev)
	59	return 0;
	60
	61	if (netif_is_l3_master(dev)) {
	62	if (dev->l3mdev_ops->l3mdev_fib_table)
	63	tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev);
fee6d4c7	64	} else if (netif_is_l3_slave(dev)) {
1b69c6d0 DA	65	/* Users of netdev_master_upper_dev_get_rcu need non-const,
	66	* but current inet_*type functions take a const
	67	*/
	68	struct net_device _dev = (struct net_device ) dev;
	69	const struct net_device *master;
	70
	71	master = netdev_master_upper_dev_get_rcu(_dev);
fee6d4c7	72	if (master &&
1b69c6d0 DA	73	master->l3mdev_ops->l3mdev_fib_table)
	74	tb_id = master->l3mdev_ops->l3mdev_fib_table(master);
	75	}
	76
	77	return tb_id;
	78	}
	79	EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);
	80
	81	u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
	82	{
	83	struct net_device *dev;
	84	u32 tb_id = 0;
	85
	86	if (!ifindex)
	87	return 0;
	88
	89	rcu_read_lock();
	90
	91	dev = dev_get_by_index_rcu(net, ifindex);
	92	if (dev)
	93	tb_id = l3mdev_fib_table_rcu(dev);
	94
	95	rcu_read_unlock();
	96
	97	return tb_id;
	98	}
	99	EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);
4a65896f DA	100
	101	/**
	102	* l3mdev_get_rt6_dst - IPv6 route lookup based on flow. Returns
	103	* cached route for L3 master device if relevant
	104	* to flow
	105	* @net: network namespace for device index lookup
	106	* @fl6: IPv6 flow struct for lookup
	107	*/
	108
	109	struct dst_entry l3mdev_get_rt6_dst(struct net net,
	110	const struct flowi6 *fl6)
	111	{
	112	struct dst_entry *dst = NULL;
	113	struct net_device *dev;
	114
1ff23bee DA	115	if (fl6->flowi6_oif) {
	116	rcu_read_lock();
	117
	118	dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
	119	if (dev && netif_is_l3_slave(dev))
	120	dev = netdev_master_upper_dev_get_rcu(dev);
	121
	122	if (dev && netif_is_l3_master(dev) &&
4a65896f DA	123	dev->l3mdev_ops->l3mdev_get_rt6_dst)
4a65896f DA	124	dst = dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6);
1ff23bee DA	125
1ff23bee DA	126	rcu_read_unlock();
4a65896f DA	127	}
	128
	129	return dst;
	130	}
	131	EXPORT_SYMBOL_GPL(l3mdev_get_rt6_dst);
	132
	133	/**
	134	* l3mdev_get_saddr - get source address for a flow based on an interface
	135	* enslaved to an L3 master device
	136	* @net: network namespace for device index lookup
	137	* @ifindex: Interface index
	138	* @fl4: IPv4 flow struct
	139	*/
	140
	141	int l3mdev_get_saddr(struct net net, int ifindex, struct flowi4 fl4)
	142	{
	143	struct net_device *dev;
	144	int rc = 0;
	145
	146	if (ifindex) {
	147	rcu_read_lock();
	148
	149	dev = dev_get_by_index_rcu(net, ifindex);
1ff23bee DA	150	if (dev && netif_is_l3_slave(dev))
	151	dev = netdev_master_upper_dev_get_rcu(dev);
	152
4a65896f DA	153	if (dev && netif_is_l3_master(dev) &&
	154	dev->l3mdev_ops->l3mdev_get_saddr)
	155	rc = dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);
	156
	157	rcu_read_unlock();
	158	}
	159
	160	return rc;
	161	}
	162	EXPORT_SYMBOL_GPL(l3mdev_get_saddr);