[deliverable/linux.git] / include / net / l3mdev.h

/*
 * include/net/l3mdev.h - L3 master device API
 * 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.
 */
#ifndef _NET_L3MDEV_H_
#define _NET_L3MDEV_H_

/**
 * struct l3mdev_ops - l3mdev operations
 *
 * @l3mdev_fib_table: Get FIB table id to use for lookups
 *
 * @l3mdev_get_rtable: Get cached IPv4 rtable (dst_entry) for device
 *
 * @l3mdev_get_saddr: Get source address for a flow
 *
 * @l3mdev_get_rt6_dst: Get cached IPv6 rt6_info (dst_entry) for device
 */

struct l3mdev_ops {
	u32		(*l3mdev_fib_table)(const struct net_device *dev);

	/* IPv4 ops */
	struct rtable *	(*l3mdev_get_rtable)(const struct net_device *dev,
					     const struct flowi4 *fl4);
	int		(*l3mdev_get_saddr)(struct net_device *dev,
					    struct flowi4 *fl4);

	/* IPv6 ops */
	struct dst_entry * (*l3mdev_get_rt6_dst)(const struct net_device *dev,
						 const struct flowi6 *fl6);
};

#ifdef CONFIG_NET_L3_MASTER_DEV

int l3mdev_master_ifindex_rcu(const struct net_device *dev);
static inline int l3mdev_master_ifindex(struct net_device *dev)
{
	int ifindex;

	rcu_read_lock();
	ifindex = l3mdev_master_ifindex_rcu(dev);
	rcu_read_unlock();

	return ifindex;
}

static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
{
	struct net_device *dev;
	int rc = 0;

	if (likely(ifindex)) {
		rcu_read_lock();

		dev = dev_get_by_index_rcu(net, ifindex);
		if (dev)
			rc = l3mdev_master_ifindex_rcu(dev);

		rcu_read_unlock();
	}

	return rc;
}

/* get index of an interface to use for FIB lookups. For devices
 * enslaved to an L3 master device FIB lookups are based on the
 * master index
 */
static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
{
	return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex;
}

static inline int l3mdev_fib_oif(struct net_device *dev)
{
	int oif;

	rcu_read_lock();
	oif = l3mdev_fib_oif_rcu(dev);
	rcu_read_unlock();

	return oif;
}

u32 l3mdev_fib_table_rcu(const struct net_device *dev);
u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
static inline u32 l3mdev_fib_table(const struct net_device *dev)
{
	u32 tb_id;

	rcu_read_lock();
	tb_id = l3mdev_fib_table_rcu(dev);
	rcu_read_unlock();

	return tb_id;
}

static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
					       const struct flowi4 *fl4)
{
	if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable)
		return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4);

	return NULL;
}

static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
{
	struct net_device *dev;
	bool rc = false;

	if (ifindex == 0)
		return false;

	rcu_read_lock();

	dev = dev_get_by_index_rcu(net, ifindex);
	if (dev)
		rc = netif_is_l3_master(dev);

	rcu_read_unlock();

	return rc;
}

int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4);

struct dst_entry *l3mdev_get_rt6_dst(struct net *net, const struct flowi6 *fl6);

#else

static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev)
{
	return 0;
}
static inline int l3mdev_master_ifindex(struct net_device *dev)
{
	return 0;
}

static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
{
	return 0;
}

static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
{
	return dev ? dev->ifindex : 0;
}
static inline int l3mdev_fib_oif(struct net_device *dev)
{
	return dev ? dev->ifindex : 0;
}

static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
{
	return 0;
}
static inline u32 l3mdev_fib_table(const struct net_device *dev)
{
	return 0;
}
static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
{
	return 0;
}

static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
					       const struct flowi4 *fl4)
{
	return NULL;
}

static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
{
	return false;
}

static inline int l3mdev_get_saddr(struct net *net, int ifindex,
				   struct flowi4 *fl4)
{
	return 0;
}

static inline
struct dst_entry *l3mdev_get_rt6_dst(struct net *net, const struct flowi6 *fl6)
{
	return NULL;
}
#endif

#endif /* _NET_L3MDEV_H_ */
Commit	Line	Data
1b69c6d0 DA	1	/*
	2	* include/net/l3mdev.h - L3 master device API
	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	#ifndef _NET_L3MDEV_H_
	12	#define _NET_L3MDEV_H_
	13
	14	/**
	15	* struct l3mdev_ops - l3mdev operations
	16	*
	17	* @l3mdev_fib_table: Get FIB table id to use for lookups
	18	*
	19	* @l3mdev_get_rtable: Get cached IPv4 rtable (dst_entry) for device
8cbb512c DA	20	*
8cbb512c DA	21	* @l3mdev_get_saddr: Get source address for a flow
ccf3c8c3 DA	22	*
ccf3c8c3 DA	23	* @l3mdev_get_rt6_dst: Get cached IPv6 rt6_info (dst_entry) for device
1b69c6d0 DA	24	*/
	25
	26	struct l3mdev_ops {
	27	u32 (l3mdev_fib_table)(const struct net_device dev);
ccf3c8c3 DA	28
ccf3c8c3 DA	29	/* IPv4 ops */
1b69c6d0 DA	30	struct rtable * (l3mdev_get_rtable)(const struct net_device dev,
1b69c6d0 DA	31	const struct flowi4 *fl4);
b5bdacf3	32	int (l3mdev_get_saddr)(struct net_device dev,
8cbb512c	33	struct flowi4 *fl4);
ccf3c8c3 DA	34
	35	/* IPv6 ops */
	36	struct dst_entry * (l3mdev_get_rt6_dst)(const struct net_device dev,
	37	const struct flowi6 *fl6);
1b69c6d0 DA	38	};
	39
	40	#ifdef CONFIG_NET_L3_MASTER_DEV
	41
3f2fb9a8	42	int l3mdev_master_ifindex_rcu(const struct net_device *dev);
1b69c6d0 DA	43	static inline int l3mdev_master_ifindex(struct net_device *dev)
	44	{
	45	int ifindex;
	46
	47	rcu_read_lock();
	48	ifindex = l3mdev_master_ifindex_rcu(dev);
	49	rcu_read_unlock();
	50
	51	return ifindex;
	52	}
	53
1a852479 DA	54	static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
	55	{
	56	struct net_device *dev;
	57	int rc = 0;
	58
	59	if (likely(ifindex)) {
	60	rcu_read_lock();
	61
	62	dev = dev_get_by_index_rcu(net, ifindex);
	63	if (dev)
	64	rc = l3mdev_master_ifindex_rcu(dev);
	65
	66	rcu_read_unlock();
	67	}
	68
	69	return rc;
	70	}
	71
1b69c6d0 DA	72	/* get index of an interface to use for FIB lookups. For devices
	73	* enslaved to an L3 master device FIB lookups are based on the
	74	* master index
	75	*/
	76	static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
	77	{
	78	return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex;
	79	}
	80
	81	static inline int l3mdev_fib_oif(struct net_device *dev)
	82	{
	83	int oif;
	84
	85	rcu_read_lock();
	86	oif = l3mdev_fib_oif_rcu(dev);
	87	rcu_read_unlock();
	88
	89	return oif;
	90	}
	91
	92	u32 l3mdev_fib_table_rcu(const struct net_device *dev);
	93	u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
	94	static inline u32 l3mdev_fib_table(const struct net_device *dev)
	95	{
	96	u32 tb_id;
	97
	98	rcu_read_lock();
	99	tb_id = l3mdev_fib_table_rcu(dev);
	100	rcu_read_unlock();
	101
	102	return tb_id;
	103	}
	104
	105	static inline struct rtable l3mdev_get_rtable(const struct net_device dev,
	106	const struct flowi4 *fl4)
	107	{
	108	if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable)
	109	return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4);
	110
	111	return NULL;
	112	}
	113
9478d12d DA	114	static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
	115	{
	116	struct net_device *dev;
	117	bool rc = false;
	118
	119	if (ifindex == 0)
	120	return false;
	121
	122	rcu_read_lock();
	123
	124	dev = dev_get_by_index_rcu(net, ifindex);
	125	if (dev)
	126	rc = netif_is_l3_master(dev);
	127
	128	rcu_read_unlock();
	129
	130	return rc;
	131	}
	132
4a65896f	133	int l3mdev_get_saddr(struct net net, int ifindex, struct flowi4 fl4);
8cbb512c	134
4a65896f	135	struct dst_entry l3mdev_get_rt6_dst(struct net net, const struct flowi6 *fl6);
ccf3c8c3	136
1b69c6d0 DA	137	#else
1b69c6d0 DA	138
3f2fb9a8	139	static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev)
1b69c6d0 DA	140	{
	141	return 0;
	142	}
	143	static inline int l3mdev_master_ifindex(struct net_device *dev)
	144	{
	145	return 0;
	146	}
	147
1a852479 DA	148	static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
	149	{
	150	return 0;
	151	}
	152
1b69c6d0 DA	153	static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
	154	{
	155	return dev ? dev->ifindex : 0;
	156	}
	157	static inline int l3mdev_fib_oif(struct net_device *dev)
	158	{
	159	return dev ? dev->ifindex : 0;
	160	}
	161
	162	static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
	163	{
	164	return 0;
	165	}
	166	static inline u32 l3mdev_fib_table(const struct net_device *dev)
	167	{
	168	return 0;
	169	}
	170	static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
	171	{
	172	return 0;
	173	}
	174
	175	static inline struct rtable l3mdev_get_rtable(const struct net_device dev,
	176	const struct flowi4 *fl4)
	177	{
	178	return NULL;
	179	}
	180
9478d12d DA	181	static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
	182	{
	183	return false;
	184	}
	185
b5bdacf3 DA	186	static inline int l3mdev_get_saddr(struct net *net, int ifindex,
b5bdacf3 DA	187	struct flowi4 *fl4)
8cbb512c	188	{
b5bdacf3	189	return 0;
8cbb512c	190	}
ccf3c8c3 DA	191
ccf3c8c3 DA	192	static inline
4a65896f	193	struct dst_entry l3mdev_get_rt6_dst(struct net net, const struct flowi6 *fl6)
ccf3c8c3 DA	194	{
	195	return NULL;
	196	}
1b69c6d0 DA	197	#endif
	198
	199	#endif /* _NET_L3MDEV_H_ */