[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);
	struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev,
					  struct sk_buff *skb, u16 proto);

	/* 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);

static inline
struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto)
{
	struct net_device *master = NULL;

	if (netif_is_l3_slave(skb->dev))
		master = netdev_master_upper_dev_get_rcu(skb->dev);
	else if (netif_is_l3_master(skb->dev))
		master = skb->dev;

	if (master && master->l3mdev_ops->l3mdev_l3_rcv)
		skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto);

	return skb;
}

static inline
struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
{
	return l3mdev_l3_rcv(skb, AF_INET);
}

static inline
struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
{
	return l3mdev_l3_rcv(skb, AF_INET6);
}

#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;
}

static inline
struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
{
	return skb;
}

static inline
struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
{
	return skb;
}
#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);
74b20582 DA	28	struct sk_buff * (l3mdev_l3_rcv)(struct net_device dev,
74b20582 DA	29	struct sk_buff *skb, u16 proto);
ccf3c8c3 DA	30
ccf3c8c3 DA	31	/* IPv4 ops */
1b69c6d0 DA	32	struct rtable * (l3mdev_get_rtable)(const struct net_device dev,
1b69c6d0 DA	33	const struct flowi4 *fl4);
b5bdacf3	34	int (l3mdev_get_saddr)(struct net_device dev,
8cbb512c	35	struct flowi4 *fl4);
ccf3c8c3 DA	36
	37	/* IPv6 ops */
	38	struct dst_entry * (l3mdev_get_rt6_dst)(const struct net_device dev,
	39	const struct flowi6 *fl6);
1b69c6d0 DA	40	};
	41
	42	#ifdef CONFIG_NET_L3_MASTER_DEV
	43
3f2fb9a8	44	int l3mdev_master_ifindex_rcu(const struct net_device *dev);
1b69c6d0 DA	45	static inline int l3mdev_master_ifindex(struct net_device *dev)
	46	{
	47	int ifindex;
	48
	49	rcu_read_lock();
	50	ifindex = l3mdev_master_ifindex_rcu(dev);
	51	rcu_read_unlock();
	52
	53	return ifindex;
	54	}
	55
1a852479 DA	56	static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
	57	{
	58	struct net_device *dev;
	59	int rc = 0;
	60
	61	if (likely(ifindex)) {
	62	rcu_read_lock();
	63
	64	dev = dev_get_by_index_rcu(net, ifindex);
	65	if (dev)
	66	rc = l3mdev_master_ifindex_rcu(dev);
	67
	68	rcu_read_unlock();
	69	}
	70
	71	return rc;
	72	}
	73
1b69c6d0 DA	74	/* get index of an interface to use for FIB lookups. For devices
	75	* enslaved to an L3 master device FIB lookups are based on the
	76	* master index
	77	*/
	78	static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
	79	{
	80	return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex;
	81	}
	82
	83	static inline int l3mdev_fib_oif(struct net_device *dev)
	84	{
	85	int oif;
	86
	87	rcu_read_lock();
	88	oif = l3mdev_fib_oif_rcu(dev);
	89	rcu_read_unlock();
	90
	91	return oif;
	92	}
	93
	94	u32 l3mdev_fib_table_rcu(const struct net_device *dev);
	95	u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
	96	static inline u32 l3mdev_fib_table(const struct net_device *dev)
	97	{
	98	u32 tb_id;
	99
	100	rcu_read_lock();
	101	tb_id = l3mdev_fib_table_rcu(dev);
	102	rcu_read_unlock();
	103
	104	return tb_id;
	105	}
	106
	107	static inline struct rtable l3mdev_get_rtable(const struct net_device dev,
	108	const struct flowi4 *fl4)
	109	{
	110	if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable)
	111	return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4);
	112
	113	return NULL;
	114	}
	115
9478d12d DA	116	static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
	117	{
	118	struct net_device *dev;
	119	bool rc = false;
	120
	121	if (ifindex == 0)
	122	return false;
	123
	124	rcu_read_lock();
	125
	126	dev = dev_get_by_index_rcu(net, ifindex);
	127	if (dev)
	128	rc = netif_is_l3_master(dev);
	129
	130	rcu_read_unlock();
	131
	132	return rc;
	133	}
	134
4a65896f	135	int l3mdev_get_saddr(struct net net, int ifindex, struct flowi4 fl4);
8cbb512c	136
4a65896f	137	struct dst_entry l3mdev_get_rt6_dst(struct net net, const struct flowi6 *fl6);
ccf3c8c3	138
74b20582 DA	139	static inline
	140	struct sk_buff l3mdev_l3_rcv(struct sk_buff skb, u16 proto)
	141	{
	142	struct net_device *master = NULL;
	143
	144	if (netif_is_l3_slave(skb->dev))
	145	master = netdev_master_upper_dev_get_rcu(skb->dev);
	146	else if (netif_is_l3_master(skb->dev))
	147	master = skb->dev;
	148
	149	if (master && master->l3mdev_ops->l3mdev_l3_rcv)
	150	skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto);
	151
	152	return skb;
	153	}
	154
	155	static inline
	156	struct sk_buff l3mdev_ip_rcv(struct sk_buff skb)
	157	{
	158	return l3mdev_l3_rcv(skb, AF_INET);
	159	}
	160
	161	static inline
	162	struct sk_buff l3mdev_ip6_rcv(struct sk_buff skb)
	163	{
	164	return l3mdev_l3_rcv(skb, AF_INET6);
	165	}
	166
1b69c6d0 DA	167	#else
1b69c6d0 DA	168
3f2fb9a8	169	static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev)
1b69c6d0 DA	170	{
	171	return 0;
	172	}
	173	static inline int l3mdev_master_ifindex(struct net_device *dev)
	174	{
	175	return 0;
	176	}
	177
1a852479 DA	178	static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
	179	{
	180	return 0;
	181	}
	182
1b69c6d0 DA	183	static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
	184	{
	185	return dev ? dev->ifindex : 0;
	186	}
	187	static inline int l3mdev_fib_oif(struct net_device *dev)
	188	{
	189	return dev ? dev->ifindex : 0;
	190	}
	191
	192	static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
	193	{
	194	return 0;
	195	}
	196	static inline u32 l3mdev_fib_table(const struct net_device *dev)
	197	{
	198	return 0;
	199	}
	200	static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
	201	{
	202	return 0;
	203	}
	204
	205	static inline struct rtable l3mdev_get_rtable(const struct net_device dev,
	206	const struct flowi4 *fl4)
	207	{
	208	return NULL;
	209	}
	210
9478d12d DA	211	static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
	212	{
	213	return false;
	214	}
	215
b5bdacf3 DA	216	static inline int l3mdev_get_saddr(struct net *net, int ifindex,
b5bdacf3 DA	217	struct flowi4 *fl4)
8cbb512c	218	{
b5bdacf3	219	return 0;
8cbb512c	220	}
ccf3c8c3 DA	221
ccf3c8c3 DA	222	static inline
4a65896f	223	struct dst_entry l3mdev_get_rt6_dst(struct net net, const struct flowi6 *fl6)
ccf3c8c3 DA	224	{
	225	return NULL;
	226	}
74b20582 DA	227
	228	static inline
	229	struct sk_buff l3mdev_ip_rcv(struct sk_buff skb)
	230	{
	231	return skb;
	232	}
	233
	234	static inline
	235	struct sk_buff l3mdev_ip6_rcv(struct sk_buff skb)
	236	{
	237	return skb;
	238	}
1b69c6d0 DA	239	#endif
	240
	241	#endif /* _NET_L3MDEV_H_ */