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/*
* 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(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;
}
static inline 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_master(dev) &&
dev->l3mdev_ops->l3mdev_get_saddr) {
rc = dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);
}
rcu_read_unlock();
}
return rc;
}
static inline struct dst_entry *l3mdev_get_rt6_dst(const struct net_device *dev,
const struct flowi6 *fl6)
{
if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rt6_dst)
return dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6);
return NULL;
}
static inline
struct dst_entry *l3mdev_rt6_dst_by_oif(struct net *net,
const struct flowi6 *fl6)
{
struct dst_entry *dst = NULL;
struct net_device *dev;
dev = dev_get_by_index(net, fl6->flowi6_oif);
if (dev) {
dst = l3mdev_get_rt6_dst(dev, fl6);
dev_put(dev);
}
return dst;
}
#else
static inline int l3mdev_master_ifindex_rcu(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(const struct net_device *dev,
const struct flowi6 *fl6)
{
return NULL;
}
static inline
struct dst_entry *l3mdev_rt6_dst_by_oif(struct net *net,
const struct flowi6 *fl6)
{
return NULL;
}
#endif
#endif /* _NET_L3MDEV_H_ */