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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;
- }
- /* 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_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_ */
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