/* * 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;} 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 inlinestruct 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(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 inlinestruct dst_entry *l3mdev_get_rt6_dst(const struct net_device *dev,				     const struct flowi6 *fl6){	return NULL;}static inlinestruct dst_entry *l3mdev_rt6_dst_by_oif(struct net *net,					const struct flowi6 *fl6){	return NULL;}#endif #endif /* _NET_L3MDEV_H_ */