223 lines
4.8 KiB
C
223 lines
4.8 KiB
C
/*
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* include/net/l3mdev.h - L3 master device API
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* Copyright (c) 2015 Cumulus Networks
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* Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef _NET_L3MDEV_H_
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#define _NET_L3MDEV_H_
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/**
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* struct l3mdev_ops - l3mdev operations
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*
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* @l3mdev_fib_table: Get FIB table id to use for lookups
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*
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* @l3mdev_get_rtable: Get cached IPv4 rtable (dst_entry) for device
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*
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* @l3mdev_get_saddr: Get source address for a flow
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*
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* @l3mdev_get_rt6_dst: Get cached IPv6 rt6_info (dst_entry) for device
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*/
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struct l3mdev_ops {
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u32 (*l3mdev_fib_table)(const struct net_device *dev);
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/* IPv4 ops */
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struct rtable * (*l3mdev_get_rtable)(const struct net_device *dev,
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const struct flowi4 *fl4);
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void (*l3mdev_get_saddr)(struct net_device *dev,
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struct flowi4 *fl4);
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/* IPv6 ops */
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struct dst_entry * (*l3mdev_get_rt6_dst)(const struct net_device *dev,
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const struct flowi6 *fl6);
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};
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#ifdef CONFIG_NET_L3_MASTER_DEV
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int l3mdev_master_ifindex_rcu(struct net_device *dev);
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static inline int l3mdev_master_ifindex(struct net_device *dev)
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{
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int ifindex;
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rcu_read_lock();
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ifindex = l3mdev_master_ifindex_rcu(dev);
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rcu_read_unlock();
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return ifindex;
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}
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/* get index of an interface to use for FIB lookups. For devices
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* enslaved to an L3 master device FIB lookups are based on the
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* master index
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*/
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static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
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{
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return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex;
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}
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static inline int l3mdev_fib_oif(struct net_device *dev)
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{
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int oif;
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rcu_read_lock();
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oif = l3mdev_fib_oif_rcu(dev);
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rcu_read_unlock();
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return oif;
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}
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u32 l3mdev_fib_table_rcu(const struct net_device *dev);
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u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
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static inline u32 l3mdev_fib_table(const struct net_device *dev)
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{
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u32 tb_id;
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rcu_read_lock();
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tb_id = l3mdev_fib_table_rcu(dev);
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rcu_read_unlock();
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return tb_id;
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}
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static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
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const struct flowi4 *fl4)
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{
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if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable)
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return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4);
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return NULL;
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}
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static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
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{
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struct net_device *dev;
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bool rc = false;
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if (ifindex == 0)
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return false;
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rcu_read_lock();
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dev = dev_get_by_index_rcu(net, ifindex);
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if (dev)
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rc = netif_is_l3_master(dev);
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rcu_read_unlock();
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return rc;
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}
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static inline void l3mdev_get_saddr(struct net *net, int ifindex,
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struct flowi4 *fl4)
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{
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struct net_device *dev;
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if (ifindex) {
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rcu_read_lock();
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dev = dev_get_by_index_rcu(net, ifindex);
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if (dev && netif_is_l3_master(dev) &&
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dev->l3mdev_ops->l3mdev_get_saddr) {
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dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);
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}
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rcu_read_unlock();
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}
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}
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static inline struct dst_entry *l3mdev_get_rt6_dst(const struct net_device *dev,
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const struct flowi6 *fl6)
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{
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if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rt6_dst)
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return dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6);
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return NULL;
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}
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static inline
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struct dst_entry *l3mdev_rt6_dst_by_oif(struct net *net,
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const struct flowi6 *fl6)
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{
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struct dst_entry *dst = NULL;
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struct net_device *dev;
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dev = dev_get_by_index(net, fl6->flowi6_oif);
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if (dev) {
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dst = l3mdev_get_rt6_dst(dev, fl6);
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dev_put(dev);
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}
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return dst;
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}
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#else
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static inline int l3mdev_master_ifindex_rcu(struct net_device *dev)
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{
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return 0;
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}
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static inline int l3mdev_master_ifindex(struct net_device *dev)
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{
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return 0;
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}
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static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
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{
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return dev ? dev->ifindex : 0;
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}
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static inline int l3mdev_fib_oif(struct net_device *dev)
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{
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return dev ? dev->ifindex : 0;
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}
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static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
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{
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return 0;
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}
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static inline u32 l3mdev_fib_table(const struct net_device *dev)
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{
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return 0;
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}
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static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
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{
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return 0;
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}
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static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
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const struct flowi4 *fl4)
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{
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return NULL;
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}
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static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
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{
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return false;
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}
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static inline void l3mdev_get_saddr(struct net *net, int ifindex,
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struct flowi4 *fl4)
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{
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}
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static inline
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struct dst_entry *l3mdev_get_rt6_dst(const struct net_device *dev,
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const struct flowi6 *fl6)
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{
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return NULL;
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}
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static inline
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struct dst_entry *l3mdev_rt6_dst_by_oif(struct net *net,
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const struct flowi6 *fl6)
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{
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return NULL;
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}
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#endif
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#endif /* _NET_L3MDEV_H_ */
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