diff options
Diffstat (limited to 'include/net/l3mdev.h')
| -rw-r--r-- | include/net/l3mdev.h | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/include/net/l3mdev.h b/include/net/l3mdev.h new file mode 100644 index 000000000..5689a0c74 --- /dev/null +++ b/include/net/l3mdev.h @@ -0,0 +1,226 @@ +/* + * 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_ */ |