| /* |
| * 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_ |
| |
| #include <net/fib_rules.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); |
| struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev, |
| struct sk_buff *skb, u16 proto); |
| |
| /* 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, |
| struct flowi6 *fl6); |
| int (*l3mdev_get_saddr6)(struct net_device *dev, |
| const struct sock *sk, |
| struct flowi6 *fl6); |
| }; |
| |
| #ifdef CONFIG_NET_L3_MASTER_DEV |
| |
| int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, |
| struct fib_lookup_arg *arg); |
| |
| void l3mdev_update_flow(struct net *net, struct flowi *fl); |
| |
| 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; |
| } |
| |
| static inline |
| const struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev) |
| { |
| /* netdev_master_upper_dev_get_rcu calls |
| * list_first_or_null_rcu to walk the upper dev list. |
| * list_first_or_null_rcu does not handle a const arg. We aren't |
| * making changes, just want the master device from that list so |
| * typecast to remove the const |
| */ |
| struct net_device *dev = (struct net_device *)_dev; |
| const struct net_device *master; |
| |
| if (!dev) |
| return NULL; |
| |
| if (netif_is_l3_master(dev)) |
| master = dev; |
| else if (netif_is_l3_slave(dev)) |
| master = netdev_master_upper_dev_get_rcu(dev); |
| else |
| master = NULL; |
| |
| return master; |
| } |
| |
| /* 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; |
| } |
| |
| int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4); |
| |
| struct dst_entry *l3mdev_get_rt6_dst(struct net *net, struct flowi6 *fl6); |
| int l3mdev_get_saddr6(struct net *net, const struct sock *sk, |
| struct flowi6 *fl6); |
| |
| static inline |
| struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto) |
| { |
| struct net_device *master = NULL; |
| |
| if (netif_is_l3_slave(skb->dev)) |
| master = netdev_master_upper_dev_get_rcu(skb->dev); |
| else if (netif_is_l3_master(skb->dev)) |
| master = skb->dev; |
| |
| if (master && master->l3mdev_ops->l3mdev_l3_rcv) |
| skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto); |
| |
| return skb; |
| } |
| |
| static inline |
| struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) |
| { |
| return l3mdev_l3_rcv(skb, AF_INET); |
| } |
| |
| static inline |
| struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) |
| { |
| return l3mdev_l3_rcv(skb, AF_INET6); |
| } |
| |
| #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 |
| const struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev) |
| { |
| return NULL; |
| } |
| |
| 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(struct net *net, struct flowi6 *fl6) |
| { |
| return NULL; |
| } |
| |
| static inline int l3mdev_get_saddr6(struct net *net, const struct sock *sk, |
| struct flowi6 *fl6) |
| { |
| return 0; |
| } |
| |
| static inline |
| struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) |
| { |
| return skb; |
| } |
| |
| static inline |
| struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) |
| { |
| return skb; |
| } |
| |
| static inline |
| int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, |
| struct fib_lookup_arg *arg) |
| { |
| return 1; |
| } |
| static inline |
| void l3mdev_update_flow(struct net *net, struct flowi *fl) |
| { |
| } |
| #endif |
| |
| #endif /* _NET_L3MDEV_H_ */ |