2 * include/net/l3mdev.h - L3 master device API
3 * Copyright (c) 2015 Cumulus Networks
4 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 #ifndef _NET_L3MDEV_H_
12 #define _NET_L3MDEV_H_
15 #include <net/fib_rules.h>
18 * struct l3mdev_ops - l3mdev operations
20 * @l3mdev_fib_table: Get FIB table id to use for lookups
22 * @l3mdev_l3_rcv: Hook in L3 receive path
24 * @l3mdev_l3_out: Hook in L3 output path
26 * @l3mdev_get_rtable: Get cached IPv4 rtable (dst_entry) for device
28 * @l3mdev_link_scope_lookup: IPv6 lookup for linklocal and mcast destinations
32 u32 (*l3mdev_fib_table)(const struct net_device *dev);
33 struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev,
34 struct sk_buff *skb, u16 proto);
35 struct sk_buff * (*l3mdev_l3_out)(struct net_device *dev,
36 struct sock *sk, struct sk_buff *skb,
40 struct rtable * (*l3mdev_get_rtable)(const struct net_device *dev,
41 const struct flowi4 *fl4);
44 struct dst_entry * (*l3mdev_link_scope_lookup)(const struct net_device *dev,
46 int (*l3mdev_get_saddr6)(struct net_device *dev,
47 const struct sock *sk,
51 #ifdef CONFIG_NET_L3_MASTER_DEV
53 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
54 struct fib_lookup_arg *arg);
56 void l3mdev_update_flow(struct net *net, struct flowi *fl);
58 int l3mdev_master_ifindex_rcu(const struct net_device *dev);
59 static inline int l3mdev_master_ifindex(struct net_device *dev)
64 ifindex = l3mdev_master_ifindex_rcu(dev);
70 static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
72 struct net_device *dev;
75 if (likely(ifindex)) {
78 dev = dev_get_by_index_rcu(net, ifindex);
80 rc = l3mdev_master_ifindex_rcu(dev);
89 struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev)
91 /* netdev_master_upper_dev_get_rcu calls
92 * list_first_or_null_rcu to walk the upper dev list.
93 * list_first_or_null_rcu does not handle a const arg. We aren't
94 * making changes, just want the master device from that list so
95 * typecast to remove the const
97 struct net_device *dev = (struct net_device *)_dev;
98 struct net_device *master;
103 if (netif_is_l3_master(dev))
105 else if (netif_is_l3_slave(dev))
106 master = netdev_master_upper_dev_get_rcu(dev);
113 /* get index of an interface to use for FIB lookups. For devices
114 * enslaved to an L3 master device FIB lookups are based on the
117 static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
119 return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex;
122 static inline int l3mdev_fib_oif(struct net_device *dev)
127 oif = l3mdev_fib_oif_rcu(dev);
133 u32 l3mdev_fib_table_rcu(const struct net_device *dev);
134 u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
135 static inline u32 l3mdev_fib_table(const struct net_device *dev)
140 tb_id = l3mdev_fib_table_rcu(dev);
146 static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
147 const struct flowi4 *fl4)
149 if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable)
150 return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4);
155 static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
157 struct net_device *dev;
165 dev = dev_get_by_index_rcu(net, ifindex);
167 rc = netif_is_l3_master(dev);
174 struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6);
175 int l3mdev_get_saddr6(struct net *net, const struct sock *sk,
179 struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto)
181 struct net_device *master = NULL;
183 if (netif_is_l3_slave(skb->dev))
184 master = netdev_master_upper_dev_get_rcu(skb->dev);
185 else if (netif_is_l3_master(skb->dev))
188 if (master && master->l3mdev_ops->l3mdev_l3_rcv)
189 skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto);
195 struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
197 return l3mdev_l3_rcv(skb, AF_INET);
201 struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
203 return l3mdev_l3_rcv(skb, AF_INET6);
207 struct sk_buff *l3mdev_l3_out(struct sock *sk, struct sk_buff *skb, u16 proto)
209 struct net_device *dev = skb_dst(skb)->dev;
211 if (netif_is_l3_slave(dev)) {
212 struct net_device *master;
214 master = netdev_master_upper_dev_get_rcu(dev);
215 if (master && master->l3mdev_ops->l3mdev_l3_out)
216 skb = master->l3mdev_ops->l3mdev_l3_out(master, sk,
224 struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
226 return l3mdev_l3_out(sk, skb, AF_INET);
230 struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
232 return l3mdev_l3_out(sk, skb, AF_INET6);
236 static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev)
240 static inline int l3mdev_master_ifindex(struct net_device *dev)
245 static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
251 struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev)
256 static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
258 return dev ? dev->ifindex : 0;
260 static inline int l3mdev_fib_oif(struct net_device *dev)
262 return dev ? dev->ifindex : 0;
265 static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
269 static inline u32 l3mdev_fib_table(const struct net_device *dev)
273 static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
278 static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
279 const struct flowi4 *fl4)
284 static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
290 struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6)
295 static inline int l3mdev_get_saddr6(struct net *net, const struct sock *sk,
302 struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
308 struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
314 struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
320 struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
326 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
327 struct fib_lookup_arg *arg)
332 void l3mdev_update_flow(struct net *net, struct flowi *fl)
337 #endif /* _NET_L3MDEV_H_ */