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Linux/include/net/l3mdev.h

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  1 /*
  2  * include/net/l3mdev.h - L3 master device API
  3  * Copyright (c) 2015 Cumulus Networks
  4  * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
  5  *
  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.
 10  */
 11 #ifndef _NET_L3MDEV_H_
 12 #define _NET_L3MDEV_H_
 13 
 14 #include <net/dst.h>
 15 #include <net/fib_rules.h>
 16 
 17 /**
 18  * struct l3mdev_ops - l3mdev operations
 19  *
 20  * @l3mdev_fib_table: Get FIB table id to use for lookups
 21  *
 22  * @l3mdev_l3_rcv:    Hook in L3 receive path
 23  *
 24  * @l3mdev_l3_out:    Hook in L3 output path
 25  *
 26  * @l3mdev_link_scope_lookup: IPv6 lookup for linklocal and mcast destinations
 27  */
 28 
 29 struct l3mdev_ops {
 30         u32             (*l3mdev_fib_table)(const struct net_device *dev);
 31         struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev,
 32                                           struct sk_buff *skb, u16 proto);
 33         struct sk_buff * (*l3mdev_l3_out)(struct net_device *dev,
 34                                           struct sock *sk, struct sk_buff *skb,
 35                                           u16 proto);
 36 
 37         /* IPv6 ops */
 38         struct dst_entry * (*l3mdev_link_scope_lookup)(const struct net_device *dev,
 39                                                  struct flowi6 *fl6);
 40 };
 41 
 42 #ifdef CONFIG_NET_L3_MASTER_DEV
 43 
 44 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
 45                           struct fib_lookup_arg *arg);
 46 
 47 void l3mdev_update_flow(struct net *net, struct flowi *fl);
 48 
 49 int l3mdev_master_ifindex_rcu(const struct net_device *dev);
 50 static inline int l3mdev_master_ifindex(struct net_device *dev)
 51 {
 52         int ifindex;
 53 
 54         rcu_read_lock();
 55         ifindex = l3mdev_master_ifindex_rcu(dev);
 56         rcu_read_unlock();
 57 
 58         return ifindex;
 59 }
 60 
 61 static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
 62 {
 63         struct net_device *dev;
 64         int rc = 0;
 65 
 66         if (likely(ifindex)) {
 67                 rcu_read_lock();
 68 
 69                 dev = dev_get_by_index_rcu(net, ifindex);
 70                 if (dev)
 71                         rc = l3mdev_master_ifindex_rcu(dev);
 72 
 73                 rcu_read_unlock();
 74         }
 75 
 76         return rc;
 77 }
 78 
 79 static inline
 80 struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev)
 81 {
 82         /* netdev_master_upper_dev_get_rcu calls
 83          * list_first_or_null_rcu to walk the upper dev list.
 84          * list_first_or_null_rcu does not handle a const arg. We aren't
 85          * making changes, just want the master device from that list so
 86          * typecast to remove the const
 87          */
 88         struct net_device *dev = (struct net_device *)_dev;
 89         struct net_device *master;
 90 
 91         if (!dev)
 92                 return NULL;
 93 
 94         if (netif_is_l3_master(dev))
 95                 master = dev;
 96         else if (netif_is_l3_slave(dev))
 97                 master = netdev_master_upper_dev_get_rcu(dev);
 98         else
 99                 master = NULL;
100 
101         return master;
102 }
103 
104 u32 l3mdev_fib_table_rcu(const struct net_device *dev);
105 u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
106 static inline u32 l3mdev_fib_table(const struct net_device *dev)
107 {
108         u32 tb_id;
109 
110         rcu_read_lock();
111         tb_id = l3mdev_fib_table_rcu(dev);
112         rcu_read_unlock();
113 
114         return tb_id;
115 }
116 
117 static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
118 {
119         struct net_device *dev;
120         bool rc = false;
121 
122         if (ifindex == 0)
123                 return false;
124 
125         rcu_read_lock();
126 
127         dev = dev_get_by_index_rcu(net, ifindex);
128         if (dev)
129                 rc = netif_is_l3_master(dev);
130 
131         rcu_read_unlock();
132 
133         return rc;
134 }
135 
136 struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6);
137 
138 static inline
139 struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto)
140 {
141         struct net_device *master = NULL;
142 
143         if (netif_is_l3_slave(skb->dev))
144                 master = netdev_master_upper_dev_get_rcu(skb->dev);
145         else if (netif_is_l3_master(skb->dev))
146                 master = skb->dev;
147 
148         if (master && master->l3mdev_ops->l3mdev_l3_rcv)
149                 skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto);
150 
151         return skb;
152 }
153 
154 static inline
155 struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
156 {
157         return l3mdev_l3_rcv(skb, AF_INET);
158 }
159 
160 static inline
161 struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
162 {
163         return l3mdev_l3_rcv(skb, AF_INET6);
164 }
165 
166 static inline
167 struct sk_buff *l3mdev_l3_out(struct sock *sk, struct sk_buff *skb, u16 proto)
168 {
169         struct net_device *dev = skb_dst(skb)->dev;
170 
171         if (netif_is_l3_slave(dev)) {
172                 struct net_device *master;
173 
174                 master = netdev_master_upper_dev_get_rcu(dev);
175                 if (master && master->l3mdev_ops->l3mdev_l3_out)
176                         skb = master->l3mdev_ops->l3mdev_l3_out(master, sk,
177                                                                 skb, proto);
178         }
179 
180         return skb;
181 }
182 
183 static inline
184 struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
185 {
186         return l3mdev_l3_out(sk, skb, AF_INET);
187 }
188 
189 static inline
190 struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
191 {
192         return l3mdev_l3_out(sk, skb, AF_INET6);
193 }
194 #else
195 
196 static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev)
197 {
198         return 0;
199 }
200 static inline int l3mdev_master_ifindex(struct net_device *dev)
201 {
202         return 0;
203 }
204 
205 static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
206 {
207         return 0;
208 }
209 
210 static inline
211 struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev)
212 {
213         return NULL;
214 }
215 
216 static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
217 {
218         return 0;
219 }
220 static inline u32 l3mdev_fib_table(const struct net_device *dev)
221 {
222         return 0;
223 }
224 static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
225 {
226         return 0;
227 }
228 
229 static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
230 {
231         return false;
232 }
233 
234 static inline
235 struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6)
236 {
237         return NULL;
238 }
239 
240 static inline
241 struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
242 {
243         return skb;
244 }
245 
246 static inline
247 struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
248 {
249         return skb;
250 }
251 
252 static inline
253 struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
254 {
255         return skb;
256 }
257 
258 static inline
259 struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
260 {
261         return skb;
262 }
263 
264 static inline
265 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
266                           struct fib_lookup_arg *arg)
267 {
268         return 1;
269 }
270 static inline
271 void l3mdev_update_flow(struct net *net, struct flowi *fl)
272 {
273 }
274 #endif
275 
276 #endif /* _NET_L3MDEV_H_ */
277 

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