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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
29struct 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
44int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
45 struct fib_lookup_arg *arg);
46
47void l3mdev_update_flow(struct net *net, struct flowi *fl);
48
49int l3mdev_master_ifindex_rcu(const struct net_device *dev);
50static 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
61static 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
79static inline
80struct 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
104int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex);
105static inline
106int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex)
107{
108 rcu_read_lock();
109 ifindex = l3mdev_master_upper_ifindex_by_index_rcu(net, ifindex);
110 rcu_read_unlock();
111
112 return ifindex;
113}
114
115u32 l3mdev_fib_table_rcu(const struct net_device *dev);
116u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
117static inline u32 l3mdev_fib_table(const struct net_device *dev)
118{
119 u32 tb_id;
120
121 rcu_read_lock();
122 tb_id = l3mdev_fib_table_rcu(dev);
123 rcu_read_unlock();
124
125 return tb_id;
126}
127
128static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
129{
130 struct net_device *dev;
131 bool rc = false;
132
133 if (ifindex == 0)
134 return false;
135
136 rcu_read_lock();
137
138 dev = dev_get_by_index_rcu(net, ifindex);
139 if (dev)
140 rc = netif_is_l3_master(dev);
141
142 rcu_read_unlock();
143
144 return rc;
145}
146
147struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6);
148
149static inline
150struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto)
151{
152 struct net_device *master = NULL;
153
154 if (netif_is_l3_slave(skb->dev))
155 master = netdev_master_upper_dev_get_rcu(skb->dev);
156 else if (netif_is_l3_master(skb->dev) ||
157 netif_has_l3_rx_handler(skb->dev))
158 master = skb->dev;
159
160 if (master && master->l3mdev_ops->l3mdev_l3_rcv)
161 skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto);
162
163 return skb;
164}
165
166static inline
167struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
168{
169 return l3mdev_l3_rcv(skb, AF_INET);
170}
171
172static inline
173struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
174{
175 return l3mdev_l3_rcv(skb, AF_INET6);
176}
177
178static inline
179struct sk_buff *l3mdev_l3_out(struct sock *sk, struct sk_buff *skb, u16 proto)
180{
181 struct net_device *dev = skb_dst(skb)->dev;
182
183 if (netif_is_l3_slave(dev)) {
184 struct net_device *master;
185
186 master = netdev_master_upper_dev_get_rcu(dev);
187 if (master && master->l3mdev_ops->l3mdev_l3_out)
188 skb = master->l3mdev_ops->l3mdev_l3_out(master, sk,
189 skb, proto);
190 }
191
192 return skb;
193}
194
195static inline
196struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
197{
198 return l3mdev_l3_out(sk, skb, AF_INET);
199}
200
201static inline
202struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
203{
204 return l3mdev_l3_out(sk, skb, AF_INET6);
205}
206#else
207
208static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev)
209{
210 return 0;
211}
212static inline int l3mdev_master_ifindex(struct net_device *dev)
213{
214 return 0;
215}
216
217static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
218{
219 return 0;
220}
221
222static inline
223int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex)
224{
225 return 0;
226}
227static inline
228int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex)
229{
230 return 0;
231}
232
233static inline
234struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev)
235{
236 return NULL;
237}
238
239static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
240{
241 return 0;
242}
243static inline u32 l3mdev_fib_table(const struct net_device *dev)
244{
245 return 0;
246}
247static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
248{
249 return 0;
250}
251
252static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
253{
254 return false;
255}
256
257static inline
258struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6)
259{
260 return NULL;
261}
262
263static inline
264struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
265{
266 return skb;
267}
268
269static inline
270struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
271{
272 return skb;
273}
274
275static inline
276struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
277{
278 return skb;
279}
280
281static inline
282struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
283{
284 return skb;
285}
286
287static inline
288int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
289 struct fib_lookup_arg *arg)
290{
291 return 1;
292}
293static inline
294void l3mdev_update_flow(struct net *net, struct flowi *fl)
295{
296}
297#endif
298
299#endif /* _NET_L3MDEV_H_ */