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linux
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/**
15 * struct l3mdev_ops - l3mdev operations
16 *
17 * @l3mdev_fib_table: Get FIB table id to use for lookups
18 *
19 * @l3mdev_get_rtable: Get cached IPv4 rtable (dst_entry) for device
20 *
21 * @l3mdev_get_saddr: Get source address for a flow
22 *
23 * @l3mdev_get_rt6_dst: Get cached IPv6 rt6_info (dst_entry) for device
24 */
25
26struct l3mdev_ops {
27 u32 (*l3mdev_fib_table)(const struct net_device *dev);
28
29 /* IPv4 ops */
30 struct rtable * (*l3mdev_get_rtable)(const struct net_device *dev,
31 const struct flowi4 *fl4);
32 int (*l3mdev_get_saddr)(struct net_device *dev,
33 struct flowi4 *fl4);
34
35 /* IPv6 ops */
36 struct dst_entry * (*l3mdev_get_rt6_dst)(const struct net_device *dev,
37 const struct flowi6 *fl6);
38};
39
40#ifdef CONFIG_NET_L3_MASTER_DEV
41
42int l3mdev_master_ifindex_rcu(struct net_device *dev);
43static inline int l3mdev_master_ifindex(struct net_device *dev)
44{
45 int ifindex;
46
47 rcu_read_lock();
48 ifindex = l3mdev_master_ifindex_rcu(dev);
49 rcu_read_unlock();
50
51 return ifindex;
52}
53
54static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
55{
56 struct net_device *dev;
57 int rc = 0;
58
59 if (likely(ifindex)) {
60 rcu_read_lock();
61
62 dev = dev_get_by_index_rcu(net, ifindex);
63 if (dev)
64 rc = l3mdev_master_ifindex_rcu(dev);
65
66 rcu_read_unlock();
67 }
68
69 return rc;
70}
71
72/* get index of an interface to use for FIB lookups. For devices
73 * enslaved to an L3 master device FIB lookups are based on the
74 * master index
75 */
76static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
77{
78 return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex;
79}
80
81static inline int l3mdev_fib_oif(struct net_device *dev)
82{
83 int oif;
84
85 rcu_read_lock();
86 oif = l3mdev_fib_oif_rcu(dev);
87 rcu_read_unlock();
88
89 return oif;
90}
91
92u32 l3mdev_fib_table_rcu(const struct net_device *dev);
93u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
94static inline u32 l3mdev_fib_table(const struct net_device *dev)
95{
96 u32 tb_id;
97
98 rcu_read_lock();
99 tb_id = l3mdev_fib_table_rcu(dev);
100 rcu_read_unlock();
101
102 return tb_id;
103}
104
105static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
106 const struct flowi4 *fl4)
107{
108 if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable)
109 return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4);
110
111 return NULL;
112}
113
114static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
115{
116 struct net_device *dev;
117 bool rc = false;
118
119 if (ifindex == 0)
120 return false;
121
122 rcu_read_lock();
123
124 dev = dev_get_by_index_rcu(net, ifindex);
125 if (dev)
126 rc = netif_is_l3_master(dev);
127
128 rcu_read_unlock();
129
130 return rc;
131}
132
133static inline int l3mdev_get_saddr(struct net *net, int ifindex,
134 struct flowi4 *fl4)
135{
136 struct net_device *dev;
137 int rc = 0;
138
139 if (ifindex) {
140
141 rcu_read_lock();
142
143 dev = dev_get_by_index_rcu(net, ifindex);
144 if (dev && netif_is_l3_master(dev) &&
145 dev->l3mdev_ops->l3mdev_get_saddr) {
146 rc = dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);
147 }
148
149 rcu_read_unlock();
150 }
151
152 return rc;
153}
154
155static inline struct dst_entry *l3mdev_get_rt6_dst(const struct net_device *dev,
156 const struct flowi6 *fl6)
157{
158 if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rt6_dst)
159 return dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6);
160
161 return NULL;
162}
163
164static inline
165struct dst_entry *l3mdev_rt6_dst_by_oif(struct net *net,
166 const struct flowi6 *fl6)
167{
168 struct dst_entry *dst = NULL;
169 struct net_device *dev;
170
171 dev = dev_get_by_index(net, fl6->flowi6_oif);
172 if (dev) {
173 dst = l3mdev_get_rt6_dst(dev, fl6);
174 dev_put(dev);
175 }
176
177 return dst;
178}
179
180#else
181
182static inline int l3mdev_master_ifindex_rcu(struct net_device *dev)
183{
184 return 0;
185}
186static inline int l3mdev_master_ifindex(struct net_device *dev)
187{
188 return 0;
189}
190
191static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
192{
193 return 0;
194}
195
196static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
197{
198 return dev ? dev->ifindex : 0;
199}
200static inline int l3mdev_fib_oif(struct net_device *dev)
201{
202 return dev ? dev->ifindex : 0;
203}
204
205static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
206{
207 return 0;
208}
209static inline u32 l3mdev_fib_table(const struct net_device *dev)
210{
211 return 0;
212}
213static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
214{
215 return 0;
216}
217
218static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
219 const struct flowi4 *fl4)
220{
221 return NULL;
222}
223
224static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
225{
226 return false;
227}
228
229static inline int l3mdev_get_saddr(struct net *net, int ifindex,
230 struct flowi4 *fl4)
231{
232 return 0;
233}
234
235static inline
236struct dst_entry *l3mdev_get_rt6_dst(const struct net_device *dev,
237 const struct flowi6 *fl6)
238{
239 return NULL;
240}
241static inline
242struct dst_entry *l3mdev_rt6_dst_by_oif(struct net *net,
243 const struct flowi6 *fl6)
244{
245 return NULL;
246}
247#endif
248
249#endif /* _NET_L3MDEV_H_ */