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1b69c6d0 DA |
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 | |
8cbb512c DA |
20 | * |
21 | * @l3mdev_get_saddr: Get source address for a flow | |
ccf3c8c3 DA |
22 | * |
23 | * @l3mdev_get_rt6_dst: Get cached IPv6 rt6_info (dst_entry) for device | |
1b69c6d0 DA |
24 | */ |
25 | ||
26 | struct l3mdev_ops { | |
27 | u32 (*l3mdev_fib_table)(const struct net_device *dev); | |
ccf3c8c3 DA |
28 | |
29 | /* IPv4 ops */ | |
1b69c6d0 DA |
30 | struct rtable * (*l3mdev_get_rtable)(const struct net_device *dev, |
31 | const struct flowi4 *fl4); | |
8cbb512c DA |
32 | void (*l3mdev_get_saddr)(struct net_device *dev, |
33 | struct flowi4 *fl4); | |
ccf3c8c3 DA |
34 | |
35 | /* IPv6 ops */ | |
36 | struct dst_entry * (*l3mdev_get_rt6_dst)(const struct net_device *dev, | |
37 | const struct flowi6 *fl6); | |
1b69c6d0 DA |
38 | }; |
39 | ||
40 | #ifdef CONFIG_NET_L3_MASTER_DEV | |
41 | ||
42 | int l3mdev_master_ifindex_rcu(struct net_device *dev); | |
43 | static 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 | ||
54 | /* get index of an interface to use for FIB lookups. For devices | |
55 | * enslaved to an L3 master device FIB lookups are based on the | |
56 | * master index | |
57 | */ | |
58 | static inline int l3mdev_fib_oif_rcu(struct net_device *dev) | |
59 | { | |
60 | return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex; | |
61 | } | |
62 | ||
63 | static inline int l3mdev_fib_oif(struct net_device *dev) | |
64 | { | |
65 | int oif; | |
66 | ||
67 | rcu_read_lock(); | |
68 | oif = l3mdev_fib_oif_rcu(dev); | |
69 | rcu_read_unlock(); | |
70 | ||
71 | return oif; | |
72 | } | |
73 | ||
74 | u32 l3mdev_fib_table_rcu(const struct net_device *dev); | |
75 | u32 l3mdev_fib_table_by_index(struct net *net, int ifindex); | |
76 | static inline u32 l3mdev_fib_table(const struct net_device *dev) | |
77 | { | |
78 | u32 tb_id; | |
79 | ||
80 | rcu_read_lock(); | |
81 | tb_id = l3mdev_fib_table_rcu(dev); | |
82 | rcu_read_unlock(); | |
83 | ||
84 | return tb_id; | |
85 | } | |
86 | ||
87 | static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev, | |
88 | const struct flowi4 *fl4) | |
89 | { | |
90 | if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable) | |
91 | return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4); | |
92 | ||
93 | return NULL; | |
94 | } | |
95 | ||
9478d12d DA |
96 | static inline bool netif_index_is_l3_master(struct net *net, int ifindex) |
97 | { | |
98 | struct net_device *dev; | |
99 | bool rc = false; | |
100 | ||
101 | if (ifindex == 0) | |
102 | return false; | |
103 | ||
104 | rcu_read_lock(); | |
105 | ||
106 | dev = dev_get_by_index_rcu(net, ifindex); | |
107 | if (dev) | |
108 | rc = netif_is_l3_master(dev); | |
109 | ||
110 | rcu_read_unlock(); | |
111 | ||
112 | return rc; | |
113 | } | |
114 | ||
8cbb512c DA |
115 | static inline void l3mdev_get_saddr(struct net *net, int ifindex, |
116 | struct flowi4 *fl4) | |
117 | { | |
118 | struct net_device *dev; | |
119 | ||
120 | if (ifindex) { | |
121 | ||
122 | rcu_read_lock(); | |
123 | ||
124 | dev = dev_get_by_index_rcu(net, ifindex); | |
125 | if (dev && netif_is_l3_master(dev) && | |
126 | dev->l3mdev_ops->l3mdev_get_saddr) { | |
127 | dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4); | |
128 | } | |
129 | ||
130 | rcu_read_unlock(); | |
131 | } | |
132 | } | |
133 | ||
ccf3c8c3 DA |
134 | static inline struct dst_entry *l3mdev_get_rt6_dst(const struct net_device *dev, |
135 | const struct flowi6 *fl6) | |
136 | { | |
137 | if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rt6_dst) | |
138 | return dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6); | |
139 | ||
140 | return NULL; | |
141 | } | |
142 | ||
143 | static inline | |
144 | struct dst_entry *l3mdev_rt6_dst_by_oif(struct net *net, | |
145 | const struct flowi6 *fl6) | |
146 | { | |
147 | struct dst_entry *dst = NULL; | |
148 | struct net_device *dev; | |
149 | ||
150 | dev = dev_get_by_index(net, fl6->flowi6_oif); | |
151 | if (dev) { | |
152 | dst = l3mdev_get_rt6_dst(dev, fl6); | |
153 | dev_put(dev); | |
154 | } | |
155 | ||
156 | return dst; | |
157 | } | |
158 | ||
1b69c6d0 DA |
159 | #else |
160 | ||
161 | static inline int l3mdev_master_ifindex_rcu(struct net_device *dev) | |
162 | { | |
163 | return 0; | |
164 | } | |
165 | static inline int l3mdev_master_ifindex(struct net_device *dev) | |
166 | { | |
167 | return 0; | |
168 | } | |
169 | ||
170 | static inline int l3mdev_fib_oif_rcu(struct net_device *dev) | |
171 | { | |
172 | return dev ? dev->ifindex : 0; | |
173 | } | |
174 | static inline int l3mdev_fib_oif(struct net_device *dev) | |
175 | { | |
176 | return dev ? dev->ifindex : 0; | |
177 | } | |
178 | ||
179 | static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev) | |
180 | { | |
181 | return 0; | |
182 | } | |
183 | static inline u32 l3mdev_fib_table(const struct net_device *dev) | |
184 | { | |
185 | return 0; | |
186 | } | |
187 | static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) | |
188 | { | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev, | |
193 | const struct flowi4 *fl4) | |
194 | { | |
195 | return NULL; | |
196 | } | |
197 | ||
9478d12d DA |
198 | static inline bool netif_index_is_l3_master(struct net *net, int ifindex) |
199 | { | |
200 | return false; | |
201 | } | |
202 | ||
8cbb512c DA |
203 | static inline void l3mdev_get_saddr(struct net *net, int ifindex, |
204 | struct flowi4 *fl4) | |
205 | { | |
206 | } | |
ccf3c8c3 DA |
207 | |
208 | static inline | |
209 | struct dst_entry *l3mdev_get_rt6_dst(const struct net_device *dev, | |
210 | const struct flowi6 *fl6) | |
211 | { | |
212 | return NULL; | |
213 | } | |
214 | static inline | |
215 | struct dst_entry *l3mdev_rt6_dst_by_oif(struct net *net, | |
216 | const struct flowi6 *fl6) | |
217 | { | |
218 | return NULL; | |
219 | } | |
1b69c6d0 DA |
220 | #endif |
221 | ||
222 | #endif /* _NET_L3MDEV_H_ */ |