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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 | /** | |
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 | ||
22 | struct l3mdev_ops { | |
23 | u32 (*l3mdev_fib_table)(const struct net_device *dev); | |
24 | struct rtable * (*l3mdev_get_rtable)(const struct net_device *dev, | |
25 | const struct flowi4 *fl4); | |
26 | }; | |
27 | ||
28 | #ifdef CONFIG_NET_L3_MASTER_DEV | |
29 | ||
30 | int l3mdev_master_ifindex_rcu(struct net_device *dev); | |
31 | static inline int l3mdev_master_ifindex(struct net_device *dev) | |
32 | { | |
33 | int ifindex; | |
34 | ||
35 | rcu_read_lock(); | |
36 | ifindex = l3mdev_master_ifindex_rcu(dev); | |
37 | rcu_read_unlock(); | |
38 | ||
39 | return ifindex; | |
40 | } | |
41 | ||
42 | /* get index of an interface to use for FIB lookups. For devices | |
43 | * enslaved to an L3 master device FIB lookups are based on the | |
44 | * master index | |
45 | */ | |
46 | static inline int l3mdev_fib_oif_rcu(struct net_device *dev) | |
47 | { | |
48 | return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex; | |
49 | } | |
50 | ||
51 | static inline int l3mdev_fib_oif(struct net_device *dev) | |
52 | { | |
53 | int oif; | |
54 | ||
55 | rcu_read_lock(); | |
56 | oif = l3mdev_fib_oif_rcu(dev); | |
57 | rcu_read_unlock(); | |
58 | ||
59 | return oif; | |
60 | } | |
61 | ||
62 | u32 l3mdev_fib_table_rcu(const struct net_device *dev); | |
63 | u32 l3mdev_fib_table_by_index(struct net *net, int ifindex); | |
64 | static inline u32 l3mdev_fib_table(const struct net_device *dev) | |
65 | { | |
66 | u32 tb_id; | |
67 | ||
68 | rcu_read_lock(); | |
69 | tb_id = l3mdev_fib_table_rcu(dev); | |
70 | rcu_read_unlock(); | |
71 | ||
72 | return tb_id; | |
73 | } | |
74 | ||
75 | static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev, | |
76 | const struct flowi4 *fl4) | |
77 | { | |
78 | if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable) | |
79 | return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4); | |
80 | ||
81 | return NULL; | |
82 | } | |
83 | ||
84 | #else | |
85 | ||
86 | static inline int l3mdev_master_ifindex_rcu(struct net_device *dev) | |
87 | { | |
88 | return 0; | |
89 | } | |
90 | static inline int l3mdev_master_ifindex(struct net_device *dev) | |
91 | { | |
92 | return 0; | |
93 | } | |
94 | ||
95 | static inline int l3mdev_fib_oif_rcu(struct net_device *dev) | |
96 | { | |
97 | return dev ? dev->ifindex : 0; | |
98 | } | |
99 | static inline int l3mdev_fib_oif(struct net_device *dev) | |
100 | { | |
101 | return dev ? dev->ifindex : 0; | |
102 | } | |
103 | ||
104 | static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev) | |
105 | { | |
106 | return 0; | |
107 | } | |
108 | static inline u32 l3mdev_fib_table(const struct net_device *dev) | |
109 | { | |
110 | return 0; | |
111 | } | |
112 | static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) | |
113 | { | |
114 | return 0; | |
115 | } | |
116 | ||
117 | static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev, | |
118 | const struct flowi4 *fl4) | |
119 | { | |
120 | return NULL; | |
121 | } | |
122 | ||
123 | #endif | |
124 | ||
125 | #endif /* _NET_L3MDEV_H_ */ |