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Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[mirror_ubuntu-bionic-kernel.git] / include / net / l3mdev.h
CommitLineData
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
26struct 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
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
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 */
58static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
59{
60 return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex;
61}
62
63static 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
74u32 l3mdev_fib_table_rcu(const struct net_device *dev);
75u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
76static 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
87static 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		 96static 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		 115static 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		 134static 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
143static inline
144struct 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
161static inline int l3mdev_master_ifindex_rcu(struct net_device *dev)
162{
163 return 0;
164}
165static inline int l3mdev_master_ifindex(struct net_device *dev)
166{
167 return 0;
168}
169
170static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
171{
172 return dev ? dev->ifindex : 0;
173}
174static inline int l3mdev_fib_oif(struct net_device *dev)
175{
176 return dev ? dev->ifindex : 0;
177}
178
179static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
180{
181 return 0;
182}
183static inline u32 l3mdev_fib_table(const struct net_device *dev)
184{
185 return 0;
186}
187static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
188{
189 return 0;
190}
191
192static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
193 const struct flowi4 *fl4)
194{
195 return NULL;
196}
197
9478d12d
DA		 198static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
199{
200 return false;
201}
202
8cbb512c
DA		 203static inline void l3mdev_get_saddr(struct net *net, int ifindex,
204 struct flowi4 *fl4)
205{
206}
ccf3c8c3
DA		 207
208static inline
209struct dst_entry *l3mdev_get_rt6_dst(const struct net_device *dev,
210 const struct flowi6 *fl6)
211{
212 return NULL;
213}
214static inline
215struct 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_ */
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