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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); | |
b5bdacf3 | 32 | int (*l3mdev_get_saddr)(struct net_device *dev, |
8cbb512c | 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 | ||
1a852479 DA |
54 | static 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 | ||
1b69c6d0 DA |
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 | */ | |
76 | static inline int l3mdev_fib_oif_rcu(struct net_device *dev) | |
77 | { | |
78 | return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex; | |
79 | } | |
80 | ||
81 | static 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 | ||
92 | u32 l3mdev_fib_table_rcu(const struct net_device *dev); | |
93 | u32 l3mdev_fib_table_by_index(struct net *net, int ifindex); | |
94 | static 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 | ||
105 | static 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 | ||
9478d12d DA |
114 | static 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 | ||
b5bdacf3 DA |
133 | static inline int l3mdev_get_saddr(struct net *net, int ifindex, |
134 | struct flowi4 *fl4) | |
8cbb512c DA |
135 | { |
136 | struct net_device *dev; | |
b5bdacf3 | 137 | int rc = 0; |
8cbb512c DA |
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) { | |
b5bdacf3 | 146 | rc = dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4); |
8cbb512c DA |
147 | } |
148 | ||
149 | rcu_read_unlock(); | |
150 | } | |
b5bdacf3 DA |
151 | |
152 | return rc; | |
8cbb512c DA |
153 | } |
154 | ||
ccf3c8c3 DA |
155 | static 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 | ||
164 | static inline | |
165 | struct 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 | ||
1b69c6d0 DA |
180 | #else |
181 | ||
182 | static inline int l3mdev_master_ifindex_rcu(struct net_device *dev) | |
183 | { | |
184 | return 0; | |
185 | } | |
186 | static inline int l3mdev_master_ifindex(struct net_device *dev) | |
187 | { | |
188 | return 0; | |
189 | } | |
190 | ||
1a852479 DA |
191 | static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) |
192 | { | |
193 | return 0; | |
194 | } | |
195 | ||
1b69c6d0 DA |
196 | static inline int l3mdev_fib_oif_rcu(struct net_device *dev) |
197 | { | |
198 | return dev ? dev->ifindex : 0; | |
199 | } | |
200 | static inline int l3mdev_fib_oif(struct net_device *dev) | |
201 | { | |
202 | return dev ? dev->ifindex : 0; | |
203 | } | |
204 | ||
205 | static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev) | |
206 | { | |
207 | return 0; | |
208 | } | |
209 | static inline u32 l3mdev_fib_table(const struct net_device *dev) | |
210 | { | |
211 | return 0; | |
212 | } | |
213 | static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) | |
214 | { | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev, | |
219 | const struct flowi4 *fl4) | |
220 | { | |
221 | return NULL; | |
222 | } | |
223 | ||
9478d12d DA |
224 | static inline bool netif_index_is_l3_master(struct net *net, int ifindex) |
225 | { | |
226 | return false; | |
227 | } | |
228 | ||
b5bdacf3 DA |
229 | static inline int l3mdev_get_saddr(struct net *net, int ifindex, |
230 | struct flowi4 *fl4) | |
8cbb512c | 231 | { |
b5bdacf3 | 232 | return 0; |
8cbb512c | 233 | } |
ccf3c8c3 DA |
234 | |
235 | static inline | |
236 | struct dst_entry *l3mdev_get_rt6_dst(const struct net_device *dev, | |
237 | const struct flowi6 *fl6) | |
238 | { | |
239 | return NULL; | |
240 | } | |
241 | static inline | |
242 | struct dst_entry *l3mdev_rt6_dst_by_oif(struct net *net, | |
243 | const struct flowi6 *fl6) | |
244 | { | |
245 | return NULL; | |
246 | } | |
1b69c6d0 DA |
247 | #endif |
248 | ||
249 | #endif /* _NET_L3MDEV_H_ */ |