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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 | ||
96c63fa7 DA |
14 | #include <net/fib_rules.h> |
15 | ||
1b69c6d0 DA |
16 | /** |
17 | * struct l3mdev_ops - l3mdev operations | |
18 | * | |
19 | * @l3mdev_fib_table: Get FIB table id to use for lookups | |
20 | * | |
21 | * @l3mdev_get_rtable: Get cached IPv4 rtable (dst_entry) for device | |
8cbb512c DA |
22 | * |
23 | * @l3mdev_get_saddr: Get source address for a flow | |
ccf3c8c3 DA |
24 | * |
25 | * @l3mdev_get_rt6_dst: Get cached IPv6 rt6_info (dst_entry) for device | |
1b69c6d0 DA |
26 | */ |
27 | ||
28 | struct l3mdev_ops { | |
29 | u32 (*l3mdev_fib_table)(const struct net_device *dev); | |
74b20582 DA |
30 | struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev, |
31 | struct sk_buff *skb, u16 proto); | |
ccf3c8c3 DA |
32 | |
33 | /* IPv4 ops */ | |
1b69c6d0 DA |
34 | struct rtable * (*l3mdev_get_rtable)(const struct net_device *dev, |
35 | const struct flowi4 *fl4); | |
b5bdacf3 | 36 | int (*l3mdev_get_saddr)(struct net_device *dev, |
8cbb512c | 37 | struct flowi4 *fl4); |
ccf3c8c3 DA |
38 | |
39 | /* IPv6 ops */ | |
40 | struct dst_entry * (*l3mdev_get_rt6_dst)(const struct net_device *dev, | |
cd2a9e62 | 41 | struct flowi6 *fl6); |
0d240e78 DA |
42 | int (*l3mdev_get_saddr6)(struct net_device *dev, |
43 | const struct sock *sk, | |
44 | struct flowi6 *fl6); | |
1b69c6d0 DA |
45 | }; |
46 | ||
47 | #ifdef CONFIG_NET_L3_MASTER_DEV | |
48 | ||
96c63fa7 DA |
49 | int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, |
50 | struct fib_lookup_arg *arg); | |
51 | ||
3f2fb9a8 | 52 | int l3mdev_master_ifindex_rcu(const struct net_device *dev); |
1b69c6d0 DA |
53 | static inline int l3mdev_master_ifindex(struct net_device *dev) |
54 | { | |
55 | int ifindex; | |
56 | ||
57 | rcu_read_lock(); | |
58 | ifindex = l3mdev_master_ifindex_rcu(dev); | |
59 | rcu_read_unlock(); | |
60 | ||
61 | return ifindex; | |
62 | } | |
63 | ||
1a852479 DA |
64 | static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) |
65 | { | |
66 | struct net_device *dev; | |
67 | int rc = 0; | |
68 | ||
69 | if (likely(ifindex)) { | |
70 | rcu_read_lock(); | |
71 | ||
72 | dev = dev_get_by_index_rcu(net, ifindex); | |
73 | if (dev) | |
74 | rc = l3mdev_master_ifindex_rcu(dev); | |
75 | ||
76 | rcu_read_unlock(); | |
77 | } | |
78 | ||
79 | return rc; | |
80 | } | |
81 | ||
afbac601 DA |
82 | static inline |
83 | const struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev) | |
84 | { | |
85 | /* netdev_master_upper_dev_get_rcu calls | |
86 | * list_first_or_null_rcu to walk the upper dev list. | |
87 | * list_first_or_null_rcu does not handle a const arg. We aren't | |
88 | * making changes, just want the master device from that list so | |
89 | * typecast to remove the const | |
90 | */ | |
91 | struct net_device *dev = (struct net_device *)_dev; | |
92 | const struct net_device *master; | |
93 | ||
94 | if (!dev) | |
95 | return NULL; | |
96 | ||
97 | if (netif_is_l3_master(dev)) | |
98 | master = dev; | |
99 | else if (netif_is_l3_slave(dev)) | |
100 | master = netdev_master_upper_dev_get_rcu(dev); | |
101 | else | |
102 | master = NULL; | |
103 | ||
104 | return master; | |
105 | } | |
106 | ||
1b69c6d0 DA |
107 | /* get index of an interface to use for FIB lookups. For devices |
108 | * enslaved to an L3 master device FIB lookups are based on the | |
109 | * master index | |
110 | */ | |
111 | static inline int l3mdev_fib_oif_rcu(struct net_device *dev) | |
112 | { | |
113 | return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex; | |
114 | } | |
115 | ||
116 | static inline int l3mdev_fib_oif(struct net_device *dev) | |
117 | { | |
118 | int oif; | |
119 | ||
120 | rcu_read_lock(); | |
121 | oif = l3mdev_fib_oif_rcu(dev); | |
122 | rcu_read_unlock(); | |
123 | ||
124 | return oif; | |
125 | } | |
126 | ||
127 | u32 l3mdev_fib_table_rcu(const struct net_device *dev); | |
128 | u32 l3mdev_fib_table_by_index(struct net *net, int ifindex); | |
129 | static inline u32 l3mdev_fib_table(const struct net_device *dev) | |
130 | { | |
131 | u32 tb_id; | |
132 | ||
133 | rcu_read_lock(); | |
134 | tb_id = l3mdev_fib_table_rcu(dev); | |
135 | rcu_read_unlock(); | |
136 | ||
137 | return tb_id; | |
138 | } | |
139 | ||
140 | static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev, | |
141 | const struct flowi4 *fl4) | |
142 | { | |
143 | if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable) | |
144 | return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4); | |
145 | ||
146 | return NULL; | |
147 | } | |
148 | ||
9478d12d DA |
149 | static inline bool netif_index_is_l3_master(struct net *net, int ifindex) |
150 | { | |
151 | struct net_device *dev; | |
152 | bool rc = false; | |
153 | ||
154 | if (ifindex == 0) | |
155 | return false; | |
156 | ||
157 | rcu_read_lock(); | |
158 | ||
159 | dev = dev_get_by_index_rcu(net, ifindex); | |
160 | if (dev) | |
161 | rc = netif_is_l3_master(dev); | |
162 | ||
163 | rcu_read_unlock(); | |
164 | ||
165 | return rc; | |
166 | } | |
167 | ||
4a65896f | 168 | int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4); |
8cbb512c | 169 | |
cd2a9e62 | 170 | struct dst_entry *l3mdev_get_rt6_dst(struct net *net, struct flowi6 *fl6); |
0d240e78 DA |
171 | int l3mdev_get_saddr6(struct net *net, const struct sock *sk, |
172 | struct flowi6 *fl6); | |
ccf3c8c3 | 173 | |
74b20582 DA |
174 | static inline |
175 | struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto) | |
176 | { | |
177 | struct net_device *master = NULL; | |
178 | ||
179 | if (netif_is_l3_slave(skb->dev)) | |
180 | master = netdev_master_upper_dev_get_rcu(skb->dev); | |
181 | else if (netif_is_l3_master(skb->dev)) | |
182 | master = skb->dev; | |
183 | ||
184 | if (master && master->l3mdev_ops->l3mdev_l3_rcv) | |
185 | skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto); | |
186 | ||
187 | return skb; | |
188 | } | |
189 | ||
190 | static inline | |
191 | struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) | |
192 | { | |
193 | return l3mdev_l3_rcv(skb, AF_INET); | |
194 | } | |
195 | ||
196 | static inline | |
197 | struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) | |
198 | { | |
199 | return l3mdev_l3_rcv(skb, AF_INET6); | |
200 | } | |
201 | ||
1b69c6d0 DA |
202 | #else |
203 | ||
3f2fb9a8 | 204 | static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev) |
1b69c6d0 DA |
205 | { |
206 | return 0; | |
207 | } | |
208 | static inline int l3mdev_master_ifindex(struct net_device *dev) | |
209 | { | |
210 | return 0; | |
211 | } | |
212 | ||
1a852479 DA |
213 | static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) |
214 | { | |
215 | return 0; | |
216 | } | |
217 | ||
afbac601 DA |
218 | static inline |
219 | const struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev) | |
220 | { | |
221 | return NULL; | |
222 | } | |
223 | ||
1b69c6d0 DA |
224 | static inline int l3mdev_fib_oif_rcu(struct net_device *dev) |
225 | { | |
226 | return dev ? dev->ifindex : 0; | |
227 | } | |
228 | static inline int l3mdev_fib_oif(struct net_device *dev) | |
229 | { | |
230 | return dev ? dev->ifindex : 0; | |
231 | } | |
232 | ||
233 | static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev) | |
234 | { | |
235 | return 0; | |
236 | } | |
237 | static inline u32 l3mdev_fib_table(const struct net_device *dev) | |
238 | { | |
239 | return 0; | |
240 | } | |
241 | static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) | |
242 | { | |
243 | return 0; | |
244 | } | |
245 | ||
246 | static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev, | |
247 | const struct flowi4 *fl4) | |
248 | { | |
249 | return NULL; | |
250 | } | |
251 | ||
9478d12d DA |
252 | static inline bool netif_index_is_l3_master(struct net *net, int ifindex) |
253 | { | |
254 | return false; | |
255 | } | |
256 | ||
b5bdacf3 DA |
257 | static inline int l3mdev_get_saddr(struct net *net, int ifindex, |
258 | struct flowi4 *fl4) | |
8cbb512c | 259 | { |
b5bdacf3 | 260 | return 0; |
8cbb512c | 261 | } |
ccf3c8c3 DA |
262 | |
263 | static inline | |
cd2a9e62 | 264 | struct dst_entry *l3mdev_get_rt6_dst(struct net *net, struct flowi6 *fl6) |
ccf3c8c3 DA |
265 | { |
266 | return NULL; | |
267 | } | |
74b20582 | 268 | |
0d240e78 DA |
269 | static inline int l3mdev_get_saddr6(struct net *net, const struct sock *sk, |
270 | struct flowi6 *fl6) | |
271 | { | |
272 | return 0; | |
273 | } | |
274 | ||
74b20582 DA |
275 | static inline |
276 | struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) | |
277 | { | |
278 | return skb; | |
279 | } | |
280 | ||
281 | static inline | |
282 | struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) | |
283 | { | |
284 | return skb; | |
285 | } | |
96c63fa7 DA |
286 | |
287 | static inline | |
288 | int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, | |
289 | struct fib_lookup_arg *arg) | |
290 | { | |
291 | return 1; | |
292 | } | |
1b69c6d0 DA |
293 | #endif |
294 | ||
295 | #endif /* _NET_L3MDEV_H_ */ |