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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 | ||
a8e3e1a9 | 14 | #include <net/dst.h> |
96c63fa7 DA |
15 | #include <net/fib_rules.h> |
16 | ||
1b69c6d0 DA |
17 | /** |
18 | * struct l3mdev_ops - l3mdev operations | |
19 | * | |
20 | * @l3mdev_fib_table: Get FIB table id to use for lookups | |
21 | * | |
a8e3e1a9 DA |
22 | * @l3mdev_l3_rcv: Hook in L3 receive path |
23 | * | |
24 | * @l3mdev_l3_out: Hook in L3 output path | |
25 | * | |
4c1feac5 | 26 | * @l3mdev_link_scope_lookup: IPv6 lookup for linklocal and mcast destinations |
1b69c6d0 DA |
27 | */ |
28 | ||
29 | struct l3mdev_ops { | |
30 | u32 (*l3mdev_fib_table)(const struct net_device *dev); | |
74b20582 DA |
31 | struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev, |
32 | struct sk_buff *skb, u16 proto); | |
a8e3e1a9 DA |
33 | struct sk_buff * (*l3mdev_l3_out)(struct net_device *dev, |
34 | struct sock *sk, struct sk_buff *skb, | |
35 | u16 proto); | |
ccf3c8c3 | 36 | |
ccf3c8c3 | 37 | /* IPv6 ops */ |
4c1feac5 | 38 | struct dst_entry * (*l3mdev_link_scope_lookup)(const struct net_device *dev, |
cd2a9e62 | 39 | struct flowi6 *fl6); |
1b69c6d0 DA |
40 | }; |
41 | ||
42 | #ifdef CONFIG_NET_L3_MASTER_DEV | |
43 | ||
96c63fa7 DA |
44 | int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, |
45 | struct fib_lookup_arg *arg); | |
46 | ||
9ee0034b DA |
47 | void l3mdev_update_flow(struct net *net, struct flowi *fl); |
48 | ||
3f2fb9a8 | 49 | int l3mdev_master_ifindex_rcu(const struct net_device *dev); |
1b69c6d0 DA |
50 | static inline int l3mdev_master_ifindex(struct net_device *dev) |
51 | { | |
52 | int ifindex; | |
53 | ||
54 | rcu_read_lock(); | |
55 | ifindex = l3mdev_master_ifindex_rcu(dev); | |
56 | rcu_read_unlock(); | |
57 | ||
58 | return ifindex; | |
59 | } | |
60 | ||
1a852479 DA |
61 | static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) |
62 | { | |
63 | struct net_device *dev; | |
64 | int rc = 0; | |
65 | ||
66 | if (likely(ifindex)) { | |
67 | rcu_read_lock(); | |
68 | ||
69 | dev = dev_get_by_index_rcu(net, ifindex); | |
70 | if (dev) | |
71 | rc = l3mdev_master_ifindex_rcu(dev); | |
72 | ||
73 | rcu_read_unlock(); | |
74 | } | |
75 | ||
76 | return rc; | |
77 | } | |
78 | ||
afbac601 | 79 | static inline |
5f02ce24 | 80 | struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev) |
afbac601 DA |
81 | { |
82 | /* netdev_master_upper_dev_get_rcu calls | |
83 | * list_first_or_null_rcu to walk the upper dev list. | |
84 | * list_first_or_null_rcu does not handle a const arg. We aren't | |
85 | * making changes, just want the master device from that list so | |
86 | * typecast to remove the const | |
87 | */ | |
88 | struct net_device *dev = (struct net_device *)_dev; | |
5f02ce24 | 89 | struct net_device *master; |
afbac601 DA |
90 | |
91 | if (!dev) | |
92 | return NULL; | |
93 | ||
94 | if (netif_is_l3_master(dev)) | |
95 | master = dev; | |
96 | else if (netif_is_l3_slave(dev)) | |
97 | master = netdev_master_upper_dev_get_rcu(dev); | |
98 | else | |
99 | master = NULL; | |
100 | ||
101 | return master; | |
102 | } | |
103 | ||
6a6d6681 AB |
104 | int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex); |
105 | static inline | |
106 | int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex) | |
107 | { | |
108 | rcu_read_lock(); | |
109 | ifindex = l3mdev_master_upper_ifindex_by_index_rcu(net, ifindex); | |
110 | rcu_read_unlock(); | |
111 | ||
112 | return ifindex; | |
113 | } | |
114 | ||
1b69c6d0 DA |
115 | u32 l3mdev_fib_table_rcu(const struct net_device *dev); |
116 | u32 l3mdev_fib_table_by_index(struct net *net, int ifindex); | |
117 | static inline u32 l3mdev_fib_table(const struct net_device *dev) | |
118 | { | |
119 | u32 tb_id; | |
120 | ||
121 | rcu_read_lock(); | |
122 | tb_id = l3mdev_fib_table_rcu(dev); | |
123 | rcu_read_unlock(); | |
124 | ||
125 | return tb_id; | |
126 | } | |
127 | ||
6104e112 DA |
128 | static inline bool netif_index_is_l3_master(struct net *net, int ifindex) |
129 | { | |
130 | struct net_device *dev; | |
131 | bool rc = false; | |
132 | ||
133 | if (ifindex == 0) | |
134 | return false; | |
135 | ||
136 | rcu_read_lock(); | |
137 | ||
138 | dev = dev_get_by_index_rcu(net, ifindex); | |
139 | if (dev) | |
140 | rc = netif_is_l3_master(dev); | |
141 | ||
142 | rcu_read_unlock(); | |
143 | ||
144 | return rc; | |
145 | } | |
146 | ||
4c1feac5 | 147 | struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6); |
ccf3c8c3 | 148 | |
74b20582 DA |
149 | static inline |
150 | struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto) | |
151 | { | |
152 | struct net_device *master = NULL; | |
153 | ||
154 | if (netif_is_l3_slave(skb->dev)) | |
155 | master = netdev_master_upper_dev_get_rcu(skb->dev); | |
d5256083 DB |
156 | else if (netif_is_l3_master(skb->dev) || |
157 | netif_has_l3_rx_handler(skb->dev)) | |
74b20582 DA |
158 | master = skb->dev; |
159 | ||
160 | if (master && master->l3mdev_ops->l3mdev_l3_rcv) | |
161 | skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto); | |
162 | ||
163 | return skb; | |
164 | } | |
165 | ||
166 | static inline | |
167 | struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) | |
168 | { | |
169 | return l3mdev_l3_rcv(skb, AF_INET); | |
170 | } | |
171 | ||
172 | static inline | |
173 | struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) | |
174 | { | |
175 | return l3mdev_l3_rcv(skb, AF_INET6); | |
176 | } | |
177 | ||
a8e3e1a9 DA |
178 | static inline |
179 | struct sk_buff *l3mdev_l3_out(struct sock *sk, struct sk_buff *skb, u16 proto) | |
180 | { | |
181 | struct net_device *dev = skb_dst(skb)->dev; | |
182 | ||
183 | if (netif_is_l3_slave(dev)) { | |
184 | struct net_device *master; | |
185 | ||
186 | master = netdev_master_upper_dev_get_rcu(dev); | |
187 | if (master && master->l3mdev_ops->l3mdev_l3_out) | |
188 | skb = master->l3mdev_ops->l3mdev_l3_out(master, sk, | |
189 | skb, proto); | |
190 | } | |
191 | ||
192 | return skb; | |
193 | } | |
194 | ||
195 | static inline | |
196 | struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb) | |
197 | { | |
198 | return l3mdev_l3_out(sk, skb, AF_INET); | |
199 | } | |
200 | ||
201 | static inline | |
202 | struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb) | |
203 | { | |
204 | return l3mdev_l3_out(sk, skb, AF_INET6); | |
205 | } | |
1b69c6d0 DA |
206 | #else |
207 | ||
3f2fb9a8 | 208 | static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev) |
1b69c6d0 DA |
209 | { |
210 | return 0; | |
211 | } | |
212 | static inline int l3mdev_master_ifindex(struct net_device *dev) | |
213 | { | |
214 | return 0; | |
215 | } | |
216 | ||
1a852479 DA |
217 | static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) |
218 | { | |
219 | return 0; | |
220 | } | |
221 | ||
6a6d6681 AB |
222 | static inline |
223 | int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex) | |
224 | { | |
225 | return 0; | |
226 | } | |
227 | static inline | |
228 | int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex) | |
229 | { | |
230 | return 0; | |
231 | } | |
232 | ||
afbac601 | 233 | static inline |
5f02ce24 | 234 | struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev) |
afbac601 DA |
235 | { |
236 | return NULL; | |
237 | } | |
238 | ||
1b69c6d0 DA |
239 | static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev) |
240 | { | |
241 | return 0; | |
242 | } | |
243 | static inline u32 l3mdev_fib_table(const struct net_device *dev) | |
244 | { | |
245 | return 0; | |
246 | } | |
247 | static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) | |
248 | { | |
249 | return 0; | |
250 | } | |
251 | ||
6104e112 DA |
252 | static inline bool netif_index_is_l3_master(struct net *net, int ifindex) |
253 | { | |
254 | return false; | |
255 | } | |
256 | ||
ccf3c8c3 | 257 | static inline |
4c1feac5 | 258 | struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6) |
ccf3c8c3 DA |
259 | { |
260 | return NULL; | |
261 | } | |
74b20582 DA |
262 | |
263 | static inline | |
264 | struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) | |
265 | { | |
266 | return skb; | |
267 | } | |
268 | ||
269 | static inline | |
270 | struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) | |
271 | { | |
272 | return skb; | |
273 | } | |
96c63fa7 | 274 | |
a8e3e1a9 DA |
275 | static inline |
276 | struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb) | |
277 | { | |
278 | return skb; | |
279 | } | |
280 | ||
281 | static inline | |
282 | struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb) | |
283 | { | |
284 | return skb; | |
285 | } | |
286 | ||
96c63fa7 DA |
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 | } | |
9ee0034b DA |
293 | static inline |
294 | void l3mdev_update_flow(struct net *net, struct flowi *fl) | |
295 | { | |
296 | } | |
1b69c6d0 DA |
297 | #endif |
298 | ||
299 | #endif /* _NET_L3MDEV_H_ */ |