1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * include/net/l3mdev.h - L3 master device API
4 * Copyright (c) 2015 Cumulus Networks
5 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
6 */
7 #ifndef _NET_L3MDEV_H_
8 #define _NET_L3MDEV_H_
9
10 #include <net/dst.h>
11 #include <net/fib_rules.h>
12
13 enum l3mdev_type {
14 L3MDEV_TYPE_UNSPEC,
15 L3MDEV_TYPE_VRF,
16 __L3MDEV_TYPE_MAX
17 };
18
19 #define L3MDEV_TYPE_MAX (__L3MDEV_TYPE_MAX - 1)
20
21 typedef int (*lookup_by_table_id_t)(struct net *net, u32 table_d);
22
23 /**
24 * struct l3mdev_ops - l3mdev operations
25 *
26 * @l3mdev_fib_table: Get FIB table id to use for lookups
27 *
28 * @l3mdev_l3_rcv: Hook in L3 receive path
29 *
30 * @l3mdev_l3_out: Hook in L3 output path
31 *
32 * @l3mdev_link_scope_lookup: IPv6 lookup for linklocal and mcast destinations
33 */
34
35 struct l3mdev_ops {
36 u32 (*l3mdev_fib_table)(const struct net_device *dev);
37 struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev,
38 struct sk_buff *skb, u16 proto);
39 struct sk_buff * (*l3mdev_l3_out)(struct net_device *dev,
40 struct sock *sk, struct sk_buff *skb,
41 u16 proto);
42
43 /* IPv6 ops */
44 struct dst_entry * (*l3mdev_link_scope_lookup)(const struct net_device *dev,
45 struct flowi6 *fl6);
46 };
47
48 #ifdef CONFIG_NET_L3_MASTER_DEV
49
50 int l3mdev_table_lookup_register(enum l3mdev_type l3type,
51 lookup_by_table_id_t fn);
52
53 void l3mdev_table_lookup_unregister(enum l3mdev_type l3type,
54 lookup_by_table_id_t fn);
55
56 int l3mdev_ifindex_lookup_by_table_id(enum l3mdev_type l3type, struct net *net,
57 u32 table_id);
58
59 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
60 struct fib_lookup_arg *arg);
61
62 void l3mdev_update_flow(struct net *net, struct flowi *fl);
63
64 int l3mdev_master_ifindex_rcu(const struct net_device *dev);
65 static inline int l3mdev_master_ifindex(struct net_device *dev)
66 {
67 int ifindex;
68
69 rcu_read_lock();
70 ifindex = l3mdev_master_ifindex_rcu(dev);
71 rcu_read_unlock();
72
73 return ifindex;
74 }
75
76 static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
77 {
78 struct net_device *dev;
79 int rc = 0;
80
81 if (likely(ifindex)) {
82 rcu_read_lock();
83
84 dev = dev_get_by_index_rcu(net, ifindex);
85 if (dev)
86 rc = l3mdev_master_ifindex_rcu(dev);
87
88 rcu_read_unlock();
89 }
90
91 return rc;
92 }
93
94 static inline
95 struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev)
96 {
97 /* netdev_master_upper_dev_get_rcu calls
98 * list_first_or_null_rcu to walk the upper dev list.
99 * list_first_or_null_rcu does not handle a const arg. We aren't
100 * making changes, just want the master device from that list so
101 * typecast to remove the const
102 */
103 struct net_device *dev = (struct net_device *)_dev;
104 struct net_device *master;
105
106 if (!dev)
107 return NULL;
108
109 if (netif_is_l3_master(dev))
110 master = dev;
111 else if (netif_is_l3_slave(dev))
112 master = netdev_master_upper_dev_get_rcu(dev);
113 else
114 master = NULL;
115
116 return master;
117 }
118
119 int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex);
120 static inline
121 int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex)
122 {
123 rcu_read_lock();
124 ifindex = l3mdev_master_upper_ifindex_by_index_rcu(net, ifindex);
125 rcu_read_unlock();
126
127 return ifindex;
128 }
129
130 u32 l3mdev_fib_table_rcu(const struct net_device *dev);
131 u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
132 static inline u32 l3mdev_fib_table(const struct net_device *dev)
133 {
134 u32 tb_id;
135
136 rcu_read_lock();
137 tb_id = l3mdev_fib_table_rcu(dev);
138 rcu_read_unlock();
139
140 return tb_id;
141 }
142
143 static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
144 {
145 struct net_device *dev;
146 bool rc = false;
147
148 if (ifindex == 0)
149 return false;
150
151 rcu_read_lock();
152
153 dev = dev_get_by_index_rcu(net, ifindex);
154 if (dev)
155 rc = netif_is_l3_master(dev);
156
157 rcu_read_unlock();
158
159 return rc;
160 }
161
162 struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6);
163
164 static inline
165 struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto)
166 {
167 struct net_device *master = NULL;
168
169 if (netif_is_l3_slave(skb->dev))
170 master = netdev_master_upper_dev_get_rcu(skb->dev);
171 else if (netif_is_l3_master(skb->dev) ||
172 netif_has_l3_rx_handler(skb->dev))
173 master = skb->dev;
174
175 if (master && master->l3mdev_ops->l3mdev_l3_rcv)
176 skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto);
177
178 return skb;
179 }
180
181 static inline
182 struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
183 {
184 return l3mdev_l3_rcv(skb, AF_INET);
185 }
186
187 static inline
188 struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
189 {
190 return l3mdev_l3_rcv(skb, AF_INET6);
191 }
192
193 static inline
194 struct sk_buff *l3mdev_l3_out(struct sock *sk, struct sk_buff *skb, u16 proto)
195 {
196 struct net_device *dev = skb_dst(skb)->dev;
197
198 if (netif_is_l3_slave(dev)) {
199 struct net_device *master;
200
201 master = netdev_master_upper_dev_get_rcu(dev);
202 if (master && master->l3mdev_ops->l3mdev_l3_out)
203 skb = master->l3mdev_ops->l3mdev_l3_out(master, sk,
204 skb, proto);
205 }
206
207 return skb;
208 }
209
210 static inline
211 struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
212 {
213 return l3mdev_l3_out(sk, skb, AF_INET);
214 }
215
216 static inline
217 struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
218 {
219 return l3mdev_l3_out(sk, skb, AF_INET6);
220 }
221 #else
222
223 static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev)
224 {
225 return 0;
226 }
227 static inline int l3mdev_master_ifindex(struct net_device *dev)
228 {
229 return 0;
230 }
231
232 static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
233 {
234 return 0;
235 }
236
237 static inline
238 int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex)
239 {
240 return 0;
241 }
242 static inline
243 int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex)
244 {
245 return 0;
246 }
247
248 static inline
249 struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev)
250 {
251 return NULL;
252 }
253
254 static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
255 {
256 return 0;
257 }
258 static inline u32 l3mdev_fib_table(const struct net_device *dev)
259 {
260 return 0;
261 }
262 static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
263 {
264 return 0;
265 }
266
267 static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
268 {
269 return false;
270 }
271
272 static inline
273 struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6)
274 {
275 return NULL;
276 }
277
278 static inline
279 struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
280 {
281 return skb;
282 }
283
284 static inline
285 struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
286 {
287 return skb;
288 }
289
290 static inline
291 struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
292 {
293 return skb;
294 }
295
296 static inline
297 struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
298 {
299 return skb;
300 }
301
302 static inline
303 int l3mdev_table_lookup_register(enum l3mdev_type l3type,
304 lookup_by_table_id_t fn)
305 {
306 return -EOPNOTSUPP;
307 }
308
309 static inline
310 void l3mdev_table_lookup_unregister(enum l3mdev_type l3type,
311 lookup_by_table_id_t fn)
312 {
313 }
314
315 static inline
316 int l3mdev_ifindex_lookup_by_table_id(enum l3mdev_type l3type, struct net *net,
317 u32 table_id)
318 {
319 return -ENODEV;
320 }
321
322 static inline
323 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
324 struct fib_lookup_arg *arg)
325 {
326 return 1;
327 }
328 static inline
329 void l3mdev_update_flow(struct net *net, struct flowi *fl)
330 {
331 }
332 #endif
333
334 #endif /* _NET_L3MDEV_H_ */
335
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